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LT 2078/LT 2079

Micropower, 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: 50

µA Max

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Offset Voltage: 70

µV Max

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Offset Current: 250pA Max

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Voltage Noise: 0.6

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Offset Voltage Drift: 0.4

µV/°C

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Gain Bandwidth Product: 200kHz

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Slew Rate: 0.07V/

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

outline, standard surface mount package, and LT2079 is

a micropower quad op amp offered in the standard 14-pin

surface mount package. 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 LT2078/LT2079 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.

Both the LT2078/LT2079 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 resis-

tors are needed. For applications requiring DIP packages

refer to the LT1078/LT1079.

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

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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

Single Battery, Micropower, Gain = 100, Instrumentation Amplifier

Distribution of Input Offset Voltage

INPUT OFFSET VOLTAGE (

µV)

–120

0

80

2078/79 • TA02

–80

–40

40

800

700

600

500

400

300

200

100

0

120

5000 OP AMPS

INVERTING

–INPUT

1M

2

3

1

6

5

7

A

1/2 LT2078

10.1k

1M

10.1k

NONINVERTING

+INPUT

B

1/2 LT2078

4

8

3V

(Li-Ion)

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

LT2078/79 • TA01