MSM7717-02 데이터 시트보기 (PDF) - Oki Electric Industry

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MSM7717-02

Single Rail CODEC

Oki Electric Industry 

¡ Semiconductor

MSM7717-01/02/03

PIN AND FUNCTIONAL DESCRIPTIONS

AIN+, AIN–, GSX

Transmit analog input and transmit level adjustment.

AIN+ is a non-inverting input to the op-amp; AIN– is an inverting input to the op-amp; GSX is

connected to the output of the op-amp.

The level adjustment should be performed in any method shown below. When not using AIN–

and AIN+, connect AIN– to GSX and AIN+ to SG. During power-saving and power-down

modes, the GSX output is at AG voltage.

1) Inverting input type

Analog input

GSX

C1

R1

R2

AIN–

AIN+

–

+

SG

R1 : variable

R2 > 20 kW

C1 > 1/(2 ¥ 3.14 ¥ 30 ¥ R1) (F)

Gain = R2/R1 < 10

2) Noninverting input type

C2

Analog input

R5

R4

R3

AIN+

AIN–

+

–

GSX

SG

R3 > 20 kW

R4 > 20 kW

R5 > 50 kW

C2 > 1/ (2 ¥ 3.14 ¥ 30 ¥ R5) (F)

Gain = 1 + R4 / R3 £ 10

AG

Analog signal ground.

VFRO

Receive filter output.

The output signal has an amplitude of 2.0 VPP above and below the signal ground voltage (SG)

when the digital signal of +3 dBm0 is input to PCMIN and can drive a load of 20 kW or more.

For driving a load of less than 20 kW, connect a resistor of 20 kW or more between the pins VFRO

and PWI.

During power-saving mode this output is in a high impedance state, and during power-down

mode, the VFRO output is at an SG level.

When adjusting the receive signal on the basis of frequency characteristics, refer to the Frequency

Characteristics Adjustment Circuit.

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