MSM7702 OKI electronic componets, MSM7702 Datasheet - Page 4

• Manufacturer Part Number: MSM7702
• Description: Single Rail CODEC
• Manufacturer: OKI electronic componets

¡ Semiconductor
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.
AG
Analog signal ground.
AOUT
Analog output.
The output signal has a maximum amplitude of 2.0 V
voltage (V
The output load resistance is a minimum of 1.2 kW.
During power saving or power down mode, the output of AOUT is at the voltage level of the
signal ground.
DD
1) Inverting input type
2) Non inverting input type
Analog input
Analog input
/2).
R5
C1
C2
R1
R3
R4
R2
GSX
AIN–
AIN+
SG
AIN+
AIN–
GSX
SG
–
+
+
–
PP
above and below the signal ground
R1 : variable
R2 > 20 kW
C1 > 1/(2 ¥ 3.14 ¥ 30 ¥ R1)
Gain = R2/R1 £ 10
R3 > 20 kW
R4 > 20 kW
R5 > 50 kW
C2 > 1/ (2 ¥ 3.14 ¥ 30 ¥ R5)
Gain = 1 + R4 / R3 £ 10
MSM7702-01/02/03
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