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| TPA6102A2 50-mW FIXED-GAIN STEREO AUDIO POWER AMPLIFIER SLOS324 - JUNE 2000 D D D D D D D D D D 50 mW Stereo Output Low Supply Current . . . 0.75 mA Low Shutdown Current . . . 50 nA Minimal External Components Required Gain Set Internally to 14 dB Pop Reduction Circuitry Internal Mid-Rail Generation Thermal and Short-Circuit Protection Surface-Mount Packaging - MSOP - SOIC 1.6 to 3.6 Supply Voltage Range D PACKAGE (TOP VIEW) BYPASS GND SHUTDOWN IN2- 1 2 3 4 8 7 6 5 IN1- VO 1 VDD VO 2 DGK PACKAGE (TOP VIEW) BYPASS GND SHUTDOWN IN2- 1 2 3 4 8 7 6 5 IN1- VO 1 VDD VO 2 description The TPA6102A2 is a stereo audio power amplifier packaged in either an 8-pin SOIC package or an 8-pin MOSP package capable of delivering 50 mW of continuous RMS power per channel into 16- loads. Amplifier gain is internally set to 14 dB (inverting) to save board space by eliminating 6 external resistors. The TPA6102A2 is optimized for battery applications because of its low supply current, shutdown current, and THD+N. To obtain the low supply voltage range, the TPA6102A2 biases BYPASS to VDD/4. When driving a 16- load with 40 mW output power from 3.3 V, THD+N is 0.08% at 1 kHz, and less than 0.2% across the audio band of 20 Hz to 20 kHz. For 30 mW into 32- loads, the THD+N is reduced to less than 0.06% at 1 kHz, and is less than 0.3% across the audio band of 20 Hz to 20 kHz. typical application circuit VDD 6 Audio Input 8 IN 1- CI 1 BYPASS CB Audio Input 4 IN 2- CI From Shutdown Control Circuit 3 SHUTDOWN 100 k 20 k - + 100 k Bias Control 2 VO2 5 CC 100 k VDD/4 20 k 100 k - + VO1 7 CC VDD CS 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. This document contains information on products in more than one phase of development. The status of each device is indicated on the page(s) specifying its electrical characteristics. Copyright (c) 2000, Texas Instruments Incorporated POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 1 TPA6102A2 50-mW FIXED-GAIN STEREO AUDIO POWER AMPLIFIER SLOS324 - JUNE 2000 AVAILABLE OPTIONS TA - 40C to 85C PACKAGED DEVICE SMALL OUTLINE (D) TPA6102A2D MSOP (DGK) TPA6102A2DGK MSOP SYMBOLIZATION AJN Terminal Functions TERMINAL NAME BYPASS GND IN1- IN2- SHUTDOWN VDD VO1 VO2 NO. 1 2 8 4 3 6 7 5 I/O I I I I I I O O DESCRIPTION Tap to voltage divider for internal mid-supply bias supply. BYPASS is set at VDD/4. Connect to a 0.1 F to 1 F low ESR capacitor for best performance. GND is the ground connection. IN1- is the inverting input for channel 1. IN2- is the inverting input for channel 2. Active-low input. When held low, the device is placed in a low supply current mode. VDD is the supply voltage terminal. VO1 is the audio output for channel 1. VO2 is the audio output for channel 2. absolute maximum ratings over operating free-air temperature (unless otherwise noted) Supply voltage, VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 V Input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 0.3 V to VDD + 0.3 V Continuous total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internally Limited Operating junction temperature range, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 40C to 150C Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 65C to 150C Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260C Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. DISSIPATION RATING TABLE PACKAGE D DGK TA 25C POWER RATING 710 mW 469 mW DERATING FACTOR ABOVE TA = 25C 5.68 mW/C 3.75 mW/C TA = 70C POWER RATING 454 mW 300 mW TA = 85C POWER RATING 369 mW 244 mW recommended operating conditions AAA A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAA MIN MAX UNIT V C Supply voltage, VDD 1.6 3.6 85 Operating free-air temperature, TA - 40 2 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 TPA6102A2 50-mW FIXED-GAIN STEREO AUDIO POWER AMPLIFIER SLOS324 - JUNE 2000 dc electrical characteristics at TA = 25C, VDD = 3.3 V PARAMETER PSRR IDD IDD(SD) |IIH| |IIL| ZI Power supply rejection ratio Supply current Supply current in SHUTDOWN mode High-level input current (SHUTDOWN) Low-level input current (SHUTDOWN) Input impedance VDD = 3.3 V, VI= VDD VDD = 3.3 V, VI= 0 V 20 TEST CONDITIONS VDD = 3 V to 3.6 V MIN TYP 72 0.75 50 1.2 250 1 1 MAX UNIT dB mA nA A A k ac operating characteristics, VDD = 3.3 V, TA = 25C, RL = 16 PARAMETER G PO THD+N BOM kSVR SNR Vn Gain Output power (each channel) Total harmonic distortion + noise Maximum output power BW Supply ripple rejection Signal-to-noise ratio Noise output voltage (no noise weighting filter) THD 0.1%, PO = 45 mW, THD < 0.5% f = 1 kHz PO = 50 mW f = 1 kHz 20-20 kHz TEST CONDITIONS MIN TYP 14 50 0.4% > 20 47 86 45 kHz dB dB V(rms) MAX UNIT dB mW ac operating characteristics, VDD = 3.3 V, TA = 25C, RL = 32 