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Analog Devices Semiconductor Electronic Components Datasheet

AD595 Datasheet

Monolithic Thermocouple Amplifiers with Cold Junction Compensation

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AD595 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/؇C
Built-In Ice Point Compensation
Wide Power Supply Range: +5 V to ؎15 V
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
FUNCTIONAL BLOCK DIAGRAM
–IN –ALM +ALM
14 13 12
AD594/AD595
V+ COMP
11 10
OVERLOAD
DETECT
+A
VO
9
FB
8
GG
ICE
POINT
COMP. –TC
+TC
12 3 4 56 7
+IN +C +T COM –T –C V–
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 µA, but is also capable of delivering in excess of
± 5 mA to a load.
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
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
± 3°C, respectively. Both are designed to be used from 0°C to
+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,
amplification, and an output buffer in a single IC package.
2. Compensation, zero, and scale factor are all precalibrated by
laser wafer trimming (LWT) of each IC chip.
3. Flexible pinout provides for operation as a setpoint control-
ler or a stand-alone temperature transducer calibrated in
degrees Celsius.
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
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1999


Analog Devices Semiconductor Electronic Components Datasheet

AD595 Datasheet

Monolithic Thermocouple Amplifiers with Cold Junction Compensation

No Preview Available !

AD595 pdf
AD594/AD595–SPECIFICATIONS (@ +25؇C and VS = 5 V, Type J (AD594), Type K (AD595) Thermocouple,
unless otherwise noted)
Model
AD594A
Min Typ Max
ABSOLUTE MAXIMUM RATING
+VS to –VS
Common-Mode Input Voltage
Differential Input Voltage
Alarm Voltages
+ALM
–ALM
Operating Temperature Range
Output Short Circuit to Common
–VS – 0.15
–VS
–VS
–VS
–55
Indefinite
36
+VS
+VS
–VS + 36
+VS
+125
TEMPERATURE MEASUREMENT
(Specified Temperature Range
0°C to +50°C)
Calibration Error at +25°C1
Stability vs. Temperature2
Gain Error
Nominal Transfer Function
؎3
؎0.05
؎1.5
10
AMPLIFIER CHARACTERISTICS
Closed Loop Gain3
Input Offset Voltage
Input Bias Current
Differential Input Range
Common-Mode Range
Common-Mode Sensitivity – RTO
Power Supply Sensitivity – RTO
Output Voltage Range
Dual Supply
Single Supply
Usable Output Current4
3 dB Bandwidth
193.4
(Temperature in °C) ×
51.70 µV/°C
0.1
–10 +50
–VS – 0.15
–VS – 4
10
10
–VS + 2.5
0
±5
15
+VS – 2
+VS – 2
ALARM CHARACTERISTICS
VCE(SAT) at 2 mA
Leakage Current
Operating Voltage at – ALM
Short Circuit Current
0.3
؎1
+VS – 4
20
POWER REQUIREMENTS
Specified Performance
Operating5
Quiescent Current (No Load)
+VS
–VS
PACKAGE OPTION
TO-116 (D-14)
Cerdip (Q-14)
+VS = 5, –VS = 0
+VS to –VS 30
160 300
100
AD594AD
AD594AQ
AD594C
Min Typ Max
–VS – 0.15
–VS
–VS
–VS
–55
Indefinite
36
+VS
+VS
–VS + 36
+VS
+125
؎1
؎0.025
؎0.75
10
193.4
(Temperature in °C) ×
51.70 µV/°C
0.1
–VS – 0.15
–VS – 4
10
10
–VS + 2.5
0
±5
15
+VS – 2
–VS – 2
0.3
؎1
+VS – 4
20
+VS = 5, –VS = 0
+VS to –VS 30
160 300
100
AD594CD
AD594CQ
AD595A
Min Typ Max
AD595C
Min Typ Max
–VS – 0.15
–VS
–VS
–VS
–55
Indefinite
36
+VS –VS – 0.15
+VS –VS
–VS + 36
+VS
+125
–VS
–VS
–55
Indefinite
36
+VS
+VS
–VS + 36
+VS
+125
؎3
؎0.05
؎1.5
10
؎1
؎0.025
؎0.75
10
247.3
(Temperature in °C) ×
40.44 µV/°C
0.1
–10 +50
–VS – 0.15
–VS – 4
10
10
