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MSM7532

Single Chip MSK Modem with Compandor for Cordless Telephone

Oki Electric Industry 

¡ Semiconductor

MSM7532

MICO, MICN, MICP

MICN is the microphone amplifier inverting input pin, MICP is the non-inverting input pin, and

MICO is the output pin. Only during power down mode 1 or 2, the amplifier is powered down and

the MICO potential is undefined.

These pins can also be used for applications other than microphone amplifier.

VDD Output

MICO

MICN

–

+

MICP

CMPI

Input pin to the compressor.

Connect this pin to the TVIO pin with a 0.1 mF capacitor in order to prevent the malfunction of the

compressor which may occur if DC input offset exists.

TAO

Transmit analog signal output pin.

According to control data on ME and TVE, TAO is set as shown below.

ME TVE

TAO

Note

0

0 No signal output (potential = VSG)

SW6

0

1 Voice signal output (signal from TVI, TVIO)

SW5

1

X MSK modulator output

X: Don't care

UAI, UAO

Inverting input pin (UAI) and output pin (UAO) for the amplifier available for users.

These pins are used as a gain control amplifier that can match the internal signal level of the LSI with

the input level of the radio circuit.

The amplifier can drive a resistance over 2 kW.

In the power down mode 1 and 2, the amplifier enters power down mode.

Since the amplifier uses the power supply for the built-in transmitter, the amplifier should be used

to control signals for the transmitter. C28 is a capacitor for oscillation prevention. Be sure to use a

capacitor of 20 pF or more. If this amplifier is not used, connect UAI to UAO directly and remove R1,

R2, C1, and C28.

C1

R1

R2

C28

UAO

UAI

+

–

TAO

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