LT1178/LT1179

1

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The LT

8-pin configuration; the LT1179 is a micropower quad op

amp offered in the standard 14-pin packages. Both

devices are optimized for single supply operation at 5V.

Specifications are also provided at ±15V supplies.

The extremely low supply current is combined with true

precision specifications: offset voltage is 30µV, offset

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

temperature. The 1.5pAp-p current noise and picoampere

offset current permit the use of megaohm level source

resistors without introducing serious errors. Voltage noise,

at 0.9µVp-p, is remarkably low considering the low

supply current.

Both the LT1178 and LT1179 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 applications where three times higher supply

current is acceptable, the micropower LT1077 single,

LT1078 dual and LT1079 quad are recommended. The

LT1077/78/79 have significantly higher bandwidth, slew

rate, lower voltage noise and better output drive capability.

■

17µA Max Supply Current per Amplifier

■

70µV Max Offset Voltage

■

250pA Max Offset Current

■

5nA Max Input Bias Current

■

■

■

0.5µV/°C Offset Voltage Drift

■

85kHz Gain-Bandwidth Product

■

0.04V/µs Slew Rate

■

Single Supply Operation:

Input Voltage Range Includes Ground

Output Swings to Ground While Sinking Current

No Pull Down Resistors are Needed

■

Output Sources and Sinks 5mA Load Current

17µA Max, Dual and Quad,

Single Supply, Precision Op Amps

Self-Buffered, Dual Output, Micropower Reference

Supply Current vs Temperature

■

Battery or Solar Powered Systems

Portable Instrumentation

Remote Sensor Amplifier

Satellite Circuitry

■

Micropower Sample-and-Hold

■

Thermocouple Amplifier

■

Micropower Filters

TEMPERATURE (°C)

–50

10

12

14

16

–25

0

25

50

LT1178/LT1179 • TA02

75

18

20

100

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

+

–

–

+

2

2M

1M*

1M*

1

250k*

0.1µF

0.1µF

LT1004-1.2

1/2 LT1178

1/2 LT1178

4

6

5

8

4V TO 9V

1.2365V

OUTPUT

2.470V

OUTPUT

TOTAL BATTERY CURRENT

OUTPUT ACCURACY

TEMPERATURE COEFFICIENT

LOAD REGULATION

LINE REGULATION

*

= 28µA

= ± 0.4% MAX

= 20ppm/°C

= 10ppm/V

= 0.1% FILM RESISTORS

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LT1178/LT1179 • TA01

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