TPA2016D2 datasheet(16/51 Pages) TI2

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Input signal initial amplitude - |Current input signal amplitude|

Output signal amplitude =

Compression ratio

-dBV

LargeFixedGain

Small

Fixed

Gain

-dBV

Increasing

Limiter

Level

Decreasing

Limiter

Level

LimiterLevel= 500mW

LimiterLevel= 630mW

= 400

LimiterLevel

TPA2016D2

SLOS524E – JUNE 2008 – REVISED MAY 2016

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•

Below the minimum supply voltage in order to avoid clipping

Figure 30 shows how the limiter level influences the input signal amplitude versus the output signal amplitude

state diagram.

Figure 30. Output Signal vs Input Signal State Diagram Showing Different Limiter Level Configurations

The limiter level and the fixed gain influence each other. If the fixed gain is set high, the AGC has a large limiter

range. The fixed gain is set low, the AGC has a short limiter range. Figure 31 illustrates the two examples:

Figure 31. Output Signal vs Input Signal State Diagram Showing Same Limiter Level Configurations With

Different Fixed Gain Configurations

9.3.4.3 Compression Ratio

The compression ratio sets the relation between input and output signal outside the limiter level region. The

compression ratio compresses the dynamic range of the audio. For example if the audio source has a dynamic

range of 60 dB and compression ratio of 2:1 is selected, then the output has a dynamic range of 30 dB. Most

small form factor speakers have small dynamic range. Compression ratio allows audio with large dynamic range

to fit into a speaker with small dynamic range.

The compression ratio also increases the loudness of the audio without increasing the peak voltage. The higher

the compression ratio, the louder the perceived audio.

For example:

•

A compression ratio of 4:1 is selected (meaning that a 4-dB change in the input signal results in a 1-dB signal

change at the output)

•

A fixed gain of 0 dB is selected and the maximum audio level is at 0 dBV.

When the input signal decreases to –32 dBV, the amplifier increases the gain to 24 dB in order to achieve an

output of –8 dBV. The output signal amplitude equation is:

(1)

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