Analog Devices: CN0209 Reference Design for Fully Programmable Universal Analog Front End for Process Control Applications

Kit Overview   The EVAL-CN0209-SDPZEVAL-CN0209-SDPZ provides a fully programmable universal analog front end (AFE) for process control applications. The following inputs are supported: 2-, 3-, and 4- wire RTD configurations, thermocouple inputs with cold junction compensation, unipolar and bipolar input voltages, and 4 mA-to-20 mA inputs.   Today, many analog input modules use wire links (jumpers) to configure the customer input requirements. This requires time, knowledge, and manual intervention to configure and reconfigure the input. This circuit provides a software controllable switch to configure the modes along with a constant current source to excite the RTD. The circuit is also reconfigurable to set common mode voltages for the thermocouple configuration. A differential amplifier is used to condition the analog input voltage range to the Σ-Δ ADC. The circuit provides industry-leading performance and cost.   Because of the voltage gain provided by the AD8676AD8676 and AD8275AD8275, the design is particularly suitable for small signal inputs, all types of RTDs, or thermocouples. The AD7193AD7193 is a 24-bit Σ-Δ ADC that can be configured to have four differential inputs or eight pseudo differential inputs. The ADuM1400ADuM1400 and ADuM1401ADuM1401 provide all the necessary signal isolation between the microcontroller and the ADC. The circuit also includes standard external protection and is compliant with the IEC 61000 specifications.   This circuit uses the EVAL-CN0209-SDPZEVAL-CN0209-SDPZ circuit board and the EVAL-SDP-CB1ZEVAL-SDP-CB1Z System Demonstration Platform (SDP-B) (Should be purchased separately). The two boards have 120-pin mating connectors, allowing for the quick setup and evaluation of the circuit’s performance. The EVAL-CN0209-SDPZ board contains the circuit to be evaluated and the SDP evaluation board is used with the CN0209 evaluation software to capture the data from the EVAL-CN0209-SDPZ circuit board.   Key Applications: Electronic Test & Measurement, Programmable Logic Controllers/ Distributed Control Systems, Temperature Controllers

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Development Tools

• PC with a USB port and Windows XP or Windows Vista (32-bit) or Windows 7 (32-bit)
• EVAL-CN0209-SDPZEVAL-CN0209-SDPZ Circuit Evaluation Board
• EVAL-SDP-CB1ZEVAL-SDP-CB1Z SDP Evaluation Board
  • Blackfin Processor ADSP-BF527
  • USB 2.0 Interface to PC
  • JTAG header footprint
  • 32MB SDRAM
  • 2 x Small Footprint 120 Pin Connectors
  • Configurable Peripheral Interfaces - SPI - SPORT - I2C - GPIOs - Parallel - Timers

• CN0209 Evaluation Software
• Power supply: +15 V and –15 V
• RTD temperature sensor
• Thermocouple

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Technical Documents

Learning Center

Design Elements

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You don't have permission to edit metadata of this video. Edit media Dimensions x Small Medium Large Custom Subject (required) Brief Description Tags (separated by comma) Video visibility in search results Visible Hidden Parent content Analog Devices: CN0225 Reference Design for High Impedance, High CMR, ±10 V Analog Front End Signal Conditioner for Industrial Process Control and Automation Analog Devices: CN0209 Reference Design for Fully Programmable Universal Analog Front End for Process Control Applications Poster Upload Preview Ok Cancel

