For design single channel 3wire RTD simply we can use sigma delta ADCs like as ad7792 but for 4 channel 3 wire RTD design we need 8 current sources,
Is there a way to use one multichannel sigma delta for design 4ch 3wire-RTD signal converter?
The AD7792 3-wire compensation scheme looks quite nice at first sight. Reviewing the current source performance specification (e.g. 200 ppm TC) already chills the enthusiasm.
But appart from this specific problem, either if you use single or dual current source for your Pt100 circuit, why not feed them through spearate muxes to multiple sensors in a multichannel configuration?
I don't exactly understand what you mean with Iref and Vref? Referring to the AD7792 input circuit, you would multiplex two current source outputs and two voltage sense inputs.
Hi, i am experiencing somewhat same issue but i want to multiplex 32 RTDs, for which i am using 32 channel multiplexer ADG732, but for the purpose of multiplexing excitation current into the RTDs i want to excite each RTD at a time, can u suggest me that is it possible for ADG732 to demultiplex 1mA from my current source to 32 channels?