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Publication No. 980938 Rev. K
Model T940 User Manual
Astronics Test Systems
UR14 Driver/Receiver Board I-21
Description
Characteristics
Input Data Delay
220 ns with at least 2 V overdrive with respect
to the programmed input reference level.
>700 ns when less than 1 V of overdrive
Driver Thermal Protection
If Channel FET exceeds 175
°
C
Driver Over-voltage protection
Driver clamps at 42 V, suitable for inductive
loads
Programmable OC detect
thresholds
0-1 A ±4%
4 thresholds, 1 per byte
OC detect levels
16 selections (in Amps)
0.06
0.12
0.19
0.25
0.31
0.37
0.44
0.5
0.56
0.63
0.69
0.75
0.81
0.87
0.94
1
Input Sink Current
Up to 1 A per channel, or 1 A max per byte
On-board pull-up
1 k
Ω to +5 V default allows each channel to
be used as low speed TTL
Output Impedance
< 520
mΩ per channel
Input References
4 input references
INREF 1 Channels 1-8
INREF 2 Channels 9-16
INREF 3 Channels 17-24
INREF 4 Channels 25-32
Input Compare range
0 to +20 V
Input Reference resolution
5 mV steps
Input Compare Accuracy
±30 mV accuracy
PROGRAMMABLE CHANNELS
Table I-3: Programmable Channel Characteristics
Description
Characteristics
Digital I/O Type
Variable Voltage