LT1882IS
LT1882IS - Quad Picoamp Input Precision Op Amp | ADI
Analog Devices LT1882IS is a four-circuit, rail-to-rail output precision operational amplifier with picoamp-class input bias current, a 1 MHz gain-bandwidth product, and a 0.4 V/µs slew rate. The device is packaged in a 14-pin SOIC and operates from single 2.7 V to 36 V supplies or dual ±18 V supplies. Its input offset voltage is trimmed below 50 µV, making it suitable for precision signal-conditioning systems that need low bias current, low offset, and rail-to-rail output swing.
An operational amplifier, or op amp, is a high-gain analog building block used to amplify, buffer, filter, and compare small voltage signals. The LT1882 belongs to the precision operational amplifier category, which sits within analog ICs and broader semiconductor signal-conditioning systems. Its rail-to-rail output stage allows the output to approach the supply limits, while the picoamp input bias current reduces measurement errors when driving high-impedance sensors, photodiodes, and high-impedance feedback networks.
Key features include four amplifiers in one package, a 1 MHz gain-bandwidth product, a 0.4 V/µs slew rate, input offset voltage trimmed to less than 50 µV, rail-to-rail output operation, and picoamp input bias current. These characteristics make the LT1882 particularly useful when a design requires precision DC behavior but does not need the higher speed of the LT1884 or LT1885. The manufacturer identifies thermocouple amplifiers, bridge-transducer conditioners, instrumentation amplifiers, battery-powered systems, and photodiode current amplifiers as representative applications.
The LT1882 combines precision input characteristics with conservative speed and drive capability. Its lower bandwidth than the LT1884/LT1885 is intentional: reduced speed improves input-noise behavior, bias-current performance, and capacitive-load drive in exchange for slower slew and less bandwidth. Because all four channels share one package, designers can implement several gain stages, buffers, or active filters while controlling board area. Independent amplifiers can also be used for instrumentation front ends, although system-level offset and drift still require calibration when very high absolute accuracy is needed.
Typical uses include thermocouple and low-level sensor conditioning, strain-gauge bridge signal amplification, precision current-to-voltage conversion for photodiodes, low-power instrumentation, and buffered sensor interfaces. In battery-powered equipment, the low input bias current can reduce demand on high-value precision resistors and sensitive transducers. The rail-to-rail output also improves usable signal swing in low-voltage systems, although headroom, output-current limits, and capacitive loading must be checked in the final operating condition.
For PCB implementation, place each input and feedback component close to its associated amplifier pins, keep sensitive input traces short, and provide solid ground-plane continuity. Bypass the supply pins locally with the manufacturer-recommended ceramic capacitance. Avoid placing long parallel routes beneath sensitive amplifier inputs, because capacitive pickup can increase output noise or disturb bias-current measurements. Confirm output stability with the external load capacitance and feedback network used in the final circuit.
This product page combines the manufacturer application positioning, package and performance characteristics, orderable-package details, and a focused replacement analysis. It also adds practical guidance for precision sensor interfaces, bridge conditioners, photodiode amplifiers, battery-powered systems, and instrumentation while clearly separating the LT1882 from higher-speed family members.
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