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TPA0213DGQR Datasheet(PDF) 10 Page - Texas Instruments |
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TPA0213DGQR Datasheet(HTML) 10 Page - Texas Instruments |
10 / 24 page TPA0213 2-W MONO AUDIO POWER AMPLIFIER WITH HEADPHONE DRIVE SLOS276D – JANUARY 2000 – REVISED NOVEMBER 2002 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 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 the input resistance of the amplifier, RI, form a high-pass filter with the corner frequency determined in equation 4. f c(highpass) + 1 2 pR I C i –3 dB fc (4) 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 710 kΩ and the specification calls for a flat bass response down to 40 Hz. Equation 2 is reconfigured as equation 5. C i + 1 2 pR I fc (5) In this example, CI is 5.6 nF so one would likely choose a value in the range of 5.6 nF to 1 µF. A further consideration for this capacitor is the leakage path from the input source through the input network (Ci) and the feedback network 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. 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/2, which is likely higher than the source dc level. Note that it is important to confirm the capacitor polarity in the application. power supply decoupling, C(S) The TPA0213 is a high-performance CMOS audio amplifier that requires adequate power supply decoupling to ensure 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 audio power amplifier is recommended. midrail bypass capacitor, C(BYP) The midrail bypass capacitor, C(BYP), is the most critical capacitor and serves several important functions. During start-up or recovery from shutdown mode, C(BYP) determines the rate at which the amplifier starts up. 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, which appears as degraded PSRR and THD+N. Bypass capacitor, C(BYP), values of 0.47 µF to 1 µF ceramic or tantalum low-ESR capacitors are recommended for the best THD and noise performance. |
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