LT1494 Datasheet

• Low Supply Current: 1.5µA Max
• Rail-to-Rail Input and Output
• Low Offset Voltage: 375µV Max
• Wide Supply Range: 2.2V to 36V
• Single Supply Input Range: –0.3V to 36V
• Low Input Bias Current: 250pA
• Low Input Offset Current: 20pA
• High A_VOL: 100V/mV Minimum Driving 100kΩ Load
• Output Sources and Sinks 500µA Load Current
• Reverse Battery Protected to 18V
• Operating Temperature Range: –40°C to 125°C (LT1494)
• Over-The-Top^™ Inputs Operate Above V⁺

• Battery- or Solar-Powered Systems
• Portable Instrumentation
• Remote Sensor Amplifier
• Micropower Filter

The LT1494 are the lowest power (I_S ≤­ 1.5µA) op amps with precision specifications. The extremely low supply current is combined with excellent amplifier specifications: input offset voltage is 375µV maximum with a typical drift of only 0.4µV/°C, input offset current is 100pA maximum. A minimum open-loop gain (A_VOL) of 100V/mV ensures that gain errors are small. The device characteristics change little over the supply range of 2.2V to ±15V. Supply rejection is 90dB and the common mode rejection ratio is 90dB. Operation is specified for 3V, 5V and ±15V supplies. Reverse battery protection (–18V min) and inputs that operate above the positive supply make the LT1494 easy to use in harsh environments.

The low bias currents and offset current of the amplifier permit the use of megohm level source resistors without introducing significant errors. Voltage noise at 4µV_P-P is remarkably low considering the low supply current.

The LT1494 is available in the 8-Pin MSOP, PDIP and SO packages.