PIN DESCRIPTIONS (continued)
NUMBER
28, 29
SYMBOL
SCO/SCO
TYPE
O
DESCRIPTION
Serial clock output. SCO/SCO are differential current mode outputs and require
external 75Ω pullup resistors.
Equalized and reclocked serial digital data outputs. SDO/SDO are differential current
mode outputs and require external 75Ω pullup resistors.
31, 32
SDO/SDO
O
GS9025A
36
38
39
CLK_EN
COSC
LOCK
I
I
O
Clock enable. When HIGH, the serial clock outputs are enabled.
Timing control capacitor for internal system clock.
Lock indication. When HIGH, the GS9025A is locked. LOCK is an open collector output
and requires an external 10kΩ pullup resistor.
Signal strength indicator/Carrier detect.
Analog/Digital select.
SMPTE/Other data rate select. TTL/CMOS compatible input.
Output ‘Eye’ monitor test. Single-ended current mode output that requires an external
50Ω pullup resistor. This feature is recommended for debugging purposes only. If
enabled during normal operation, the maximum operating temperature is rated to
60°C.
40
41
42
43
SSI/CD
A/D
SMPTE
OEM_TEST
O
I
I
O
6
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