AD595CD【PDF 2/8 页】IC THERMOCOUPLE INSTR AMP 14CDIP

AD594/AD595SPECIFICATIONS

REV. C

2

Model

AD594A

AD594C

AD595A

AD595C

Min

Typ Max

Min

Typ Max

Min

Typ Max

Min

Typ Max

Units

ABSOLUTE MAXIMUM RATING

+V

S

to V

S

36

Volts

Common-Mode Input Voltage

V

S

0.15

+V

S

V

S

0.15

+V

S

V

S

0.15

+V

S

V

S

0.15

+V

S

Volts

Differential Input Voltage

V

S

+V

S

V

S

+V

S

V

S

+V

S

V

S

+V

S

Volts

Alarm Voltages

+ALM

V

S

V

S

+ 36 V

S

V

S

+ 36 V

S

V

S

+ 36 V

S

V

S

+ 36

Volts

ALM

V

S

+V

S

V

S

+V

S

V

S

+V

S

V

S

+V

S

Volts

Operating Temperature Range

55

+125

55

+125

55

+125

55

+125

癈

Output Short Circuit to Common Indefinite

Indefinite

TEMPERATURE MEASUREMENT

(Specified Temperature Range

0癈 to +50癈)

Calibration Error at +25癈

1

3

1

3

1

Stability vs. Temperature

2

0.05

0.025

0.05

0.025

癈/癈

Gain Error

1.5

0.75

1.5

0.75

%

Nominal Transfer Function

10

mV/癈

AMPLIFIER CHARACTERISTICS

Closed Loop Gain

3

193.4

247.3

Input Offset Voltage

(Temperature in 癈) ?/DIV>

51.70 礦/癈

40.44 礦/癈

礦

Input Bias Current

0.1

礎

Differential Input Range

10

+50

10

+50

10

+50

mV

Common-Mode Range

V

S

0.15

V

S

4

V

S

0.15

V

S

4

V

S

0.15

V

S

4

V

S

0.15

V

S

4

Volts

Common-Mode Sensitivity RTO

10

mV/V

Power Supply Sensitivity RTO

10

mV/V

Output Voltage Range

Dual Supply

V

S

+ 2.5

+V

S

2

V

S

+ 2.5

+V

S

2

V

S

+ 2.5

+V

S

2

V

S

+ 2.5

+V

S

2

Volts

Single Supply

0

+V

S

2

0

V

S

2

0

+V

S

+ 2 0

+V

S

2

Volts

Usable Output Current

4

?

mA

3 dB Bandwidth

15

kHz

ALARM CHARACTERISTICS

V

CE(SAT)

at 2 mA

0.3

Volts

Leakage Current

1

礎 max

Operating Voltage at ALM

+V

S

4

+V

S

4

+V

S

4

+V

S

4

Volts

Short Circuit Current

20

mA

POWER REQUIREMENTS

Specified Performance

+V

S

= 5, V

S

= 0

+V

S

= 5, V

S

= 0

+V

S

= 5, V

S

= 0

+V

S

= 5, V

S

= 0

Volts

Operating

5

+V

S

to V

S

d 30

+V

S

to V

S

d 30

+V

S

to V

S

d 30

+V

S

to V

S

d 30

Volts

Quiescent Current (No Load)

+V

S

160

300

160

300

160

300

160

300

礎

V

S

100

礎

PACKAGE OPTION

TO-116 (D-14)

AD594AD

AD594CD

AD595AD

AD595CD

Cerdip (Q-14)

AD594AQ

AD594CQ

AD595AQ

AD595CQ

NOTES

1

Calibrated for minimum error at +25癈 using a thermocouple sensitivity of 51.7 礦/癈. 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癈. The AD595 will similarly read 2.7 mV at 0癈.

2

Defined as the slope of the line connecting the AD594/AD595 errors measured at 0癈 and 50癈 ambient temperature.

3

Pin 8 shorted to Pin 9.

4

Current Sink Capability in single supply configuration is limited to current drawn to ground through a 50 k& resistor at output voltages below 2.5 V.

5

V

S

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.

(@ +25C and V

S

= 5 V, Type J (AD594), Type K (AD595) Thermocouple,

unless otherwise noted)

INTERPRETING AD594/AD595 OUTPUT VOLTAGES

To achieve a temperature proportional output of 10 mV/癈 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癈. For a type J output in this temperature range the TC is

51.70 礦/癈, while for a type K it is 40.44 礦/癈. The resulting

gain for the AD594 is 193.4 (10 mV/癈 divided by 51.7 礦/癈)

and for the AD595 is 247.3 (10 mV/癈 divided by 40.44 礦/癈).

In addition, an absolute accuracy trim induces an input offset to

the output amplifier characteristic of 16 礦 for the AD594 and

11 礦 for the AD595. This offset arises because the AD594/

AD595 is trimmed for a 250 mV output while applying a 25癈

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 ?/SPAN>V) ?/SPAN> 193.4

AD595 output = (Type K Voltage + 11 ?/SPAN>V) ?/SPAN> 247.3 or conversely:

Type J voltage = (AD594 output/193.4) 16 ?/SPAN>V

Type K voltage = (AD595 output/247.3) 11 ?/SPAN>V

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癈. 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

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