GS2985 datasheet(9/45 Pages) SEMTECH

9 / 45 page

GS2985 Multi-Rate SDI Reclocker with Equalization &

De-emphasis

Data Sheet

36663 - 5

July 2012

9 of 45

Proprietary & Confidential

SCK/EQ2_EN

Input/Logic

Input

In host mode (HIF set LOW):

Burst-mode clock input for SPI serial host interface.

In non-host mode (HIF set HIGH):

Trace equalization on/off pin for Serial Digital Differential Input 2.

Active-high input.

SDO/EQ1_EN

Input/Logic

Input

In host mode (HIF set LOW):

Serial digital data output for SPI serial host interface. Active-high output.

In non-host mode (HIF set HIGH):

Trace equalization on/off pin for Serial Digital Differential Input 1.

Active-high input.

SDI/EQ0_EN

Input/Logic

Input

In host mode (HIF set LOW):

Serial digital data input for SPI serial host interface. Active-high input.

In non-host mode (HIF set HIGH):

Trace equalization on/off pin for Serial Digital Differential Input 0.

Active-high input.

VEE_CP

Power

Most negative power supply connection for the internal

charge pump. Connect to GND.

VCC_CP

Power

Most positive power supply connection for the internal charge pump.

Connect to 3.3V or 2.5V

LF+

Passive

Loop Filter capacitor connection. (CLF = 47nF). Connect as shown in Typical

Application Circuit on page 41.

CP_CAP

Power

External capacitor for internal LDO regulator supplying the charge pump

circuit.

−

Center Pad

−

Ground pad on bottom of package. Connect to GND.

Table 1-1: GS2985 Pin Descriptions

Pin Number

Name

Type

Description

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