msm7704-03gs-k Oki Semiconductor, msm7704-03gs-k Datasheet - Page 4

• Manufacturer Part Number: msm7704-03gs-k
• Description: 2ch Single Rail Codec
• Manufacturer: Oki Semiconductor

¡ Semiconductor
PIN AND FUNCTIONAL DESCRIPTIONS
AIN1, AIN2, GSX1, GSX2
AIN1 and AIN2 are the transmit analog inputs for channels 1 and 2.
GSX1 and GSX2 are the transmit level adjustments for channels 1 and 2.
AIN1 and AIN2 are inverting inputs for the op-amps. GSX1 and GSX2 are connected to the
outputs of the op-amps and are used to adjust the level, as shown below.
When AIN1 and AIN2 are not used, connect AIN1 to GSX1 and AIN2 to GSX2. During power
saving mode and power down mode, the GSX1 and GSX2 outputs are in high impedance state.
AOUT1, AOUT2
AOUT1 is the receive analog output for channel 1 and AOUT2 is used for channel 2.
The output signal has an amplitude of 2.0 V
: 1/2 V
of 1.2 kW or more.
During power saving mode, or power down mode, these outputs are at the voltage level of SG
with a high impedance.
V
Power supply for +3 V.
A power supply for an analog circuit in the system to which the device is applied should be used.
A bypass capacitor of 0.1 mF to 1 mF with excellent high-frequency characteristics and a capacitor
of 10 mF to 20 mF should be connected between this pin and the AG pin if needed.
DD
CH1
Analog Input
CH2
Analog Input
DD
). When the digital signal of +3 dBmO is input to DIN1 and DIN2, it can drive a load
C1
C2
R1
R3
R2
R4
GSX1
AIN1
GSX2
AIN2
PP
above and below the signal ground voltage (SG
–
+
–
+
CH1 Gain
Gain = R2/R1 £ 10
R1: Variable
R2 > 20 kW
C1 > 1/(2 ¥ 3.14 ¥ 30 ¥ R1)
CH2 Gain
Gain = R4/R3 £ 10
R3: Variable
R4 > 20 kW
C2 > 1/(2 ¥ 3.14 ¥ 30 ¥ R3)
MSM7704-01/02/03
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