TPA2012D2 datasheet(20/43 Pages) TI2

20 / 43 page

InputSignal

Amplitue(Vrms)

GaindB

Attacktime

Releasetime

Timereset

Timeend

Holdtime

time

Holdtimernotusedafter

firstgainincrease

TPA2026D2

SLOS649B – MARCH 2010 – REVISED MAY 2016

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Successive gain decreases are never faster than the attack time. Successive gain increases are never faster

than the release time.

All time variables (attack, release, and hold) start counting after each gain change performed by the AGC. The

AGC is allowed to decrease the gain (attack) only after the attack time finishes. The AGC is allowed to increase

the gain (release) only after the release time finishes counting. However, if the preceding gain change was an

attack (gain increase) and the hold time is enabled and longer than the release time, then the gain is only

increased after the hold time.

The hold time is only enabled after a gain decrease (attack). The hold time replaces the release time after a gain

decrease (attack). If the gain needs to be increased further, then the release time is used. The release time is

used instead of the hold time if the hold time is disabled.

The attack time must be at least 100 times shorter than the release and hold time. The hold time must be the

same or greater than the release time. It is important to select reasonable values for those variables in order to

prevent the gain from changing too often or too slow.

Figure 41 illustrates the relationship between the three time variables.

Figure 41. Time Diagram Showing the Relation Between the Attack, Release, and Hold Time vs Input

Signal Amplitude and Gain

Figure 42 shows a state diagram of the input signal amplitude versus the output signal amplitude and a summary

of how the variables from Table 2 described in the preceding pages affect them.

TPA2012D2 Datasheet(PDF) 20 Page - Texas Instruments