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LTC1051/LTC1053

10513fa

–

1/2

LTC1051

1/2

LTC1051

OUT

–

1051/53 AC01a

eOUT(DC – 1Hz)**

eOUT(DC – 10Hz)**

LT1007

340k

10k

100k

0.01µF

0.001µF

0.1µVP-P

0.15µVP-P

LT1012*

750Ω

57Ω

250k

10k

100k

0.01µF

0.001µF

0.3µVP-P

0.4µVP-P

Obtaining Ultralow VOS Drift and Low Noise

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

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.

VS = ±5V

DC TO 10Hz

NOISE

1 SEC/DIV

1051/53 AC01b

DC TO 1Hz

NOISE

LTC1051/LT1007 Peak-to-Peak Noise

TYPICAL APPLICATIO S

* 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.

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