Datasheet

Gain-dB
V -dBV
IN
TPA2017D2
www.ti.com ..................................................................................................................................................................................................... SLOS584 – APRIL 2009
Since the number of gain steps is limited the compression region is limited as well. The following figure shows
how the gain changes vs. the input signal amplitude in the compression region.
Figure 20. Input Signal Voltage vs Gain
Thus the AGC performs a mapping of the input signal vs. the output signal amplitude.
Pins AGC1 and AGC 2 are used to enable/disable the limiter, compression, and noise gate function. Table 1
shows each function.
Table 1. FUNCTION DEFINITION FOR AGC1 AND AGC2
AGC1 AGC2 Function
0 0 AGC Function disabled
0 1 AGC Limiter Function enabled
1 0 AGC, Limiter, and Compression Functions enabled
1 1 AGC, Limiter, Compression, and Noise Gate Functions enabled
The default values for the TPA2017D2 AGC function are given in Table 2 . The default values can be changed at
the factory during production. Refer to the TI representative for assistance with different default value requests.
Table 2. AGC DEFAULT VALUES
Attack Time 6.4 ms / step
Release Time 1.81 sec/step
Fixed Gain 6 dB
NoiseGate Threshold 20 mV
Output Limiter Level 9 dBV
Max Gain 30 dB
Compression Ratio 2:1
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Product Folder Link(s): TPA2017D2