TPA6100A2 50-mW ULTRALOW VOLTAGE STEREO HEADPHONE AUDIO POWER AMPLIFIER SLOS269A – JUNE 2000 – REVISED NOVEMBER 2000 D D D D D D D D D D PACKAGE (TOP VIEW) 50-mW Stereo Output Low Supply Current . . . 0.75 mA Low Shutdown Current . . . 50 nA Pin Compatible With LM4881 and TPA102† Pop Reduction Circuitry Internal Mid-Rail Generation Thermal and Short-Circuit Protection Surface-Mount Packaging – MSOP – SOIC 1.6-V to 3.6-V Supply Voltage Range BYPASS GND SHUTDOWN IN2– 1 8 2 7 3 6 4 5 IN1– VO 1 VDD VO 2 DGK PACKAGE (TOP VIEW) BYPASS GND SHUTDOWN IN2– † The polarity of the SHUTDOWN pin is reversed. 1 8 2 7 3 6 4 5 description IN1– VO 1 VDD VO 2 The TPA6100A2 is a stereo audio power amplifier packaged in either an 8-pin SOIC package or an 8-pin MSOP package capable of delivering 50 mW of continuous RMS power per channel into 16-Ω loads. Amplifier gain is externally configured by a means of three resistors per input channel and does not require external compensation for settings of 1 to 10. The TPA6100A2 is optimized for battery applications because of its low supply current, shutdown current, and THD+N. To obtain the low-supply voltage range, the TPA6100A2 biases BYPASS to VDD/4. A resistor with a resistance equal to RF must be added from the inputs to ground to allow the output to be biased at VDD/2. When driving a 16-Ω load with 45-mW output power from 3.3 V, THD+N is 0.04% at 1 kHz, and less than 0.2% across the audio band of 20 Hz to 20 kHz. For 28 mW into 32-Ω loads, the THD+N is reduced to less than 0.03% at 1 kHz, and is less than 0.2% across the audio band of 20 Hz to 20 kHz. typical application circuit VDD 6 RF VDD/4 Audio Input RI 8 IN 1– 1 BYPASS 4 IN 2– R CI VDD CS – + VO1 7 – + VO2 5 CC CB Audio Input RI R CI From Shutdown Control Circuit 3 SHUTDOWN CC Bias Control 2 RF 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. Copyright 2000, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 1 TPA6100A2 50-mW ULTRALOW VOLTAGE STEREO HEADPHONE AUDIO POWER AMPLIFIER SLOS269A – JUNE 2000 – REVISED NOVEMBER 2000 AVAILABLE OPTIONS PACKAGED DEVICE TA SMALL OUTLINE (D) MSOP (DGK) MSOP SYMBOLIZATION TPA6100A2D TPA6100A2DGK AJL – 40°C to 85°C Terminal Functions TERMINAL NAME NO. I/O DESCRIPTION BYPASS 1 I Tap to voltage divider for internal mid-supply bias supply. BYPASS is set at VDD/4. Connect to a 0.1-µF to 1-µF low-ESR capacitor for best performance. GND 2 I GND is the ground connection. IN1– 8 I IN1– is the inverting input for channel 1. IN2– 4 I IN2– is the inverting input for channel 2. SHUTDOWN 3 I Active-low input. When held low, the device is placed in a low supply current mode. VDD VO1 6 I 7 O VDD is the supply voltage terminal. VO1 is the audio output for channel 1. VO2 5 O 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 40°C to 150°C Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C † 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 TA ≤ 25°C POWER RATING DERATING FACTOR ABOVE TA = 25°C TA = 70°C POWER RATING TA = 85°C POWER RATING D 710 mW 5.68 mW/°C 454 mW 369 mW DGK 469 mW 3.75 mW/°C 300 mW 244 mW ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ recommended operating conditions Supply voltage, VDD Operating free-air temperature, TA 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 MIN MAX UNIT 1.6 3.6 V – 40 85 °C TPA6100A2 50-mW ULTRALOW VOLTAGE STEREO HEADPHONE AUDIO POWER AMPLIFIER SLOS269A – JUNE 2000 – REVISED NOVEMBER 2000 dc electrical characteristics at TA = 25°C, VDD = 3.3 V PARAMETER TEST CONDITIONS PSRR Power supply rejection ratio IDD Supply current IDD(SD) Supply current in SHUTDOWN mode |IIH| High-level input current (SHUTDOWN) VDD = 3.3 V, VI= VDD |IIL| Low-level input current (SHUTDOWN) VDD = 3.3 V, VI= 0 V ZI Input impedance (IN1–, IN2–) MIN VDD = 3.0 V to 3.6 V TYP MAX 72 UNIT dB 0.75 1.2 mA 50 250 nA 1 µA 1 >1 µA MΩ ac operating characteristics, VDD = 3.3 V, TA = 25°C, RL = 16 Ω PARAMETER TEST CONDITIONS PO THD+N