GS7025_09 Datasheet, PDF (4/23 Pages) Gennum Corporation – PRO-LINX Serial Digital Receiver

1.2 GS7025 Pin Descriptions
Table 1-1: GS7025 Pin Descriptions
Pin Number
1, 2
3, 44
4, 8, 13, 22, 35
5, 9, 14, 18, 27,
30, 33, 34, 37
6, 7
10
11, 12
15, 16, 17
19
20
21
23, 25, 26
24
28, 29
Name
DDI/DDI
V_CC_75
V_CC
V_EE
SDI/SDI
CD_ADJ
AGC-,
AGC+
LF+, LFS,
LF-
R_VCO_RTN
R_VCO
CBG
nc
RSV1
SCO/SCO
Type
I
I
I
I
I
I
I
I
I
I
I
-
I
O
31, 32
SDO/SDO
O
36
CLK_EN
I
38
C_OSC
I
39
LOCK
O
40
SSI/CD
O
41
A/D
I
42
MOD
I
43
OEM_TEST
O
Description
Digital data inputs (Differential ECL/PECL).
Power supply connection for internal 75Ω pullup resistors connected to DDI/DDI.
Most positive power supply connection.
Most negative power supply connection.
Differential analog data inputs.
Carrier detect threshold adjust.
External AGC capacitor. V_{common mode} = 2.7V typ.
Loop filter component connection.
R_VCO Return. Frequency setting resistor return connection.
Frequency setting resistor connection.
Internal bandgap voltage filter capacitor.
No connect - Do not connect to power or ground. Leave floating.
Reserved pin 1. Always set HIGH.
Serial clock output. SCO/SCO are differential current mode outputs and require
external 75Ω pullup resistors.
Equalized and reclocked serial digital data outputs. SDO/SDO are differential current
mode outputs and require external 75Ω pullup resistors.
Clock enable. When HIGH, the serial clock outputs are enabled.
Timing control capacitor for internal system clock.
Lock indication. When HIGH, the GS7025 is locked. LOCK is an open collector output
and requires an external 10kΩ pullup resistor.
Signal strength indicator/Carrier detect.
Analog/Digital select.
270 Mb/s modulus select - always set HIGH.
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.
GS7025 PRO-LINX™ Serial Digital Receiver
Data Sheet
13813 - 7
October 2009
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