DAC104S085 www.ti.com SNAS362F - MAY 2006 - REVISED MARCH 2013 DAC104S085/DAC104S085-Q1 10-Bit Micro Power QUAD Digital-to-Analog Converter with Rail-to-Rail Output Check for Samples: DAC104S085 FEATURES DESCRIPTION * * * * * * * * * The DAC104S085 is a full-featured, general purpose QUAD 10-bit voltage-output digital-to-analog converter (DAC) that can operate from a single +2.7V to 5.5V supply and consumes 1.1 mW at 3V and 2.5 mW at 5V. The DAC104S085 is packaged in 10-lead SON and VSSOP packages. The 10-lead SON package makes the DAC104S085 the smallest QUAD DAC in its class. The on-chip output amplifier allows rail-to-rail output swing and the three wire serial interface operates at clock rates up to 40 MHz over the entire supply voltage range. Competitive devices are limited to 25 MHz clock rates at supply voltages in the 2.7V to 3.6V range. The serial interface is compatible with standard SPI, QSPI, MICROWIRE and DSP interfaces. 1 2 Ensured Monotonicity Low Power Operation Rail-to-Rail Voltage Output Power-on Reset to 0V Simultaneous Output Updating Wide power supply range (+2.7V to +5.5V) Industry's Smallest Package Power Down Modes AEC-Q100 Grade 1 Qualified APPLICATIONS * * * * * Battery-Powered Instruments Digital Gain and Offset Adjustment Programmable Voltage & Current Sources Programmable Attenuators Automotive KEY SPECIFICATIONS * * * * * * * Resolution 10 bits INL 2 LSB (max) DNL +0.35 / -0.25 LSB (max) Settling Time 6 s (max) Zero Code Error +15 mV (max) Full-Scale Error -0.75 %FS (max) Supply Power - Normal - 1.1 mW (3V) - 2.5 mW (5V) typ - Power Down - 0.3 W (3V) - 0.8 W (5V) typ The reference for the DAC104S085 serves all four channels and can vary in voltage between 1V and VA, providing the widest possible output dynamic range. The DAC104S085 has a 16-bit input shift register that controls the outputs to be updated, the mode of operation, the powerdown condition, and the binary input data. All four outputs can be updated simultaneously or individually depending on the setting of the two mode of operation bits. A power-on reset circuit ensures that the DAC output powers up to zero volts and remains there until there is a valid write to the device. A power-down feature reduces power consumption to less than a microWatt with three different termination options. The low power consumption and small packages of the DAC104S085 make it an excellent choice for use in battery operated equipment. The DAC104S085 is one of a family of pin compatible DACs, including the 8-bit DAC084S085 and the 12-bit DAC124S085. The DAC104S085 operates over the extended industrial temperature range of -40C to +125C. 1 2 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright (c) 2006-2013, Texas Instruments Incorporated DAC104S085 SNAS362F - MAY 2006 - REVISED MARCH 2013 www.ti.com Pin Configuration VA 1 VOUTA 2 VOUTB 3 VOUTC 4 VOUTD 5 VA 1 VOUTA 2 VOUTB VOUTC VOUTD 10 SCLK 9 SYNC SON 8 DIN 7 VREFIN 6 GND 10 SCLK 9 3 VSSOP 8 4 7 5 6 SYNC DIN VREFIN GND Block Diagram VREFIN DAC104S085 REF POWER-ON RESET 10 BIT DAC VOUTA BUFFER 10 2.5k 100k REF 10 BIT DAC VOUTB BUFFER 10 DAC REGISTER 2.5k 100k REF 10 BIT DAC VOUTC BUFFER 10 2.5k 100k 10 REF 10 BIT DAC VOUTD BUFFER 10 2.5k INPUT CONTROL LOGIC SYNC 2 SCLK 100k POWER-DOWN CONTROL LOGIC DIN Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: DAC104S085 DAC104S085 www.ti.com SNAS362F - MAY 2006 - REVISED MARCH 2013 PIN DESCRIPTIONS SON VSSOP Pin No. Symbol Type Description 1 VA Supply 2 VOUTA Analog Output Power supply input. Must be decoupled to GND. Channel A Analog Output Voltage. 3 VOUTB Analog Output Channel B Analog Output Voltage. 4 VOUTC Analog Output Channel C Analog Output Voltage. 5 VOUTD Analog Output Channel D Analog Output Voltage. 6 GND Ground 7 VREFIN Analog Input Unbuffered reference voltage shared by all channels. Must be decoupled to GND. 8 DIN Digital Input Serial Data Input. Data is clocked into the 16-bit shift register on the falling edges of SCLK after the fall of SYNC. Ground reference for all on-chip circuitry. 9 SYNC Digital Input Frame synchronization input for the data input. When this pin goes low, it enables the input shift register and data is transferred on the falling edges of SCLK. The DAC is updated on the 16th clock cycle unless SYNC is brought high before the 16th clock, in which case the rising edge of SYNC acts as an interrupt and the write sequence is ignored by the DAC. 10 SCLK Digital Input Serial Clock Input. Data is clocked into the input shift register on the falling edges of this pin. 11 PAD (SON only) Ground Exposed die attach pad can be connected to ground or left floating. Soldering the pad to the PCB offers optimal thermal performance and enhances package self-alignment during reflow. These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Absolute Maximum Ratings (1) (2) (3) Supply Voltage, VA 6.5V -0.3V to 6.5V Voltage on any Input Pin Input Current at Any Pin (4) 10 mA Package Input Current (4) 20 mA Power Consumption at TA = 25C See ESD Susceptibility (6) Human Body Model (5) 2500V Machine Model 