Output power (each channel) THD ≤ 0.1%, f = 1 kHz Total harmonic distortion + noise BOM kSVR Maximum output power BW PO = 45 mW, G = 1, THD < 0.5% Supply ripple rejection SNR Signal-to-noise ratio Vn Noise output voltage (no noise weighting filter) MIN TYP MAX 50 20–20 kHz UNIT mW 0.2% > 20 kHz f = 1 kHz 52 dB PO = 50 mW 90 dB 28 µV(rms) ac operating characteristics, VDD = 3.3 V, TA = 25°C, RL = 32 Ω PARAMETER TEST CONDITIONS PO THD+N Output power (each channel) THD ≤ 0.1%, f = 1 kHz Total harmonic distortion + noise 20–20 kHz BOM kSVR Maximum output power BW PO = 30 mW, G = 1, Supply ripple rejection SNR Signal-to-noise ratio Vn Noise output voltage (no noise weighting filter) POST OFFICE BOX 655303 THD < 0.2% MIN TYP 35 MAX UNIT mW 0.2% > 20 kHz f = 1 kHz 52 dB PO = 35 mW 91 dB 28 µV(rms) • DALLAS, TEXAS 75265 3 TPA6100A2 50-mW ULTRALOW VOLTAGE STEREO HEADPHONE AUDIO POWER AMPLIFIER SLOS269A – JUNE 2000 – REVISED NOVEMBER 2000 dc electrical characteristics at TA = 25°C, VDD = 1.6 V PARAMETER PSRR Power supply rejection ratio IDD TEST CONDITIONS MIN VDD = 1.5 V to 1.7 V TYP MAX UNIT 80 dB Supply current 1.2 mA IDD(SD) Supply current in SHUTDOWN mode 50 |IIH| High-level input current (SHUTDOWN) VDD = 1.6 V, VI= VDD |IIL| Low-level input current (SHUTDOWN) VDD = 1.6 V, VI= 0 V ZI Input impedance (IN1–, IN2–) 250 nA 1 µA 1 >1 µA MΩ ac operating characteristics, VDD = 1.6 V, TA = 25°C, RL = 16 Ω PARAMETER TEST CONDITIONS PO THD+N Output power (each channel) THD ≤ 0.1%, f = 1 kHz Total harmonic distortion + noise BOM kSVR Maximum output power BW PO = 9.5 mW, G = 0 dB, THD < 0.4% Supply ripple rejection SNR Signal-to-noise ratio Vn Noise output voltage (no noise weighting filter) MIN TYP MAX 9.5 20–20 kHz UNIT mW 0.4% > 20 kHz f = 1 kHz 53 dB PO = 9.5 mW 86 dB 18 µV(rms) ac operating characteristics, VDD = 1.6 V, TA = 25°C, RL = 32 Ω PARAMETER TEST CONDITIONS PO THD+N Output power (each channel) THD ≤ 0.1%, f = 1 kHz Total harmonic distortion + noise 20–20 kHz BOM kSVR Maximum output power BW PO = 6.5 mW, G = 0 dB, Supply ripple rejection SNR Signal-to-noise ratio Vn Noise output voltage (no noise weighting filter) 4 POST OFFICE BOX 655303 THD < 0.3% MIN TYP 7.1 MAX UNIT mW 0.3% > 20 kHz f = 1 kHz 53 dB PO = 7.1 mW 88 dB 18 µV(rms) • DALLAS, TEXAS 75265 TPA6100A2 50-mW ULTRALOW VOLTAGE STEREO HEADPHONE AUDIO POWER AMPLIFIER SLOS269A – JUNE 2000 – REVISED NOVEMBER 2000 APPLICATION INFORMATION gain setting resistors, RF, RI, and R ǒǓ ǒǓ The voltage gain for the TPA6100A2 is set by resistors RF and RI according to equation 1. Gain +* RF RI or Gain (dB) + 20 log RF RI (1) Given that the TPA6100A2 is a MOS amplifier, the input impedance is very high. Consequently input leakage currents are not generally a concern, although noise in the circuit increases as the value of RF increases. In addition, a certain range of RF values is required for proper start-up operation of the amplifier. Taken together it is recommended that the effective impedance seen by the inverting node of the amplifier be set between 5 kΩ and 20 kΩ. The effective impedance is calculated in equation 2. Effective Impedance + RRF)RRI F (2) I As an example, consider an input resistance of 20 kΩ and a feedback resistor of 20 kΩ. The gain of the amplifier would be – 1 and the effective impedance at the inverting terminal would be 10 kΩ, which is within the recommended range. For high performance applications, metal film resistors are recommended because they tend to have lower noise levels than carbon resistors. For values of RF above 50 kΩ, the amplifier tends to become unstable due to a pole formed from RF and the inherent input capacitance of the MOS input structure. For this reason, a small compensation capacitor of approximately 5 pF should be placed in parallel with RF. This, in effect, creates a low-pass filter network with the cutoff frequency defined in equation 3. fc + 2 p R1 C (3) F F For example, if RF is 100 kΩ and CF is 5 pF then fc is 318 kHz, which is well outside the audio range. For maximum signal swing and output power at low supply voltages like 1.6 V to 3.3 V, BYPASS is biased to VDD/4. However, to allow the output to be biased at VDD/2, a resistor, R, equal to RF must be placed from the negative input to ground. 