LT1672

Obsolete

2uA Max, Av ≥ 5 Single Over-The-Top Precision Rail-to-Rail Input and Output Op Amps

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Overview

Gain of 5 Stable
Low Supply Current: 2µA Max per Amplifier
Rail-to-Rail Input and Output
Low Offset Voltage: 375µV Max
Over-The-Top^™ Inputs Operate Above V⁺
Gain Bandwidth Product: 12kHz
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

The LT1672/LT1673/LT1674 are ultralow power (I_S ≤ 2µA) decompensated (A_V ≥ 5) op amps with precision specifications. The extremely low supply current is combineed with excellent amplifier specifications: input offset voltage is 375µV maximum with atypicaal 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 devices' 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 LT1672/LT1673/LT1674 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. For unity gain stable versions of these amplifiers, see the LT1494/LT1495/LT1496.

The LT1672 is available in the 8-pin MSOP, PDIP and SO packages. The LT1673 is available in plastic 8-pin PDIP and SO-8 packages with the standard dual op amp pinout. The LT1674 is available in 14-pin PDIP and SO packages.

Applications

Battery- or Solar-Powered Systems
Portable Instrumentation
Remote Sensor Amplifier
Micropower Filter
Photodiode Amplifier
High Impedance Circuits

Documentation

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LT1672

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.