Multichannel analog-to-digital converter module with variable gain

Abstract

For measurement of some analog signal as voltage, current, resistance etc. and for a different input signal level on multichannel single-ended analog-to-digital converter is necessary to have a variable gain for all input channels. The proposed solution is based on an instrumental operational amplifier on an input stage, where gain level reaches value of 384. An operational amplifier with gain level between 1 and 30 and with offset voltage control is used in the middle stage. Module is ended by 16-bit analog-to-digital converter with a parallel interface compatible with digital signal processors, microcontrollers etc. © 2004 IFAC.