Analog Devices: CN0194 Reference Design for Galvanically Isolated, 2-Channel, 16-Bit, Simultaneous Sampling, Daisy-Chained Data Acquisition System

Kit Overview   This circuit provides galvanic isolation for high speed, high accuracy, simultaneous sampling analog-todigital conversion applications. The 16-bit AD7685AD7685 PulSAR ADC is versatile and allows monitoring of multiple channels through daisy chaining. An input circuit based on the AD8615AD8615 op amp level shifts, attenuates, and buffers a ±10 V industrial signal to match the input requirements of the ADC. The flexible circuit includes a precision ADR391ADR391 reference and two quadchannel ADuM1402 digital isolators to provide a compact and cost effective solution to a popular industrial data acquisition application.   The AD7685AD7685 is a 16-bit, charge redistribution successive approximation (SAR) analog-to-digital converter (ADC) that operates from a single VDD power supply from 2.3 V to 5.5 V. It contains a low power, high speed, 16-bit sampling ADC with no missing codes, no pipeline delay, an internal conversion clock, and a versatile serial interface port. The ADC also contains a low noise, wide bandwidth, short aperture delay, track-and-hold circuit.   The complete analog signal chain runs on a single 5 V supply. The ADR391BUJZ-R2ADR391BUJZ-R2 low dropout 2.5 V reference and the U13 rail-torail CMOS AD8615 op amp develop the 4.5 V reference voltage for the ADCs.   This circuit uses the EVAL-CN0194-SDPZEVAL-CN0194-SDPZ circuit board and the EVAL-SDP-CB1ZEVAL-SDP-CB1Z System Demonstration Platform (SDP-B) evaluation board. The two boards have 120-pin mating connectors, allowing for the quick setup and evaluation of the circuit’s performance. The EVAL-CN0194-SDPZ board contains the circuit to be evaluated and the SDP evaluation board is used with the CN0194 evaluation software to capture the data from the EVAL-CN0194-SDPZ circuit board.   Key Applications: Electronic Test & Measurement, Programmable Logic Controllers/ Distributed Control Systems

More Development Kits and Tools More Analog Devices Analog Development Kits Analog Devices MCU based Development Kits Development Platforms & Kits element14 Knode

Development Tools

• PC with a USB port and Windows XP, Windows Vista (32-bit), or Windows 7 (32-bit)
• EVAL-CN0194-SDPZEVAL-CN0194-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
• CN-0194 evaluation software
• Power supply: +6 V, or +6 V “wall wart” (EVAL-CFTL-6V-PWRZEVAL-CFTL-6V-PWRZ)
• Low distortion signal source, such as Audio Precision System Two 2322

Back to top

Technical Documents

Learning Center

Design Elements

Back to top

Video

Video 1

Video 2

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: CN0194 Reference Design for Galvanically Isolated, 2-Channel, 16-Bit, Simultaneous Sampling, Daisy-Chained Data Acquisition System 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

Back to top

Kit Features

Key Features for EVAL-CN0194-SDPZEVAL-CN0194-SDPZ Evaluation Board are as below:

• Provides galvanic isolation for high speed, high accuracy, simultaneous sampling analog-to-digital conversion applications
• The 16-bit AD7685 PulSAR ADC is versatile and allows monitoring of multiple channels through daisy chaining
  • Features for AD7685AD7685:
  • 16-bit resolution with no missing codes
  • Throughput: 250 kSPS
  • INL: ±0.6 LSB typical, ±2 LSB maximum (±0.003% of FSR)
  • SINAD: 93.5 dB @ 20 kHz
  • THD: −110 dB @ 20 kHz
  • Pseudo differential analog input range 0 V to VREF with VREF up to VDD
  • No pipeline delay
  • Single-supply operation 2.3 V to 5.5 V with 1.8 V to 5 V logic interface
  • Serial interface SPI-/QSPI-/MICROWIRE-/DSP-compatible
  • Daisy-chain multiple ADCs, BUSY indicator
  • Power dissipation: 1.4 μW @ 2.5 V/100 SPS, 1.35 mW @ 2.5 V/100 kSPS, 4 mW @ 5 V/100 kSPS
  • Standby current: 1 nA
• An input circuit based on the AD8615AD8615 op-amp level shifts, attenuates, and buffers a ±10 V industrial signal to match the input requirements of the ADC
• The flexible circuit includes a precision ADR391ADR391 reference and two quadchannel ADuM1402 digital isolators to provide a compact and cost effective solution to a popular industrial data acquisition application

Back to top

Kit Contents

The Analog Devices EVAL-CN0194-SDPZEVAL-CN0194-SDPZ kit is supplied with below contents:

• Evaluation Board

Back to top