Datasheet

PCM3008
SLAS332 – APRIL 2001
14
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TYPICAL CHARACTERISTICS
system clock
Dynamic performance may be influenced by the quality of SYSCK. Therefore the duty cycle, jitter and threshold
voltage at the SYSCK pin must be carefully managed. The SYSCK and BCK, LRCK must be supplied whenever
the power is applied and either PDAD
or ODDA is HIGH, as the PCM3008 uses dynamic circuits internally.
reset control
The PCM3008 does not have an internal power-on reset circuit. Therefore external reset control by PDAD
and
PDDA
must always done at least once after the power is turned on. If neither PDAD nor PDDA is needed in the
application, the standard reset circuit which consists of one resistor, one capacitor and one diode is
recommended on PDAD
and PDDA pins.
external mute control
Although the PCM3008 has an internal muting function for power-down ON/OFF control, if external muting
control is required, the recommended control sequence is described by External Mute ON, CODEC Power
Down ON, SYSCK stop and resume if necessary, CODEC Power Down OFF and External Mute OFF.