LT1079 Datasheet

• 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
• 0.6µV_P-P, 0.1Hz to 10Hz Voltage Noise
• 3pA_P-P, 0.1Hz to 10Hz Current Noise
• 0.4µV/°C Offset Voltage Drift
• 200kHz Gain Bandwidth Product
• 0.07V/µs Slew Rate
• Single Supply Operation
  • Input Voltage Range Includes Ground
  • Output Swings to Ground while Sinking Current
  • No Pull-Down
• Output Sources and Sinks 5mA Load Current

• Battery or Solar-Powered Systems
  • Portable Instrumentation
  • Remote Sensor Amplifier
  • Satellite Circuitry
• Micropower Sample-and-Hold
• Thermocouple Amplifier
• Micropower Filters

The LT1079 is a micropower quad op amp offered in the standard 14-pin packages. The LT1079 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 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.

The 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.