PIN DESCRIPTIONS (Continued)
NUMBER
106
SYMBOL
DDI_V
TT
LEVEL
Analog
TYPE
Input
DESCRIPTION
Bias Input.
Selectable input for interfacing standard ECL outputs
requiring 50Ω pull down to V
TT
power supply for a seamless interface.
See Typical Application Circuit for recommended circuit application.
108, 109
DDI, DDI
Differential
ECL/PECL
Input
Digital Data Input Signals.
Digital input signals from a GS1504
Equalizer or HD crosspoint switch.
Because of on chip 50Ω termination resistors, a PCB trace
characteristic impedance of 50Ω is recommended.
110
PD_V
CC
A/D
Power
Positive Supply.
Phase detector most positive power supply
connection.
Input
Control Signal Input.
Used to select between the SDI/SDI input or
DDI/DDI input.
When A/D is HIGH; the SDI/SDI input is selected.
When A/D is LOW; the DDI/DDI input is selected.
112
PDSUB_V
EE
PD_V
EE
EQI_V
CC
EQI_V
EE
SDI, SDI
Power
Input
Substrate Connection.
Connect to phase detector’s most negative
power supply.
Negative Supply.
Phase detector most negative power supply
connection.
Positive Supply.
Most positive power supply connection for serial input
stage.
Negative Supply.
Most negative power supply connection for serial
input stage.
Serial Data Input Signals.
AC coupled termination is recommended.
Single ended to differential conversion is also feasible. The SDI and
SDI input is selected when the A/D signal is high.
Ensure that the trace length between the input connector and the
GS1545 IC is kept to a minimum and that a PCB trace characteristic
impedance of 75Ω is maintained between the connector and the
device.
GS1545
111
TTL
113
Power
Input
117
Power
Input
120, 126
Power
Input
122, 124
Analog
Input
9 of 19
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