FEDL7022-01-06

1Semiconductor

ML7022-01

12/20

FUNCTIONAL DESCRIPTION

Pin Functional Description

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-amp; GSX1 and GSX2 are connected to the output of the op-amp

and are used to adjust the level, as shown below.

If AIN1 and AIN2 are not used, connect AIN1 to GSX1 and AIN2 to GSX2. During power saving and power down

mode, the GSX1 and GSX2 outputs are at AG voltage.

In the case of the analog input 2.26 Vpp at GSX pin with digital output +3.17 dBm0 (

µ-law).

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 3.4Vpp above and below the signal ground voltage (SG).When the digital

signal of +3.17 dBm0 is input to DIN, it can drive a load of 600

Ω or more.

During power saving or power down mode, these outputs are at a high impedance.

V

DD

Power supply for +5 V.

Connect a bypass capacitor of 0.1

µF with excellent high frequency characteristics between this pin and the AG

pin.

Although V

board.

CH1 Gain

Gain = R2/R1

≤ 10

R1: Variable

R2

> 20 kΩ

C1

> 1/ (2 × 3.14 × 30 × R1)

CH2 Gain

Gain = R4/R3

≤ 10

R3: Variable

R4

> 20 kΩ

C2

> 1/ (2 × 3.14 × 30 × R3)

CH1

Analog

Input

GSX1

AIN1

SG

R2

R1

C1

CH2

Analog

Input

GSX2

AIN2

SG

R4

R3

C2