TPA2016D2 datasheet(18/51 Pages) TI2

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time

NoiseGateThreshold

Audio

Gaindoesnotchange

inthisregion

- dBV

Large Limiter

Range

Small

Compression

Region

Large

Compression

Region

Small Limiter

Range

Rotation

Point @

lower gain

Rotation

Point @

higher gain

TPA2016D2

SLOS524E – JUNE 2008 – REVISED MAY 2016

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1. Small limiter range yielding a large compression region (small fixed gain).

2. Large limiter range yielding a small compression region (large fixed gain).

Figure 33. Output Signal vs Input Signal State Diagram Showing the Effects of the Limiter Range to the

Compression Region

9.3.4.5 Noise Gate Threshold

The noise gate threshold prevents the AGC from changing the gain when there is no audio at the input of the

amplifier. The noise gate threshold stops gain changes until the input signal is above the noise gate threshold.

Select the noise gate threshold to be above the noise but below the minimum audio at the input of the amplifier

signal. A filter is needed between delta-sigma CODEC/DAC and TPA2016D2 for effectiveness of the noise gate

function. The filter eliminates the out-of-band noise from delta-sigma modulation and keeps the CODEC/DAC

output noise lower than the noise gate threshold.

Figure 34. Time Diagram Showing the Relationship Between Input Signal Amplitude, Noise Gate

Threshold and Gain Versus Time

9.3.4.6 Maximum Gain

This variable limits the number of gain steps in the AGC. This feature is useful in order to accomplish a more

advanced output signal vs input signal transfer characteristic.

For example, to prevent the gain from going above a certain value, reduce the maximum gain.

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