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TPA721 Datasheet(PDF) 16 Page - Texas Instruments |
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TPA721 Datasheet(HTML) 16 Page - Texas Instruments |
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16 / 28 page  www.ti.com f co(lowpass) + 1 2p R F C F −3 dB fc (7) Input Capacitor, CI f co(highpass) + 1 2p R I C I −3 dB fc (8) C I + 1 2p R I fco (9) Power Supply Decoupling, CS TPA721 SLOS231E – NOVEMBER 1998 – REVISED JUNE 2004 For example, if RF is 100 kΩ and CF is 5 pF, then fco is 318 kHz, which is well outside of the audio range. 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 8. 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 10 kΩ and the specification calls for a flat bass response down to 40 Hz. Equation 8 is reconfigured as Equation 9. 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. 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. It is important to confirm the capacitor polarity in the application. The TPA721 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. 16 |
Similar Part No. - TPA721_16 |
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Similar Description - TPA721_16 |
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