INA110SG
INA110SG - Fast-Settling FET-Input Amplifier | Texas Instruments
Texas Instruments INA110SG is a single-channel, monolithic FET-input instrumentation amplifier with a current-feedback topology, laser-trimmed input stage, internal gain-set resistors, and a 16-CDIP package. It supports gains of 1, 10, 100, 200, and 500 V/V, reaches 0.01% settling in 4 microseconds, and provides a typical bandwidth of 2.5 MHz. Maximum input bias current is 50 pA, while common-mode rejection reaches at least 106 dB at 10 kHz.
An instrumentation amplifier is a specialized analog amplifier designed to amplify small differential signals while rejecting large common-mode voltages. Its internal architecture provides matched input devices, high input impedance, and stable gain behavior, making it part of the broader operational-amplifier and signal-conditioning hierarchy. INA110 applications include sensor-interface circuits, bridge amplifiers, current measurement, laboratory instrumentation, and multiplexed data-acquisition systems where low bias current, high common-mode rejection, and rapid settling are important.
Internal gain resistors permit selectable gains of 1, 10, 100, 200, and 500 V/V without external feedback resistors. The laser-trimmed input stage supports high accuracy, with very low gain drift of up to 50 ppm per degree Celsius and input offset drift of 2 microvolts per degree Celsius. The low maximum bias current of 50 pA is particularly useful with high-impedance sources and electrostatic sensors. A minimum common-mode rejection of 106 dB at 10 kHz improves rejection of interference shared by both input terminals.
The INA110 uses a current-feedback architecture rather than a conventional voltage-feedback topology. This architecture supports fast settling and broad usable bandwidth, while the 2.5 MHz typical bandwidth provides useful signal bandwidth for precision measurement systems. The manufacturer identifies fast settling as especially valuable in high-speed and multiplexed-input data-acquisition systems, where insufficient settling between channel selections can create measurement errors. The INA110SG operates from dual supplies with a typical total supply of plus or minus 15 V, a minimum of plus or minus 6 V, and a maximum of plus or minus 18 V.
Typical applications include low-current sensor amplification, precision bridge excitation and readout, isolated or high-impedance measurement front ends, portable instrumentation, and multi-channel acquisition systems. The low bias current helps preserve sensor accuracy, while the 106 dB common-mode rejection helps suppress noise and power-supply-related disturbances appearing equally on both inputs. The 4-microsecond settling specification is valuable when many input channels must be sampled rapidly.
Designers should verify supply polarity, common-mode range, gain selection, input protection, and output swing against the manufacturer datasheet before finalizing the analog path. Instrumentation-amplifier layouts should use short input traces, guard techniques for high-impedance nodes, and symmetric routing to minimize parasitic imbalance. Decoupling capacitors should be placed close to the supply pins, while unused gain-select pins must be connected according to the recommended configuration for the intended gain.
This product overview combines the INA110SG architecture, verified performance characteristics, application guidance, package constraints, and drop-in alternatives into an engineering-focused reference. It also highlights the trade-offs involved when replacing a military-temperature ceramic CDIP with a lower-temperature plastic or ceramic DIP implementation.
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