Analog Interface Block Diagram
2.1 Analog Interface Block Diagram
A block diagram for the analog interface of the EVM is shown in Figure 2− 1.
Figure 2−1. Block Diagram
P1 / J1
Signal
Conditioning
TLC3578
TLC3574
TLC3548
TLC3544
TLC2578
TLC2574
The channels are arranged to comply with the EVM standard developed for data converters. This standard defines eight channels of analog I/O on each EVM module.
2.2 Signal Conditioning
The facility exists for the signal connected to channel 0 to be conditioned via an operational amplifier. The amplifier present on the EVM operates from a dual power supply and is configured with a gain of +1.
If signal conditioning is not required, it can easily be bypassed via a shorting bar.
2.3 Single Supply Operation
Should the user wish to operate the amplifier from a single suply rail, this is also possible by simply removing the dual supply amplifier and replacing it with a suitable single supply alternative, for example the OPA353.
The suggested procedure is detailed below:
-Carefully desolder amplifier, U1
-Replace with a suitable
-Install appropriate resistor at R9
-Install appropriate capacitor at C11
-Install shorting bar at W1
