i'm a little confused with the datasheet of the AD1938, the full scale input voltage is 1.9Vrms, but does it mean
Vadc_max = Vin+ - Vin- = 1.9Vrms
Vin+max = Vin-max = 1.9Vrms
or something else?
The 1.9 V RMS differential signal level is equivalent to a (1.9 V * 2.8) = 5.37 V p-p differential signal level. This is measured from the peak of D+ to the trough of D- in the diagram below; this is represented in your first equation: Vadc_max = Vin+ - Vin- = 1.9Vrms.
I almost forget to thank you !
This mean the differential input can handle +7,79 dBu / +5,57 dBV and each input can handle (without taking care of the common mode voltage) 2,685 Vpp. Great for high audio.
Glad to help! We do have some new stand-alone ADC products that will be releasing in the next few months. Please keep an eye out for them.
you mean with the differential adc driver included ? ok, i keep an eye even if i'm not big fan of the all-in-one because if the input "burn" in test or something else, with chance, you just have to change 1 or 2 not too much expensive device instead of the big adc with a cost. This is just my point of view of course without long background.
All of our ADCs are differential input devices. You can drive the differential input from a single-ended source, but you will not be able to drive to the top 6 dB of bits. You would only need an external driver if you wanted to convert a single-ended signal into a differential one, or if you need to change the signal level to match the level of the ADC.
The next group of ADCs can handle 2 V RMS differential, 4 V RMS differential and 10 V RMS differential signal levels. They will be 4-channel devices, just as the AD1938 has 4 ADCs. If higher performance is required, you will be able to gang together channels to improve SNR. Would any of those be of interest?
Retrieving data ...