Datasheet

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SLES014B − OCTOBER 2001 − REVISED AUGUST 2002
13
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functional description (continued)
V
COM
output
One unbuffered common-mode voltage output pin, V
COM
(pin 14) is brought out for decoupling purposes. This
pin is nominally biased to a dc voltage level equal to V
CC
/2. If this pin is to be used to bias external circuitry, a
voltage follower is required for buffering purposes. Figure 8 shows an example of using the V
COM
pin for external
biasing applications.
14
PCM1606
V
BIAS
[
V
CC
2
4
V
COM
3
1
OPA337
−
+
10 µF
+
Figure 8. Biasing External Circuits Using the V
COM
Pin
zero flag
zero detect condition
Zero detection for each output channel is independent from the others. If the data for a given channel remains
at a 0 level for 1024 sample periods (or LRCK clock periods), a zero detect condition exists for that channel.
zero output flag
When the data for all channels remains at a 0 level for 1024 sample periods (or LRCK clock periods), the ZEROA
(pin 6) is set to a logic 1 state. The zero flag pin can be used to operate external mute circuits, or used as a status
indicator for a microcontroller, audio signal processor, or other digitally controlled functions.