MSM7582B Ver la hoja de datos (PDF) - Oki Electric Industry

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MSM7582B

π/4 Shift QPSK MODEM

Oki Electric Industry 

¡ Semiconductor

MSM7582/7582B

MCK

Master clock input.

The clock frequency is 19.2 MHz.

IFIN

Modulated signal input for the demodulator block.

Select the IF frequency from 1.2 MHz, 10.7 MHz, 10.75 MHz, and 10.8 MHz, based on CR0 – B4

and B3.

IFCK

Clock signal input for demodulator block IF frequencies (10.7 MHz or 10.75 MHz).

If the IF frequency is 10.7 MHz, 19.0222 MHz should be supplied. When it is 10.75 MHz, 19.1111

MHz should be supplied. When the IF frequency is 1.2 MHz or 10.8 MHz, set this pin to “0” or

“1”. (Refer to Fig. 2.)

X1, X2

Crystal oscillator connection pins.

When supplying a 19.0222 MHz or 19.1111 MHz clock to IFCK, use these pins (Refer to Fig. 2.)

When IFIN = 10.7 MHz or 10.75 MHz

When IFIN = 1.2 MHz or 10.8 MHz

MSM7582/7582B

X1 X2 IFCK

MSM7582/7582B

X1 X2 IFCK

19.0222 MHz or 19.1111 MHz

Figure 2 How to Use IFCK, X1, and X2

RXD, RXC

Receive data and clock output. When power is turned on, the outputs of circuits selected by SLS1

and SLS2 appear at these pins. (Refer to Fig. 3)

RXD1

RXC

SLS2

SLS1

The recovery data and clock pulse are selected

asynchronously using the SLS signals.

Figure 3 RXD and RXC Timing Diagram

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