TPF632A / TPF605A / TPF607A 3-VRMS Audio Line Driver with Integrated Charge Pump Features Description 3-VRMS Output into 2.5k Load with 5V Supply Integrated Charge Pump Generates Negative Supply Rail The 3PEAK TPF632A/605A/607A are 3-VRMS pop-free stereo line drivers with the integrated charge pump generating the negative supply rail which allows the removal of the output DC-blocking capacitors. The devices are capable of driving 3-VRMS into a 2.5-k load with single 5V supply voltage. The TPF632A has differential inputs, the TPF605A/607A support single-ended inputs, and all can use external resistors for flexible gain setting. 2-VRMS Output into 2.5k Load with 3.3V Supply SNR Enhanced PVDD Power Off Delay Function Low THD+N: 0.001% Drives 600 Load Stable with 220pF Capacitive Load Pop-Free Under-Voltage Protection (TPF632A/605A) Pop-Free Enable Control -40C to 85C Operation Range Robust 8kV (Output-Pin) HBM ESD Rating On All Pins Robust 2kV CDM ESD Rating Green, Popular Type Package Applications Set-Top Box PDP TV and LCD TV The 3PEAK TPF632A/605A/607A has built-in enable/shutdown control for pop-free on/off control. The TPF632A/605A has an external under-voltage detector that mutes the output when monitored voltage drop below set value. Using the TPF632A/605A/607A in audio products can reduce component count considerably compared to traditional methods of generating a 3-VRMS output. The device needs only a single 5V supply to generate 8.5-VPP output while traditional op-amp requires a split-rail power supply to achieve same. The device is ideal for single-supply electronics where size and cost are critical design parameters. 3PEAK and the 3PEAK logo are registered trademarks of 3PEAK INCORPORATED. All other trademarks are the property of their respective owners. Blue-ray and HD DVD Players Audio Line Drivers Part Number Package TPF632A TSSOP-14 TPF607A MSOP-10 TPF605A Remarks MSOP-10-EP 5V/3.3V,Differential inputs 5V/3.3V, Single-ended inputs Single-ended inputs, no UVP control Pin Configuration (Top View) TPF632A 14-Pin TSSOP +INR -INR OUTR GND EN PVSS CN TPF605A 10-Pin MSOP-EP 1 14 +INL 3 12 OUTL 2 4 5 6 7 13 UVP Charge Pump www.3peakic.com 11 10 9 8 -INL UVP PGND PVDD -INR OUTR EN PVSS CN 1 2 3 4 5 TPF607A 10-Pin MSOP 10 GND UVP Charge Pump 9 8 7 6 -INL OUTL UVP PVDD CP -INR OUTR EN PVSS CN 1 10 2 9 3 4 5 8 Charge Pump 7 6 -INL OUTL GND PVDD CP CP Rev. C 1 TPF632A / TPF605A / TPF607A 3-VRMS Audio Line Driver with Integrated Charge Pump Order Information Model Name Order Number TPF605A TPF605A-VR TPF632A TPF607A Package Transport Media, Quantity Marking Information 10-Pin MSOP-EP Tape and Reel, 3000 TPF605A TPF632A-TR 14-Pin TSSOP TPF607A-VR 10-Pin MSOP Absolute Maximum Ratings Note 1 Tape and Reel, 3000 TPF632A Tape and Reel, 3000 TPF607A Supply Voltage: V - V ....................................6.0V Output Short-Circuit Duration Note 3............ Indefinite Input Current: +IN, -IN, SHDN Note 2.............. 10mA Maximum Junction Temperature................... 150C + - Input Voltage............................. V - 0.3 to V + 0.3 - + EN Pin Voltage.................................V to V - + Output Current: OUT.................................... 20mA Operating Temperature Range.......-40C to 125C Storage Temperature Range.......... -65C to 150C Lead Temperature (Soldering, 10 sec) ......... 