MSM7557 Ver la hoja de datos (PDF) - Oki Electric Industry

Número de pieza

componentes Descripción

Fabricante

MSM7557

Single Chip MSK Modem with Compandor for Cordless Telephone

Oki Electric Industry 

¡ Semiconductor

MSM7557

(Continued)

Name

Function

Power down control.

Power down state is controlled by PDN, ME, RVE, and TVE.

Voice control Transmit side Receive side

PDN ME RVE TVE

path

modem

modem

Mode1 1

X

0

X

OFF

OFF

OFF

PDN

Mode2 1

X

1

X

OFF

OFF

ON

Mode3 0

1

0

0

OFF

ON

ON

Mode4

others

ON

ON

ON

X : Don't care

At the mode 4, all functions are powered on.

At the full power down mode(PDN = "1" and RVE = "0"), the demodulator circuit and FD pin are reset.

When VDD is turned ON, the demodulator circuit and FD pin should be reset by setting Mode1.

Crystal connection.

X1 3.6864 MHz crystal shall be connected.

X2 When an external master clock is applied, the clock should be supplied to X2 pin via a 200 pF capacitor for

AC coupling and X1 should be opened.

MSK moudulator output.

ME When digital "1" is applied to this pin, MSK modulator is connected to the splatter filter.

Refer to TAO pin description.

Transmit side voice signal contorol.

TVE

Refer to TAO pin description.

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