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LT 2178/LT 2179

17

µA Max, Dual and Quad,

Single Supply, Precision Op Amps

FEATURES

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SO Package with Standard Pinout

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Supply Current per Amplifier: 17

µA Max

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Offset Voltage: 70

µV Max

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Offset Current: 250pA Max

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Input Bias Current: 5nA Max

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Voltage Noise: 0.9

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Offset Voltage Drift: 0.5

µV/°C

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Gain Bandwidth Product: 85kHz

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Slew Rate: 0.04V/

µs

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Single Supply Operation

Input Voltage Range Includes Ground

Output Swings to Ground while Sinking Current

No Pull-Down Resistors Needed

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Output Sources and Sinks 5mA Load Current

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 opera-

tion at 5V. Specifications are also provided at

±15V supply.

The extremely low supply current is combined with true

precision specifications: offset voltage is 30

µV and offset

current is 50pA. Both offset parameters have low drift

picoampere offset current permit the use the megohm

level source resistors without introducing serious errors.

Voltage noise, at 0.9

the low 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.

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Battery- or Solar-Powered Systems

Portable Instrumentation

Remote Sensor Amplifier

Satellite Circuitry

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Micropower Sample-and-Hold

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Thermocouple Amplifier

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Micropower Filters

, LTC and LT are registered trademarks of Linear Technology Corporation.

Self-Buffered, Dual Output, Micropower Reference

Supply Current vs Temperature

2

3

5

6

1/2 LT2178

1

0.1

µF

250k

1M*

1M*

LT1004-1.2

4

7

2M

0.1

µF

1.2365V

OUTPUT

1/2 LT2178

2.470V

OUTPUT

4V TO 9V

LT2178/79 • TA01

TOTAL BATTERY CURRENT = 28

µA

OUTPUT ACCURACY =

±0.4% MAX

TEMPERATURE COEFFICIENT = 20ppm/

°C

LINE REGULATION = 10ppm/V

* 0.1% FILM RESISTORS

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TEMPERATURE (

°C)

–50

–25

0

25

50

LT2178/79 • TPC02

75

20

18

16

14

12

10

100