260C Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The inputs are protected by ESD protection diodes to each power supply. If the input extends more than 500mV beyond the power supply, the input current should be limited to less than 10mA. Note 3: A heat sink may be required to keep the junction temperature below the absolute maximum. This depends on the power supply voltage and how many amplifiers are shorted. Thermal resistance varies with the amount of PC board metal connected to the package. The specified values are for short traces connected to the leads. ESD, Electrostatic Discharge Protection All All Pin HBM Symbol CDM Parameter Human Body Model ESD Charged Device Model ESD Condition MIL-STD-883H Method 3015.8 JEDEC-EIA/JESD22-C101E Minimum Level 8 2 Unit kV kV Thermal Resistance Package Type JA 10-Pin MSOP 120 14-Pin TSSOP 10-Pin MSOP-EP 2 Rev. C JC Unit 130 49 C/W 70 10 C/W 45 C/W www.3peakic.com TPF632A / TPF605A / TPF607A 3-VRMS Audio Line Driver with Integrated Charge Pump 5V Electrical Characteristics Specifications are at TA = 27C. VDD = 5V, RL = 2.5k, CPUMP=CPVSS=1F, CIN =10F, RIN = 10k, RFB = 20k, unless otherwise noted. SYMBOL PARAMETER VDD Supply Voltage Range IQ Quiescent Current VOS Output Offset Voltage CONDITIONS Input grounded, unity gain. No load IQ(off) Supply Current in Shutdown VO Output Voltage THD+N Total Harmonic Distortion Plus Noise VENH High-level Threshold Voltage(EN) VENL Low-level Threshold voltage(EN) |IENH| High-level input current(EN) VDD = 5 V, VI = VDD Crosstalk Short Circuit Current Input Resistor Range Slew Rate Maximum Capacitive Load Flying Capacitor Noise Output Voltage Signal to Noise Ratio Unity Gain Bandwidth Open-Loop Voltage Gain VO=3VRMS, f=1kHz VDD=5V |IENL| XTALK ISC RIN SR CL CF VN SNR GBW AVOL VUVP IHYS fCP Low-level input current(EN) External Under-voltage Detection External Under-voltage Detection Hysteresis Current Charge Pump Frequency www.3peakic.com VDD=3.3V, f=1kHz, THD=1% VDD=5V, f=1kHz, THD=1% VO=3VRMS, f=1kHz VDD=3.3V, EN Low to High Transition VDD=5V, EN Low to High Transition VDD=3.3V, EN High to Low Transition MIN 2.7 -4 TYP 4.6 2.05 3.05 1 UNITS 4 mV 5.5 0.2 1 0.1 1 0.1 1.18 1.23 0.33 4.3 117 10 130 1.23 1.27 4.7 330 Rev. C mA VRMS V 0.5 -110 20 10 5 mA % 0.6 VDD = 5 V, VI = 0 V V VRMS 0.001 VDD=5V, EN Low to High Transition BW=20Hz to 20kHz VO=3VRMS, f=1kHz, BW=20kHz No load No load VDD=3.3V VDD=5V MAX 1 47 220 2.2 1.28 1.30 V V V A A dB mA k V/s pF F VRMS dB MHz dB V V A kHz 3 TPF632A / TPF605A / TPF607A 3-VRMS Audio Line Driver with Integrated Charge Pump Typical Performance Characteristics Total Harmonic Distortion + Noise vs. Output Voltage Total Harmonic Distortion + Noise vs. Output Voltage 10 V DD =3.3V RL =100k f=1kHz 1 0.1 THD+N (%) THD+N (%) 10 0.01 0.001 0.1 1 Output Voltage (Vrms) 0.0001 10 Total Harmonic Distortion + Noise vs. Output Voltage THD+N (%) THD+N (%) 0.1 0.01 10 V DD =5V RL =600 f=1kHz 1 0.1 0.01 0.001 0.0001 1 Output Voltage (Vrms) 10 V DD =3.3V RL =2.5k f=1kHz 1 0.1 Total Harmonic Distortion + Noise vs. Output Voltage 10 0.001 0.1 1 Output Voltage (Vrms) 10 0.0001 Total Harmonic Distortion + Noise vs. Frequency 1 Output Voltage (V rms) 10 0.1 V DD =5V RL =100k Vo=2Vrms THD+N (%) THD+N (%) VDD=3.3V RL =2.5k Vo=2Vrms 0.01 0.01 0.001 0.001 0.0001 0.1 Total Harmonic Distortion + Noise vs. Frequency 0.1 4 0.1 0.01 0.001 0.0001 VDD =5V RL =100k f=1kHz 1 10 Rev. C 100 1k 10k Frequency (Hz) 100k 0.0001 10 100 1k 10k Frequency (Hz) 100k www.3peakic.com TPF632A / TPF605A / TPF607A 3-VRMS Audio Line Driver with Integrated Charge Pump Pin