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 4. fc + 2 p R1 C (4) I I The value of CI is important to consider, as it directly affects the bass (low frequency) performance of the circuit. Consider the example where RI is 20 kΩ and the specification calls for a flat bass response down to 20 Hz. Equation 4 is reconfigured as equation 5. CI + 2 p 1R fc (5) I POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 5 TPA6100A2 50-mW ULTRALOW VOLTAGE STEREO HEADPHONE AUDIO POWER AMPLIFIER SLOS269A – JUNE 2000 – REVISED NOVEMBER 2000 APPLICATION INFORMATION input capacitor, CI (continued) In this example, CI is 0.40 µF, so one would likely choose a value in the range of 0.47 µF to 1 µF. 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, especially in high-gain applications (>10). 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 TPA6100A2 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 µF, 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 µF 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-kΩ source inside the amplifier. To keep the start-up pop as low as possible, the relationship shown in equation 6 should be maintained. ǒ CB 1 55 kΩ 1 v Ǔ ǒC R Ǔ (6) I I As an example, consider a circuit where CB is 1 µF, CI is 1 µF, and RI is 20 kΩ. Inserting these values into the equation 6 results in: 18.18 ≤ 50 which satisfies the rule. Bypass capacitor (CB) values of 0.47-µF to 1-µF ceramic or tantalum low-ESR capacitors are recommended for the best THD and noise performance. 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 7. fc + 2 p R1 C (7) L C 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 µF is chosen and loads vary from 32 Ω to 47 kΩ. Table 1 summarizes the frequency response characteristics of each configuration. 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 TPA6100A2 50-mW ULTRALOW VOLTAGE STEREO HEADPHONE AUDIO POWER AMPLIFIER SLOS269A – JUNE 2000 – REVISED NOVEMBER 2000 APPLICATION INFORMATION Table 1. Common Load Impedances vs Low Frequency Output Characteristics in SE Mode RL CC 68 µF Lowest Frequency 32 Ω 10,000 Ω 68 µF 0.23 Hz 47,000 Ω 68 µF 0.05 Hz 73 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: ǒ CB 1 55 kΩ Ǔvǒ ǓƠ 1 CI RI 1 R LC C (8) 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 TPA6100A2 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-kΩ 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-Ω 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. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 7 TPA6100A2 50-mW ULTRALOW VOLTAGE STEREO HEADPHONE AUDIO POWER AMPLIFIER SLOS269A – JUNE 2000 – REVISED NOVEMBER 2000 MECHANICAL DATA D (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE 14 PIN SHOWN 0.050 (1,27) 0.020 (0,51) 0.014 (0,35) 14 0.010 (0,25) M 8 0.008 (0,20) NOM 0.244 (6,20) 0.228 (5,80) 0.157 (4,00) 0.150 (3,81) Gage Plane 0.010 (0,25) 1 7 0°– 8° A 0.044 (1,12) 0.016 (0,40) Seating Plane 0.069 (1,75) MAX 0.010 (0,25) 0.004 (0,10) PINS ** 0.004 (0,10) 8 14 16 A MAX 0.197 (5,00) 0.344 (8,75) 0.394 (10,00) A MIN 0.189 (4,80) 0.337 (8,55) 0.386 (9,80) DIM 4040047 / D 10/96 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). 8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 TPA6100A2 50-mW ULTRALOW VOLTAGE STEREO HEADPHONE AUDIO POWER AMPLIFIER SLOS269A – JUNE 2000 – REVISED NOVEMBER 2000 MECHANICAL INFORMATION DGK (R-PDSO-G8) PLASTIC SMALL-OUTLINE PACKAGE 0,38 0,25 0,65 8 0,25 M 5 0,15 NOM 3,05 2,95 4,98 4,78 Gage Plane 0,25 1 0°– 6° 4 3,05 2,95 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. 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