CN0287 4-Channel Temperature Measurement Circuit


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

The 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

Common Photodiode Op-Amp Circuit Problems and Solutions Power Line Monitoring Weigh Scale Introduction

CN0287, 4-Channel Temperature Measurement Circuit

Manufacturer Part Number Description Available Quantity Datasheets
AD5201BRMZ10 IC DGTL POT 10K 33POS 10-MSOP 543
AD7193BCPZ IC ADC 24BIT SPI 4.8KHZ 32LFCSP 66
AD7193BRUZ IC ADC 24BIT SPI 4.8K 28-TSSOP 837
AD8603AUJZ-REEL7 IC OPAMP GP 400KHZ RRO TSOT23-5 14886
ADG702BRMZ IC SWITCH SPST 8MSOP 329
ADG738BRUZ IC MUX/DEMUX 8X1 16TSSOP 3022
ADR3440ARJZ-R2 IC VREF SERIES 4.096V SOT23-6 762
ADT7310TRZ IC TEMP SENSOR 16BIT SPI 8SOIC 384
ADUM1280ARZ IC DGTL ISO 2CH LOGIC 8SOIC 715
ADUM1280BRZ IC DGTL ISO 2CH LOGIC 8SOIC 196
ADUM1280CRZ IC DGTL ISO 2CH LOGIC 8SOIC 432
ADUM5401ARWZ IC DGTL ISO 4CH LOGIC 16SOIC 3539
ADUM5401CRWZ IC DGTL ISO 4CH LOGIC 16SOIC 572
EVAL-AD7193EBZ EVAL BOARD FOR AD7193 3
EVAL-CN0287-SDPZ EVAL BOARD 4-CH TEMP MEASUREMENT 4
EVAL-SDP-CB1Z BOARD EVALUATION FOR SDP-CB1 5