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Technical content

information and/or support, visit www.analog.com/CN0357. Fax: 781.461.3113 ©2014 Analog Devices, Inc. All rights reserved. without changing the bill of materials. voltage with 0.1% accuracy and 8 ppm/°C drift. with a 16-bit ADC, such as the AD7790. Figure 1. Low Noise Gas Detector Circuit (Simplified Schematic: all Connections and Decoupling not Shown)

output is 18 µV p-p, as shown in Equation 5. buffer of the AD7790 can be used in its place. threshold voltage (~2.0 V) of the JFET. ADA4505-2 is greater than that of the ADA4528-2. More information can be found in Circuit Note CN-0234.

  • PC with USB port and Windows® XP, or Windows Vista (32-bit), or Windows 7 (32-bit)
  • E VA L-CN0357-PMDZ evaluation board
  • PMD-SDP-IB1Z interposer Board
  • E VA L-SDP-CB1Z controller board
  • CN-0357 Evaluation Software
  • Calibration gas (less than 250 ppm)
  • E VA L-CFTL-6V-PWRZ or equivalent 6 VDC power supply Getting Started Load the evaluation software by placing the CN-0357 Evaluation Software CD into the CD drive of the PC. Using My Computer, locate the drive that contains the evaluation software CD and run the setup.exe. Follow the on screen prompts for installing and using the evaluation software. Functional Block Diagram A functional block diagram of the test setup is shown in Figure 3. There is a complete schematic of the evaluation board contained in the CN-0357 Design Support Package, including printouts of the gerber files, as well as a bill of materials. EVAL-SDP-CB1Z CON A OR CON B USB PC USB EVAL-CN0357-PMDZ 120-PIN SDP +6V POWER PMD-SDP-IB1Z 12-PIN 120-PIN SDP SENSOR CO-AX 12332-003

Figure 3. Test Setup Functional Block Diagram

Rev. 0 | Page 5 of 5 LEARN MORE CN-0357 Design Support Package: http://www.analog.com/CN0357-DesignSupport AN-1114, Lowest Noise Zero-Drift Amplifier Has 5.6 nV/√Hz Voltage Noise Density, Analog Devices. MS-2066 Article, Low Noise Signal Conditioning for Sensor- Based Circuits, Analog Devices. MT-035 Tutorial, Op Amp Inputs, Outputs, Single-Supply, and Rail-to-Rail Issues, Analog Devices. CN-0234 Circuit Note, Single Supply, Micropower Toxic Gas Detector Using an Electrochemical Sensor, Analog Devices. Alphasense Application Note AAN-105-03, Designing a Potentiostatic Circuit, Alphasense Limited. Data Sheets and Evaluation Boards CN-0357 Circuit Evaluation Boa rd ( E VA L-CN0357-PMDZ) System Demonstration Platform (EV AL-SDP-CB1Z) ADA4528-2 Data Sheet AD5270-20 Data Sheet ADR3412 Data Sheet AD8500 Data Sheet AD7790 Data Sheet

REVISION HISTORY

7/14—Revision 0: Initial Version (Continued from first page) Circuits from the Lab reference designs are intended only for use with Analog Devices products and are the intellectual property of Analog Devices or its licensors. While you may use the Circuits from the Lab reference designs in the design of your product, no other license is granted by implication or otherwise under any patents or other intellectual property by application or use of the Circuits from the Lab reference designs. Information furnished by Analog Devices is believed to be accurate and reliable. However, Circuits from the Lab reference designs are supplied "as is" and without warranties of any kind, express, implied, or statutory including, but n ot limited to, any implied warranty of merchantability, noninfringement or fitness for a particular purpose and no responsibility is assumed by Analog Devices for their use, nor for any infringements of patents or other rights of third parties that may result from their use. Analog Devices reserves the right to change any Circuits from the Lab reference designs at any time without notice but is under no obligation to do so. ©2014 Analog Devices, Inc. All righ ts reserved. Trademarks and registered trademarks are the property of their respective owners. CN12332-0-7/14(0)