250V Junction Temperature +150C Storage Temperature -65C to +150C (1) (2) (3) (4) (5) (6) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not ensure specific performance limits. For ensured specifications and test conditions, see the Electrical Characteristics. The ensured specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. Operation of the device beyond the maximum Operating Ratings is not recommended. All voltages are measured with respect to GND = 0V, unless otherwise specified. If Military/Aerospace specified devices are required, please contact the TI Sales Office/Distributors for availability and specifications. When the input voltage at any pin exceeds 5.5V or is less than GND, the current at that pin should be limited to 10 mA. The 20 mA maximum package input current rating limits the number of pins that can safely exceed the power supplies with an input current of 10 mA to two. The absolute maximum junction temperature (TJmax) for this device is 150C. The maximum allowable power dissipation is dictated by TJmax, the junction-to-ambient thermal resistance (JA), and the ambient temperature (TA), and can be calculated using the formula PDMAX = (TJmax - TA) / JA. The values for maximum power dissipation will be reached only when the device is operated in a severe fault condition (e.g., when input or output pins are driven beyond the operating ratings, or the power supply polarity is reversed). Human body model is 100 pF capacitor discharged through a 1.5 k resistor. Machine model is 220 pF discharged through ZERO Ohms. Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: DAC104S085 3 DAC104S085 SNAS362F - MAY 2006 - REVISED MARCH 2013 www.ti.com (1) (2) Operating Ratings -40C TA +125C Operating Temperature Range Supply Voltage, VA +2.7V to 5.5V Reference Voltage, VREFIN +1.0V to VA Digital Input Voltage (3) 0.0V to 5.5V Output Load 0 to 1500 pF SCLK Frequency (1) (2) (3) Up to 40 MHz Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not ensure specific performance limits. For ensured specifications and test conditions, see the Electrical Characteristics. The ensured specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. Operation of the device beyond the maximum Operating Ratings is not recommended. All voltages are measured with respect to GND = 0V, unless otherwise specified. The inputs are protected as shown below. Input voltage magnitudes up to 5.5V, regardless of VA, will not cause errors in the conversion result. For example, if VA is 3V, the digital input pins can be driven with a 5V logic device. I/O TO INTERNAL CIRCUITRY GND Package Thermal Resistances (1) Package JA 10-Lead VSSOP 240C/W 10-Lead SON 250C/W Soldering process must comply with Reflow Temperature Profile specifications. Refer to http://www.ti.com/lit/SNOA549. (1) Reflow temperature profiles are different for lead-free packages. Electrical Characteristics The following specifications apply for VA = +2.7V to +5.5V, VREFIN = VA, CL = 200 pF to GND, fSCLK = 30 MHz, input code range 12 to 1011. Boldface limits apply for TMIN TA TMAX and all other limits are at TA = 25C, unless otherwise specified. Limits (1) Units (Limits) Resolution 10 Bits (min) Monotonicity 10 Bits (min) 0.7 2 LSB (max) +0.08 +0.35 LSB (max) LSB (min) Symbol Parameter Conditions Typical (1) STATIC PERFORMANCE INL Integral Non-Linearity DNL Differential Non-Linearity VA = 2.7V to 5.5V -0.03 -0.25 ZE Zero Code Error IOUT = 0 +5 +15 mV (max) FSE Full-Scale Error IOUT = 0 -0.1 -0.75 %FSR (max) GE Gain Error All ones Loaded to DAC register -0.2 -1.0 %FSR ZCED TC GE (1) 4 -20 V/C VA = 3V -0.7 ppm/C VA = 5V -1.0 ppm/C Zero Code Error Drift Gain Error Tempco Typical figures are at TJ = 25C, and represent most likely parametric norms. Test limits are specified to TI's AOQL (Average Outgoing Quality Level). Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: DAC104S085 DAC104S085 www.ti.com SNAS362F - MAY 2006 - REVISED MARCH 2013 Electrical Characteristics (continued) The following specifications apply for VA = +2.7V to +5.5V, VREFIN = VA, CL = 200 pF to GND, fSCLK = 30 MHz, input code range 12 to 1011. Boldface limits apply for TMIN TA TMAX and all other limits are at TA = 25C, unless otherwise specified. Symbol Parameter Conditions Typical (1) Limits (1) Units (Limits) 0 VREFIN V (min) V (max) 1 A (max) OUTPUT CHARACTERISTICS Output Voltage Range IOZ ZCO FSO IOS IOS (2) High-Impedance Output Leakage Current (2) Zero Code Output Full Scale Output Output Short Circuit Current (source) Output Short Circuit Current (sink) IO Continuous Output Current (2) CL Maximum Load Capacitance ZOUT See VA = 3V, IOUT = 200 A 1.3 mV VA = 3V, IOUT = 1 mA 6.0 mV VA = 5V, IOUT = 200 A 7.0 mV VA = 5V, IOUT = 1 mA 10.0 mV VA = 3V, IOUT = 200 A 2.984 V VA = 3V, IOUT = 1 mA 2.934 V VA = 5V, IOUT = 200 A 4.989 V VA = 5V, IOUT = 1 mA 4.958 V VA = 3V, VOUT = 0V, Input Code = 3FFh -56 mA VA = 5V, VOUT = 0V, Input Code = 3FFh -69 mA VA = 3V, VOUT = 3V, Input Code = 000h 52 mA VA = 5V, VOUT = 5V, Input Code = 000h 75 mA Available on each DAC output 11 mA (max) RL = 1500 pF RL = 2k 1500 pF 7.5 DC Output Impedance REFERENCE INPUT CHARACTERISTICS Input Range Minimum VREFIN 0.2 Input Range Maximum Input Impedance 1.0 V (min) VA V (max) 30 k LOGIC INPUT CHARACTERISTICS IIN Input Current (2) VIL Input Low Voltage (2) 1 A (max) VA = 3V 0.9 0.6 V (max) VA = 5V 1.5 0.8 V (max) VA = 3V 1.4 2.1 V (min) VA = 5V 2.1 2.4 V (min) 3 pF (max) Supply Voltage Minimum 2.7 V (min) Supply Voltage Maximum 5.5 V (max) VIH Input High Voltage (2) CIN (2) Input Capacitance POWER REQUIREMENTS VA (3) (2) (3) This parameter is ensured by design and/or characterization and is not tested in production. To ensure accuracy, it is required that VA and VREFIN be well bypassed. Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: DAC104S085 5 DAC104S085 SNAS362F - MAY 2006 - REVISED MARCH 2013 www.ti.com Electrical Characteristics (continued) The following specifications apply for VA = +2.7V to +5.5V, VREFIN = VA, CL = 200 pF to GND, fSCLK = 30 MHz, input code range 12 to 1011. Boldface limits apply for TMIN TA TMAX and all other limits are at TA = 25C, unless otherwise specified. Symbol Parameter fSCLK = 30 MHz Normal Supply Current (output unloaded) IN fSCLK = 0 IPD Power Down Supply Current (output unloaded, SYNC = DIN = 0V after PD mode loaded) All PD Modes, (2) fSCLK = 30 MHz Normal Supply Power (output unloaded) PN fSCLK = 0 PPD Power Down Supply Power (output unloaded, SYNC = DIN = 0V after PD mode loaded) Typical (1) Limits (1) Units (Limits) VA = 2.7V to 3.6V 350 485 A (max) VA = 4.5V to 5.5V 500 650 A (max) VA = 2.7V to 3.6V 330 A VA = 4.5V to 5.5V 460 A VA = 2.7V to 3.6V 0.10 1.0 A (max) VA = 4.5V to 5.5V 0.15 1.0 A (max) VA = 2.7V to 3.6V 1.1 1.7 mW (max) VA = 4.5V to 5.5V 2.5 3.6 mW (max) VA = 2.7V to 3.6V 1.0 mW VA = 4.5V to 5.5V 2.3 mW VA = 2.7V to 3.6V 0.3 3.6 W (max) VA = 4.5V to 5.5V 0.8 5.5 W (max) Conditions All PD Modes, (2) A.C. and Timing Characteristics Values shown in this table are design targets and are subject to change before product release. The following specifications apply for VA = +2.7V to +5.5V, VREFIN = VA, CL = 200 pF to GND, fSCLK = 30 MHz, input code range 12 to 1011. Boldface limits apply for TMIN TA TMAX and all other limits are at TA = 25C, unless otherwise specified. Symbol fSCLK Parameter Conductions SCLK Frequency Typical (1) Limits (1) Units (Limits) 40 30 MHz (max) 100h to 300h code change RL = 2 k, CL = 200 pF 4.5 6 s (max) 1 V/s Code change from 200h to 1FFh 12 nV-sec 0.5 nV-sec Digital Crosstalk 1 nV-sec DAC-to-DAC Crosstalk 3 nV-sec ts Output Voltage Settling Time (2) SR Output Slew Rate Glitch Impulse Digital Feedthrough Multiplying Bandwidth VREFIN = 2.5V 0.1Vpp 160 kHz Total Harmonic Distortion VREFIN = 2.5V 0.1Vpp input frequency = 10kHz 70 dB VA = 3V 6 sec VA = 5V 39 sec tWU Wake-Up Time 1/fSCLK SCLK Cycle Time 25 33 ns (min) tCH SCLK High time 7 10 ns (min) (1) (2) 6 Typical figures are at TJ = 25C, and represent most likely parametric norms. Test limits are specified to TI's AOQL (Average Outgoing Quality Level). This parameter is ensured by design and/or characterization and is not tested in production. Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: DAC104S085 DAC104S085 www.ti.com SNAS362F - MAY 2006 - REVISED MARCH 2013 A.C. and Timing Characteristics (continued) Values shown in this table are design targets and are subject to change before product release. The following specifications apply for VA = +2.7V to +5.5V, VREFIN = VA, CL = 200 pF to GND, fSCLK = 30 MHz, input code range 12 to 1011. Boldface limits apply for TMIN TA TMAX and all other limits are at TA = 25C, unless otherwise specified. Symbol Parameter Conductions Typical (1) Limits (1) Units (Limits) tCL SCLK Low Time 7 10 ns (min) tSS SYNC Set-up Time prior to SCLK Falling Edge 4 10 ns (min) tDS Data Set-Up Time prior to SCLK Falling Edge 1.5 3.5 ns (min) tDH Data Hold Time after SCLK Falling Edge 1.5 3.5 ns (min) tCFSR SCLK fall prior to rise of SYNC 0 3 ns (min) tSYNC SYNC High Time 6 10 ns (min) Specification Definitions DIFFERENTIAL NON-LINEARITY (DNL) is the measure of the maximum deviation from the ideal step size of 1 LSB, which is VREF / 1024 = VA / 1024. DAC-to-DAC CROSSTALK is the glitch impulse transferred to a DAC output in response to a full-scale change in the output of another DAC. DIGITAL CROSSTALK is the glitch impulse transferred to a DAC output at mid-scale in response to a full-scale change in the input register of another DAC. DIGITAL FEEDTHROUGH is a measure of the energy injected into the analog output of the DAC from the digital inputs when the DAC outputs are not updated. It is measured with a full-scale code change on the data bus. FULL-SCALE ERROR is the difference between the actual output voltage with a full scale code (3FFh) loaded into the DAC and the value of VA x 1023 / 1024. GAIN ERROR is the deviation from the ideal slope of the transfer function. It can be calculated from Zero and Full-Scale Errors as GE = FSE - ZE, where GE is Gain error, FSE is Full-Scale Error and ZE is Zero Error. GLITCH IMPULSE is the energy