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DIFFERENTIAL INPUT

SHUTDOWN MODES

USING LOW-ESR CAPACITORS

TPA2000D1

SLOS328F – JUNE 2000 – REVISED MARCH 2004

Increasing the bypass capacitor reduces clicking and popping noise from power on/off and entering and leaving

The differential input stage of the amplifier cancels any noise that appears on both input lines of the channel. To

use the TPA2000D1 EVM with a differential source, connect the positive lead of the audio source to the INP

input and the negative lead from the audio source to the INN input. To use the TPA2000D1 with a single-ended

source, ac ground the INN input through a capacitor and apply the audio single to the input. In a single-ended

input application, the INN input should be ac-grounded at the audio source instead of at the device input for best

noise performance.

minimum level during periods of nonuse for battery-power conservation. The SHUTDOWN input terminal should

be held high during normal operation when the amplifier is in use. Pulling SHUTDOWN low causes the outputs to

unconnected because amplifier operation would be unpredictable.

Low-ESR capacitors are recommended throughout this application section. A real (as opposed to ideal) 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.

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