gs9005a Gennum Corporation, gs9005a Datasheet - Page 5

• Manufacturer Part Number: gs9005a
• Description: Serial Digital Receiver Corporation
• Manufacturer: Gennum Corporation

GS9005 & GS9005A PIN DESCRIPTIONS cont.
PIN NO
18
19
20,21
22,23
24,25
26
27
28
INPUT / OUTPUT CIRCUITS
SCO/SCO Outputs
V
SYMBOL
CD
SS0, SS1 Inputs
SDO/SDO Outputs
V
V
SSI
CC3
CC4
EE2
Pin 5
Pin 6
A / D
Pin 1
DDI
DDI
Output
TYPE
V
CC
Standard Select Inputs. TTL inputs to the 2:4 multiplexer used to select one of four VCO centre
frequency setting resistors (R
When SS0 is HIGH and SS1 is LOW, R
is selected and when both SS0 and SS1 are HIGH, R
Serial Clock Outputs (inverse and true). Pseudo-ECL differential outputs of the extracted serial clock.
These outputs require 390
These outputs require 390
Power Supply. Most positive power supply connection. (ECL outputs)
Power Supply. Most negative power supply connection. (Phase detector, A/D select, Carrier detect)
Signal Strength Indicator. Analog output which indicates the amount of AGC action. This output
indirectly indicates the amount of equalization and thus cable length.
Power Supply. Most positive power supply connection. (VCO, MUX, standards select).
Carrier Detect. Open collector output which goes HIGH when a signal is present at either the Serial
Data inputs or the Direct Digital inputs. This output is used in conjunction with the GS9000B or GS9000S
in the Automatic Standards Select Mode to disable the 2 bit standard select counter. This pin should
see a low impedance (e.g. 1nF to AC Gnd)
low impedance (e.g. 1nF to AC Gnd)
Serial Data Outputs (inverse and true). Pseudo-ECL differential outputs of the regenerated serial data.
16µA
V
CC
50µA
Fig. 3 Pins 1, 5 and 6
V CC
pull-down resistors to V
pull-down resistors to V
VCO0
380µA
5
- R
VCO3
VCO1
2k
1k
DESCRIPTION
). When both SS0 and SS1 are LOW, R
is selected. When SS0 is LOW and SS1 is HIGH, R
EE
EE
VCO3
.
.
is selected. These pins should see a
V
CC
+
-
1k
2k
1.2V
+
-
1.6V
VCO0
is selected.
VCO2
520 - 28 - 11