LT2178/LT2179

1

21789fc

TYPICAL APPLICATION

DESCRIPTION

17µA Max, Dual and Quad,

Single Supply, Precision Op Amps

The LT

mount standard 8-pin configuration, the LT2179 is a

micropower quad op amp offered in a surface mount

14-pin package. Both devices are optimized for single

supply operation at 5V. Specifications are also provided

at

±15V supply.

The extremely low supply current is combined with true

precision specifications: offset voltage is 30μV and offset

current is 50pA. Both offset parameters have low drift with

offset current permit the use the megohm level source

resistors without introducing serious errors. Voltage

supply current.

The LT2178/LT2179 can be operated from a single supply

(as low as one lithium-cell or two NiCd batteries). The input

range goes below ground. The all-NPN output stage swings

to within a few millivolts of ground while sinking current.

No power consuming pull down resistors are needed.

For surface mount applications where three times higher

supply current is acceptable, the micropower LT1077

single, LT2078 dual and LT2079 quad are recommended.

The LT1077/LT2078/LT2079 have significantly higher

bandwidth, slew rate, lower voltage noise and better output

drive capability. For applications requiring DIP packages

refer to the LT1178/LT1179.

Self-Buffered, Dual Output, Micropower Reference

FEATURES

APPLICATIONS

Input Voltage Range Includes Ground

Output Swings to Ground while Sinking Current

No Pull-Down Resistors Needed

Portable Instrumentation

Remote Sensor Amplifier

Satellite Circuitry

Supply Current vs Temperature

2

3

5

6

1/2 LT2178

1

0.1μF

250k

1M*

1M*

LT1004-1.2

4

7

2M

0.1μF

1.2365V

OUTPUT

1/2 LT2178

2.470V

OUTPUT

4V TO 9V

21789 TA01

TOTAL BATTERY CURRENT = 28mA

OUTPUT ACCURACY = 0.4% MAX

TEMPERATURE COEFFICIENT = 20ppm/°C

LINE REGULATION = 10ppm/V

* 0.1% FILM RESISTORS

8

TEMPERATURE (°C)

–50

–25

0

25

50

21789 TA02

75

20

18

16

14

12

10

100

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