The LT1991 is a low-power, high-precision operational amplifier with adjustable gain that is suitable for use in differential amplifier circuits. The device is available in a 10-lead MSOP and a low profile (0.8mm) 3mm x 3mm DFN package.
The LT1991 combines a precision operational amplifier with eight on‑chip resistors to provide selectable gains from –13 to 14 without external components. It offers a CMRR greater than 75 dB, a gain‑bandwidth product of 560 kHz, and a maximum input offset voltage of 50 µV. The device operates from 2.7 V to 36 V and draws only 100 pA supply current at 5 V.
Typical applications include handheld instrumentation, medical instrumentation, strain‑gauge amplifiers, and single‑ended conversion. The part is offered in space‑saving 10‑lead MSOP and low‑profile 3 mm × 3 mm DFN packages.
| Gain range (difference amplifier) | 1 to 13 |
|---|---|
| Supply voltage range | 2.7 V to 36 V |
| Supply current (5 V) | 100 pA |
| Gain‑bandwidth product | 560 kHz |
| CMRR | >75 dB |
| Output swing | ±40 mV from either rail |
| Package options | 10‑lead MSOP, 3 mm × 3 mm DFN |
The LT1991 provides a gain range of 1 to 13 in the difference‑amplifier configuration.
It draws only 100 pA of supply current when powered from a 5 V supply.
The device is offered in a 10‑lead MSOP package and a low‑profile 3 mm × 3 mm DFN package.