5962-9563901MGA(RevE) 查看數據表（PDF） - Analog Devices

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5962-9563901MGA
(Rev.:RevE)

Precision, Unity-Gain Differential Amplifier

Analog Devices 

AMP03

VSIGNAL

ECM

+V

0.1␮F

(GROUND REFERENCE 2)

AMP03

VOUT = –VSIGNAL

–V

0.1␮F

GROUND REFERENCE 1 GROUND REFERENCE 2

Figure 20. AMP03 Serves to Reject Common-Mode Volt-

ages in Instrumentation Systems. Common-Mode Volt-

ages Occur Due to Ground Current Returns. VSIGNAL and

ECM Must Be Within the Common-Mode Range of AMP03.

APPLICATIONS INFORMATION

The AMP03 represents a versatile analog building block. In

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

CMR, proper decoupling and grounding techniques must be

employed. Figure 20 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 im-

pedance must be matched in order to preserve the CMRR over

frequency.

APPLICATION CIRCUITS

–IN E1

+IN E2

AMP03

R1

25k⍀

R2

25k⍀

R3

25k⍀

R4

25k⍀

E0 = E2–E1

Figure 21. Precision Difference Amplifier. Rejects

Common-Mode Signal = (E1 + E2)/2 by 100 dB

AMP03

E1

E0 = –E1

Figure 22. Precision Unity-Gain Inverting Amplifier

+15V

0.1␮F

REF10

AMP03

+10V OUT

–10V OUT

Figure 23. ؎10 V Precision Voltage Reference

+15V

0.1␮F

REF10

AMP03

+5V OUT

–5V OUT

Figure 24. ؎5 V Precision Voltage Reference

AMP03

E0 = E1 + E2

E1

E2

Figure 25. Precision Summing Amplifier

R1

R2

AMP03

E1

E0 = (R2 /R1+1)

E1 = E2

2

E2

Figure 26. Precision Summing Amplifier with Gain

–6–

REV. E

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