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MSM7544RS

Single Rail CODEC

Oki Electric Industry 

¡ Semiconductor

MSM7543/7544

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 and is used to adjust the level, as 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

C1

R1

GSX

R2

AIN–

AIN+

SG

–

+

R1 : variable

R2 > 20 kW

C1 > 1/(2 ¥ 3.14 ¥ 30 ¥ R1)

Gain = R2/R1 £ 10

2) Non inverting 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)

Gain = 1 + R4 / R3 £ 10

AG

Analog signal ground.

VFRO

Receive filter output.

The output signal has an amplitude of 2.4 VPP above and below the signal ground voltage (SG)

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

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

and PWI.

When adding the frequency characteristics to the receive signal, refer to the application example.

During power saving or power down mode, the output of VFRO is at the voltage level of AG.

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