LT1008CN8TR View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LT1008CN8TR

Picoamp Input Current, Microvolt Offset, Low Noise Op Amp

Linear Technology 

LT1008

TYPICAL APPLICATIO S

Precision, Fast Settling, Lowpass Filter

10k

INPUT

1.5M

2k

2–

6

LT1008

3+

8

1μF

1

OUTPUT

1k

15V

*OPTO-MOS SWITCH

TYPE OFM1A

THETA-J CORP

OPTO-MOS*

15V

8

1000pF

2

7

#1

LT311A

3

4

–15V

1

100Ω

FILTER CUT

IN ADJUST

15V

5

8

7

#2

LT311A

4

–15V

1

10k

3

2

1008 TA09

This circuit is useful where fast signal acquisition and high

precision are required, as in electronic scales.

The filter’s time constant is set by the 2k resistor and the

1μF capacitor until comparator 1 switches. The time

constant is then set by the 1.5M resistor and the 1μF

capacitor. Comparator 2 provides a quick reset.

The circuit settles to a final value three times as fast as a

simple 1.5M-1μF filter with almost no DC error.

Fast Precision Inverters

2pF TO 8pF

10k*

10k*

INPUT

10k*

10k 1N4148 ×2

10pF

10k*

INPUT

12

2N4393

×2

15k

1

15V

2–

5

76

LT318A

3+

4

OUTPUT

–15V

1N4148 (4)

300pF

300pF

15V

2–

7

6

LT1008

3+

4

8

10k

1

–15V

30pF

15V

10k

2–

7

6

LT1008

3+

4

8

10k

1

SLEW RATE = 100V/μs

–15V SETTLING (10V STEP) = 5μs TO 0.01%

OFFSET VOLTAGE = 30μV

BIAS CURRENT DC = 30pA

30pF

*1% METAL FILM

15V

1000pF

2–

7

6

LT318A

3+

4

–15V

10k

OUTPUT

FULL POWER BANDWIDTH = 2MHz

SLEW RATE AT 50V/μs

SETTLING (10V STEP) = 12μs TO 0.01%

BIAS CURRENT DC = 30pA

OFFSET DRIFT = 0.3μV/°C

OFFSET VOLTAGE = 30μV

*1% METAL FILM

1008 TA10

1008fb

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