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Gain Selectable Amplifiers

Thu, 12/23/2004 - 7:57am

Linear Technology introduces the LT1991 and LT1995 high-speed gain selectable amplifiers. This amplifier family includes precision resistors on-board. The result is a one-chip solution that can be configured into various gain circuits by pin-strapping the device. Users can configure the LT1991 and LT1995 as difference, summing, inverting, or non-inverting amplifiers with various gain options without using any external components. These amplifiers allow designers to reduce the BOM and to use a single chip to perform multiple amplifier tasks. The LT1991 combines a micropower operational amplifier with eight resistors to form a single chip solution for amplifying voltages with better than 0.04% gain accuracy. The amplifier has good DC characteristics with input offset voltage of less than 50 uV and input offset current of 50 pA. The low offset voltage drift of 1uV/° C, combined with gain drift below 3ppm/° C, results in stable operation over temperature. The LT1991 has a rail-to-rail output and operates on supplies from 2.7V to 36V. It draws less than 110uA on a single 5V supply, making it suitable for low voltage, low power instrumentation applications.

Linear Technology Corporation

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