Datasheet

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VOLUME OPERATION
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10
20
30
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Volume [Pin 18] - V
Volume - dB
BTL Volume
TPA6021A4
SLOS465 – JUNE 2005
The VOLUME pin controls the BTL volume when driving speakers, and the SE volume when driving
headphones. This pin is controlled with a dc voltage, which should not exceed V
DD
.
The output volume increases in discrete steps as the dc voltage increases and decreases in discrete steps as
the dc voltage decreases. There are a total of 32 discrete gain steps of the amplifier and range from -85 dB to 20
dB for BTL operation and -85 dB to 14 dB for SE operation.
A pictorial representation of the typical volume control can be found in Figure 24 .
Figure 24. Typical DC Volume Control Operation
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