This application note describes the applications of LTC®1043. It is a multi-pole switch that can be used in board-level applications. LTC1043 integrates multiple switches and can achieve multi-channel switching. It controls the switches by a non-overlapping clock.
The document introduces the LTC1043, a device that makes CMOS switches available for board-level use to implement sophisticated circuit functions. It features multi-pole switching, a self-driven non-overlapping clock, and charge balancing circuitry to minimize errors associated with stray capacitance.
Three specific applications are detailed: a precision instrumentation amplifier using the LTC1043 and an LT1013 dual op amp; an ultrahigh performance chopper-stabilized instrumentation amplifier achieving 0.1μV/°C drift; and a lock-in amplifier capable of extracting signals buried in noise. Additionally, a wide range digitally controlled variable gain amplifier is described.
Placing a 0.01μF capacitor from Pin 16 to ground sets the switching frequency at 500Hz.
The described variable gain amplifier features continuously variable gain from 0 to 1000.
This approach achieves a low drift of 0.1μV/°C.