LT2078AIS8#TRPBF Datasheet LT2079ACS#PBF, LT2078CS8#PBF, LT2078IS8#PBF | P13-P15

13

LT2078/LT2079

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TYPICAL APPLICATIONS

U

+

–

9

10

8

1/4 LT2079

–

+

–

+

R2

1M

R2

1M

1/4 LT2079

3

2

1

R1

1M

R1

1M

R

G

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

R

G

R3

R2

= 100 FOR VALUES SHOWN

LT2078/79 • TA05

INPUT BIAS CURRENT TYPICALLY < 150pA

INPUT RESISTANCE = 3R = 30M FOR VALUES SHOWN

NEGATIVE COMMON MODE LIMIT = (I

B

)(2R) + 20mV ≈ 140mV

GAIN BANDWIDTH PRODUCT = 1.8MHz

Picoampere Input Current, Triple Op Amp

Instrumentation Amplifier with Bias Current Cancellation

85V, –100V Common Mode Range

Instrumentation Amplifier (A

V

= 10)

+

–

+

–

6

5

7

1/2 LT2078

100k

1/2 LT2078

2

3

1

OUTPUT

8V TO –9V

LT2078/79 • TA06

BANDWIDTH= 2kHz

OUTPUT OFFSET= 8mV

OUTPUT NOISE= 0.8mV

P-P

(0.1Hz TO 10Hz)

= 1.4mV

RMS

OVER FULL BANDWIDTH

(DOMINATED BY RESISTOR NOISE)

9V

–9V

8

4

1M

10M

1M

10M

+IN

–IN

INPUT RESISTANCE = 10M

Absolute Value Circuit (Full-Wave Rectifier)

+

–

+

5

6

7

1/2 LT2078

2

3

1

OUTPUT

LT2078/79 • TA08

V

OMIN

= 4mV

NO DISTORTION TO 100Hz

5V

8

4

200k

INPUT

1N4148

3.5V

–3.5V

0V

3.5V

Half-Wave Rectifier

+

–

1/2 LT2078

OUTPUT

LT2078/79 • TA07

V

OMIN

= 6mV

NO DISTORTION TO 100Hz

3V

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

1M100k10k1.11k

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

14

LT2078/LT2079

20789fa

TYPICAL APPLICATIONS

U

Single Supply, Micropower, Second Order Lowpass Filter with 60Hz Notch

–

+

–

6

5

7

1/2 LT2078

2.64M

0.1%

2.64M

0.1%

1/2 LT2078

3

2

1

OUTPUT

TYPICAL OFFSET

≈ 600µV

LT2078/79 • TA10

5V

8

4

1.35M

0.1%

IN

2000pF

0.5%

1000pF

0.5%

1000pF

0.5%

0.02µF

5.1M

1%

120k

5%

100pF

0.01µF

27.6k

0.1%

27.6k

0.1%

f

C

= 40Hz

Q = 30

Micropower Multiplier/Divider

–

+

6

5

13

12

1/4 LT2079

4

11

714

–

+

2

3

1/4 LT2079

1

–

+

9

10

1/4 LT2079

8

–1.5V TO –9V

9V

505k

0.1%

505k

0.1%

505k

0.1%

220pF 220pF

30k

5%

30k

5%

Q1

–

+

220pF

30k

5%

Y INPUT

(5mV TO 50V)

X INPUT

(5mV TO 50V)

Q2 Q4

499k

0.5%

10k

GAIN

Z INPUT

(5mV TO 50V)

OUTPUT

(5mV TO 8V)

1/4 LT2079

Q1,Q2, Q3, Q4 = MAT-04

TYPICAL LINEARITY = 0.01% OF FULL-SCALE OUTPUT

Q3

OUTPUT = , POSITIVE INPUTS ONLY

(X)(Y)

(Z)

NEGATIVE SUPPLY CURRENT = 165µA +

X + Y+ Z + OUT

500k

POSITIVE SUPPLY CURRENT = 165µA +

BANDWIDTH (< 3V

P-P

SIGNAL): X AND Y INPUTS = 10kHz

Z INPUT = 4kHz

OUT

500k

lt2078/79 • TA11

Micropower Dead Zone Generator

–

+

2

3

1

1/4 LT2079

510k

1M**

1M*

Q1

2N4393

–

+

6

5

7

1/4 LT2079

–

+

9

10

8

1/4 LT2079

–

+

13

12

14

1/4 LT2079

1M**

Q4

Q2 Q3

470k

1M*

GAIN

200k

510k

1M**

510k

4

11

9V

1M

1M 680k

1M

1N914

Q5

–9V

Q6

2N4393

1000pF

V

SET

DEAD ZONE

CONTROL INPUT

0.4V TO 5V

V

OUT

LT2078/79 • TA12

BIPOLAR SYMMETRY IS EXCELLENT

BECAUSE ONE DEVICE, Q2,

SETS BOTH LIMITS

SUPPLY CURRENT ≈ 240µA

BANDWIDTH = 150kHz

INPUT

*

**

1% FILM

RATIO MATCH 0.05%

Q2, Q3, Q4, Q5 CA3096 TRANSISTOR ARRAY

V

SET

V

SET

V

OUT

V

IN

15

LT2078/LT2079

20789fa

S8 Package

8-Lead Plastic Small Outline (Narrow .150 Inch)

(Reference LTC DWG # 05-08-1610)

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

TYPICAL APPLICATIONS

U

Lead-Acid Low-Battery Detector with System Shutdown

–

+

–

+

2

3

1

6

5

7

8

4

1/2 LT2078

2M

1%

2M

1%

255k

1%

280k

1%

910k

5%

LT1004-1.2

LO = BATTERY LOW

(IF V

S

< 10.90V)

LO = SYSTEM SHUTDOWN

(IF V

S

< 10.05V)

BATTERY

OUTPUT

LT2078/79 • TA13

TOTAL SUPPLY CURRENT = 105µA

12V

PACKAGE DESCRIPTION

U

.016 – .050

(0.406 – 1.270)

.010 – .020

(0.254 – 0.508)

× 45°

0°– 8° TYP

.008 – .010

(0.203 – 0.254)

SO8 0303

.053 – .069

(1.346 – 1.752)

.014 – .019

(0.355 – 0.483)

TYP

.004 – .010

(0.101 – 0.254)

.050

(1.270)

BSC

1

2

3

4

.150 – .157

(3.810 – 3.988)

NOTE 3

8

7

6

5

.189 – .197

(4.801 – 5.004)

NOTE 3

.228 – .244

(5.791 – 6.197)

.245

MIN

.160 ±.005

RECOMMENDED SOLDER PAD LAYOUT

.045 ±.005

.050 BSC

.030 ±.005

TYP

INCHES

(MILLIMETERS)

NOTE:

1. DIMENSIONS IN

2. DRAWING NOT TO SCALE

3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.

MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)

LT2078AIS8#TRPBF

LT2078AIS8#TRPBF

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