GS2985 datasheet(8/45 Pages) SEMTECH

8 / 45 page

GS2985 Multi-Rate SDI Reclocker with Equalization &

De-emphasis

Data Sheet

36663 - 5

July 2012

8 of 45

Proprietary & Confidential

SD/HD

Output

This signal will be LOW for all rates other than 270Mb/s.

This signal is HIGH for 270Mb/s.

KBB

Analog Input

Controls the loop bandwidth of the PLL. Leave this pin

floating for serial reclocking applications.

DDO1_DISABLE

Logic Input

Disables the DDO1/RCO and DDO1/RCO outputs

when LOW.

See Section 4.14.

DATA_MUTE

Logic Input

Mutes the DDO0/DDO0 and DDO1/DDO1 (if data is selected) outputs when

LOW.

Set HIGH for normal operation.

DATA/CLOCK

Logic Input

DATA/CLOCK select.

See Section 4.14.

38, 40

DDO1/RCO,

DDO1/RCO

Output

Differential serial clock or data outputs.

DE1_EN

Logic Input

De-emphasis on/off pin for serial digital output 1.

HIGH = de-emphasis on

LOW = de-emphasis off

VCC_DDO1

Power

Most positive power supply connection for the DDO1/DDO1 output driver.

Connect to 3.3V or 2.5V.

VEE_DDO1

Power

Most negative power supply connection for the DDO1/DDO1 output

driver. Connect to GND.

GND_DRV

Power

Connect to GND.

44, 46

DDO0, DDO0

Output

Differential Serial Digital Outputs.

DE0_EN

Logic Input

De-emphasis on/off pin for serial digital output 0.

HIGH = de-emphasis on

LOW = de-emphasis off

VCC_DDO0

Power

Most positive power supply connection for the DDO0/DDO0 output driver.

Connect to 3.3V or 2.5V.

VEE_DDO0

Power

Most negative power supply connection for the DDO0/DDO0 output

driver.

Connect to GND.

XTAL_BUF_OUT

Output

Buffered output of the reference oscillator.

XTAL+

Output

Reference crystal output.

XTAL-

Input

Reference crystal input.

CS/EQ3_EN

Input/Logic

Input

In host mode (HIF set LOW):

Chip select input for SPI serial host interface. Active-low input.

In non-host mode (HIF set HIGH):

Trace equalization on/off pin for Serial Digital Differential Input 3.

Active-high input.

Table 1-1: GS2985 Pin Descriptions

Pin Number

Name

Type

Description

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