AMP03

–6–

REV. F

ECM

+V

0.1 F

0.1 F

–V

GROUND REFERENCE 1

GROUND REFERENCE 2

(GROUND REFERENCE 2)

AMP03

Figure 1. AMP03 Serves to Reject Common-Mode Volt-

ages in Instrumentation Systems. Common-Mode Volt-

APPLICATIONS INFORMATION

The AMP03 represents a versatile analog building block. In

order to capitalize on the fast settling time, high slew rate, and

high CMR, proper decoupling and grounding techniques must

be employed. Figure 1 illustrates the use of 0.1

µF decoupling

capacitors and proper ground connections.

MAINTAINING COMMON-MODE REJECTION

In order to achieve the full common-mode rejection capability

of the AMP03, the source impedance must be carefully con-

trolled. Slight imbalances of the source resistance will result in

a degradation of dc CMR—even a 5

Ω imbalance will degrade

CMR by 20 dB. Also, the matching of the reactive source

impedance must be matched in order to preserve the CMRR

over frequency.

APPLICATION CIRCUITS

AMP03

R1

25k

R2

25k

R3

25k

R4

25k

Figure 2. Precision Difference Amplifier. Rejects

AMP03

Figure 3. Precision Unity-Gain Inverting Amplifier

AMP03

+15V

–10V OUT

0.1 F

REF10

+10V OUT

Figure 4.

10 V Precision Voltage Reference

+15V

–5V OUT

0.1 F

REF10

+5V OUT

AMP03

Figure 5.

5 V Precision Voltage Reference

AMP03

Figure 6. Precision Summing Amplifier

AMP03

R2

R1

2

Figure 7. Precision Summing Amplifier with Gain