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LT1078/LT1079

Micropower, Dual and

Quad, Single Supply, Precision Op Amps

FEATURES

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Available in 8-Pin SO Package

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50

µA Max Supply Current per Amplifier

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70

µV Max Offset Voltage

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180

µA Max Offset Voltage in 8-Pin SO

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250pA Max Offset Current

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0.6

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0.4

µV/°C Offset Voltage Drift

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200kHz Gain Bandwidth Product

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0.07V/

µs Slew Rate

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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

packages including the small outline surface mount pack-

age. The LT1079 is a micropower quad op amp offered in

the standard 14-pin packages. Both devices are optimized

for single supply operation at 5V.

±15V specifications are

also provided.

Micropower performance of competing devices is achieved

at the expense of seriously degrading precision, noise,

speed and output drive specifications. The design effort of

the LT1078/LT1079 was concentrated on reducing sup-

ply current without sacrificing other parameters. The

offset voltage achieved is the lowest on any dual or quad

nonchopper stabilized op amp—micropower or other-

wise. Offset current, voltage and current noise, slew rate

and gain bandwidth product are all two to ten times better

than on previous micropower op amps.

The 1/f corner of the voltage noise spectrum is at 0.7Hz,

at least three times lower than on any monolithic op amp.

This results in low frequency (0.1Hz to 10Hz) noise

performance which can only be found on devices with an

order of magnitude higher supply current.

Both the LT1078 and LT1079 can be operated from a

single supply (as low as one lithium cell or two Ni-Cad

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.

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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

Distribution of Input Offset Voltage

(LT1078 and LT1079 in H, J, N Packages)

INPUT OFFSET VOLTAGE (

µV)

–120

0

80

1078/79 • TA02

–80

–40

40

16

14

12

10

8

6

4

2

0

120

Single Battery, Micropower, Gain = 100, Instrumentation Amplifier

INVERTING

INPUT

1M

2

3

1

6

5

7

A

1/2 LT1078

10.1k

1M

10.1k

NONINVERTING

INPUT

B

1/2 LT1078

4

8

3V (LITHIUM CELL)

OUT

TYPICAL PERFORMANCE

INPUT OFFSET VOLTAGE = 40

µV

INPUT OFFSET CURRENT = 0.2nA

TOTAL POWER DISSIPATION = 240

µW

COMMON MODE REJECTION = 110dB (AMPLIFIER LIMITED)

GAIN BANDWIDTH PRODUCT = 200kHz

OUTPUT NOISE = 85

= 300

INPUT RANGE = 0.03V TO 1.8V

OUTPUT RANGE= 0.03V TO 2.3V

(0.3mV

OUTPUTS SINK CURRENT—NO PULL-DOWN RESISTORS

ARE NEEDED

LT1078/79 • TA01

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