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.