injected into the analog output when the input code to the DAC register changes. It is specified as the area of the glitch in nanovolt-seconds. INTEGRAL NON-LINEARITY (INL) is a measure of the deviation of each individual code from a straight line through the input to output transfer function. The deviation of any given code from this straight line is measured from the center of that code value. The end point method is used. INL for this product is specified over a limited range, per the Electrical Tables. LEAST SIGNIFICANT BIT (LSB) is the bit that has the smallest value or weight of all bits in a word. This value is LSB = VREF / 2n where * where VREF is the supply voltage for this product, and "n" is the DAC resolution in bits, which is 10 for the DAC104S085. (1) MAXIMUM LOAD CAPACITANCE is the maximum capacitance that can be driven by the DAC with output stability maintained. MONOTONICITY is the condition of being monotonic, where the DAC has an output that never decreases when the input code increases. MOST SIGNIFICANT BIT (MSB) is the bit that has the largest value or weight of all bits in a word. Its value is 1/2 of VA. MULTIPLYING BANDWIDTH is the frequency at which the output amplitude falls 3dB below the input sine wave Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: DAC104S085 7 DAC104S085 SNAS362F - MAY 2006 - REVISED MARCH 2013 www.ti.com on VREFIN with a full-scale code loaded into the DAC. POWER EFFICIENCY is the ratio of the output current to the total supply current. The output current comes from the power supply. The difference between the supply and output currents is the power consumed by the device without a load. SETTLING TIME is the time for the output to settle to within 1/2 LSB of the final value after the input code is updated. TOTAL HARMONIC DISTORTION (THD) is the measure of the harmonics present at the output of the DACs with an ideal sine wave applied to VREFIN. THD is measured in dB. WAKE-UP TIME is the time for the output to exit power-down mode. This is the time from the falling edge of the 16th SCLK pulse to when the output voltage deviates from the power-down voltage of 0V. ZERO CODE ERROR is the output error, or voltage, present at the DAC output after a code of 000h has been entered. Transfer Characteristic FSE 1023 x VREFIN 1024 GE = FSE - ZE FSE = GE + ZE OUTPUT VOLTAGE ZE 0 0 1024 DIGITAL INPUT CODE Figure 1. Input / Output Transfer Characteristic Timing Diagrams | 1 / fSCLK SCLK 1 2 13 tSS tSYNC tCL 14 15 16 tCH tCFSR | SYNC DIN | | tDH DB15 DB0 tDS Figure 2. Serial Timing Diagram 8 Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: DAC104S085 DAC104S085 www.ti.com SNAS362F - MAY 2006 - REVISED MARCH 2013 Typical Performance Characteristics VREF = VA, fSCLK = 30 MHz, TA = 25C, Input Code Range 12 to 1011, unless otherwise stated INL at VA = 3.0V INL at VA = 5.0V Figure 3. Figure 4. DNL at VA = 3.0V DNL at VA = 5.0V Figure 5. Figure 6. INL/DNL vs VREFIN at VA = 3.0V INL/DNL vs VREFIN at VA = 5.0V Figure 7. Figure 8. Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: DAC104S085 9 DAC104S085 SNAS362F - MAY 2006 - REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) VREF = VA, fSCLK = 30 MHz, TA = 25C, Input Code Range 12 to 1011, unless otherwise stated 10 INL/DNL vs fSCLK at VA = 2.7V INL/DNL vs VA Figure 9. Figure 10. INL/DNL vs Clock Duty Cycle at VA = 3.0V INL/DNL vs Clock Duty Cycle at VA = 5.0V Figure 11. Figure 12. INL/DNL vs Temperature at VA = 3.0V INL/DNL vs Temperature at VA = 5.0V Figure 13. Figure 14. Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: DAC104S085 DAC104S085 www.ti.com SNAS362F - MAY 2006 - REVISED MARCH 2013 Typical Performance Characteristics (continued) VREF = VA, fSCLK = 30 MHz, TA = 25C, Input Code Range 12 to 1011, unless otherwise stated Zero Code Error vs. VA Zero Code Error vs. VREFIN Figure 15. Figure 16. Zero Code Error vs. fSCLK Zero Code Error vs. Clock Duty Cycle Figure 17. Figure 18. Zero Code Error vs. Temperature Full-Scale Error vs. VA Figure 19. Figure 20. Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: DAC104S085 11 DAC104S085 SNAS362F - MAY 2006 - REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) VREF = VA, fSCLK = 30 MHz, TA = 25C, Input Code Range 12 to 1011, unless otherwise stated 12 Full-Scale Error vs. VREFIN Full-Scale Error vs. fSCLK Figure 21. Figure 22. Full-Scale Error vs. Clock Duty Cycle Full-Scale Error vs. Temperature Figure 23. Figure 24. Supply Current vs. VA Supply Current vs. Temperature Figure 25. Figure 26. Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: DAC104S085 DAC104S085 www.ti.com SNAS362F - MAY 2006 - REVISED MARCH 2013 Typical Performance Characteristics (continued) VREF = VA, fSCLK = 30 MHz, TA = 25C, Input Code Range 12 to 1011, unless otherwise stated 5V Glitch Response Power-On Reset Figure 27. Figure 28. Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: DAC104S085 13 DAC104S085 SNAS362F - MAY 2006 - REVISED MARCH 2013 www.ti.com FUNCTIONAL DESCRIPTION DAC SECTION The DAC104S085 is fabricated on a CMOS process with an architecture that consists of switches and resistor strings that are followed by an output buffer. The reference voltage is externally applied at VREFIN and is shared by all four DACs. For simplicity, a single resistor string is shown in Figure 29. This string consists of 1024 equal valued resistors with a switch at each junction of two resistors, plus a switch to ground. The code loaded into the DAC register determines which switch is closed, connecting the proper node to the amplifier. The input coding is straight binary with an ideal output voltage of: VOUTA,B,C,D = VREFIN x (D / 1024) (2) where D is the decimal equivalent of the binary code that is loaded into the DAC register. D can take on any value between 0 and 1023. This configuration ensures that the DAC is monotonic. VA R R R To Output Amplifier R R Figure 29. DAC Resistor String OUTPUT AMPLIFIERS The output amplifiers are rail-to-rail, providing an output voltage range of 0V to VA when the reference is VA. All amplifiers, even rail-to-rail types, exhibit a loss of linearity as the output approaches the supply rails (0V and VA, in this case). For this reason, linearity is specified over less than the full output range of the DAC. However, if the reference is less than VA, there is only a loss in linearity in the lowest codes. The output capabilities of the amplifier are described in the Electrical Tables. The output amplifiers are capable of driving a load of 2 k in parallel with 1500 pF to ground or to VA. The zerocode and full-scale outputs for given load currents are available in the Electrical Characteristics Table. 14 Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: DAC104S085 DAC104S085 www.ti.com SNAS362F - MAY 2006 - REVISED MARCH 2013 REFERENCE VOLTAGE The DAC104S085 uses a single external reference that is shared by all four channels. The reference pin, VREFIN, is not buffered and has an input impedance of 30 k. It is recommended that VREFIN be driven by a voltage source with low output impedance. The reference voltage range is 1.0V to VA, providing the widest possible output dynamic range. SERIAL INTERFACE The three-wire interface is compatible with SPI, QSPI and MICROWIRE, as well as most DSPs and operates at clock rates up to 40 MHz. See the Timing Diagram for information on a write sequence. A write sequence begins by bringing the SYNC line low. Once SYNC is low, the data on the DIN line is clocked into the 16-bit serial input register on the falling edges of SCLK. To avoid misclocking data into the shift register, it is critical that SYNC not be brought low simultaneously with a falling edge of SCLK (see Serial Timing Diagram, Figure 2). On the 16th falling clock edge, the last data bit is clocked in and the programmed function (a change in the DAC channel address, mode of operation and/or register contents) is executed. At this point the SYNC line may be kept low or brought high. Any data and clock pusles after the 16th falling clock edge will be ignored. In either case, SYNC must be brought high for the minimum specified time before the next write sequence is initiated with a falling edge of SYNC. Since the SYNC and DIN buffers draw more current when they are high, they should be idled low between write sequences to minimize power consumption. INPUT SHIFT REGISTER The input shift register, Figure 30, has sixteen bits. The first two bits are address bits. They determine whether the register data is for DAC A, DAC B, DAC C, or DAC D. The address bits are followed by two bits that determine the mode of operation (writing to a DAC register without updating the outputs of all four DACs, writing to a DAC register and updating the outputs of all four DACs, writing to the register of all four DACs and updating their outputs, or powering down all four outputs). The final twelve bits of the shift register are the data bits. The data format is straight binary (MSB first, LSB last), with all 0's corresponding to an output of 0V and all 1's corresponding to a full-scale output of VREFIN - 1 LSB. The contents of the serial input register are transferred to the DAC register on the sixteenth falling edge of SCLK. See Timing Diagram, Figure 2. LSB MSB A1 A0 OP1 OP0 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 DATA BITS 0 0 1 1 0 1 0 1 DAC A DAC B DAC C DAC D 0 0 1 1 0 1 0 1 Write to specified register but do not update outputs. Write to specified register and update outputs. Write to all registers and update outputs. Power-down outputs. Figure 30. Input Register Contents Normally, the SYNC line is kept low for at least 16 falling edges of SCLK and the DAC is updated on the 16th SCLK falling edge. However, if SYNC is brought high before the 16th falling edge, the data transfer to the shift register is aborted and the write sequence is invalid. Under this condition, the DAC register is not updated and there is no change in the mode of operation or in the DAC output voltages. POWER-ON RESET The power-on reset circuit controls the output voltages of the four DACs during power-up. Upon application of power, the DAC registers are filled with zeros and the output voltages are 0V. The outputs remain at 0V until a valid write sequence is made to the DAC. Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: DAC104S085 15 DAC104S085 SNAS362F - MAY 2006 - REVISED MARCH 2013 www.ti.com POWER-DOWN MODES The DAC104S085 has four power-down modes, two of which are identical. In power-down mode, the supply current drops to 20 A at 3V and 30 A at 5V. The DAC104S085 is set in power-down mode by setting OP1 and OP0 to 11. Since this mode powers down all four DACs, the address bits, A1 and A0, are used to select different output terminations for the DAC outputs. Setting A1 and A0 to 00 or 11 causes the outputs to be tri-stated (a high impedance state). While setting A1 and A0 to 01 or 10 causes the outputs to be terminated by 2.5 k or 100 k to ground respectively (see Table 1). Table 1. Power-Down Modes A1 A0 OP1 OP0 0 0 1 1 Operating Mode High-Z outputs 0 1 1 1 2.5 k to GND 1 0 1 1 100 k to GND 1 1 1 1 High-Z outputs The bias generator, output amplifiers, resistor strings, and other linear circuitry are all shut down in any of the power-down modes. However, the contents of the DAC registers are unaffected when in power-down. Each DAC register maintains its value prior to the DAC104S085 being powered down unless it is changed during the write sequence which instructed it to recover from power down. Minimum power consumption is achieved in the power-down mode with SYNC and DIN idled low and SCLK disabled. The time to exit power-down (Wake-Up Time) is typically tWU sec as stated in the A.C. and Timing Characteristics table. Applications Information USING REFERENCES AS POWER SUPPLIES While the simplicity of the DAC104S085 implies ease of use, it is important to recognize that the path from the reference input (VREFIN) to the VOUTs will have essentially zero Power Supply Rejection Ratio (PSRR). Therefore, it is necessary to provide a noise-free supply voltage to VREFIN. In order to utilize the full dynamic range of the DAC104S085, the supply pin (VA) and VREFIN can be connected together and share the same supply voltage. Since the DAC104S085 consumes very little power, a reference source may be used as the reference input and/or the supply voltage. The advantages of using a reference source over a voltage regulator are accuracy and stability. Some low noise regulators can also be used. Listed below are a few reference and power supply options for the DAC104S085. LM4130 The LM4130, with its 0.05% accuracy over temperature, is a good choice as a reference source for the DAC104S085. The 4.096V version is useful if a 0 to 4.095V output range is desirable or acceptable. Bypassing the LM4130 VIN pin with a 0.1F capacitor and the VOUT pin with a 2.2F capacitor will improve stability and reduce output noise. The LM4130 comes in a space-saving 5-pin SOT23. Input Voltage LM4132-4.1 C1 0.1 PF C2 2.2 PF C3 0.1 PF VA VREFIN DAC104S085 VOUT = 0V to 4.092V SYNC DIN SCLK Figure 31. The LM4130 as a power supply 16 Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: DAC104S085 DAC104S085 www.ti.com SNAS362F - MAY 2006 - REVISED MARCH 2013 LM4050 Available with accuracy of 0.44%, the LM4050 shunt reference is also a good choice as a reference for the DAC104S085. It is available in 4.096V and 5V versions and comes in a space-saving 3-pin SOT23. Input Voltage R VZ IDAC IZ 0.1 PF 0.47 PF LM4050-4.1 or LM4050-5.0 VA VREFIN DAC104S085 VOUT = 0V to 5V SYNC DIN SCLK Figure 32. The LM4050 as a power supply The minimum resistor value in the circuit of Figure 32 must be chosen such that the maximum current through the LM4050 does not exceed its 15 mA rating. The conditions for maximum current include the input voltage at its maximum, the LM4050 voltage at its minimum, and the DAC104S085 drawing zero current. The maximum resistor value must allow the LM4050 to draw more than its minimum current for regulation plus the maximum DAC104S085 current in full operation. The conditions for minimum current include the input voltage at its minimum, the LM4050 voltage at its maximum, the resistor value at its maximum due to tolerance, and the DAC104S085 draws its maximum current. These conditions can be summarized as R(min) = ( VIN(max) - VZ(min) ) /IZ(max) (3) and R(max) = ( VIN(min) - VZ(max) ) / ( (IDAC(max) + IZ(min) ) where * * * * VZ(min) and VZ(max) are the nominal LM4050 output voltages the LM4050 output tolerance over temperature IZ(max) is the maximum allowable current through the LM4050 IZ(min) is the minimum current required by the LM4050 for proper regulation IDAC(max) is the maximum DAC104S085 supply current. (4) LP3985 The LP3985 is a low noise, ultra low dropout voltage regulator with a 3% accuracy over temperature. It is a good choice for applications that do not require a precision reference for the DAC104S085. It comes in 3.0V, 3.3V and 5V versions, among others, and sports a low 30 V noise specification at low frequencies. Since low frequency noise is relatively difficult to filter, this specification could be important for some applications. The LP3985 comes in a space-saving 5-pin SOT-23 and 5-bump DSBGA packages. Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: DAC104S085 17 DAC104S085 SNAS362F - MAY 2006 - REVISED MARCH 2013 www.ti.com Input Voltage LP3985 0.1 PF 1 PF 0.01 PF 0.1 PF VA VREFIN DAC104S085 VOUT = 0V to 5V SYNC DIN SCLK Figure 33. Using the LP3985 regulator An input capacitance of 1.0F without any ESR requirement is required at the LP3985 input, while a 1.0F ceramic capacitor with an ESR requirement of 5m to 500m is required at the output. Careful interpretation and understanding of the capacitor specification is required to ensure correct device operation. LP2980 The LP2980 is an ultra low dropout regulator with a 0.5% or 1.0% accuracy over temperature, depending upon grade. It is available in 3.0V, 3.3V and 5V versions, among others. Input Voltage VIN VOUT LP2980 ON /OFF 1 PF 0.1 PF VA VREFIN DAC104S085 VOUT = 0V to 5V SYNC DIN SCLK Figure 34. Using the LP2980 regulator Like any low dropout regulator, the LP2980 requires an output capacitor for loop stability. This output capacitor must be at least 1.0F over temperature, but values of 2.2F or more will provide even better performance. The ESR of this capacitor should be within the range specified in the LP2980 data sheet. Surface-mount solid tantalum capacitors offer a good combination of small size and ESR. Ceramic capacitors are attractive due to their small size but generally have ESR values that are too low for use with the LP2980. Aluminum electrolytic capacitors are typically not a good choice due to their large size and have ESR values that may be too high at low temperatures. BIPOLAR OPERATION The DAC104S085 is designed for single supply operation and thus has a unipolar output. However, a bipolar output may be obtained with the circuit in Figure 35. This circuit will provide an output voltage range of 5 Volts. A rail-to-rail amplifier should be used if the amplifier supplies are limited to 5V. 18 Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: DAC104S085 DAC104S085 www.ti.com SNAS362F - MAY 2006 - REVISED MARCH 2013 10 pF R2 +5V R1 +5V 10 PF + - 0.1 PF 5V + DAC104S085 -5V SYNC DIN VOUT SCLK Figure 35. Bipolar Operation The output voltage of this circuit for any code is found to be VO = (VA x (D / 1024) x ((R1 + R2) / R1) - VA x R2 / R1) where * D is the input code in decimal form * With VA = 5V and R1 = R2 VO = (10 x D / 1024) - 5V (5) (6) A list of rail-to-rail amplifiers suitable for this application are indicated in Table 2. Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: DAC104S085 19 DAC104S085 SNAS362F - MAY 2006 - REVISED MARCH 2013 www.ti.com Table 2. Some Rail-to-Rail Amplifiers AMP PKGS LMC7111 DIP-8 SOT23-5 Typ VOS Typ ISUPPLY 0.9 mV 25 A LM7301 SO-8 SOT23-5 0.03 mV 620 A LM8261 SOT23-5 0.7 mV 1 mA DSP/MICROPROCESSOR INTERFACING Interfacing the DAC104S085 to microprocessors and DSPs is quite simple. The following guidelines are offered to hasten the design process. ADSP-2101/ADSP2103 Interfacing Figure 36 shows a serial interface between the DAC104S085 and the ADSP-2101/ADSP2103. The DSP should be set to operate in the SPORT Transmit Alternate Framing Mode. It is programmed through the SPORT control register and should be configured for Internal Clock Operation, Active Low Framing and 16-bit Word Length. Transmission is started by writing a word to the Tx register after the SPORT mode has been enabled. ADSP-2101/ ADSP2103 TFS DT SCLK DAC104S085 SYNC DIN SCLK Figure 36. ADSP-2101/2103 Interface 80C51/80L51 Interface A serial interface between the DAC104S085 and the 80C51/80L51 microcontroller is shown in Figure 37. The SYNC signal comes from a bit-programmable pin on the microcontroller. The example shown here uses port line P3.3. This line is taken low when data is transmitted to the DAC104S085. Since the 80C51/80L51 transmits 8-bit bytes, only eight falling clock edges occur in the transmit cycle. To load data into the DAC, the P3.3 line must be left low after the first eight bits are transmitted. A second write cycle is initiated to transmit the second byte of data, after which port line P3.3 is brought high. The 80C51/80L51 transmit routine must recognize that the 80C51/80L51 transmits data with the LSB first while the DAC104S085 requires data with the MSB first. 80C51/80L51 DAC104S085 P3.3 SYNC TXD SCLK RXD DIN Figure 37. 80C51/80L51 Interface 68HC11 Interface A serial interface between the DAC104S085 and the 68HC11 microcontroller is shown in Figure 38. The SYNC line of the DAC104S085 is driven from a port line (PC7 in the figure), similar to the 80C51/80L51. The 68HC11 should be configured with its CPOL bit as a zero and its CPHA bit as a one. This configuration causes data on the MOSI output to be valid on the falling edge of SCLK. PC7 is taken low to transmit data to the DAC. The 68HC11 transmits data in 8-bit bytes with eight falling clock edges. Data is transmitted with the MSB first. PC7 must remain low after the first eight bits are transferred. A second write cycle is initiated to transmit the second byte of data to the DAC, after which PC7 should be raised to end the write sequence. 