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MSM7575GS-BK

Multi-Function PCM CODEC

Oki Electric Industry 

¡ Semiconductor

MSM7575

SG, SGB

Analog signal ground output.

The output voltage is about 1.4 V. The bypass capacitors (10 µF in parallel with 0.1 µF ceramic

type) should be put between this pin and AG to get the specified noise characteristics. This

output voltage is 0 V during power-down.

AG

Analog ground.

DG

Digital ground.

This ground is separated from the analog signal ground(AG) in this device. The DG pin must be

kept as close to the AG pin possible on the PCB.

VDD

+3 V power supply.

PDN/RESET

Power down and reset control input.

“L” level makes the whole chip enter to power down state, and, at the same time, all of control

register data are reset to the initial state. Set this pin to “H” level during normal operating mode.

The power down state is controlled by a logical OR with CR0-B5 of the control register. When

using the pin PDN/RESET for the power down and reset control, CR0-B5 should be set to digital

“0”.

MCK

Master clock input.

The frequency must be 9.6 MHz or 19.2 MHz. The applied clock frequency is selected by the

control register data CR0-B6. The master clock signal is allowed to be asynchronous with BCLK,

XSYNC, and RSYNC.

PCMSO

Transmit PCM data output.

This PCM output signal is output from MSB in synchronization with the rising edge of BCLK or

XSYNC. A pull-up resistor must be connected to this pin, because this output is configuared as

an open drain.

During power down, this output is at high impedance state.

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