MSM7540 데이터 시트보기 (PDF) - Oki Electric Industry

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MSM7540

Single Rail ADPCM CODEC

Oki Electric Industry 

¡ Semiconductor

MSM7540/7560

PCMSI

Transmit PCM data input.

This signal is converted to the 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 and 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, starting with 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 input 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 range of 32 kHz to 2048 kHz.

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