You don't have permission to edit metadata of this video. Edit media Dimensions x Small Medium Large Custom Subject (required) Brief Description Tags (separated by comma) Video visibility in search results Visible Hidden Parent content Analog Devices: CN0235 Reference Design for Fully Isolated Lithium Ion Battery Monitoring and Protection System Analog Devices: CN0225 Reference Design for High Impedance, High CMR, ±10 V Analog Front End Signal Conditioner for Industrial Process Control and Automation Analog Devices: CN0178 Reference Design for Software-Calibrated, 50 MHz to 9 GHz, RF Power Measurement System Analog Devices: CN0202 Reference Design for Flexible, High Accuracy, Low Drift, PLC/DCS Analog Output Module Analog Devices: EVAL-AD7291SDZ Evaluation Board for the AD7291 12-Bit SAR ADC with Temperature Sensor Analog Devices: CN0216 Reference Design for Precision Weigh Scale Design Using the AD7791 24-Bit Sigma-Delta ADC with External ADA4528-1 Zero-Drift Amplifiers Analog Devices: EVAL-AD5790SDZ Evaluation Board for the AD5790 20-Bit Voltage Output DAC Analog Devices: EVAL-AD5421SDZ Evaluation Board for the AD5421 16-Bit, Serial Input, Loop-Powered DAC Analog Devices: CN0271 Reference Design for K-Type Thermocouple Measurement System with Integrated Cold Junction Compensation Analog Devices: CN0206 Refernce Design for Complete Type Thermocouple Measurement System Analog Devices: CN0189 Reference Design for Tilt Measurement Using a Dual Axis Accelerometer Analog Devices: CN0204 Reference Design for Flexible, High Voltage, High Accuracy, Low Drift PLC/DCS Analog Output Module Analog Devices: CN0209 Reference Design for Fully Programmable Universal Analog Front End for Process Control Applications Analog Devices: CN0240 Reference Design for Bidirectional Isolated High-Side Current Sense with 270 V Common-Mode Rejection Analog Devices: CN0229 Reference Design for 4-Channel, Flexible, Configurable, Voltage, and Current Output Circuit for I/O Card and PLC Applications Analog Devices: EVAL-AD5755-1SDZ Evaluation Board for the AD5755-1 16-Bit Voltage Output DAC, Dynamic Power Control, HART Connectivity Analog Devices: EVAL-SDP-CS1Z System Demonstration Platform Controller Board Analog Devices: EVAL-AD5541ASDZ Evaluation Board for the AD5541A Serial-Input, Voltage-Output 16-bit nanoDAC Analog Devices: EVAL-AD5791SDZ Evaluation board for the AD5791 Voltage Output DAC Analog Devices: CN0203 Reference Design for Flexible PLC/DCS Analog Output Module Using AD5750-1 and AD5660-1 Analog Devices: CN0253 Reference Design for A Robust, Low Power, Battery Monitoring Circuit Front End Analog Devices: CN0241 Reference Design for High-Side Current Sensing with Input Overvoltage Protection Analog Devices: EVAL-AD9838SDZ Evaluation Board for the AD9838 Direct Digital Synthesis Analog Devices: EVAL-SDP-CB1Z Evaluation System Controller Board Analog Devices: EVAL-AD7988-5SDZ Evaluation Board for the AD7988-5 Ultra Lower Power 16 bit SAR ADC Analog Devices: CN0234 Reference Design for Single Supply, Micropower Toxic Gas Detector Using an Electrochemical Sensor Analog Devices: CN0261 Reference Design for Optimizing AC Performance in an 18-bit, 250 kSPS, PulSAR Measurement Circuit Analog Devices: EVAL-AD5694RSDZ Evaluation Board for the AD5694(R) Quad Channel Voltage Output DAC Analog Devices: EVAL-AD9837SDZ Evaluation Board for the AD9837 Programmable Waveform Generator Analog Devices: CN0218 Reference Design for 500 V Common-Mode Voltage Current Monitor Analog Devices: ADZS-BRKOUT-EX3 SDP Breakout Board Analog Devices: CN0254 Reference Design for Low Cost, 16-Bit, 250 kSPS, 8-Channel, Isolated Data Acquisition System Analog Devices: CN0255 Reference Design for A Complete Single-Supply, 16-Bit, 100 kSPS PulSAR ADC System Dissipates 8 mW Analog Devices: CN0150A Reference Design for Software Calibrated, 1 MHz to 8 GHz, 60 dB RF Power Measurement System Using the AD8318 Logarithmic Detector Analog Devices: CN0187 Reference Design for Crest Factor, Peak, and RMS RF Power Measurement Circuit Analog Devices: EVAL-AD5780SDZ Evaluation Board for the AD5780 Voltage Output DAC Analog Devices: EVAL-AD7176-2SDZ Evaluation Board for the AD7176-2 Sigma-Delta ADC Analog Devices: CN0194 Reference Design for Galvanically Isolated, 2-Channel, 16-Bit, Simultaneous Sampling, Daisy-Chained Data Acquisition System Analog Devices: CN0188 Reference Design for Low Cost, Level Shifted Low Side Current Monitor for Negative High Voltage Rails Analog Devices: CN0274 Reference Design for Ultralow Power Standalone Motion Switch Analog Devices: CN0251 Reference Design for A Flexible 4-Channel Analog Front End for Wide Dynamic Range Signal Conditioning Poster Upload Preview Ok Cancel

