Other Parts Discussed in Thread: ADS127L11, ADS127L18, ADS127L14
Hi, gentlemen,
I have a question after my first light with ADS1263. Maybe question partially will look silly but I'm originally a computer scientics with some old backgroud in electronics.
My 1st question:
1) ADS1263 has many commuted inputs. Of course we wonder if we can sample 2 differential channels simultaneously switching these channels inputs for ADC1 in ADS1263. The problem is than we need 10k SPS from both channeds, so we need to switch channels with 20K/second rate. Ok, in ADS1263 ref. manual I see that ADC setup time is 52us. As setup time is unavoidable, it limits switching rate down less than 5K/sec.
Am I right in my calculations?
2) I also looked precisely into ADS1263 doc and see that real noise-free bits are something like 21-22 for 10kSPS. It's good enough, but....
The question is: can you recommend several ADCs from TI product line, with precision 24-28 bits at 10kSPS, with price less than $15-20 for 1K units. Low-noise pre-amplifier inside an ADC looks ok, as it can limit necessary number of bits under 24. One of case I've seen is ADS127L11, 24bit, with 22 noise free bits on 10kSPS, for our signals it requires pre-amplification, that's OK. But maybe there are other possibilities from TI product lines.
Thank you,
D.