MSM7579 OKI, MSM7579 Datasheet - Page 5

• Manufacturer Part Number: MSM7579
• Description: (MSM7578) Single Rail CODEC
• Manufacturer: OKI

¡ Semiconductor
MSM7578H/7578V/7579
V
DD
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 BCLK signal.
The data rate of the PCM signal is equal to the frequency of the BCLK signal.
The PCM signal is shifted at a falling edge of the BCLK 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.
BCLK
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, 2048,
or 200 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 BCLK. The frequency should be 8 kHz 50 ppm to guarantee the
AC characteristics which are mainly the 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 kHz 2 kHz, but the electrical characteristics in this specification are
not guaranteed.
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 BCLK.
The frequency should be 8 kHz 50 ppm to guarantee the AC characteristics which are mainly
the 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 kHz 2 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.
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