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