Thermocouple Conditioner and
Setpoint Controller
a
AD596*/AD597*
FUNCTIO NAL BLO CK D IAGRAM
FEATURES
Low Cost
TO -100
Operates w ith Type J (AD596) or Type K (AD597)
Therm ocouples
–ALM
Built-In Ice Point Com pensation
Tem perature Proportional Operation – 10 m V/؇C
Tem perature Setpoint Operation – ON/ OFF
Program m able Sw itching Hysteresis
High Im pedance Differential Input
–IN
+ALM
–
G
V+
+IN
+
ICE
POINT
COMP
–
+
+ A
G
+
GENERAL D ESCRIP TIO N
AD596/
AD597
V
OUT
HYS
T he AD596/AD597 is a monolithic temperature setpoint con-
troller that has been optimized for use at elevated temperatures
such as those found in oven control applications. T he device
cold junction compensates and amplifies a type J or K thermo-
couple input to derive an internal signal proportional to tem-
perature. The internal signal is then compared with an externally
applied setpoint voltage to yield a low impedance switched output
voltage. Dead-Band or switching hysteresis can be programmed
using a single external resistor. Alternately, the AD596/AD597 can
be configured to provide a voltage output (10 mV/°C) directly from
a type J or K thermocouple signal. It can also be used as a stand-
alone voltage output temperature sensor.
FB
GND
V–
SO IC
AD597
–IN
+IN
1
2
3
4
8
7
6
5
–
–
+
+
G
+
V+
V
HYS
GND
V–
+
A
T he AD596/AD597 can be powered with a single supply from
+5 V to +30 V, or dual supplies up to a total span of 36 V.
T ypical quiescent supply current is 160 µA, which minimizes
self-heating errors.
G
OUT
T he AD596/AD597 H package option includes a thermocouple
failure alarm that indicates an open thermocouple lead when
operated in the temperature proportional measurement mode.
T he alarm output has a flexible format which can be used to
drive relays, LEDs or T T L logic.
FB
ICE POINT
COMP
TOP VIEW
(Not to Scale)
T he device is packaged in a reliability qualified, cost effective
10-pin metal can or SOIC and is trimmed to operate over an
ambient temperature range from +25°C to +100°C. Operation
over an extended ambient temperature range is possible with
slightly reduced accuracy. T he AD596 will amplify thermo-
couple signals covering the entire –200°C to +760°C tempera-
ture range recommended for type J thermocouples while the
AD597 can accommodate –200°C to +1250°C type K inputs.
P RO D UCT H IGH LIGH TS
1. T he AD596/AD597 provides cold junction compensation
and a high gain amplifier which can be used as a setpoint
comparator.
2. T he input stage of the AD596/AD597 is a high quality in-
strumentation amplifier that allows the thermocouple to float
over most of the supply voltage range.
3. Linearization not required for thermocouple temperatures
T he AD596/AD597 has a calibration accuracy of ±4°C at an
ambient temperature of 60°C and an ambient temperature
stability specification of 0.05°C/°C from +25°C to +100°C. If
higher accuracy, or a lower ambient operating temperature is
required, either the AD594 (J thermocouple) or AD595 (K
thermocouple) should be considered.
close to 175°C (+100°C to +540°C for AD596).
4. Cold junction compensation is optimized for ambient tem-
peratures ranging from +25°C to +100°C.
5. In the stand-alone mode, the AD596/AD597 produces an
output voltage that indicates its own temperature.
*P r otected by U.S. P atent No. 4,029,974.
REV. B
Inform ation furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assum ed by Analog Devices for its
use, nor for any infringem ents of patents or other rights of third parties
which m ay result from its use. No license is granted by im plication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norw ood, MA 02062-9106, U.S.A.
Tel: 781/ 329-4700
Fax: 781/ 326-8703
World Wide Web Site: http:/ / w w w .analog.com
© Analog Devices, Inc., 1998
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