MSM7718-01 데이터 시트보기 (PDF) - Oki Electric Industry

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MSM7718-01

Echo Canceler with ADPCM CODEC

Oki Electric Industry 

¡ Semiconductor

MSM7718-01

PIN FUNCTIONAL DESCRIPTION

AIN1+, AIN1–, AIN2, GSX1, GSX2

Transmit analog inputs and the outputs for transmit gain adjustment.

AIN1– (AIN2) connects to inverting input of the internal transmit amplifier. AIN1+ connects to non-

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 outputs 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) or a 1.2 kW load. Refer to Fig.1 for gain adjustment.

However, these outputs are in high impedance state during power-down.

Differential

Analog Input V1

C1 R1 R2

C1 R1

R2

+

–

C2 R3

R4

Transmit Gain: VGSX2/Vi

= (R2/R1) ¥ (R4/R3)

Receive Gain: VO/VVFRO

= 2 ¥ (R5/R6)

R6

AIN1–

–

+

AIN1+

GSX1

SGT

AIN2

–

+

GSX2

VFRO

PWI

VREF

to ENCODER

from DECODER

R5

ZL=120 nF + 350 W

Differential

VO Analog

Output

AOUT–

–

+

AOUT+

–1

Figure 1 Analog Interface

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