This version is outdated by a newer approved version.
This version (03 Nov 2017 09:07) is a draft.
Approvals: 0/1
This version (03 Nov 2017 09:07) is a draft.Approvals: 0/1
This is an old revision of the document!
Table of Contents
CN0225 Evaluation Board Guide
Overview
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*).
Required Equipment
- ±25 V/1 A Triple Output DC Power Supply (Agilent E3631A)
- Low distortion single-ended or differential signal source (Agilent 81150A or Audio Precision System Two 2322)
- PC with USB interface
- Windows 7 or higher
General Setup
Block Assignments
- The EVAL-CN0225-SDPZ (CN0225 Board) connects to the EVAL-SDP-CB1Z (SDP-B Board) via the 120-Pin Connector (SDP Conn)
- The EVAL-SDP-CB1Z (SDP-B Board) connects to the PC via the USB cable
- Terminal block J1 is the +/- analog signal input
- Terminal block J2 is the +6 V power supply input
- Terminal block J3 is the +/- 15 V power supply input
- Terminal block J4 contains the test points for the SPI signals
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
Setup Block Diagram
Jumper Settings
See the table in the image below for the jumper settings. Values in red are the default settings for the EVAL-CN0225-SDPZ
Installing the Evaluation Software
- Extract the file CN0225 Evaluation Software and open setup.exe
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\
- Press Next to view the National Instruments Software License Agreement
- Select the option which accepts the License Agreement and press Next to view the installation review page
- Press Next to start the installation
- Upon completion of the installation of the CN0225 Evaluation Software, the installer for the ADI SDP Drivers will execute
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.
- Press “Next” to set the installation location for the SDP Drivers
It is recommended that you install the drivers to the default directory path
C:\Program Files\Analog Devices\SDP\Drivers
- Press “Next” to install the SDP Drivers. When prompted by Windows Security, just press Install
- Press Finish to complete the installation
- (Optional) Restart the PC when prompted by the installer
resources/eval/user-guides/circuits-from-the-lab/cn0225.1509696445.txt.gz · Last modified: 03 Nov 2017 09:07 by Angelo Nikko Catapang