Datasheet

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LOW SUPPLY VOLTAGE POP
INN
1 M
1 M
1 M
1 M
V
DD
V
DD
INP
TPA2000D1
+
−
Audio In
TPA2000D1
SLOS328F – JUNE 2000 – REVISED MARCH 2004
The TPA2000D1 pops when coming out of shutdown at low supply voltages (3.3 V and less) when using the
application schematic shown above. The pops occur because the common-mode input range is worse at the
lower supply voltages. At low supply voltages, the inputs are not within the common-mode input range when
coming out of shutdown. The outputs develop an offset voltage until the inputs settle within the common-mode
input range. This causes a pop. Figure 12 shows 1-MΩ resistors added to form voltage dividers. The voltage
dividers bias the inputs to V
DD
/2 that keeps the pop low at turn on and when coming out of shutdown. The
resistors should be 1% tolerance to ensure the offset voltage is not increased.
Figure 12. Voltage Dividers
16