MSM7508BRS Просмотр технического описания (PDF) - Oki Electric Industry

Номер в каталоге

Компоненты Описание

Список матч

MSM7508BRS

Single Rail CODEC

Oki Electric Industry 

¡ Semiconductor

MSM7508B/7509B

VDD

Power supply for +5 V.

PCMIN

PCM signal input.

A serial PCM signal input to this pin is converted to an analog signal in synchronization with the

RSYNC signal and BCLOCK signal.

The data rate of the PCM signal is equal to the frequency of the BCLOCK signal.

The PCM signal is shifted at a falling edge of the BCLOCK signal and latched into the internal

register when shifted by eight bits.

The start of the PCM data (MSD) is identified at the rising edge of RSYNC.

BCLOCK

Shift clock signal input for the PCMIN and PCMOUT signal.

The frequency, equal to the data rate, is 64, 96, 128, 192, 256, 384, 512, 768, 1024, 1536, 1544, or 2048

kHz. Setting this signal to logic "1" or "0" drives both transmit and receive circuits to the power

saving state.

RSYNC

Receive synchronizing signal input.

Eight required bits are selected from serial PCM signals on the PCMIN pin by the receive

synchronizing signal.

Signals in the receive section are synchronized by this synchronizing signal. This signal must be

synchronized in phase with the BCLOCK. The frequency should be 8 kHz ±50 ppm to guarantee

the AC characteristics which are mainly frequency characteristics of the receive section.

However, if the frequency characteristic of an applied system is not specified exactly, this device

can operate in the range of 8 to 10 kHz, but the electrical characteristics in this specification are

not guaranteed. Setting this signal to logic "1" or "0" drives both transmit and receive circuits to

the power saving state.

XSYNC

Transmit synchronizing signal input.

The PCM output signal from the PCMOUT pin is output in synchronization with this transmit

synchronizing signal. This synchronizing signal triggers the PLL and synchronizes all timing

signals of the transmit section.

This synchronizing signal must be synchronized in phase with BCLOCK.

The frequency should be 8 kHz ±50 ppm to guarantee the AC characteristics which are mainly

frequency characteristics of the transmit section.

However, if the frequency characteristic of an applied system is not specified exactly, this device

can operate in the range of 8 to 10 kHz, but the electrical characteristics in this specification are

not guaranteed.

Setting this signal to logic "1" or "0" drives both transmit and receive circuits to the power saving

state.

5/17

Share Link: