+

+

+

− −

4.096V

0.1

µF

+5V

Zero Adj.

K−Type

Thermocouple

40.7

µV/_C

R

2

549

Ω

R

9

150k

Ω

R

5

31.6k

Ω

R

1

6.04k

Ω

R

6

200

Ω

+5V

0.1

µF

R

2

2.94k

Ω

V

O

R

3

60.4

Ω

R

4

6.04k

Ω

O PA333A

D1

REF3140

R

1

V

EX

V

OUT

V

REF

R

1

OPA333A

R

R

R R

+5V

OPA333A-EP

,, OPA2333A-EP

SGLS383B – APRIL 2007 – REVISED JUNE 2008 ............................................................................................................................................................ www.ti.com

Figure 3. Temperature Measurement

Figure 4 shows the basic configuration for a bridge amplifier.

Figure 4. Single Op-Amp Bridge Amplifier

A low-side current shunt monitor is shown in Figure 5. RN are operational resistors used to isolate the ADS1100

from the noise of the digital I2C bus. Since the ADS1100 is a 16-bit converter, a precise reference is essential for

maximum accuracy. If absolute accuracy is not required, and the 5-V power supply is sufficiently stable, the

REF3130 may be omitted.

10

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