GS7025 PRO-LINX™ Serial Digital Receiver

Data Sheet

13813 - 7

October 2009

4 of 23

1.2 GS7025 Pin Descriptions

Table 1-1: GS7025 Pin Descriptions

Pin Number

Name

Type

Description

1, 2

DDI/DDI

I

Digital data inputs (Differential ECL/PECL).

3, 44

I

Power supply connection for internal 75Ω pullup resistors connected to DDI/DDI.

4, 8, 13, 22, 35

I

Most positive power supply connection.

5, 9, 14, 18, 27,

30, 33, 34, 37

I

Most negative power supply connection.

6, 7

SDI/SDI

I

Differential analog data inputs.

10

CD_ADJ

I

Carrier detect threshold adjust.

11, 12

AGC-,

AGC+

I

15, 16, 17

LF+, LFS,

LF-

I

Loop filter component connection.

19

I

20

I

Frequency setting resistor connection.

21

CBG

I

Internal bandgap voltage filter capacitor.

23, 25, 26

nc

-

No connect - Do not connect to power or ground. Leave floating.

24

RSV1

I

Reserved pin 1. Always set HIGH.

28, 29

SCO/SCOO

Serial clock output. SCO/SCO are differential current mode outputs and require

external 75Ω pullup resistors.

31, 32

SDO/SDO

O

Equalized and reclocked serial digital data outputs. SDO/SDO are differential current

mode outputs and require external 75Ω pullup resistors.

36

CLK_EN

I

Clock enable. When HIGH, the serial clock outputs are enabled.

38

I

Timing control capacitor for internal system clock.

39

LOCK

O

Lock indication. When HIGH, the GS7025 is locked. LOCK is an open collector output

and requires an external 10kΩ pullup resistor.

40

SSI/CDO

Signal strength indicator/Carrier detect.

41

A/D

I

Analog/Digital select.

42

MOD

I

270 Mb/s modulus select - always set HIGH.

43

OEM_TEST

O

Output ‘Eye’ monitor test. Single-ended current mode output that requires an

external 50Ω pullup resistor. This feature is recommended for debugging purposes

only. If enabled during normal operation, the maximum operating temperature is

rated to 60°C. For maximum cable length performance the OEM_TEST must be

disabled.