MSM7717 데이터 시트보기 (PDF) - Oki Electric Industry

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MSM7717

Single Rail CODEC

Oki Electric Industry 

¡ Semiconductor

MSM7717-01/02/03

PWI, AOUT+, AOUT–

PWI is connected to the inverting input of the receive driver.

The receive driver output is connected to the AOUT– pin. Therefore, the receive level can be

adjusted with the pins VFRO, PWI, and AOUT–. When the PWI pin is not used, the PWI pin to

the AOUT– pin, and leave the pins AOUT– and AOUT+ open. The output of AOUT+ is inverted

with respect to the output of AOUT–. Since these outputs provide differential drive of an

impedance of 1.2 kW, these outputs can directly be connected to a receiver of handset using a

piezoelectric earphone. Refer to the application example. Since the driver amplifiers are being

activated during the power-saving mode, the amplifiers can output other external signals from

AOUT+ and AOUT– pins. AOUT+ and AOUT– outputs are in a high impedance state during

the power-down mode.

VI

External Signal Input

Receive filter

–

SG +

VFRO

PWI

AOUT–

R6

R7

Analog output

–

SG +

VO ZL ZL > 1.2 kW

AOUT+

Analog inverted output

R6 > 20 kW

Gain = VO/VI = R7/R6 £ 1

VDD

Power supply for 2.7 V to 3.8 V. (Typically 3.0 V)

PCMIN

PCM data input.

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

RSYNC signal and BCLK signal.

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

PCM signal is shifted in 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, or 2048

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

saving state.

The power-saving state means that the reference voltage generator (VRGEN), PLL, and receive

driver amplifiers are in the operating mode and the other circuits are in the non-operating mode.

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