Analog to Digital Units

Guest · Post by **Guest** » Tue Jun 01, 2004 6:53 pm

What is the Analog to Digital units range that BioSemi uses? Is this listed anywhere in the documentation or webpage?
Thanks, Jake

Post by **Coen** » Tue Jun 01, 2004 9:09 pm

We use 24-bit sigma-delta analog-to digital-converters (each channels has its own converter), with the preamp gain set for a Least Significant Bit value of 1/32th uV (31.25 nV). This means an input range from +262 mV to -262 mV (+/- 2^23*31.25 nV). More on this topic is found on http://www.biosemi.com/faq/smallest_bitstep.htm, http://www.biosemi.com/faq/24bitsystem.htm, and http://www.biosemi.com/faq/adjust_gain.htm, and http://www.biosemi.com/faq/1ADC_per_channel.htm

Best regards, Coen (BioSemi)