Functions PIN Name Number -INR 2/1 GND 4/EP/8 PVSS 6/4 +INR OUTR EN 1 Positive input of the right channel OPAMP 3/2 O Output of the right channel OPAMP 5/3 I 7/5 PVDD 9/7 PGND UVP OUTL -INL +INR Description I CN CP I/O I Negative input of the right channel OPAMP P Ground P Negative supply generated with integrated charge pump Enable I/O Negative terminal of the flying capacitor of the charge 8/6 I/O Positive terminal of the flying capacitor of the charge 10 P Ground for charge pump 12/9 O Output of the left channel OPAMP 14 I P 11/8 Positive supply I 13/10 Under-voltage protection input I Negative input of the left channel OPAMP Positive input of the left channel OPAMP Applications Information Typical Application Circuit -VINR VOUTR CIN RIN RFB RFB GND UVP EN 1F PVSS RIN CIN -VINL VOUTL UVP PGND Charge Pump CN PVDD CP 1F 0.33F Figure 2 Typical Application Circuit of TPF632A www.3peakic.com Rev. C 5 TPF632A / TPF605A / TPF607A 3-VRMS Audio Line Driver with Integrated Charge Pump -VINR CIN RIN RFB RFB EN PVSS 1F UVP Charge Pump CN Figure 3 RIN CIN -VINL VOUTL UVP PVDD CP 1F Typical Application Circuit of TPF605ALeftand TPF607ARight Typical application circuits are shown as above. TPF632A/605A/607A operates from a single supply voltage PVDD. It integrated charge pump generates a negative supply -PVDD at the PVSS pin. The Line driving amplifiers work with dual supplies: PVDD and -PVDD. Therefore, the DC level of the audio output can be designed to be 0V. A DC-blocking capacitor typically seen in a single-supplied driver is not necessary. The supply range of the TPF632A/605A/607A is 2.7V to 5.5V. For a 3VRMS output, the recommended supply voltage is 5V. For a 2VRMS output, the recommended supply voltage is 3.3V. RIN of 2.5k and RFB of 5k set the inverting gain of 2. Because of the exceptional noise performance of TPF632A/605A/607A, the dominant noise source is actually from RIN. To get better noise performance, lower input resistance and feedback resistance may be used. Integrated Charge Pump The integrated charge pump in TPF632A/605A/607A generates negative power supply from a single supply PVDD. A flying capacitor for the charge pump shall be applied between CP and CN. At the same time a decoupling capacitor shall be applied between PVSS and ground. Typical value for the flying capacitor is 0.33uF. Typical value of the decoupling capacitor shall be same as or larger than that of the flying capacitor. Low-ESR capacitors are recommended for the flying capacitor and the decoupling capacitor. Audio Signal Amplification Gain Setting The main application of the TPF632A/605A/607A is to amplify/buffer audio signals and drive audio lines with very low distortion. Typical application circuits with inverting gain are shown in Figure. 4. Non-inverting amplification of audio signals is also possible with same low distortion. -VIN RFB CIN RIN -VIN +VIN (a) CIN RIN CIN RIN (b) RFB RFB Figure 4 Typical Application Circuit of TPF632A 6 Rev. C www.3peakic.com TPF632A / TPF605A / TPF607A 3-VRMS Audio Line Driver with Integrated Charge Pump AC-Coupling Input Capacitors Because of the integrated charge pump that generates negative rail, TP632A/605A/607A may be used to amplify audio signal so the output DC voltage is 0V. This usually requires the DC voltage of the input signal to be 0V. If the input signal has a DC level other than 0V, an AC-coupling capacitor is necessary to block the DC voltage. The AC-coupling capacitor essentially