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16 bit AD converters

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Adrian Jansen

Jan 1, 1970
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Has anyone direct experience with 16 bit ADC's ? In particular we are
trying to make a choice between the LTC 1859 and the Texas ADS 8345.
We also looked at the Analog Devices AD7686, which is comparable
specwise, but in a leadless chip package. Would like something a bit
easier to handle like a SOIC package, that we can at least prototype
fairly easily.

We need at least 7 channels, 16 bit, 100 Ksps or so. SPI bus to
processor is preferred. At that speed, SAR seems the only way to go,
which is fine. 3 or 5 volt single supply is ok. We can scale the
transducer outputs to anything reasonable inside this range.

The ultimate aim is to produce a full 16 bit real resolution over at
least 6 channels, at 100 Hz or so per scan, plus 1 channel where we can
accept lower resolution and speed. I figure that by using the speed,
we can sample and average to get at least 16 bits of real resolution.
Absolute accuracy is not too much of an issue, but resolution is.

I have use 12 bit devices for years, but I know 16 bits is a much harder
target.

Suggestions from anyone who has used either or both these devices, or
any others with similar performance are welcome.
 
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Adrian Jansen

Jan 1, 1970
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Thanks to all for the comments, useful info.
 
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