User Guide
11
Inputs
When the input is active-high
▪
When the switch is open, the pull-down resistor ensures that no voltage exists
on the input signal, which will be interpreted by the DPS70 as inactive
▪
When the switch is closed, the input is connected to battery voltage, which
will be interpreted by the DPS70 as active
A typical active-high digital input connection is shown below:
Internal to product
Active High
Digital Input
Battery
Application Switch
Figure 4: Active high digital input
2.4. Video Inputs
The DPS70 accepts 5 NTSC/PAL camera inputs via BNC video connectors on the
rear of the unit. Inputs #1 and #2 feed are multiplexed to the same input of the
video decoder. Video inputs 3, 4 and 5 have dedicated decoder inputs. Up to 4
video feeds can be shown on the display simultaneously.
2.4.1. Video Input Capabilities
The following table provides specifications for the video inputs:
Video Input Specifications
Item
Min
Nom
Max
Unit
Input voltage range
-5.6
5.6
V
Input resistance
75
Capacitance at pin
65
100
pF