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Kit Features

Features of EVAL-CN0209-SDPZEVAL-CN0209-SDPZ Evaluation Board:

• The ADG1414ADG1414, a serially controlled octal SPST switch, is used to configure the selected measurement mode.
• Voltage Measurement
  • This circuit board supports the measurement of unipolar and bipolar signal ranges up to ±10 V
  • The AD8676AD8676 amplifier buffers the inputs before the gain stage.
  • The AD8275AD8275 is used to level shift the input signal and provides gain so that it matches the input range of the AD7193BRUZ.AD7193BRUZ..
  • The AD8275AD8275 output is biased with a common-mode voltage connected to its REF pin. This voltage is generated by the REF194REF194 precision 4.5 V reference.
• RTD Measurement
  • The transducer is a 1000 Ω platinum (Pt) RTD (resistive temperature device)
  • The most accurate arrangement is a 4-lead RTD configuration.

  • The AD8617AD8617 is a dual low noise amplifier so that it can drive both input channels available on the board and is configured as a current source when the RTD measurement mode is selected

• Thermocouple Measurement
  • In a thermocouple application, the voltage generated by the thermocouple is measured with respect to an absolute reference, provided externally to the ADC.

  • The cold junction compensation is implemented using the ADT7310ADT7310 16-bit temperature sensor.

  • The signal from the thermocouple is small, and to maximize the dynamic range in the circuit, the AD7193AD7193 is operated at its highest gain range of 128.
  • The common-mode voltage for the thermocouple measurement is provided by the AD8617AD8617 amplifier.
• 4 mA-to-20 mA Current Measurement
• Regulator and Reference Selection
  • The ADP1720ADP1720 acts as the 5 V regulator.
    • The ADP1720 is a high voltage micropower linear regulator particularly suitable for industrial application
  • The 4.5 V REF194REF194 acts as the reference and the E-grade device has an initial accuracy ±2 mV at 25°C and a drift of 5 ppm/°C maximum.
    • It is a low dropout device and consumes less than 45 μA, with performance specifications over −40°C to +125°C
• Isolation
  • The ADuM1400ADuM1400 and the ADuM1401ADuM1401 are quad-channel digital isolators based on Analog Devices’ iCoupler technology.
    • These are used to provide isolation between the field side and the system microcontroller, with an isolation rating of 2.5 kV rms
  • Four wires are used through the ADuM1400, all for transmit (SCLK, DIN, ADG1414BRUZADG1414BRUZ, ADT7310).
  • Four wires are used through the ADUM1401ARWZ.ADUM1401ARWZ.: one for transmit ( AD7193BRUZ.AD7193BRUZ.) and three for receive (INT1, INT2, DOUT). The DIN, DOUT, and SCLK lines are connected to the SPORT interface.

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Kit Contents

The Analog Devices EVAL-CN0209-SDPZEVAL-CN0209-SDPZ supplied with below contents:

• Evaluation Board

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