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tÉlÉcharger ad594 datasheet pdf

a
Monolithic Thermocouple Amplifiers
with Cold Junction Compensation
AD594/AD595
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/ⴗC
Built-In Ice Point Compensation
Wide Power Supply Range: +5 V to ⴞ15 V
Low Power: <1 mW typical
Thermocouple Failure Alarm
Laser Wafer Trimmed to 1ⴗC Calibration Accuracy
Setpoint Mode Operation
Self-Contained Celsius Thermometer Operation
High Impedance Differential Input
Side-Brazed DIP or Low Cost Cerdip
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 thermocouple 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.
FUNCTIONAL BLOCK DIAGRAM
–IN
14
–ALM
13
+ALM
12
V+
11
COMP
10
VO
9
FB
8
OVERLOAD
DETECT
AD594/AD595
+A
ICE
POINT
COMP. –TC
G
G
+TC
1
2
3
4
5
6
7
+IN
+C
+T
COM
–T
–C
V–
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 calibration 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
± 3°C, respectively. Both are designed to be used from 0°C to
+50°C, and are available in 14-pin, hermetically sealed, sidebrazed ceramic DIPs as well as low cost cerdip packages.
PRODUCT HIGHLIGHTS
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.
1. The AD594/AD595 provides cold junction compensation,
amplification, and an output buffer in a single IC package.
The AD594/AD595 can be powered from a single ended supply
(including +5 V) and by including a negative supply, temperatures below 0°C can be measured. To minimize self-heating, an
unloaded AD594/AD595 will typically operate with a total supply current 160 µA, but is also capable of delivering in excess of
± 5 mA to a load.
3. Flexible pinout provides for operation as a setpoint controller or a stand-alone temperature transducer calibrated in
degrees Celsius.
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
2. Compensation, zero, and scale factor are all precalibrated by
laser wafer trimming (LWT) of each IC chip.
4. Operation at remote application sites is facilitated by low
quiescent current and a wide supply voltage range +5 V to
dual supplies spanning 30 V.
5. Differential input rejects common-mode noise voltage on the
thermocouple leads.
REV. C
Information furnished by Analog Devices is believed to be accurate and