Unity-gain difference amplifier integrates precision matched resistor

Linear Technology's LT6375 unity-gain difference amplifier is now available from Digi-Key stock. The device combines exceptional DC precision, a very high input common mode range, and a wide supply voltage range. The LT6375 is a unity-gain difference amplifier with integrated precision matched resistor, which precisely levels shifts and buffers small difference signals, while rejecting up to ±270 V common mode. The A-grade version achieves CMRR of 97 dB (minimum), initial gain error of 35 ppm (maximum), gain drift of 1 ppm/C (maximum), and gain nonlinearity of 2ppm (maximum) with a common-mode divide ratio of 25:1. The common-mode divide ratio is selectable from 7:1 to 25:1, enabling the designer to select the ratio with the best performance for a given common mode input range. At the heart of the LT6375 is a high-precision over-the-top amplifier which operates with inputs both within and above the 3.3 V to 50 V supply voltage. This permits the combination of a wide input range and low-voltage supply. Use of a low-voltage supply limits power consumption and protects downstream circuitry from high voltage. It offers seven different divider ratios for optimization of precision, noise, and speed for specific input range requirements. The LT6375 includes many other useful features, including rail-to-rail outputs, low supply current, and a shutdown mode. It is available in a 4mm x 4mm DFN and a 4mm long MSOP package, both with 12 leads. including skipped leads for extra spacing of high voltage input signals. The LT6375 is fully specified over the -40C to 85C (I-grade) and -40C to 125C (H-grade) temperature ranges.