forms a high-pass filter at the input. The cut-off frequency of the filter has to be low enough not to distort the input audio signal. For an inverting amplifier shown in Figure 4 the cut-off frequency may be calculated as following: 1 fc = 2 RINCIN (1) 1 2 RIN fc (2) If the required maximum cut-off frequency is known, the minimum AC-coupling capacitance can be determined: CIN Adding Low-Pass Filtering to the Gain If low-pass filtering is necessary in addition to the audio signal amplification, a second-order filter can be implemented as shown in Figure 5. Choice of C3, R1, R2, and R3 is based on the gain setting requirement and AC-coupling cut-off frequency as discussed above. C1, C2 and C4 may be calculated depending on the bandwidth. Example choices of R and C are listed in Table 1. If first-order filtering satisfies performance requirements, simply remove the C2 and C4 to lower the component counts. R3 R3 -VIN C3 R1 C1 R2 -VIN +VIN C2 C3 R1 C3 R1 (a) R2 C1 R2 C1 C4 R3 (b) Figure 5 Second-order filter with gain: (a) Single-ended input; (b) Differential input Table 1 Example RC setting at different gains Gain G=2 G=2.5 G=3.75 R1 R2 R3 C1 C2 C3 C4 576 549 1150 1nF 6.2nF 100uF 3.1nF 383 301 1430 1nF 9.1nF 100uF 4.5nF 576 412 1430 1nF 6.8nF 100uF 3.4nF Pop-Free Power Up and Power Down During power up or power down, the input device that provide audio source may experience significant DC level shift. Charging of the input capacitor due to DC shift will cause pop noise. It is recommended that TPF632A/605A/607A is disabled (EN low) during power up and power down and kept disabled until charging of the input capacitor is complete. The sequence of EN control is illustrated below. www.3peakic.com Rev. C 7 TPF632A / TPF605A / TPF607A 3-VRMS Audio Line Driver with Integrated Charge Pump Power EN Figure 6 The Sequence of EN Control Under-voltage Protection When unexpected power off happens, the host may not have enough time to disable TPF632A/605A/607A before pop noise is generated. The integrated under-voltage protection circuits can be used to mute and disable TPF632A/605A/607A when the monitored supply voltage drops below certain voltage. The recommended connection is shown below. VSUPPLY is the monitored supply voltage. The threshold voltage at the UVP pin is 1.23V. R3 sets the hysteresis voltage and is usually much larger than R1 and R2. The turn on threshold and hysteresis can be calculated: VTH = 1.23V x (R1+R2)/R2 (3) Hysteresis = 4.7uA x R3 x (R1+R2)/R2 when R3>>R1, R2 (4) (5) Vsupply R1 UVP R3 R2 Figure 7 Under-voltage Protection Circuits ESD TPF632A/605A/607A has reverse-biased ESD protection diodes on all inputs and outputs. be biased more than 300mV beyond either supply rail. Input and out pins can not Driving Large Capacitive Load TPF632A/605A/607A is designed to drive large capacitive loads up to 220pF directly. When driving larger capacitive loads with the TPF632A/605A/607A, a small series resistor at the output (RISO in Figure 8 ) improves the feedback loop's phase margin and stability by making the output load resistive at higher frequencies. Usually RISO of 50 is sufficient. 