21

Ω

0.1

µF

1

µF

0.1

µF

1

µF

Analog Input

Circuit

21

Ω

+VA

AGND

REFOUT

REFIN

REFM

+IN

−IN

ADS7882

Analog 5 V

AGND

AGND

21

Ω

ADS7882

21

Ω

+IN

−IN

150 pF

12

Ω

_

+

THS4031

604

Ω

130 pF

604

Ω

100

Ω

1 nF

1 k

Ω

3 k

Ω

2.5 V DC

Signal Input,

Bipolar, "1.25 V

AGND

AGND

21 W

12 W

21 W

ADS7882

+IN

–IN

150pF

_

+

THS4031

50 W

SignalInput

Unipolar0V–2.5V

ADS7882

SLAS630 – DECEMBER 2008 ........................................................................................................................................................................................... www.ti.com

Figure 34. Using Internal Reference

Figure 35. Typical Analog Input Circuit for Bipolar Signal

Figure 36. Typical Application Input Circuit for Unipolar Signal

22

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