MSM7532GS-2K 데이터 시트보기 (PDF) - Oki Electric Industry

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MSM7532GS-2K

Single Chip MSK Modem with Compandor for Cordless Telephone

Oki Electric Industry 

¡ Semiconductor

MSM7532

CE1, CE2

Pins used to connect a capacitor for removing DC offset in the expander.

Insert a 0.22 mF capacitor between CE1 and SGO, an 1 mF capacitor between CE2 and SGO.

EMP

Emphasis path selection pin.

EMP

0

1

Transmit side

Pre-emphasis circuit is bypassed to the path

Pre-emphasis circuit is connected to the path

Receive side

De-emphasis circuit is bypassed to the path

De-emphasis circuit is connected to the path

Note

SW2

RAIO, RAI

Pins used to constitute RC-active filter on the receive signal input side.

Refer to the TVIO and TVI description.

If the Scrambler circuit is used, using the first order RC-active filter is recommended. In this case,

configure the filter so that either R34 or R35, or both of them, is 60 kW or less.

<First order RC-active filter configuration>

C19 R34

C27

R35

RAIO

RAI

–

+

VRAI

In the case of fc = 10 kHz, gain : 0dB

R34 = R35 = 51 kW

C19 = 0.22 mF, C27 = 300 pF

RVO

Receive voice signal output pin.

The RVO state is controlled depending on the digital data set to RVE.

RVE

RVO

Note

0 No signal output (voltage = VSG)

SW7

1 Output of signals input to RAI and RAIO

VOL1, VOL2

Pins used to set up a gain for the electronic volume.

The volume at the stage next to expander is controlled by the pins.

VOL2 VOL1 Gain

0

1 +6 dB

0

0 0 dB

1

1 –6 dB

1

0 –12 dB

CSH

Pin used to connect a capacitor for removing DC offset in shaper of modem receiver.

Insert a 1 mF capacitor between this pin and GND.

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