MSM7584C 데이터 시트보기 (PDF) - Oki Electric Industry

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MSM7584C

π/4 Shift QPSK MODEM/ADPCM CODEC

Oki Electric Industry 

¡ Semiconductor

MSM7584C

(Modem)

TXD

384 kbps transmit data input.

TXCI

Transmit clock input.

When the control register CR14 - B6 is "0", a 384 kHz clock pulse synchronous with TXD should

be input to this pin. This clock pulse should be continuous because this device use APLL to

generate an internal clock pulse.

When CR14 - B6 is "1", a 3.84 MHz clock pulse should be input to this pin. When the 3.84 MHz

clock pulse is applied, a 384 kHz clock pulse, which is generated by dividing the TXCI by 10, is

output to the TXCO pin. The transmit data, synchronous to the 384 kHz clock pulse, should be

input to the TXD. In this case the devices do not use APLL, and the 3.84 MHz clock pulse need

not be continuous. (Refer to Fig. 3)

TXCO

Transmit clock output.

When CR14 - B6 is "0", TXCO outputs the 384 kHz clock pulse (APLL output) for monitoring

purposes. When CR14 - B6 is "1", this pin outputs a 384 kHz clock pulse generated by dividing

the TXCI input by 10. (Refer to Fig. 3)

TXW

Transmit data window signal input.

The transmit timing signal for the burst data is input to this pin. If TXW is "1", the modulation

data is output. (Refer to Fig. 3)

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