11.4.1
I/O connector input overvoltage protection
All inputs of the I/O connector are over voltage protected. All inputs use the
following schematic approach.
To system timbase, trigger
and recording control
From input connector
+5V
20 kOhm
2 kOhm
+5V
Figure 11.14:
I/O connector schematic inputs
Due to the 20 kΩ pull
-
up resistor all input will be “TTL High” and only need an
external short to signal ground to be operated. The 2 kΩ series resistor together
with the diode clamps to ground and +5 V protect the digital circuitry up to the
specified voltages.
The clamping diodes and other parasitic capacitors do create a capacitive load
on your signal source and limit the signal bandwidth. To reach the required
bandwidths detailed compensations are made not addressed in this block
diagram.
GEN3i
I3763-3.1 en HBM: public
183