PARAMETER G PO THD+N BOM kSVR SNR Vn Gain Output power (each channel) Total harmonic distortion + noise Maximum output power BW Supply ripple rejection Signal-to-noise ratio Noise output voltage (no noise weighting filter) THD 0.1%, PO = 30 mW, THD < 0.4% f = 1 kHz PO = 30 mW f = 1 kHz 20-20 kHz TEST CONDITIONS MIN TYP 14 35 0.4% > 20 47 86 50 kHz dB dB V(rms) MAX UNIT dB mW POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 3 TPA6102A2 50-mW FIXED-GAIN STEREO AUDIO POWER AMPLIFIER SLOS324 - JUNE 2000 dc electrical characteristics at TA = 25C, VDD = 1.6 V PARAMETER PSRR IDD IDD(SD) |IIH| |IIL| ZI Power supply rejection ratio Supply current Supply current in SHUTDOWN mode High-level input current (SHUTDOWN) Low-level input current (SHUTDOWN) Input impedance VDD = 1.6 V, VI= VDD VDD = 1.6 V, VI= 0 V 20 TEST CONDITIONS VDD = 1.4 V to 1.8 V MIN TYP 80 0.65 50 1.2 250 1 1 MAX UNIT dB mA nA A A k ac operating characteristics, VDD = 1.6 V, TA = 25C, RL = 16 PARAMETER G PO THD+N BOM kSVR SNR Vn Gain Output power (each channel) Total harmonic distortion + noise Maximum output power BW Supply ripple rejection Signal-to-noise ratio Noise output voltage (no noise weighting filter) THD 0.5%, PO = 9.5 mW, THD < 1% f = 1 kHz PO = 10 mW f = 1 kHz 20-20 kHz TEST CONDITIONS MIN TYP 14 10 0.06% > 20 47 82 32 kHz dB dB V(rms) MAX UNIT dB mW ac operating characteristics, VDD = 1.6 V, TA = 25C, RL = 32 PARAMETER G PO THD+N BOM kSVR SNR Vn Gain Output power (each channel) Total harmonic distortion + noise Maximum output power BW Supply ripple rejection Signal-to-noise ratio Noise output voltage (no noise weighting filter) THD 0.5%, PO = 6.5 mW, THD < 1% f = 1 kHz PO = 7.5 mW f = 1 kHz 20-20 kHz TEST CONDITIONS MIN TYP 14 7.5 0.05% > 20 47 84 32 kHz dB dB V(rms) MAX UNIT dB mW 4 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 TPA6102A2 50-mW FIXED-GAIN STEREO AUDIO POWER AMPLIFIER SLOS324 - JUNE 2000 APPLICATION INFORMATION input capacitor, CI In the typical application, an input capacitor, CI, is required to allow the amplifier to bias the input signal to the proper dc level for optimum operation. In this case, CI and RI form a high-pass filter with the corner frequency determined in equation 1. RI is set internally and is fixed at 20 k. fc 1 + 2 pR C II (1) The value of CI is important to consider, as it directly affects the bass (low frequency) performance of the circuit. Consider the example where the specification calls for a flat bass response down to 20 Hz. Equation 1 is reconfigured as equation 2. CI 1 + 2 pR fc I (2) In this example, CI is 0.40 F, so one would likely choose a value in the range of 0.47 F to 1 F. A further consideration for this capacitor is the leakage path from the input source through the input network (RI, CI) and the feedback resistor (RF) to the load. This leakage current creates a dc offset voltage at the input to the amplifier that reduces useful headroom. For this reason a low-leakage tantalum or ceramic capacitor is the best choice. When polarized capacitors are used, the positive side of the capacitor should face the amplifier input in most applications, as the dc level there is held at VDD/4, which is likely higher than the source dc level. It is important to confirm the capacitor polarity in the application. power supply decoupling, CS The TPA6102A2 is a high-performance CMOS audio amplifier that requires adequate power supply decoupling to ensure that the output total harmonic distortion (THD) is as low as possible. Power supply decoupling also prevents oscillations for long lead lengths between the amplifier and the speaker. The optimum decoupling is achieved by using two capacitors of different types that target different types of noise on the power supply leads. For higher frequency transients, spikes, or digital hash on the line, a good low equivalent-series-resistance (ESR) ceramic capacitor, typically 0.1 F, placed as close as possible to the device VDD lead, works best. For filtering lower-frequency noise signals, a larger aluminum electrolytic capacitor of 10 F or greater placed near the power amplifier is recommended. midrail bypass capacitor, CB The midrail bypass capacitor, CB, serves several important functions. During startup, CB determines the rate at which the amplifier starts up. This helps to push the start-up pop noise into the subaudible range (so low it can not be heard). The second function is to reduce noise produced by the power supply caused by coupling into the output drive signal. This noise is from the midrail generation circuit internal to the amplifier. The capacitor is fed from a 55-k source inside the amplifier. To keep the start-up pop as low as possible, the relationship shown in equation 3 should be maintained. CB 1 55 k v 1 CI RI (3) As an example, consider