# Forum: Analog Circuits ultra low current high impedance ADC with MUX for 0-5V rail to rail

 Author: Matthias W. (matt007) Posted on: 2018-03-14 19:33

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for a data logger I am searching for an ad converter with low current
consumption, 14 to 16bit, 0-5V range rail to rail, imput mux for 8
inputs or more and high impedance.

There are chips like ADAS3022 - 8ch high impedance, accurate, but
unfortunately current consumption in the 15 and more mA range.

There also is the old 7109 - but not capable up to 5V. Using extra
resistors for dividing is not wanted here. Also OP amps in front are not
so fine because of additional error, space, cost, consumption.

The integrating principle seems to be fine
(Youtube-Video "Integrating or Dual Slope ADC (Analog to Digital Converter)" Integrating or Dual Slope

Unfortunately I do not know a chip going to 5V input without using an
external divider.

Question:
Did somebody build something like that willing to share his knowledge?
Is a chip known like ADAS3022 - but with 0-5V range and much less
current consumption?

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