Philips Semiconductors Linear Products Product specification MC3410, MC3410C 10-Bit high-speed multiplying D/A converter DESCRIPTION PIN CONFIGURATION The MC3410 series are 10-bit Multiplying Digital-to-Analog Converters. They are capable of high-speed performance, and are used as general-purpose building blocks in cost-effective D/A systems. F Package The Philips Semiconductors design provides complete 10-bit accuracy without laser trimming, and guaranteed monotonicity over temperature. Segmented current sources, in conjunction with an R-2R DAC provides the binary weighted currents. The output buffer amplifier and voltage reference have been omitted to allow greater speed, lower cost, and maximum user flexibility. VEE 1 16 VREF + GND 2 15 VREF - OUTPUT 3 14 VCC D1 MSB 4 FEATURES * 10-bit resolution and accuracy (0.05%) * Guaranteed monotonicity over temperature * Fast settling time--250ns typical * Digital inputs are TTL and CMOS compatible * Wide output voltage compliance range * High-speed multiplying input slew rate--20mA/s * Reference amplifier internally-compensated * Standard supply voltages +5V and -15V 13 D10 (LSB) D2 5 12 D9 D3 6 11 D4 7 10 D7 D5 8 9 D8 D6 TOP VIEW BLOCK DIAGRAM MSB LSB D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 4 5 6 7 8 9 10 11 12 13 I0 3 CURRENT SWITCHES APPLICATIONS LADDER TERMINATORS * Successive approximation A/D converters * High-speed, automatic test equipment * High-speed modems * Waveform generators * CRT displays * Strip CHART and X-Y plotters * Programmable power supplies * Programmable gain and attenuation R-2R LADDER VREF(+) VREF(-) 16 15 BIAS CIRCUITRY REFERENCE CURRENT AMPLIFIER 14 VCC 1 VEE 2 GND ORDERING INFORMATION DESCRIPTION TEMPERATURE RANGE ORDER CODE DWG # 16-Pin Ceramic Dual In-Line Package (CERDIP) 0 to +70C MC3410F 0582B 16-Pin Ceramic Dual In-Line Package (CERDIP) 0 to +70C MC3410CF 0582B August 31, 1994 743 853-0936 13721 Philips Semiconductors Linear Products Product specification MC3410, MC3410C 10-Bit high-speed multiplying D/A converter ABSOLUTE MAXIMUM RATINGS TA=+25C unless otherwise noted SYMBOL RATING UNIT Power supply +7.0 VDC -18 VDC VI Digital input voltage +15 VDC VO Applied output voltage 0.5, -5.0 VDC IREF(16) Reference current 2.5 mA VREF Reference amplifier inputs VCC, VEE VDC VREF(D) Reference amplifier differential inputs 0.7 VDC TA Operating ambient temperature range MC3410, 3410C 0 to +70 C TJ Junction temperature, ceramic package +150 C PD Maximum power dissipation, 1190 mW VCC PARAMETER VEE TA=25C (still-air)1 F package NOTES: 1. Derate above 25C, at the following rates: F package at 9.5mW/C August 31, 1994 744 Philips Semiconductors Linear Products Product specification MC3410, MC3410C 10-Bit high-speed multiplying D/A converter ELECTRICAL CHARACTERISTICS VCC=+5.0VDC, VEE=-15DC, SYMBOL V REF =2.0mA, all digital inputs at high logic level. MC3410 Series: TA=0C to +70C, unless otherwise noted. R16 PARAMETER Er Relative accuracy (error relative to full-scale IO) TCEr Relative accuracy drift (relative to full-scale IO) Monotonicity TEST CONDITIONS MC3410 Min Typ TA=25C MC3410C Max Min Max UNIT 0.05 0.1 % 1/4 1/2 LSB 2.5 Over temperature Typ 2.5 10 ppm/C 10 Bits tS Settling time to within LSB (all bits LOW-to-HIGH) TA=25C 250 250 ns tPLH tPHL Propagation delay time TA=25C 35 20 35 20 ns TCIO Output full scale current drift VIH Digital