I am not sure you do, would you suggest using AD1974 or AD176-2 or something different with ADXL001 then? Olov
Have you checked AD73360 based on your requirement?
Normally, the ADC selection depends on the noise performance before the ADC. Suppose you set the BW of ADXL001 to 400Hz and its RMS noise is 85mg (ADXL001-70), the sensitivity of ADXL001-70 is 16mV/g, then convert to voltage, it is 85mg * 0.016mV/mg = 1.36mV. Suppose the reference voltage of ADC is 3.3V, then the ENOB of ADC should can satisfy 1/2^N * 3.3V < 1.36mV, which means ADC ENOB >= 12 bits. Then, you also need to consider sampling rate to make it can satisfy Nyquist Laws. Refer to others, you also need to consider how many channels that you need, what is the power supply, package, price..., There is a selection table on ADI website, you can choose the ADC from it based on these. http://www.analog.com/en/analog-to-digital-converters/ad-converters/products/index.html. Refer to the two parts that you mentioned, AD1974 is desinged for audio system and I did not find the part AD176-2, they may not the good choice for ADXL001. AD7682 could be a start for your reference.
Hi, Thank´s for the input, we are limiting our selection to Sigma-Delta to handle anti-aliasing properly. In the field we work it is not uncommon to use audio versions for various reasons not that I am fond of it. Sorry I gave the wrong number for the other it should be AD7176-2. Yes we would like to have a 3.3V solution but that may not be so easy, We need signal after filter and A/D up to 11-12kHz so we need to sample around or less than 30kHz and a FS of around +-1V for the 70g range that may not really be required either. We will eventually use 3-4 channels but primarily 1ch. Since AD7176-2 is muxed we would maybe like a sync sample version. Olov
No have not seen that before. Great, thank you, just what I was looking for. Olov
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