MSM7532 View Datasheet(PDF) - Oki Electric Industry

Part Name

Description

Manufacturer

MSM7532

Single Chip MSK Modem with Compandor for Cordless Telephone

Oki Electric Industry 

¡ Semiconductor

MSM7532

CC3P, CC3N

Pins used to connect a capacitor for defining a time constant of output transient response for the

compressor.

Insert a 0.22 mF capacitor between CC3N and CC3P.

CC2, CC1

Pins used to connect capacitors for removing DC offset in the compressor.

Insert a 0.22 mF capacitor between CC2 and SGO, and between CC1 and SGO.

VREF

Output pin for internal reference voltage source.

The VREF output voltage is VSG +0.5 V.

The voltages into which the voltage between VREF pin and SGO pin is divided by the resistors should

be supplied to the LIML, MODL, and CPDL pin, respectively.

The VREF pin can be directly connected to the LIML pin, MODL pin, or CPDL pin.

Limiter

MOD

Compressor

Expander

VREF

LIML R3 R5 R7

MODL

CPDL

SGO R4 R6 R8

MODL

DC voltage input pin used to define a transmit output level for MODEM.

One of the voltages into which the voltage between VREF pin and SGO pin is divided by the resistors

should be supplied to this pin.

Refer to the VREF description for voltage division by the resistors.

If the potential difference between this pin and the SGO pin is VMODL (V), the TAO output level is

expressed as follows.

VOX = 20 · log (VMODL) + 0.5 (dBV)

GND

Ground pin (0V).

LIML

Clamp voltage input pin for deviation limiter.

The voice signal maximum RF modulation can be controlled by supplying, to this pin, one of the

voltages into which the voltage between VREF pin and SGO pin is divided by the resistors.

Refer to the VREF description for voltage division by the resistors.

If the potential difference between this pin and the SGO pin is VLIML (V), the limiter level is expressed

as follows.

VLIML = 20 · log (VLIML) – 3.0 (dBV)

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