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componentes Descripción

Lista de partido

MSM7575GS-BK

Multi-Function PCM CODEC

Oki Electric Industry 

¡ Semiconductor

MSM7575

PIN AND FUNCTIONAL DESCRIPTIONS

AIN1+, AIN1–, AIN2, GSX1, GSX2

Transmit analog input and the output for transmit gain adjustment. The pin AIN1– (AIN2)

connects to the inverting input of the internal transmit amplifier, and the pin AIN1+ connects to

the non-inverting input of the internal transmit amplifier. The pin GSX1 (GSX2) connects to

output of the internal transmit amplifier. Gain adjustment should be referred to Fig. 1.

VFRO, AOUT+, AOUT–, PWI, SAO, RINGC

Used for the receive analog output and the output for receive gain adjustment. VFRO is an

output of the receive filter. AOUT+ and AOUT– are differential analog signal outputs which can

directly drive ZL = 350 W + 120 nF or the 1.2 kW load. Gain adjustment should be referred to Fig.

1.

The ORed signal with the control register data CR4-B5 and the external pin RINGC determines

the output pins (AOUT+ and AOUT- /SAO+ and SAO-) for the speech signal and an acoustic

component of the sounder tone, DTMF tone, R tone, F tone, various kinds of tones at either the

VFRO pin or the SAO pin.

Differential

Analog Input

Vi

0.1 mF

10 mF

+

–

C1 R1

C1 R1

C2 R3

Transmit Gain: VGSX2/Vi

= (R2/R1) ¥ (R4/R3)

Receive Gain: Vo/VVFRO

= 2 ¥ (R6/R5)

AIN1–

–

R2

+

AIN1+

R2

GSX1

SG

AIN2

–

+

R4

GSX2

VFRO

R5

PWI

R6

Differential

ZL = 120 nF VO Analog

+ 350 W

Output

AOUT–

–

+

AOUT+

–1

Sounder Output

Signal

SAO

+1

RINGC

VREF

to ENCODER

from

DECODER

SELECT

from MCU INT.

TOUT1

TOUT2

+

–

TOUT3

from MCU INT.

Figure 1 Analog Input/Output Interface

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