GS7025 Datasheet, PDF (5/13 Pages) Gennum Corporation – Serial Digital Receiver

PIN CONNECTIONS
DDI
DDI
V_{CC_75}
V_CC
V_EE
SDI
SDI
V_CC
V_EE
CD_ADJ
AGC-
44 43 42 41 40 39 38 37 36 35 34
1
33
2
32
3
31
4
30
5
GS7025
29
6
TOP VIEW
28
7
27
8
26
9
25
10
24
11
23
12 13 14 15 16 17 18 19 20 21 22
V_EE
SDO
SDO
V_EE
SCO
SCO
V_EE
nc
nc
270
nc
PIN DESCRIPTIONS
NUMBER
SYMBOL TYPE
DESCRIPTION
1, 2
DDI/DDI
I
Digital data inputs (Differential ECL/PECL).
3, 44
4, 8, 13, 22, 35
5, 9, 14, 18, 27, 30,
33, 34, 37
V_CC_75
V_CC
V_EE
I
Power supply connection for internal 75Ω pullup resistors connected to DDI/DDI.
I
Most positive power supply connection.
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
External AGC capacitor.
15, 16, 17
LF+, LFS, LF-
I
Loop filter component connection.
19
R_VCO_RTN
I
R_VCO Return.
20
R_VCO
I
Frequency setting resistor.
21
CBG
I
Internal bandgap voltage filter capacitor.
23, 25, 26
nc
-
No connect - Do not connect to power or ground. Leave floating.
24
270
I
270Mb/s Data Rate Select - Always set high.
28, 29
SCO/SCO
O 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.
5
GENNUM CORPORATION
522 - 80 - 00