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Linear Tech amplifiers with on-board precision resistors

Posted: 01 Nov 2004 ?? ?Print Version ?Bookmark and Share

Keywords:linear technology? lt1991? lt1995? amplifier?

Linear Technology Corp. disclosed that they have developed the LT1991 precision and LT1995 high-speed gain selectable amplifiers as a response to today's demands for flexible design solutions to support a wide variety of applications.

Unlike traditional amplifier solutions that require external resistors to set the gain, the new family of amplifiers includes precision resistors on-board. The result is a one-chip solution that can be easily configured into various gain circuits by simply pin-strapping the device, the company said. 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, added Linear Tech.

The LT1991 combines a precision micropower operational amplifier with eight precision resistors to form a single chip solution for accurately amplifying voltages with better than 0.04 percent gain accuracy. The press release said that the amplifier has excellent DC characteristics with input offset voltage of <50?V and input offset current of 50pA. The low offset voltage drift of 1?V/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 <110?A on a single 5V supply, making it suitable for low voltage, low power instrumentation applications.

"The magic of the LT1991 and LT1995 is in the on-board thin film resistors," design manager Bill Jett commented. "The matching accuracy and tempcos mean both closed loop gain and CMRR will be solid over time and temperature."

The LT1995 integrates a high-speed amplifier with eight precision resistors in a tiny MSOP-10 package. This device features superb slewing characteristics, 1,000V/?s, and fast settling time, 100ns to 0.1 percent, resulting in excellent AC characteristics, boasted the company. The LT1995 operates on supply voltages from 2.5V to 15V.

Offered in the 10-lead MSOP package, both amplifiers are specified for operation over the commercial and industrial temperature ranges. For 1,000-piece orders, pricing starts at $1.39 each for the LT1991 and $1.89 each for the LT1995.

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