MSM7540 데이터 시트보기 (PDF) - Oki Electric Industry

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MSM7540

Single Rail ADPCM CODEC

Oki Electric Industry 

¡ Semiconductor

MSM7540/7560

PIN AND FUNCTIONAL DESCRIPTIONS

AIN1, AIN2, GSX1, GSX2

Transmit analog inputs and the output for transmit gain adjustment.

AIN1 (AIN2) connects to the inverting input of the internal transmit amplifier. GSX1 (GSX2)

connects to the internal transmit amplifier output. Refer to Fig. 1 for gain adjustment.

VFRO, AOUT+, AOUT–, PWI

Receive analog output and the output for receive gain adjustment.

VFRO is the receive filter output. AOUT+ and AOUT– are differential analog signal outputs

which can directly drive ZL = 350 W + 120 nF. Refer to Fig. 1 for gain adjustment.

Analog Input

C1 R1

R2

C2 R3

R4

Transmit Gain:

= (R2/R1) ¥ (R4/R3)

RS*

Receive Gain:

= (R6/R5)

R5

AIN1

–

+

GSX1

AIN2

–

+

GSX2

to ENCODER

VFRO

PWI

from DECODER

R6

AOUT–

–

+

ZL=120 nF V0

+ 350 W

Analog Output

–1

AOUT+

* : Side Tone Pass (Gain = R6/RS)

Figure 1 Analog Input/Output Interface

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