ISA

COEFFICIENT

TYPE

MATERIAL

(µV/ C)

R

°

E

+ Chromel

58.5

66.5k

– Constantan

J

+ Iron

50.2

76.8k

– Constantan

K

+ Chromel

39.4

97.6k

– Alumel

T

+ Copper

38.0

102k

– Constantan

REF102

R

2

R

3

Pt100

Cu

Cu

V+

K

6

10.0V

4

2

INA118

V

O

Ref

100

= RTD at 0°C

R

G

INA118

R

G

V

O

C

1

0.1µF

OPA602

Ref

R

1

1M

f

–3dB

=

1

2 R

π

= 1.59Hz

V

IN

+

–

INA118

www.ti.com

SBOS027A – SEPTEMBER 2000 – REVISED JANUARY 2016

9 Power Supply Recommendations

9.1 Low Voltage Operation

The INA118 can be operated on power supplies as low as ±1.35 V. Performance of the INA118 remains

excellent with power supplies ranging from ±1.35 V to ±18 V. Most parameters vary only slightly throughout this

supply voltage range; see Typical Characteristics. Operation at low supply voltage requires careful attention to

assure that the input voltages remain within their linear range. Voltage swing requirements of internal nodes limit

the input common-mode range with low power supply voltage. Figure 3 shows the range of linear operation for a

various supply voltages and gains.

Figure 31. AC-Coupled Instrumentation Amplifier

Figure 32. Thermocouple Amplifier With Cold Junction Compensation

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