LINEAR TECHNOLOGY - 1 LT1078 LT1079 Data Sheet Manual

LT1078/LT1079

Micropower, Dual and

Quad, Single Supply, Precision Op Amps

FEATURES DESCRIPTIO ®1078 is a micropower dual op amp in 8-pin Available in 8-Pin SO Package The LT 50µA Max Supply Current per Amplifier packages including the small outline surface mount pack- 70µV Max Offset Voltage age. The LT1079 is a micropower quad op amp offered in 180µA Max Offset Voltage in 8-Pin SO the standard 14-pin packages. Both devices are optimized 250p A Max Offset Current for single supply operation at 5V. ±15V specifications are 0.6µVP-P, 0.1Hz to 10Hz Voltage Noise also provided.

3p AP-P, 0.1Hz to 10Hz Current Noise

Micropower performance of competing devices is achieved

0.4µV/°C Offset Voltage Drift

at the expense of seriously degrading precision, noise,

200k Hz Gain Bandwidth Product

speed and output drive specifications. The design effort of

0.07V/µs Slew Rate

the LT1078/LT1079 was concentrated on reducing sup-

Single Supply Operation

ply current without sacrificing other parameters. The

Input Voltage Range Includes Ground

offset voltage achieved is the lowest on any dual or quad

Output Swings to Ground while Sinking Current

nonchopper stabilized op amp—micropower or other-

No Pull-Down Resistors Needed

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

Output Sources and Sinks 5m A Load Current

and gain bandwidth product are all two to ten times better than on previous micropower op amps.

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

PE RC EN OF NI TS at least three times lower than on any monolithic op amp.

Battery or Solar-Powered Systems

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

Portable Instrumentation

performance which can only be found on devices with an

Remote Sensor Amplifier

order of magnitude higher supply current.

Satellite Circuitry Micropower Sample-and-Hold Both the LT1078 and LT1079 can be operated from a Thermocouple Amplifier single supply (as low as one lithium cell or two Ni-Cad Micropower Filters 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

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

TYPICAL APPLICATIO Distribution of Input Offset Voltage (LT1078 and LT1079 in H, J, N Packages)

Single Battery, Micropower, Gain = 100, Instrumentation Amplifier

10.1k 1M VS = 5V, 0V

TA = 25°C

1M 3V (LITHIUM CELL)

1/2 LT1078

INVERTING OUT

1/2 LT1078

INPUT

NONINVERTING INPUT LT1078/79 • TA01

TYPICAL PERFORMANCE OUTPUT NOISE = 85µVP-P 0.1Hz TO 10Hz INPUT OFFSET VOLTAGE = 40µV = 300µVRMS OVER FULL BANDWIDTH

INPUT OFFSET CURRENT = 0.2n A INPUT RANGE = 0.03V TO 1.8V TOTAL POWER DISSIPATION = 240µW OUTPUT RANGE = 0.03V TO 2.3V

COMMON MODE REJECTION = 110d B (AMPLIFIER LIMITED) (0.3m V ≤ VIN+ – VIN– ≤ 23m V) –120 –80 –40

GAIN BANDWIDTH PRODUCT = 200k Hz OUTPUTS SINK CURRENT—NO PULL-DOWN RESISTORS

INPUT OFFSET VOLTAGE (µV) 1078/79 • TA02

ARE NEEDED

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