input logic levels (all bits) HIGH-level, Logic "1" LOW-level, Logic "0" 60 2.0 0.8 70 ppm/C VDC 2.0 0.8 IIH IIL Digital input current (all bits) HIGH-level, VIH=5.5V LOW-level, VIL=0.8V -0.05 +.04 -0.4 -0.05 +.04 -0.4 IREF(15) Reference input bias current (Pin 15) -1.0 -5.0 -1.0 -5.0 A IOR Output current range 4.0 5.0 4.0 5.0 mA IOH Output current (all bits high) VREF=2.000V, R16=1000 3.996 4.2 3.996 4.2 mA IOL Output current (all bits low) TA=25C 4.0 A -2.5 +0.2 VDC VO Output voltage compliance SR IREF Reference amplifier slew rate ST IREF Reference amplifier settling time PSRR(-) Output current power supply sensitivity CO Output capacitance CI Digital input capacitance (all bits high) ICC IEE Power supply current (all bits low) VCC VEE Power supply voltage range 0 3.8 2.0 0 -2.5 +0.2 TA=25C 20 0 to 4.0mA, 0.1% VO=0 TA=25C 745 20 2.0 0.003 Power consumption (all bits low) (all bits high) August 31, 1994 3.8 +4.75 -14.25 mA/s s 2.0 0.01 0.003 mA 0.02 %/% 25 25 pF 4.0 4.0 pF -11.4 +18 -20 +5.0 -15 +5.25 -15.75 220 200 380 +4.75 -14.25 -11.4 +18 -20 +5.0 -15 +5.25 -15.75 VDC 220 200 380 mW mA Philips Semiconductors Linear Products Product specification MC3410, MC3410C 10-Bit high-speed multiplying D/A converter VCC = +5.0V VEE = -15.0V TA = 25oC IREF = 2mA 3.0 2.0 RELATIVE OUTPUT (dB) OUTPUT CFURRENT (mA) 4.0 1.0 0 -1.0 -5 -3 -1 0 1 3 5 COMPLIANCE VOLTAGE (VOLTS) OUTPUT COMPLIANCE VOLTAGE (VOLTS) +VCC = +5V -VEE = -15V IREF = 2mA 1.0 0 -1.0 CENTERED AT + 1.0V 0.2 0.3 0.5 1.0 2.0 3.0 5.0 10 The individual bit currents are switched ON or OFF by fully differential current switches. The switches use current steering for speed. -2.0 -3.0 0 25 50 75 An on-chip high-slew reference current amplifier drives the R-2R ladder and segment decoder. The currents are scaled in such a way that, with all bits on, the maximum output current is two times 1023/1024 of the reference amplifier current, or nominally 3.996mA for a 2.000mA reference input current. The reference amplifier allows the user to provide a voltage input. Out-board resistor R16 (see Figure 6) converts this voltage to a usable current. A current mirror doubles this reference current and feeds it to the segment decoder and resistor ladder. Thus, for a reference voltage of 2.0V and a 1k resistor tied to Pin 16, the full-scale current is approximately 4.0mA. This relationship will remain regardless of the reference voltage polarity. 100 125 Figure 2. Maximum Output Compliance Voltage vs Temperature I CC, POWER SUPPLY CURRENT (mA) A CURVE LARGE SIGNAL BW ro = 200 VREF (+) = 2 Vp-p The MC3410 consists of four segment current sources which generate the two most significant bits (MSBs), and an R-2R DAC implemented with ion-implanted resistors for scaling the remaining eight least significant bits (LSBs) (See Figure 5). This approach provides complete 10-bit accuracy without trimming. 2.0 TA = (oC) 13 IEE 11 +VCC = +5V -VEE = -15V IREF = 2mA 10 4 Connections for a positive reference voltage are shown in Figure 6a. For negative reference voltage inputs, or for bipolar reference voltage inputs in the multiplying mode, R15 can be tied to a negative voltage corresponding to the minimum input level. For a negative reference input, R16 should be grounded (Figure 6b). In addition, the negative voltage reference must be at least 3V above the VEE supply voltage for best operation. Bipolar input signals may be handled by connecting R16 to a positive voltage equal to the peak positive input level at Pin 15. 