Quadro Sync DU-06574-001_v01 | 20
SYNC TO AN EXTERNAL TIMING SOURCE
EXTERNAL TIMING SOURCES
The Quadro Sync board supports three types of external timing sources through the
BNC connector on the bracket.
TTL: 3.3V, 50% duty cycle, high impedance
Bi-Level Composite (NTSC/PAL): 75 Ω impedance
Tri-Level Composite (HDTV): 75 Ω impedance
● SMPTE Standard 240 compliant
CAUTION: Using timing signal Voltages above specification: +3.3 V for TTL, ±300
mV for Composite will damage the Quadro Sync board.
Note: When using TTL Sync it is important to use a high quality signal generator as
variances in the external sync frequency will cause the displays to blink as they
adjust their timings to follow the wandering input signal.
When a valid signal is connected to the BNC connector, the LED below it will illuminate
solid green. Once the Quadro Sync board is using the external signal the same LED will
flash green at the rate of the incoming sync signal.
When using an external sync both Windows and Linux will identify the incoming sync
type and configure the board to use it at the same refresh rate. There are extra settings
available to adjust how the board converts the external sync to the internal sync:
Select which edge of external sync pulse triggers the internal pule, leading, trailing, or
on TTL both
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