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LTC1051

Dual/Quad Precision Zero-Drift Operational Amplifiers With Internal Capacitors

Linear Technology 

TYPICAL APPLICATIO S

Obtaining Ultralow VOS Drift and Low Noise

B

+

5

+

2

–

1/2

3 LTC1051

1/2

7

1

R4

6 LTC1051

–

+

5V

R5

C1

C2

R1

R2

1

R3

3+

86

A1

OUT

–

2–

A

LTC1051/LTC1053

The dual chopper op amp buffers the inputs of A1 and

corrects its offset voltage and offset voltage drift. With the

R, C values shown, the power-up warm up time is typically

20 seconds. The step response of the composite amplifier

does not present settling tails. The LT1007 should be used

when extremely low noise; VOS and VOS drift are sought

when the input source resistance is low—for instance a

350Ω strain gauge bridge. The LT1012 or equivalent

should be used when low bias current (100pA) is also

OUT required in conjunction with DC to 10Hz low noise and low

VOS and VOS drift. The measured typical input offset

voltages were less than 2µV.

1051/53 AC01a

A1

R1

R2

R3

R4

R5

LT1007

3k

2k

340k 10k 100k

LT1012*

750Ω 57Ω 250k

10k

100k

C1

0.01µF

0.01µF

C2

0.001µF

0.001µF

eOUT(DC – 1Hz)**

0.1µVP-P

0.3µVP-P

eOUT(DC – 10Hz)**

0.15µVP-P

0.4µVP-P

* Interchange connections A and B .

** Noise measured in a 10 sec window. Peak-to-peak noise was also measured for 10 continuous minutes: With the LT1007 op amp the recorded noise was less than 0.2µVP-P for both DC-1Hz

and DC-10Hz.

VS = ±5V

LTC1051/LT1007 Peak-to-Peak Noise

DC TO 1Hz

NOISE

1 SEC/DIV

DC TO 10Hz

NOISE

1051/53 AC01b

10513fa

11

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