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LT1079 - Micropower, Dual and Quad, Single Supply, Precision Op Amps

The LT®1078 is a micropower dual op amp in 8-pin packages including the small outline surface mount package. 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 supply current without sacrificing other parameters. The offset voltage achieved is the lowest on any dual or quad nonchopper stabilized op amp—micropower or otherwise. 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.

Features Available in 8-Pin SO Package 50µA Max Supply Current per Amplifier 70µV Max Offset Voltage 180µA Max Offset Voltage in 8-Pin SO 250pA Max Offset Current 0.6µVP-P, 0.1Hz to 10Hz Voltage Noise 3pAP-P, 0.1Hz to 10Hz Current Noise 0.4µV/°C Offset Voltage Drift 200kHz Gain Bandwidth Product 0.07V/µs Slew Rate Single Supply OperationInput Voltage Range Includes GroundOutput Swings to Ground while Sinking CurrentNo Pull-Down Output Sources and Sinks 5mA Load Current Typical Application

Applications Battery or Solar-Powered SystemsPortable InstrumentationRemote Sensor AmplifierSatellite Circuitry Micropower Sample-and-Hold Thermocouple Amplifier Micropower Filters Packaging