TPA6021A4 Datasheet, PDF (15/26 Pages) Texas Instruments – 2-W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL

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TPA6021A4
SLOS465 – JUNE 2005
VOLUME OPERATION
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.
30
20
10
0 ^{BTL Volume}
-10
-20
-30
-40
-50
-60
-70
-80
-90
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Volume [Pin 18] - V
Figure 24. Typical DC Volume Control Operation
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