(@ +25؇C and VS = 5 V, Type J (AD594), Type K (AD595) Thermocouple,
unless otherwise noted)
AD594/AD595–SPECIFICATIONS
Model
AD594A
Typ
AD594C
Typ
AD595A
Typ
AD595C
Typ
Min
Max
Min
Max
Min
Max
Min
Max
Units
ABSOLUTE MAXIMUM RATING
+VS to –VS
Common-Mode Input Voltage
Differential Input Voltage
Alarm Voltages
36
+VS
+VS
36
+VS
+VS
36
+VS
+VS
36
+VS
+VS
Volts
Volts
Volts
–VS – 0.15
–VS
–VS – 0.15
–VS
–VS – 0.15
–VS
–VS – 0.15
–VS
+ALM
–ALM
–VS
–VS
–55
–VS + 36
+VS
+125
–VS
–VS
–55
–VS + 36
+VS
+125
–VS
–VS
–55
–VS + 36
+VS
+125
–VS
–VS
–55
–VS + 36
+VS
+125
Volts
Volts
°C
Operating Temperature Range
Output Short Circuit to Common Indefinite
Indefinite
Indefinite
Indefinite
TEMPERATURE MEASUREMENT
(Specified Temperature Range
0°C to +50°C)
Calibration Error at +25°C1
Stability vs. Temperature2
Gain Error
؎3
؎1
؎3
؎1
°C
°C/°C
%
؎0.05
؎1.5
10
؎0.025
؎0.75
10
؎0.05
؎1.5
10
؎0.025
؎0.75
10
Nominal Transfer Function
mV/°C
AMPLIFIER CHARACTERISTICS
Closed Loop Gain3
193.4
193.4
247.3
247.3
Input Offset Voltage
(Temperature in °C) ×
51.70 µV/°C
0.1
(Temperature in °C) ×
51.70 µV/°C
0.1
(Temperature in °C) ×
40.44 µV/°C
0.1
(Temperature in °C) ×
40.44 µV/°C
µV
µA
Input Bias Current
0.1
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
–10
–VS – 0.15
+50
–VS – 4
10
–10
–VS – 0.15
+50
–VS – 4
10
–10
–VS – 0.15
+50
–VS – 4
10
mV
–VS – 0.15
–VS – 4
10
10
Volts
mV/V
mV/V
10
10
10
–VS + 2.5
0
+VS – 2
+VS – 2
–VS + 2.5
0
+VS – 2
–VS – 2
–VS + 2.5
0
+VS – 2
+VS + 2
–VS + 2.5
0
+VS – 2
+VS – 2
Volts
Volts
mA
±5
15
±5
15
±5
15
±5
15
kHz
ALARM CHARACTERISTICS
V
CE(SAT) at 2 mA
0.3
20
0.3
20
0.3
20
0.3
20
Volts
µA max
Volts
mA
Leakage Current
Operating Voltage at – ALM
Short Circuit Current
؎1
+VS – 4
؎1
+VS – 4
؎1
+VS – 4
؎1
+VS – 4
POWER REQUIREMENTS
Specified Performance
Operating5
+VS = 5, –VS = 0
+VS to –VS ≤ 30
+VS = 5, –VS = 0
+VS to –VS ≤ 30
+VS = 5, –VS = 0
+VS to –VS ≤ 30
+VS = 5, –VS = 0
+VS to –VS ≤ 30
Volts
Volts
Quiescent Current (No Load)
+VS
–VS
160
100
300
160
100
300
160
100
300
160
100
300
µA
µA
PACKAGE OPTION
TO-116 (D-14)
Cerdip (Q-14)
AD594AD
AD594AQ
AD594CD
AD594CQ
AD595AD
AD595AQ
AD595CD
AD595CQ
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 kΩ resistor 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.
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
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.
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
Because a thermocouple output voltage is nonlinear with respect
to temperature, and the AD594/AD595 linearly amplifies the
in alloy content between ANSI type J and DIN FE-CUNI
–2–
REV. C
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