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The TPA0152 Audio Power Amplifier Evaluation Module
Pushbuttons S2 (UP) and S3 (DOWN) adjust the amount gain in the initial
stage of the amplifier, which could be considered the preamplifier stage. As a
result, the total harmonic distortion (THD) changes very little over all volume
levels. At power up, this gain is set at the lowest level, –85 dB, or mute. Each
time a button is pressed, the volume changes by one increment. If a button is
held in the depressed position, the volume changes by one increment every
four clock cycles, followed by a short delay. This delay decreases the longer
the button is depressed, eventually reaching a delay of zero. Table 3–1 shows
the volume control steps.
Table 3–1. TPA0152 EVM Gain Settings
CONTROL
CONTROL
3-6
VOLUME
(dB)
20
18
16
14
12
10
8
6
4
2
0
–2
–4
–6
UP
UP
–8
–10
–12
DOWN
DOWN
–14
–16
–18
–20
–22
–24
–26
–28
–30
–32
–34
–36
–38
–40
–85
MUTE (Initial/power up level)
VOLUME
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