13

LT 2078/LT 2079

+

–

9

10

8

1/4 LT2079

–

+

+

–

–

+

R2

1M

R2

1M

1/4 LT2079

1/4 LT2079

1/4 LT2079

3

2

1

R1

1M

R1

1M

200k

6

5

7

12

13

14

R3

9.1M

R3

9.1M

9V

4

11

2R

20M

OUTPUT

4mV TO 8.2V

R

10M

2R

20M

–IN

+IN

GAIN = 1 +

()

2R1

R3

R2

= 100 FOR VALUES SHOWN

LT2078/79 • TA05

INPUT BIAS CURRENT TYPICALLY < 150pA

INPUT RESISTANCE = 3R = 30M FOR VALUES SHOWN

GAIN BANDWIDTH PRODUCT = 1.8MHz

Picoampere Input Current, Triple Op Amp

Instrumentation Amplifier with Bias Current Cancellation

85V, –100V Common Mode Range

+

–

+

–

6

5

7

1/2 LT2078

100k

100k

1/2 LT2078

2

3

1

OUTPUT

8V TO –9V

LT2078/79 • TA06

BANDWIDTH=2kHz

OUTPUT OFFSET=8mV

(DOMINATED BY RESISTOR NOISE)

9V

–9V

8

4

1M

10M

1M

10M

10M

+IN

–IN

INPUT RESISTANCE =10M

Absolute Value Circuit (Full-Wave Rectifier)

+

–

–

+

5

6

7

1/2 LT2078

1/2 LT2078

2

3

1

OUTPUT

LT2078/79 • TA08

NO DISTORTION TO 100Hz

5V

8

4

200k

200k

INPUT

1N4148

3.5V

–3.5V

0V

3.5V

Half-Wave Rectifier

+

–

1/2 LT2078

OUTPUT

LT2078/79 • TA07

NO DISTORTION TO 100Hz

3V

2M

2M

1M

INPUT

1.8V

–1.8V

1.8V

0V

Programmable Gain Amplifier (Single Supply)

13

12

14

OUT

+

–

1/4 LT2079

9

10

+

–

1/4 LT2079

6

5

+

–

1/4 LT2079

2

3

88

3

1

2

7

4

9

A

C

B

+

–

1/4 LT2079

7

CD4016B

13

5

6

11

4

11

1

3V TO 18V

3V TO 18V

1M

100k

10k

1.11k

IN

LT2078/79 • TA09

ERROR DUE TO SWITCH ON RESISTANCE,

LEAKAGE CURRENT, NOISE AND TRANSIENTS

ARE ELIMINATED

CD4016B

GAIN PIN 13

PIN 5

PIN 6

1000

HIGH

LOW

LOW

100

LOW

HIGH

LOW

10

LOW

LOW

HIGH