20 Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: DAC104S085 DAC104S085 www.ti.com SNAS362F - MAY 2006 - REVISED MARCH 2013 68HC11 DAC104S085 PC7 SYNC SCK SCLK MOSI DIN Figure 38. 68HC11 Interface Microwire Interface Figure 39 shows an interface between a Microwire compatible device and the DAC104S085. Data is clocked out on the rising edges of the SK signal. As a result, the SK of the Microwire device needs to be inverted before driving the SCLK of the DAC104S085. MICROWIRE DEVICE CS SYNC SK SCLK SO DIN DAC104S085 Figure 39. Microwire Interface LAYOUT, GROUNDING, AND BYPASSING For best accuracy and minimum noise, the printed circuit board containing the DAC104S085 should have separate analog and digital areas. The areas are defined by the locations of the analog and digital power planes. Both of these planes should be located in the same board layer. There should be a single ground plane. A single ground plane is preferred if digital return current does not flow through the analog ground area. Frequently a single ground plane design will utilize a "fencing" technique to prevent the mixing of analog and digital ground current. Separate ground planes should only be utilized when the fencing technique is inadequate. The separate ground planes must be connected in one place, preferably near the DAC104S085. Special care is required to ensure that digital signals with fast edge rates do not pass over split ground planes. They must always have a continuous return path below their traces. The DAC104S085 power supply should be bypassed with a 10F and a 0.1F capacitor as close as possible to the device with the 0.1F right at the device supply pin. The 10F capacitor should be a tantalum type and the 0.1F capacitor should be a low ESL, low ESR type. The power supply for the DAC104S085 should only be used for analog circuits. Avoid crossover of analog and digital signals and keep the clock and data lines on the component side of the board. The clock and data lines should have controlled impedances. Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: DAC104S085 21 DAC104S085 SNAS362F - MAY 2006 - REVISED MARCH 2013 www.ti.com REVISION HISTORY Changes from Revision E (March 2013) to Revision F * 22 Page Changed layout of National Data Sheet to TI format .......................................................................................................... 21 Submit Documentation Feedback Copyright (c) 2006-2013, Texas Instruments Incorporated Product Folder Links: DAC104S085 PACKAGE OPTION ADDENDUM www.ti.com 7-Oct-2013 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish (2) MSL Peak Temp Op Temp (C) Device Marking (3) (4/5) DAC104S085CIMM/NOPB ACTIVE VSSOP DGS 10 1000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 105 X68C DAC104S085CIMMX/NOPB ACTIVE VSSOP DGS 10 3500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 105 X68C DAC104S085CISD/NOPB ACTIVE WSON DSC 10 1000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 105 X69C DAC104S085CISDX/NOPB ACTIVE WSON DSC 10 4500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 105 X69C DAC104S085QIMM/NOPB ACTIVE VSSOP DGS 10 1000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 X68Q DAC104S085QIMMX/NOPB ACTIVE VSSOP DGS 10 3500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 X68Q (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. Addendum-Page 1 Samples PACKAGE OPTION ADDENDUM www.ti.com 7-Oct-2013 Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. 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OTHER QUALIFIED VERSIONS OF DAC104S085, DAC104S085-Q1 : * Catalog: DAC104S085 * Automotive: DAC104S085-Q1 NOTE: Qualified Version Definitions: * Catalog - TI's standard catalog product * Automotive - Q100 devices qualified for high-reliability automotive applications targeting zero defects Addendum-Page 2 PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant DAC104S085CIMM/NOPB VSSOP DGS 10 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 DAC104S085CIMMX/NOP VSSOP B DGS 10 3500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 DAC104S085CISD/NOPB WSON DSC 10 1000 178.0 12.4 3.3 3.3 1.0 8.0 12.0 Q1 DAC104S085CISDX/NOP B WSON DSC 10 4500 330.0 12.4 3.3 3.3 1.0 8.0 12.0 Q1 DAC104S085QIMM/NOP B VSSOP DGS 10 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 DAC104S085QIMMX/NO PB VSSOP DGS 10 3500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 Pack Materials-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) DAC104S085CIMM/NOPB VSSOP DGS 10 1000 210.0 185.0 35.0 DAC104S085CIMMX/NOP B VSSOP DGS 10 3500 367.0 367.0 35.0 DAC104S085CISD/NOPB WSON DSC 10 1000 210.0 185.0 35.0 DAC104S085CISDX/NOP B WSON DSC 10 4500 367.0 367.0 35.0 DAC104S085QIMM/NOPB VSSOP DGS 10 1000 210.0 185.0 35.0 VSSOP DGS 10 3500 367.0 367.0 35.0 DAC104S085QIMMX/NOP B Pack Materials-Page 2 MECHANICAL DATA DSC0010A SDA10A (Rev A) www.ti.com IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. 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