247.3
(Temperature in °C) ×
40.44 µV/°C
0.1
–10 +50
–VS – 0.15
–VS – 4
10
10
–VS + 2.5
0
±5
15
+VS – 2
+VS + 2
–VS + 2.5
0
±5
15
+VS – 2
+VS – 2
0.3
؎1
+VS – 4
20
0.3
؎1
+VS – 4
20
+VS = 5, –VS = 0
+VS to –VS 30
160 300
100
+VS = 5, –VS = 0
+VS to –VS 30
160 300
100
AD595AD
AD595AQ
AD595CD
AD595CQ
Units
Volts
Volts
Volts
Volts
Volts
°C
°C
°C/°C
%
mV/°C
µV
µA
mV
Volts
mV/V
mV/V
Volts
Volts
mA
kHz
Volts
µA max
Volts
mA
Volts
Volts
µA
µA
NOTES
1Calibrated for minimum error at +25°C using a thermocouple sensitivity of 51.7 µV/°C. Since a J type thermocouple deviates from this straight line approximation, the AD594 will normally
read 3.1 mV when the measuring junction is at 0°C. The AD595 will similarly read 2.7 mV at 0°C.
2Defined as the slope of the line connecting the AD594/AD595 errors measured at 0°C and 50°C ambient temperature.
3Pin 8 shorted to Pin 9.
4Current Sink Capability in single supply configuration is limited to current drawn to ground through a 50 kresistor at output voltages below 2.5 V.
5–VS must not exceed –16.5 V.
Specifications shown in boldface are tested on all production units at final electrical test. Results from those tests are used to calculate outgoing quality levels. All min and max specifications
are guaranteed, although only those shown in boldface are tested on all production units.
Specifications subject to change without notice.
INTERPRETING AD594/AD595 OUTPUT VOLTAGES
To achieve a temperature proportional output of 10 mV/°C and
accurately compensate for the reference junction over the rated
operating range of the circuit, the AD594/AD595 is gain trimmed
to match the transfer characteristic of J and K type thermocouples
at 25°C. For a type J output in this temperature range the TC is
51.70 µV/°C, while for a type K it is 40.44 µV/°C. The resulting
gain for the AD594 is 193.4 (10 mV/°C divided by 51.7 µV/°C)
and for the AD595 is 247.3 (10 mV/°C divided by 40.44 µV/°C).
In addition, an absolute accuracy trim induces an input offset to
the output amplifier characteristic of 16 µV for the AD594 and
11 µV for the AD595. This offset arises because the AD594/
AD595 is trimmed for a 250 mV output while applying a 25°C
thermocouple input.
Because a thermocouple output voltage is nonlinear with respect
to temperature, and the AD594/AD595 linearly amplifies the
compensated signal, the following transfer functions should be
used to determine the actual output voltages:
AD594 output = (Type J Voltage + 16 µV) × 193.4
AD595 output = (Type K Voltage + 11 µV) × 247.3 or conversely:
Type J voltage = (AD594 output/193.4) – 16 µV
Type K voltage = (AD595 output/247.3) – 11 µV
Table I lists the ideal AD594/AD595 output voltages as a func-
tion of Celsius temperature for type J and K ANSI standard
thermocouples, with the package and reference junction at
25°C. As is normally the case, these outputs are subject to cali-
bration, gain and temperature sensitivity errors. Output values
for intermediate temperatures can be interpolated, or calculated
using the output equations and ANSI thermocouple voltage
tables referred to zero degrees Celsius. Due to a slight variation
in alloy content between ANSI type J and DIN FE-CUNI
–2– REV. C


Part Number AD595
Description Monolithic Thermocouple Amplifiers with Cold Junction Compensation
Maker Analog Devices
Total Page 8 Pages
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