CN0287 4-Channel Temperature Measurement Circuit

ADI's CN0287 is a completely isolated, 4-channel thermocouple/RTD temperature measurement circuit with 0.5° accuracy

Image of Analog Devices' CN0287 4-Channel Temperature Measurement Circuit Analog Devices' CN0287 is a completely isolated, 4-channel temperature measurement circuit optimized for performance, input flexibility, robustness, and low cost. It supports all types of thermocouples with cold junction compensation and any type of RTD (resistance temperature detector) with resistances up to 4 kΩ for 2-, 3-, or 4-wire connection configurations. The RTD excitation current is programmable for optimum noise and linearity performance. RTD measurements achieve 0.1°C accuracy (typical), and Type-K thermocouple measurements achieve 0.05°C typical accuracy because of the 16-bit ADT7310 digital temperature sensor used for cold-junction compensation. The circuit uses a four-channel AD7193 24-bit sigma-delta ADC with on-chip PGA for high-accuracy and low-noise. Low leakage transient voltage suppressors (TVS) and Schottky diodes provide input transient and overvoltage protection. The SPI-compatible digital inputs and outputs are isolated (2500 VRMS), and the circuit is operated on a fully isolated power supply. Evaluate this circuit using the EVAL-CN0287-SDPZ circuit board and the SDP-B (EVAL-SDP-CB1Z) system demonstration platform controller board. The two boards have 120-pin mating connectors, allowing for the quick setup and evaluation of the performance of the circuit. The EVAL-CN0287-SDPZ board contains the circuit to be evaluated and the SDP-B controller board is used with the CN0287 evaluation software to capture the data from the EVAL-CN0287-SDPZ circuit board.

Isolated 4-Channel, Thermocouple/RTD Temperature Measurement System

CN0287 4-Channel Temperature Measurement Circuit

ImageManufacturer Part NumberDescriptionAvailable Quantity
IC OPAMP GP 1 CIRCUIT TSOT5AD8603AUJZ-REEL7IC OPAMP GP 1 CIRCUIT TSOT50View Details
IC DGTL POT 10KOHM 33TAP 10MSOPAD5201BRMZ10IC DGTL POT 10KOHM 33TAP 10MSOP45 - ImmediateView Details
IC SWITCH SPST 8MSOPADG702BRMZIC SWITCH SPST 8MSOP349 - ImmediateView Details
SENSOR DIGITAL -55C-150C 8SOICADT7310TRZSENSOR DIGITAL -55C-150C 8SOIC1 - ImmediateView Details
IC ADC 24BIT SIGMA-DELTA 32LFCSPAD7193BCPZIC ADC 24BIT SIGMA-DELTA 32LFCSP0View Details
BOARD EVALUATION FOR SDP-CB1EVAL-SDP-CB1ZBOARD EVALUATION FOR SDP-CB1326 - ImmediateView Details
DGTL ISO 3000VRMS 2CH GP 8SOICADUM1280ARZDGTL ISO 3000VRMS 2CH GP 8SOIC2832 - ImmediateView Details
DGTL ISO 3000VRMS 2CH GP 8SOICADUM1280BRZDGTL ISO 3000VRMS 2CH GP 8SOIC1 - ImmediateView Details
DGTL ISO 2500VRMS 4CH GP 16SOICADUM5401WCRWZ-1DGTL ISO 2500VRMS 4CH GP 16SOIC0View Details
EVAL BOARD 4-CH TEMP MEASUREMENTEVAL-CN0287-SDPZEVAL BOARD 4-CH TEMP MEASUREMENT1 - ImmediateView Details
Published: 2014-01-15