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AD8494ARMZ Fiches technique(PDF) 1 Page - Analog Devices

No de pièce AD8494ARMZ
Description  Precision Thermocouple Amplifiers with Cold Junction Compensation
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

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Precision Thermocouple Amplifiers
with Cold Junction Compensation
AD8494/AD8495/AD8496/AD8497
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2010 Analog Devices, Inc. All rights reserved.
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
and 0.025°C/°C ambient temperature rejection
Low power: <1 mW at VS = 5 V
Wide power supply range
Single supply: 2.7 V to 36 V
Dual supply: ±2.7 V to ±18 V
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
FUNCTIONAL BLOCK DIAGRAM
+IN
–IN
OUT
REF
A1
A2
AD8494/AD8495/
AD8496/AD8497
A3
SENSE
ESD AND
OVP
ESD AND
OVP
COLD JUNCTION
COMPENSATION
1M
THERMO-
COUPLE
Figure 1.
Table 1. Device Temperature Ranges
Part No.
Thermo-
couple
Type
Optimized Temperature Range
Ambient Temperature
(Reference Junction)
Measurement
Junction
AD8494
J
0°C to 50°C
Full J type range
AD8495
K
0°C to 50°C
Full K type range
AD8496
J
25°C to 100°C
Full J type range
AD8497
K
25°C to 100°C
Full K type range
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.
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
1.
Complete, precision laser wafer trimmed thermocouple
signal conditioning system in a single IC package.
2.
Flexible pinout provides for operation as a setpoint
controller or as a standalone Celsius thermometer.
3.
Rugged inputs withstand 4 kV ESD and provide over-
voltage protection (OVP) up to VS ± 25 V.
4.
Differential inputs reject common-mode noise on the
thermocouple leads.
5.
Reference pin voltage can be offset to measure 0°C on
single supplies.
6.
Available in a small, 8-lead MSOP that is fully RoHS compliant.


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