MSM7566RS 데이터 시트보기 (PDF) - Oki Electric Industry

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MSM7566RS

Single Rail CODEC

Oki Electric Industry 

¡ Semiconductor

MSM7566/7567

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

C3

R3

AIN+ +

AIN– –

GSX

SG

AG

R3 > 20 kW

R4 > 20 kW

R5 > 50 kW

C2 > 1/ (2 ¥ 3.14 ¥ 30 ¥ R5)

C3 : 10 to 20 pF

Gain = 1 + R4 / R3 £ 10

Note:

In the non-inverting input type, connect a 10 pF to 20 pF capacitor between the GSX pin

and the AG pin as illustrated in the figure above. This prevents the generation of

distortion during high power supply voltage and high level signal (+3 to –3dBm0)

input. In the inverting input type, eliminate the capacitor.

AG

Analog signal ground for digital signal circuits.

This ground is separate from the digital signal ground (DG) in this device. The AG pin must be

connected to the DG pin on the printed circuit board and then connected to the analog ground.

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