MSM7532 Ver la hoja de datos (PDF) - Oki Electric Industry

Número de pieza

componentes Descripción

Fabricante

MSM7532

Single Chip MSK Modem with Compandor for Cordless Telephone

Oki Electric Industry 

¡ Semiconductor

MSM7532

TVI, TVIO

Pins used to constitute an RC-active filter on the transmit input side.

If input signals have frequency components over 50 kHz, these components are output as aliasing

noises from the built-in SCF circuit. In order to remove these noises, insert the first or second order

RC-active filter with about 10 kHz cut-off frequency, as shown below.

<Second order RC-active filter configuration>

C5 R9 R11 C4

C7

C6

R10

CMPI

TVIO

TVI

–

+

SGO

Compressor

VTVI

C4, C5 for DC cutoff

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

R9 = R10 = R11 = 68 kW

C5 = 0.22 mF, C6 = 510 pF, C7 = 110 pF

<First order RC-active filter configuration>

C5 R32

C26 C4

R33

CMPI

TVIO

TVI

–

+

Compressor

VTVI

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

R32 = R33 = 51 kW

C5 = 0.22 mF, C26 = 300 pF

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