a circuit where CB is 1 F, CI is 1 F, and RI is 20 k. Inserting these values into the equation 3 results in: 18.18 50 which satisfies the rule. Bypass capacitor, CB, values of 0.47 F to 1 F ceramic or tantalum low-ESR capacitors are recommended for the best THD and noise performance. POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 5 TPA6102A2 50-mW FIXED-GAIN STEREO AUDIO POWER AMPLIFIER SLOS324 - JUNE 2000 APPLICATION INFORMATION output coupling capacitor, CC In the typical single-supply single-ended (SE) configuration, an output coupling capacitor (CC) is required to block the dc bias at the output of the amplifier, thus preventing dc currents in the load. As with the input coupling capacitor, the output coupling capacitor and impedance of the load form a high-pass filter governed by equation 4. fc + 2 pR1 C LC (4) The main disadvantage, from a performance standpoint, is that the typically small load impedances drive the low-frequency corner higher. Large values of CC are required to pass low frequencies into the load. Consider the example where a CC of 68 F is chosen and loads vary from 32 to 47 k. Table 1 summarizes the frequency response characteristics of each configuration. Table 1. Common Load Impedances Vs Low Frequency Output Characteristics in SE Mode RL 32 10,000 47,000 CC 68 F 68 F 68 F Lowest Frequency 73 Hz 0.23 Hz 0.05 Hz As Table 1 indicates, headphone response is adequate and drive into line level inputs (a home stereo for example) is very good. The output coupling capacitor required in single-supply SE mode also places additional constraints on the selection of other components in the amplifier circuit. With the rules described earlier still valid, add the following relationship: CB 1 55 k v 1 CI RI 1 R LC C (5) using low-ESR capacitors Low-ESR capacitors are recommended throughout this application. A real capacitor can be modeled simply as a resistor in series with an ideal capacitor. The voltage drop across this resistor minimizes the beneficial effects of the capacitor in the circuit. The lower the equivalent value of this resistance, the more the real capacitor behaves like an ideal capacitor. 3.3-V versus 1.6-V operation The TPA6102A2 was designed for operation over a supply range of 1.6 V to 3.6 V. There are no special considerations for 1.6-V versus 3.3-V operation as far as supply bypassing, gain setting, or stability. Supply current is slightly reduced from 0.75 mA (typical) to 0.65 mA (typical). The most important consideration is that of output power. Each amplifier can produce a maxium output voltage swing within a few hundred millivolts of the rails with a 10-k load. However, this voltage swing decreases as the load resistance decreases and the rDS(on) as the output stage transistors becomes more significant. For example, for a 32- load, the maximum peak output voltage with VDD = 1.6 V is approximately 0.7 V with no clipping distortion. This reduced voltage swing effectively reduces the maximum undistorted output power. 6 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 TPA6102A2 50-mW FIXED-GAIN STEREO AUDIO POWER AMPLIFIER SLOS324 - JUNE 2000 MECHANICAL DATA D (R-PDSO-G**) 14 PIN SHOWN PLASTIC SMALL-OUTLINE PACKAGE 0.050 (1,27) 0.020 (0,51) 0.014 (0,35) 14 8 0.008 (0,20) NOM 0.244 (6,20) 0.228 (5,80) 0.157 (4,00) 0.150 (3,81) 0.010 (0,25) M Gage Plane 0.010 (0,25) 1 A 7 0- 8 0.044 (1,12) 0.016 (0,40) Seating Plane 0.069 (1,75) MAX 0.010 (0,25) 0.004 (0,10) 0.004 (0,10) PINS ** DIM A MAX 8 0.197 (5,00) 0.189 (4,80) 14 0.344 (8,75) 0.337 (8,55) 16 0.394 (10,00) 0.386 (9,80) 4040047 / D 10/96 A MIN NOTES: A. All linear dimensions are in inches (millimeters). B. This drawing is subject to change without notice. C. Body dimensions do not include mold flash or protrusion, not to exceed 0.006 (0,15). POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 7 TPA6102A2 50-mW FIXED-GAIN STEREO AUDIO POWER AMPLIFIER SLOS324 - JUNE 2000 MECHANICAL INFORMATION DGK (R-PDSO-G8) 0,38 0,25 8 5 PLASTIC SMALL-OUTLINE PACKAGE 0,65 0,25 M 0,15 NOM 3,05 2,95 4,98 4,78 Gage Plane 0,25 1 3,05 2,95 4 0- 6 0,69 0,41 Seating Plane 1,07 MAX 0,15 0,05 0,10 4073329/B 04/98 NOTES: A. B. C. D. All linear dimensions are in millimeters. This drawing is subject to change without notice. Body dimensions do not include mold flash or protrusion. Falls within JEDEC MO-187 8 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. Customers are responsible for their applications using TI components. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI's publication of information regarding any third party's products or services does not constitute TI's approval, warranty or endorsement thereof. Copyright (c) 2000, Texas Instruments Incorporated |
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