REF102

R

2

R

1

Pt100

Cu

Cu

V+

K

6

10.0V

4

2

INA129

V

O

Ref

R

R3

G

100Ω = Pt100 at 0°C

ISA

TYPE

MATERIAL

SEEBECK

COEFFICIENT

( V/°C)

m

R , R

1

2

E

J

K

T

+Chromel

-Constantan

+Iron

-Constantan

+Chromel

-Alumel

+Copper

-Constantan

58.5

50.2

39.4

38

66.5k

76.8k

97.6k

102k

W

W

W

W

INA129

R

G

V

O

OPA13 0

Ref

R

1

1MW

=

1

2pR C

1

1

= 1.59 Hz

V

IN

+

f-3dB

C1

0.1 F

m

-

300W

+5V

R

G

INA129

V

O

Ref

2.5V

∆V

2.5V + ∆V

-

INA128-HT, INA129-HT

SBOS501F – JANUARY 2010 – REVISED FEBRUARY 2015

www.ti.com

10 Power Supply Recommendations

The minimum power supply voltage for INA12x is ±2.25 V and the maximum power supply voltage is ±18 V. This

minimum and maximum range covers a wide range of power supplies; but for optimum performance, ±15 V is

recommended. TI recommends adding a bypass capacitor at the input to compensate for the layout and power

supply source impedance.

10.1 Low Voltage Operation

The INA128-HT and INA129-HT can be operated on power supplies as low as ±2.25 V. Performance remains

excellent with power supplies ranging from ±2.25 V to ±18 V. Most parameters vary only slightly throughout this

supply voltage range.

Operation at very 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 6 and Figure 7 show the range of linear operation for ±15 V, ±5 V, and ±2.5 V

supplies.

(1)

OPA130 is not tested or characterized at 210°C.

Figure 27. Bridge Amplifier

Figure 28. AC-Coupled Instrumentation Amplifier

(1)

REF102 is not tested or characterized at 210°C.

Figure 29. Thermocouple Amplifier With RTD Cold-Junction Compensation

20

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