3 +ICC 2 1 0 0 25 50 TA (oC) 75 100 125 Figure 3. Power Supply Current vs Temperature August 31, 1994 CENTERED AT + 200mV CIRCUIT DESCRIPTION 3.0 -75 -50 -25 R15 = R16 = 1.0k VREF (-) = 0V Figure 4. Reference Amplifier Frequency Response 4.0 12 B CURVE SMALL SIGNAL BW ro = 100 VREF (+) = 50 mV p-p I, FREQUENCY (MHz) Figure 1. Output Current vs Output Compliance Voltage -4.0 -75 -50 -25 18.0 16.0 14.0 12.0 10.0 8.0 6.0 4.0 2.0 0 -2.0 -4.0 -6.0 -8.0 -10 -12 0.1 746 Philips Semiconductors Linear Products Product specification MC3410, MC3410C 10-Bit high-speed multiplying D/A converter When a DC reference voltage is used, capacitive bypass to ground is recommended. The 5V logic supply is not recommended as a reference voltage. If a well regulated 5.0V supply, which drives logic, is to be used as the reference, R16 should be decoupled by connecting it to the +5.0V logic supply through another resistor and bypassing the junction of the two resistors with a 0.1F capacitor to ground. OUTPUT VOLTAGE COMPLIANCE The reference amplifier is internally-compensated with a 10pF feed-forward capacitor, which gives it its high slew rate and fast settling time. Proper phase margin is maintained with all possible values of R16 and reference voltages which supply 2.0mA reference current into Pin 16. The reference current can also be supplied by a high impedance current source of 2.0mA. As R16 increases, the bandwidth of the amplifier decreases slightly and settling time increases. For a current source with a dynamic output impedance of 1.0M, the bandwidth of the reference amplifier is approximately half what it is in the case of R16=1.0k, and settling time is 10s. The reference amplifier phase margin decreases as the current source value decreases in the case of a current source reference, so that the minimum reference current supplied from a current source is 0.5mA for stability. ACCURACY (4) MSB D1 (5) D2 (6) D3 (7) D4 The output voltage compliance ranges from -2.5 to +0.2V. As shown in Figure 2, this compliance range is nearly constant over temperature. At the temperature extremes, however, the compliance voltage may be reduced if VEE>-15V. Absolute accuracy is a measure of each output current level with respect to its intended value. It is dependent upon relative accuracy and full-scale current drift. Relative accuracy, or linearity, is the measure of each output current with respect to its intended fraction of the full-scale current. The relative accuracy of the MC3410 is fairly constant over temperature due to the excellent temperature tracking, of the implanted resistors. The full-scale current from the reference amplifier may drift with temperature causing a change in the absolute accuracy. However, the MC3410 has a low full-scale current drift with temperature. The MC3410 are accurate to within 0.05% at 25C with a reference current of 2.0mA on Pin 16. (8) D5 (9) D6 (10) D7 (11) D8 (12) D9 (13) LSB D10 GND (2) IOUT (3) SEGMENT DECODER VBIAS (INTERNAL) 2R R 2R 2R R 2R R 2R R 2R R 2R R (16) + VREF + CODE SELECTED 0111110011 (15) - - 2R1 R1 R1 R1 R1 VEE (1) Figure 5. MC3410 Equivalent Circuit August 31, 1994 747 2R Philips Semiconductors Linear Products Product specification MC3410, MC3410C 10-Bit high-speed