MSM7524 Ver la hoja de datos (PDF) - Oki Electric Industry

Número de pieza

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Lista de partido

MSM7524

DTMF Transceiver

Oki Electric Industry 

¡ Semiconductor

MSM7524

Pin No.

28

29

30

31

32

Name

FXI–

GS3

CPI+

CPI–

GS2

I/O

Description

Special tone input and gain adjustment.

FXI- and GS3 are connected to the inverting input and the output of

the on-chip operational amplifiers (IV). The inverting input of the

amplifier (IV) is internally connected to SG.

I

When not using the special tone detect function, FXI- and GS3

should be wired to each other.

Regarding the gain adjustment, refer to Fig. 3.

C1 R2

IN

R3

FXI-

–

+

GS3 SG

O

• R2, R3, ≥ 50 kW, C1 = 2.2 µF

• Voltage Gain; R3/R2 £ 10 (20 dB)

Figure 3 Receive Gain Adjustment for FX

Two input and output pins of the on-chip operational amplifier (V).

I

These pins are useful to implement the pre-amplifier for Call

Progress Tone receiving.

I

Refer to Fig. 1.

Voltage gain should be less than 10 (20 dB).

O

Detect and non-detect amplitude are specified as the receive signal

level at GS2.

7/21

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