User's Manual

Theory of Operation
A/D Theory of Operations
2
2-17
A4 Analog Input
EMI Filters
Ch1 to 10
Scanner Relays
Ch11 to 20
Scanner Relays
Treeing Relays
Voltage InputOhms Current Source
Input Protection
Signal Conditioning
Selectable Gains
x1
x10
x4.021
x32.168
BR4
BR3
BR2
BR1
A/D Converter
+3.45V dc
References
FPGA
Microprocessor
(Guard Crossing)
Serial Bus
Flash
RAM
Serial Digital Output
Relay
Drivers
Latches
Vdd=+5.2V dc
Vss=-5.2V dc
Vddr=+5.6V dc
Reg
Vcc=+5.0V dc
A/D
DC Buffer Amplifier
alg110f.eps
Figure 2-5. A3 A/D Converter Block Diagram