MSM7508 Ver la hoja de datos (PDF) - Oki Electric Industry

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MSM7508

Single Rail CODEC

Oki Electric Industry 

¡ Semiconductor

MSM7508B/7509B

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 in a high impedance state.

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.

AOUT

Analog output.

The output signal amplitude is a maximum of 2.4 VPP above and below the signal ground voltage

level (VDD/2).

The output load resistance is a minimum of 20 kW.

During power saving or power down mode, the output of AOUT is at the voltage level of signal

ground.

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