GS3441 datasheet(5/25 Pages) SEMTECH

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GS3441 Extended Reach 3G/HD/SD Adaptive Cable

Equalizer with Dual Outputs

Final Data Sheet

Rev. 1

GENDOC-056647

May 2013

5 of 25

Proprietary & Confidential

www.semtech.com

6, 7

AGC, AGC

Analog

—

External AGC capacitor connection.

8BYPASS

Not

Synchronous

Input

Core Bypass Control.

Please refer to the input logic parameter in the DC Electrical

Characteristics table for logic level threshold and compatibility. This

pin is a 2.5V input that is tolerant to 3.3V levels.

Forces the equalizer and DC-restore stages into Bypass mode when

HIGH. No equalization occurs in this mode.

This pin has an internal pull-down resistor.

SQ_ADJ

Analog

Input

Squelch Threshold Adjust.

Adjusts the input signal amplitude threshold of the carrier detect

function. The serial data output of the device can be muted when

the serial data input signal amplitude is too low by connecting the

CD and OPn_CTL pins via suitable resistor networks (see Figure 4-2

and Figure 4-3).

This pin has an internal pull-down resistor.

Note: The SQ_ADJ function is only available when the device is not

in auto-sleep mode. Reference Section 4.5 for more detail.

OP2_EN

—

Input

Output 2 Enable.

Please refer to the input logic parameter in the DC Electrical

Characteristics table for logic level threshold and compatibility.

When HIGH, Output 2 is operational.

When LOW, Output 2 is powered-down and the outputs are both at

VCC_O2.

This pin has an internal pull-down resistor.

OP2_CTL

Not

Synchronous

Input

Controls the Output Swing, De-emphasis and Mute features of the

DDO/DDO outputs for Output 2.

When this pin is connected to GND, the output swing is 850mVppd

with no de-emphasis.

With this pin connected to a 2.5V, the output is muted.

Intermediate voltages and functions are shown in Table 4-5. These

voltages can be achieved as shown in Figure 4-2 and Figure 4-3.

This pin has an internal pull-down resistor.

VCC_O2

Analog

Power

Most positive power supply connection for the output buffer for

output 2.

Connect to 1.2 - 3.3V DC.

13, 14

DDO2,

DDO2

Analog

Output

Serial digital differential output 2.

VEE_O2

Analog

Power

Most negative power supply connection for the output buffer for

output 2.

Connect to GND.

VEE_O1

Analog

Power

Most negative power supply connection for the output buffer for

output 1.

Connect to GND.

17, 18

DDO1,

DDO1

Analog

Output

Serial digital differential output 1.

Table 1-1: GS3441 Pin Descriptions (Continued)

Pin Number

Name

Timing

Type

Description

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