8 Rev. C www.3peakic.com TPF632A / TPF605A / TPF607A 3-VRMS Audio Line Driver with Integrated Charge Pump Figure 8 Driving Circuits Power Supply Layout and Bypass The power supply pin of TPF632A/605A/607A should have a local bypass capacitor (i.e., 0.01F to 0.1F) within 2mm for good high frequency performance. It can also use a bulk capacitor (i.e., 1F or larger) within 100mm to provide large, slow currents. This bulk capacitor can be shared with other analog parts. Ground layout improves performance by decreasing the amount of stray capacitance and noise at the OPA's inputs and outputs. To decrease stray capacitance, minimize PC board lengths and resistor leads, and place external components as close to the op amps' pins as possible. Proper Board Layout To ensure optimum performance at the PCB level, care must be taken in the design of the board layout. To avoid leakage currents, the surface of the board should be kept clean and free of moisture. Coating the surface creates a barrier to moisture accumulation and helps reduce parasitic resistance on the board. Keeping supply traces short and properly bypassing the power supplies minimizes power supply disturbances due to output current variation, such as when driving an ac signal into a heavy load. Bypass capacitors should be connected as closely as possible to the device supply pins. Stray capacitances are a concern at the outputs and the inputs of the amplifier. It is recommended that signal traces be kept at least 5mm from supply lines to minimize coupling. A variation in temperature across the PCB can cause a mismatch in the Seebeck voltages at solder joints and other points where dissimilar metals are in contact, resulting in thermal voltage errors. To minimize these thermocouple effects, orient resistors so heat sources warm both ends equally. Input signal paths should contain matching numbers and types of components, where possible to match the number and type of thermocouple junctions. For example, dummy components such as zero value resistors can be used to match real resistors in the opposite input path. Matching components should be located in close proximity and should be oriented in the same manner. Ensure leads are of equal length so that thermal conduction is in equilibrium. Keep heat sources on the PCB as far away from amplifier input circuitry as is practical. The use of a ground plane is highly recommended. A ground plane reduces EMI noise and also helps to maintain a constant temperature across the circuit board. www.3peakic.com Rev. C 9 TPF632A / TPF605A / TPF607A 3-VRMS Audio Line Driver with Integrated Charge Pump Package Outline Dimensions TSSOP-14 Symbol E1 E A A A2 D b 0.20 D 4.86 A2 E1 e L L1 L2 A1 - 0.05 E c MIN A1 c e Dimensions R In Millimeters TYP MAX - 0.15 - 0.28 4.96 5.06 - 0.90 1.00 0.10 - 6.20 4.30 0.45 0.09 0 6.40 4.40 0.65 BSC 0.60 1.00 REF 0.25 BSC - - 1.20 1.05 0.19 6.60 4.50 0.75 - 8 R1 R L1 10 Rev. C L L2 www.3peakic.com TPF632A / TPF605A / TPF607A Package Outline Dimensions 3-VRMS Audio Line Driver with Integrated Charge Pump MSOP-10-EP (EXPOSED PAD) Symbol A TYP MAX 1.10 A0 4.70 - 5.10 A2 0.75 0.85 0.95 0.08 0.15 A1 0.05 b 0.19 D 2.90 E1 2.90 c D1 E2 e L 0.40 0 L1 aaa bbb ccc ddd www.3peakic.com MIN Dimensions In Millimeters - - 0.15 0.28 0.23 3.00 3.10 3.30 3.10 1.80REF 1.55REF 0.50BSC - 0.70 - 8 0.95BSC 0.2 0.25 0.10 0.08 Rev. C 11 TPF632A / TPF605A / TPF607A 3-VRMS Audio Line Driver with Integrated Charge Pump Package Outline Dimensions MSOP-10 (NO EXPOSED PAD) Symbol A - 4.70 A2 0.75 0.85 0.08 0.15 0.05 b 0.19 D 2.90 E1 2.90 c D1 E2 e L 0.40 0 L1 aaa bbb ccc ddd Rev. C - TYP A0 A1 12 MIN Dimensions In Millimeters MAX 1.10 5.10 - 0.15 - 0.28 0.95 0.23 3.00 3.10 3.30 3.10 1.80REF 1.55REF 0.50BSC - 0.70 - 8 0.95BSC 0.2 0.25 0.10 0.08 www.3peakic.com