Re: 24 Bit, dual channelADC, SPI Slave, 85 DegC (or more)
- From: Mark Borgerson <mborgerson@xxxxxxxxxxx>
- Date: Tue, 29 Sep 2009 07:14:25 -0700
In article <7iedi5F2vcad9U1@xxxxxxxxxxxxxxxxxx>, Bill@xxxxxxxxxxxxxxx
says...
Can anyone point me at something? Not going fast (480 samples/sec). Must be
available immediately (going down an oil well just after Christmas).
TIA,
Bill
There are a number of things you need to watch out for, in addition to
the temperature specification:
Very few ADCs will give you 24 bits of noise free data at 480 samples/s.
multi-channel Delta-sigma ADCs often incur a significant timing penalty
when switching between channels. To collect two channels at
480samples/s you may actually have to use a sampling rate 3 to 5 times
higher to allow the internal digital filters to settle after switching
the multiplexer.
Your best bet might be to use two separate ADCs such as the CS5532.
That would allow you to avoid the timing penalty incurred when switching
channels.
Mark Borgerson
.
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