AMP03B 查看數據表（PDF） - Analog Devices

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AMP03B

High-Speed 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 1. 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 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

–IN E1

+IN E2

AMP03

R1

R2

25k⍀

25k⍀

R3

25k⍀

R4

25k⍀

E0 = E2 – E1

Figure 2. Precision Difference Amplifier. Rejects

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

AMP03

E1

E0 = –E1

Figure 3. Precision Unity-Gain Inverting Amplifier

+15V

0.1␮F

REF10

AMP03

+10V OUT

–10V OUT

Figure 4. ؎10 V Precision Voltage Reference

+15V

0.1␮F

AMP03

REF10

+5V OUT

–5V OUT

Figure 5. ؎5 V Precision Voltage Reference

AMP03

E0 = E1 + E2

E1

E2

Figure 6. Precision Summing Amplifier

R1

R2

AMP03

E1

E0

=

( R 2 / R 1 + 1)

E1

=

2

E2

E2

Figure 7. Precision Summing Amplifier with Gain

–6–

REV. F

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