AD8497CRMZ Analog Devices Inc, AD8497CRMZ Datasheet

AD8497CRMZ

Manufacturer Part Number

AD8497CRMZ

Description

Thermocouple InAmp

Manufacturer

Analog Devices Inc

Datasheets

1.AD8495.pdf (16 pages)

2.AD8494ARMZ.pdf (16 pages)

Current page: 1 of 16
Download datasheet (487Kb)

FEATURES

Low cost and easy to use

Pretrimmed for J or K type thermocouples

Internal cold junction compensation

High impedance differential input

Standalone 5 mV/°C thermometer

Reference pin allows offset adjustment

Thermocouple break detection

Laser wafer trimmed to 1°C initial accuracy

Low power: <1 mW at V

Wide power supply range

Small, 8-lead MSOP

APPLICATIONS

J or K type thermocouple temperature measurement

Setpoint controller

Celsius thermometer

Universal cold junction compensator

White goods (oven, stove top) temperature measurements

Exhaust gas temperature sensing

Catalytic converter temperature sensing

GENERAL DESCRIPTION

The AD8494/AD8495/AD8496/AD8497 are precision instrumen-

tation amplifiers with thermocouple cold junction compensators

on an integrated circuit. They produce a high level (5 mV/°C)

output directly from a thermocouple signal by combining an

ice point reference with a precalibrated amplifier. They can be

used as standalone thermometers or as switched output setpoint

controllers using either a fixed or remote setpoint control.

The AD8494/AD8495/AD8496/AD8497 can be powered from a

single-ended supply (less than 3 V) and can measure temperatures

below 0°C by offsetting the reference input. To minimize self-

heating, an unloaded AD849x typically operates with a total

supply current of 180 μA, but it is also capable of delivering in

excess of ±5 mA to a load.

The AD8494 and AD8496 are precalibrated by laser wafer

trimming to match the characteristics of J type (iron-constantan)

thermocouples; the AD8495 and AD8497 are laser trimmed to

match the characteristics of K type (chromel-alumel) thermo-

couples. See Table 1 for the optimized ambient temperature

range of each part.

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

and 0.025°C/°C ambient temperature rejection

Single supply: 2.7 V to 36 V

Dual supply: ±2.7 V to ±18 V

= 5 V

Precision Thermocouple Amplifiers

with Cold Junction Compensation

AD8494/AD8495/AD8496/AD8497

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

Table 1. Device Temperature Ranges

Part No.

AD8494

AD8495

AD8496

AD8497

The AD8494/AD8495/AD8496/AD8497 allow a wide variety of

supply voltages. With a 5 V single supply, the 5 mV/°C output

allows the devices to cover nearly 1000 degrees of a thermo-

couple’s temperature range.

The AD8494/AD8495/AD8496/AD8497 work with 3 V supplies,

allowing them to interface directly to lower supply ADCs. They

can also work with supplies as large as 36 V in industrial systems

that require a wide common-mode input range.

PRODUCT HIGHLIGHTS

THERMO-

COUPLE

Complete, precision laser wafer trimmed thermocouple

signal conditioning system in a single IC package.

Flexible pinout provides for operation as a setpoint

controller or as a standalone Celsius thermometer.

Rugged inputs withstand 4 kV ESD and provide over-

voltage protection (OVP) up to V

Differential inputs reject common-mode noise on the

thermocouple leads.

Reference pin voltage can be offset to measure 0°C on

single supplies.

Available in a small, 8-lead MSOP that is fully RoHS compliant.

1MΩ

+IN

–IN

Thermo-

couple

Type

FUNCTIONAL BLOCK DIAGRAM

ESD AND

OVP

Ambient Temperature

(Reference Junction)

0°C to 50°C

25°C to 100°C

Optimized Temperature Range

Figure 1.

AD8494/AD8495/

AD8496/AD8497

COLD JUNCTION

COMPENSATION

± 25 V.

SENSE

www.analog.com

REF

Measurement

Junction

Full J type range

Full K type range

Full J type range

Full K type range

OUT

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