GS3490 datasheet(4/22 Pages) SEMTECH

4 / 22 page

GS3490

Final Data Sheet

Rev. 1

GENDOC-058568

April 2014

4 of 22

Proprietary & Confidential

www.semtech.com

EQ_GAIN_SEL

Input

Input Sensitivity Control.

Please refer to the input logic parameter in Table 2-2: DC

Electrical Characteristics for logic level threshold and

compatibility. This pin is a 3.3V input.

When HIGH, the device compensates for an additional 6dB

of loss across the entire operating band.

This pin has an internal 100k

Ω pull-down resistor.

9, 10

AGC/AGC

—

External AGC capacitor connection.

—

No Connect. Not bonded internally.

EQ_BYPASS

Input

Equalizer Bypass Control.

Please refer to the input logic parameter in Table 2-2 for

Logic Level threshold and compatibility.

For details on operation, refer to Section 4.1.3.

This pin has an internal 100k

Ω pull-down resistor.

EQ_SQ_ADJ

Input

Squelch Threshold Adjust.

For details on operation, refer to Section 4.1.5.

This pin has an internal 82.4k

Ω pull-down resistor.

EQ_OP_CTL

Input

Controls the Output Swing, De-emphasis and Mute

features of the DDO/DDO outputs.

For details on operation, refer to Section 4.1.7.

This pin has an internal 1M

Ω pull-down resistor.

CD_SD_EN

Input

Cable Driver Slew Rate Control.

For details on operation, refer to Section 4.2.4.

When left unconnected, the default state of this pin is logic

HIGH

17, 26, 31, 32

VCC

Power

Most positive power supply connection.

Connect to 3.3V DC.

18, 19

DDI/DDI

Input

Differential digital data input to cable driver core.

22, 23

DDO/DDO

Output

Differential digital data output from cable equalizer core.

RSET

—

External cable driver output amplitude control resistor

connection.

EQ_DISABLE

Input

Equalizer Mode Disable Control.

Please refer to the input logic parameter in Table 2-2 for

logic level threshold and compatibility.

For details on operation, refer to Section 4.1.1.

This pin has an internal 100k

Ω pull-down resistor.

Table 1-1: GS3490 Pin Descriptions (Continued)

Pin Number

Name

Type

Description

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