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Resistor networks target signal conditioning apps

Posted: 16 May 2011     Print Version  Bookmark and Share

Keywords:resistor network  CMRR matching  signal conditioning apps 

Linear Technology Corp. has introduced the LT5400, its first family of precision matched resistors designed for high-performance signal conditioning applications in difference amplifiers, precision dividers, references and bridge circuits. The company has enhanced LT5400 with "matching for CMRR," a new metric that guarantees common-mode rejection ratio (CMRR) performance when configured in a difference amplifier circuit. The LT5400 matching for CMRR is 0.005%, a 2x improvement over independent resistors with 0.01% matching.

Three resistor network options are in full production with resistor ratios of 1:1 and 10:1 quad 10K resistors, quad 100K resistors and dual 10K/dual 100K resistors. Each LT5400 has guaranteed matching of 0.01% from -40–85°C, and 0.0125% from -40–125°C.

As a replacement for discrete resistors, the small LT5400 MSOP package minimises thermal gradients, and ensures consistent conditions over time and temperature for all four resistors. Since the LT5400 is based on conventional silicon fabrication and assembly, it is relatively insensitive to shock, vibration, humidity and temperature extremes. A high temperature option is available that is fully specified from -55–150°C. The LT5400 is targeted for instrumentation and test equipment in heavy industrial, military and automotive environments. Standard production processes ensure LT5400 availability with consistently short lead times.

Samples and production quantities of the LT5400 are now available and prices start at Rs.155.80 ($3.49) each in 1,000-piece quantities. Additional options with different resistor values will be available soon.

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