CN0225 is a complete analog front end for digitizing ±10 V industrial level signals with a 16-bit differential input PulSAR® ADC. The circuit provides a high impedance instrumentation amplifier input with high CMR, level shifting, attenuation, and differential conversion, with only two analog components.The two active components which drive an AD7687 differential input 16-bit PulSAR ADC are the AD8295 precision instrumentation amplifier and the AD8275 level translator/ADC driver. An ADR431 low noise 2.5V XFET® reference supplies the voltage reference for the ADC.
The AD8295 has two uncommited on-chip signal procesing amplifiers and two precisely matched 20 kΩ resistors in a small 4 mm X 4 mm package.
The AD8275 is a G = 0.2 difference amplifier that can be used to attenuate ±10 V industrial signals, and the attenuated signal can be easily interfaced to a single supply low voltage ADC. The AD8275 performs the attenuation and level shifting function in the circuit, maintaining good CMR without any need for external components.
The CN0225 needs +15 V, -15 V and +6 V power supply inputs and thus, needs a triple output DC power supply. The board also connects to ADI's System Demonstration Platform (*SDP*).
Connect the (EVAL-CN0225-SDPZ) and the (SDP-B Board), then power the (EVAL-CN0225-SDPZ) through the triple output power supply before connecting the (SDP-B Board) to the PC
See the table in the image below for the jumper settings. Values in red are the default settings for the EVAL-CN0225-SDPZ
NOTE: It is recommended that you install the CN0203 Evaluation Software to the default directory path C:\Program Files (x86)\Analog Devices\ and all National Instruments products to C:\Program Files\National Instruments\
NOTE: It is recommended that you close all other applications before clicking “Next”. This will make it possible to update relevant system files without having to reboot your computer.
It is recommended that you install the drivers to the default directory path
C:\Program Files\Analog Devices\SDP\Drivers
EVAL-CN0225-SDPZ Design & Integration Files
Receive software update notifications, documentation updates, view the latest videos, and more when you register your hardware. Register to receive all these great benefits and more!
End of Document