GENNUM CORPORATION

522 - 28 - 00

9

106

Analog

Input

Bias Input. Selectable input for interfacing standard ECL outputs

requiring 50

Ω pull down to V

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 50

Ω termination resistors, a PCB trace

characteristic impedance of 50

Ω is recommended.

110

Power

Positive Supply. Phase detector most positive power supply

connection.

111

A/D

TTL

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

Power

Input

Substrate Connection. Connect to phase detector’s most negative

power supply.

113

Power

Input

Negative Supply. Phase detector most negative power supply

connection.

117

Power

Input

Positive Supply. Most positive power supply connection for serial input

stage.

120, 126

Power

Input

Negative Supply. Most negative power supply connection for serial

input stage.

122, 124

SDI, SDI

Analog

Input

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 75

Ω is maintained between the connector and the

device.

PIN DESCRIPTIONS (Continued)

NUMBER

SYMBOL

LEVEL

TYPE

DESCRIPTION