New Industry Products

LTC Debuts New LT1990 Difference Amplifier

October 03, 2004 by Jeff Shepard

Linear Technology Corp. (LTC, Milpitas, CA) announced its new LT1990, a micropower, gain-selectable, difference amplifier that has an input that can extend to ±250 V while operating on ±15 V supplies. The device is well suited for applications where small signals need to be extracted from high-voltage circuits, as is the case in many current-monitoring applications. In addition, the LT1990's inputs are fault-protected to handle voltage transients as high as ±350 V.

The LT1990 is suitable for high-side and low-side current or voltage monitoring, use in automotive diagnostic equipment and electro-mechanical systems, battery cell voltage monitoring and power supply current monitoring in portable instrumentation, and industrial applications that measure small differential voltages in the presence of high electrical noise. The LT1990's wide common-mode range, 85 V window on a single 5 V supply, also makes it suitable for -77 V to 8 V downward signaling in telecommunications applications.

The LT1990 draws less than 120 µA and is specified for single 3 V, 5 V and ±15 V supplies over both commercial and industrial temperature ranges. Offered in the eight-lead SOIC package, pricing starts at $1.35 each for 1,000-piece quantities.