The LT1991 precision and LT1995 high-speed gain selectable amplifiers are unlike traditional amplifier solutions in that they don’t require external resistors to set the gain because precision resistors are included in the chip. The result is a one-chip solution that can be easily configured into various gain circuits by simply pin-strapping the device. You can configure the LT1991 and LT1995 as difference, summing, and inverting or noninverting amplifiers with various gain options without using any external components.

The LT1991 combines a precision micropower op-amp with eight precision resistors to form a single chip solution for accurately amplifying voltages with better than 0.04% gain accuracy. The amplifier has excellent DC characteristics with input offset voltage of less than 50 µV and input offset current of 50 pA. The low offset voltage drift of 1 µV/°C, combined with gain drift below 3 ppm/°C, results in stable operation over temperature. The LT1991 has a rail-to-rail output and operates on supplies from 2.7 to 36 V. It draws less than 110 µA on a single 5-V supply, making it suitable for low-voltage, low-power instrumentation applications.

The LT1995 integrates a high-speed amplifier with eight precision resistors in a tiny MSOP-10 package. The amplifier features superb slewing characteristics, 1,000 V/µs, and fast settling time, 100 ns to 0.1%, resulting in excellent AC characteristics. The LT1995 operates on supply voltages from ±2.5 to ±15 V. It makes an excellent choice for applications such as data acquisition cards in industrial and process control, ATE cards, current tester boards, satellite receiver cards, communications and optical networking equipment, semiconductor fab equipment, and medical imaging systems.  

Offered in the 10-lead MSOP package, the LT1991 and LT1995 are specified for operation over the commercial and industrial temperature ranges. One thousand-piece pricing starts at $1.39 each for the LT1991 precision amplifier and $1.89 each for the LT1995 high-speed amplifier.

Linear Technology Corp.
www.linear.com