MSM7540L 데이터 시트보기 (PDF) - Oki Electric Industry

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MSM7540L

Single Rail ADPCM CODEC

Oki Electric Industry 

¡ Semiconductor

MSM7540L/7560L

PIN AND FUNCTIONAL DESCRIPTIONS

AIN1, AIN2, GSX1, GSX2

Transmits analog input and the output for transmit gain adjustment.

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

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

adjustment.

VFRO, AOUT+, AOUT–, PWI

Receives analog output and the output for receive gain adjustment.

VFRO is 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)

Figure1 Analog Input/Output Interface

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