evertz HD2012 - Reference Video Connections; Figure 2-2: GPI Input Circuitry; Figure 2-3: GPO Output Circuitry

HD2014, HD2012, HD2011 Video Passport
TM
1RU Multi-Path Video Converter, Frame Synchronizer and Decoder
Page 2-2 Revision 0.1 INSTALLATION
GPI
GND
GPI
Command
to
internal
circuit
3.6 K
+ 5
VDC
Figure 2-2: GPI Input Circuitry
Figure 2-2 shows the internal circuit when HD201x GPIOs are configured to be General Purpose Inputs
(GPIs). GPIs are active low and edge sensitive rather than level sensitive. Figure 2-3 shows the internal
circuit when HD201x GPIOs are configured to be General Purpose Outputs (GPOs). The GPO is active
low with internal pull up (10k Ohm) resistors to +5V. When the output goes low it is able to sink up to
10mA. When high, the signal will go high (+5V). Do not draw more than 100µA from the output.
From Internal
Circuit
+ 5 Volts
GND
GPO
10 ohm
10 K
Figure 2-3: GPO Output Circuitry
2.1.2. Reference Video Connections
REF IN: BNC input for supplying external reference with internal 75 ohm termination. The
HD201x series supports bi-level sync NTSC or PAL references. NSTC/PAL color
black references may also be used.