Question1: Do the input current of AD7091 Vin0 ... Vin7 ,and REF IN /REF OUT and ADC IN pin need to be constrained blow a vlue ? or will the chip be destoried?
Question2: What is the function of ADC IN pin and MUX OUT pin ? Via the information in the datasheet ,I can not learn that clearly
1. The absolute maximum on input current to any pin except supplies is +/-10mA(Please see page 7 of the AD7091R-8 data sheet)
2. Please see page 8 of the data sheet for description of the functions of the ADCIN and MUXOUT pins
Thanks for your answer,
And for the 2nd question,I have read the information of Page8,but I am still not very clear .
1. For ADCIN ,it is just used to connect MUX OUT to keep the stability of the sample voltage value for the successive ADC ？
2. For MUXOUT , I think it is a Multiplexer , and the output of the Multiplexer is a analogy value ,right ? it is impossibly a digital value ,right? But if it is a analogy value, can the MUXOUT be controlled to output different Vin via a register ?
The function of MUXOUT is used to sample the different Vin analogy voltage value via a meter such as a Voltage meter or a oscilloscope ? and then I can compare the sample value with the output of the ADC to meter the difference ,and can give a extra value to adjust output of the ADC?
The output of MUXOUT pin is analog. Please see page 22 for 2 ways you can connect ADCIN and MUXOUT pins. The MUXOUT and ADCIN pins allow signal conditioning of the multiplexer output prior to acquisition by the ADC.