AD594AQ Analog Devices Inc, AD594AQ Datasheet

AD594AQ

Manufacturer Part Number

AD594AQ

Description

IC THERMOCOUPLE A W/COMP 14CDIP

Manufacturer

Analog Devices Inc

Type

Low Powerr

Datasheets

1.AD595AQ.pdf (8 pages)

2.AD594AQ.pdf (4 pages)

Specifications of AD594AQ

Mounting Type

Through Hole

Rohs Status

RoHS non-compliant

Function

Thermocouple Amplifier

Topology

Ice Point Compensation, Overload Detection

Sensor Type

External

Output Type

Voltage

Output Alarm

Yes

Output Fan

Voltage - Supply

5 V ~ ±15 V

Operating Temperature

-55°C ~ 125°C

Package / Case

14-CDIP (0.300", 7.62mm)

Ic Output Type

Voltage

Sensing Accuracy Range

Â± 3Â°C

Supply Current

160ÂµA

Supply Voltage Range

5V To 30V

Sensor Case Style

DIP

No. Of Pins

Temperature Sensor Function

Temp Sensor

Operating Temperature (max)

125C

Operating Temperature Classification

Military

Operating Supply Voltage (typ)

Operating Supply Voltage (max)

5.5V

Amplifier Type

Instrumentation

Bandwidth

15 kHz

Converter Type

Monolithic theremocouple amplifier

Current, Input Bias

0.1 μA

Current, Output

±5 mA

Current, Quiescent Supply

160 uA (Typ.) @ 25 °C

Current, Supply

160 μA

Package Type

CDIP-14

Temperature, Operating, Maximum

125 °C

Temperature, Operating, Minimum

-55 °C

Temperature, Operating, Range

-55 to +125 °C

Voltage, Supply

+5 to ±15 V

Low Impedance Voltage Output

10 mV⁄°C

Wide Power Supply Range

+ 5 V to 615 V

Low Power

1 mW typical

Temperature Sensing Range

-55Â°C To +125Â°C

Rohs Compliant

Sensing Temperature

Lead Free Status / Rohs Status

Not Compliant

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REV. C

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

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

PRODUCT DESCRIPTION

The AD594/AD595 is a complete instrumentation amplifier and

thermocouple cold junction compensator on a monolithic chip.

It combines an ice point reference with a precalibrated amplifier

to produce a high level (10 mV/ C) output directly from a ther-

mocouple signal. Pin-strapping options allow it to be used as a

linear amplifier-compensator or as a switched output setpoint

controller using either fixed or remote setpoint control. It can

be used to amplify its compensation voltage directly, thereby

converting it to a stand-alone Celsius transducer with a low

impedance voltage output.

The AD594/AD595 includes a thermocouple failure alarm that

indicates if one or both thermocouple leads become open. The

alarm output has a flexible format which includes TTL drive

capability.

The AD594/AD595 can be powered from a single ended supply

(including +5 V) and by including a negative supply, tempera-

tures below 0 C can be measured. To minimize self-heating, an

unloaded AD594/AD595 will typically operate with a total sup-

ply current 160 A, but is also capable of delivering in excess of

The AD594 is precalibrated by laser wafer trimming to match

the characteristic of type J (iron-constantan) thermocouples and

the AD595 is laser trimmed for type K (chromel-alumel) inputs.

The temperature transducer voltages and gain control resistors

5 mA to a load.

FEATURES

Pretrimmed for Type J (AD594) or

Can Be Used with Type T Thermocouple Inputs

Low Impedance Voltage Output: 10 mV/ C

Built-In Ice Point Compensation

Wide Power Supply Range: +5 V to

Low Power: <1 mW typical

Thermocouple Failure Alarm

Laser Wafer Trimmed to 1 C Calibration Accuracy

Setpoint Mode Operation

Self-Contained Celsius Thermometer Operation

High Impedance Differential Input

Side-Brazed DIP or Low Cost Cerdip

Type K (AD595) Thermocouples

15 V

Monolithic Thermocouple Amplifiers

with Cold Junction Compensation

are available at the package pins so that the circuit can be

recalibrated for the thermocouple types by the addition of two

or three resistors. These terminals also allow more precise cali-

bration for both thermocouple and thermometer applications.

The AD594/AD595 is available in two performance grades. The

C and the A versions have calibration accuracies of 1 C and

+50 C, and are available in 14-pin, hermetically sealed, side-

brazed ceramic DIPs as well as low cost cerdip packages.

PRODUCT HIGHLIGHTS

1. The AD594/AD595 provides cold junction compensation,

2. Compensation, zero, and scale factor are all precalibrated by

3. Flexible pinout provides for operation as a setpoint control-

4. Operation at remote application sites is facilitated by low

5. Differential input rejects common-mode noise voltage on the

3 C, respectively. Both are designed to be used from 0 C to

amplification, and an output buffer in a single IC package.

laser wafer trimming (LWT) of each IC chip.

ler or a stand-alone temperature transducer calibrated in

degrees Celsius.

quiescent current and a wide supply voltage range +5 V to

dual supplies spanning 30 V.

thermocouple leads.

+IN

–IN

FUNCTIONAL BLOCK DIAGRAM

AD594/AD595

–ALM

+ALM

COM

V+

OVERLOAD

DETECT

AD594/AD595

COMP

–T

+TC

–C

COMP.

POINT

ICE

V–

–TC

Related parts for AD594AQ

AD594AQ Summary of contents

Page 1

FEATURES Pretrimmed for Type J (AD594) or Type K (AD595) Thermocouples Can Be Used with Type T Thermocouple Inputs Low Impedance Voltage Output: 10 mV/ C Built-In Ice Point Compensation Wide Power Supply Range Low Power: ...

Page 2

... PACKAGE OPTION TO-116 (D-14) AD594AD Cerdip (Q-14) AD594AQ NOTES 1 Calibrated for minimum error at +25 C using a thermocouple sensitivity of 51 Since a J type thermocouple deviates from this straight line approximation, the AD594 will normally read 3.1 mV when the measuring junction The AD595 will similarly read 2 ...

Page 3

Table I. Output Voltage vs. Thermocouple Temperature (Ambient + Thermocouple Type J AD594 Temperature Voltage Output –200 –7.890 –1523 –180 –7.402 –1428 –160 –6.821 –1316 –140 –6.159 –1188 –120 –5.426 –1046 –100 –4.632 –893 –80 ...

Page 4

AD594/AD595 THERMOCOUPLE BASICS Thermocouples are economical and rugged; they have reason- ably good long-term stability. Because of their small size, they respond quickly and are good choices where fast response is im- portant. They function over temperature ranges from cryogenics ...

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