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MSM7540L

Single Rail ADPCM CODEC

Oki Electric Industry 

¡ Semiconductor

MSM7540L/7560L

PCMSI

Transmit PCM data input.

This signal is converted to transmit ADPCM data. PCM is shifted in synchronization with the

falling edge of BCLKB. Normally, this pin is connected to PCMSO.

PCMRO

Receive PCM data output.

PCM is the output signal after ADPCM decoder processing. This signal is output serially from

MSB in synchronization with the rising edge of BCLKB and RSYNC.

PCMRI

Receive PCM data input.

PCM is shifted on the falling edge of the BCLKB input from MSB. Normally, this pin is connected

to PCMRO.

IS

Transmit ADPCM signal output.

After having encoded PCM with ADPCM, this signal is output from MSB in synchronization

with the rising edge of BCLKA and XSYNC. This pin is an open drain output and remains in a

high impedance state during power-down. IS requires a pull-up resistor.

IR

Receive ADPCM signal input.

The ADPCM signal is shifted in series and synchronization with the falling edge of BCLKA and

RSYNC and output from MSB.

BCLKB

Shift clock input for the PCM data (PCMSO, PCMSI, PCMRO, PCMRI).

The frequency is set in the 64 kHz to 2048 kHz range.

XSYNC

8 kHz synchronous signal input for transmit PCM and ADPCM data.

Synchronize this signal with BCLKA and BCLKB signal. XSYNC is used to indicate the MSB of

the serial PCM and ADPCM data stream.

Be sure to input the XSYNC signal because it is also used as the imput of the timing generator.

RSYNC

8 kHz synchronous signal input for receive PCM and ADPCM data.

Synchronize this signal with BCLKA and BCLKB signal. RSYNC is used to indicate the MSB of

the serial PCM and ADPCM data stream.

BCLKA

Shift clock input for the ADPCM data (IS, IR).

The frequency is set in the of 32 kHz to 2048 kHz range.

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