multiplying D/A converter VR (+) RT VCC R16 R15 15 16 14 IO 3410 D1 THROUGH D10 1 3 NOTES: R16 + RT = R15 = RREF RT < <R16 IO F.S. = 2 IR = VREF/RREF 2 VEE a. Positive Reference Voltage RT VR (-) VCC R16 R15 13 15 IO 3410 D1 THROUGH D10 1 NOTES: R15 + RT = R16 RT < <R15 IVREF RVEE + 3V 2 VEE a. Negative Reference Voltage Figure 6. Basic Connections The major carry (MSB off-to-on, all others on-to-off) settles in approximately the same time as when all bits are switched off-to-on. MONOTONICITY The MC3410 and MC3410C are guaranteed monotonic over temperature. This means that for every increase in the input digital code, the output current either remains the same or increases but never decreases. In the multiplying mode, where reference input current will vary, monotonicity can be assured if the reference input current remains above 0.5mA. If a load resistor of 625 is connected to ground, allowing the output to swing to -2.5V, the settling time increases to 1.5s. Extra care must be taken in board layout as this is usually the dominant factor in satisfactory test results when measuring settling time. Short leads, 100F supply bypassing, and minimum scope lead length are all necessary. SETTLING TIME A typical test setup for measuring settling time is shown in Figure 7. The same setup for the most part can be used to measure the slew rate of the reference amplifier (Figure 9) by tying all data bits high, pulsing the voltage reference input between 0 and 2V, and using a 500 load resistor RL. The worst-case switching condition occurs when all bits are switched "on," which corresponds to a low-to-high transition for all bits. This time is typically 250ns for the output to settle to within 1/2LSB for 10-bit accuracy, and 200ns for 8-bit accuracy. The turn-off time is typically 120ns. These times apply when the output swing is limited to a small (<0.7V) swing and the external output capacitance is under 25pF. August 31, 1994 748 Philips Semiconductors Linear Products Product specification MC3410, MC3410C 10-Bit high-speed multiplying D/A converter VCC 0.1F +2VDC 14 1k 16 4 RISE AND FALL TIMES 10ns 2.4V 5 6 1k 15 9 500 3 12 13 VO VO 11 50 0.5V MC3410 10 VI 0.4V RL 8 1.4V VI 0.1F 7 0 CO 25pF 2 tS -- 250ns TYPICAL TO 1/2 LSB USE RL TO GND FOR TURN-OFF MEASUREMENT FOR SETTLING TIME MEASUREMENT. (ALL BIT SWITCHED LOW TO HIGH) 1 0.1F VEE Figure 7. Settling Time VCC 0.1F 14 4 16 1k 15 1k RISE AND FALL TIMES 10ns +2VDC 2.4V VI 5 6 0.1F 0.4V 7 8 9 MC3410 10 3 VO 11 12 13 VI 50 2 VO RL 20 0V -80mV TO 1/2 LSB 1 0.1F tPHL tPLH FOR PROPAGATION DELAY TIME VEE Figure 8. Propagation Delay Time August 31, 1994 749 Philips Semiconductors Linear Products Product specification MC3410, MC3410C 10-Bit high-speed multiplying D/A converter VCC 0.1F VREF (+) 2V 0 14 4 16 1k 15 1k 2.0V 5 6 7 8 9 0.1F VREF (+) 0 RL 500 MC3410 10 3 12 0 25pF 2 SLEW RATE VO VO 11 13 0.5V tS = 2s TYPICAL TO 0.1% NOTE: 1 Use RL = 20 to GND for slew rate measurement. 0.1F VEE Figure 9. Reference Amplifier Settling Time and Slew Rate P BUS CONTROL SIGNAL FROM P 7 6 5 4 3 2 1 0 OE D10 D9 8-BIT LATCH LS373 D8 D7 D6 D5 D4 10-BIT DAC (MC3410) D3 D2 D1 E2 E1 2-BIT Q0 LATCH 1/2 LS375 Q2 E0-2 E1 E2 EEEE EEEE EEEE EEEE DATA E2-3 Q2 2-BIT LATCH Q3 1/2 LS375 EE EE EE EE D1 - D2 EEEEE EEEEE EEEEE EEEEE D3 - D10 Figure 10. Interfacing 10-Bit DAC With 8-Bit Microprocessor August 31, 1994 750 OUTPUT