MSM7704-02 查看數據表（PDF） - Oki Electric Industry

零件编号

产品描述 (功能)

生产厂家

MSM7704-02

2ch Single Rail CODEC

Oki Electric Industry 

¡ Semiconductor

MSM7704-01/02/03

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.

CH1

Analog Input

R2

GSX1

C1 R1

AIN1 –

+

CH2

Analog Input

R4

GSX2

C2 R3

AIN2 –

+

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)

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 VPP above and below the signal ground voltage (SG

: 1/2 VDD). When the digital signal of +3 dBmO is input to DIN1 and DIN2, it can drive a load

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.

VDD

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.

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