>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 25 October 2006 09:18
>To: Microcontroller discussion list - Public.
>Subject: Re: [EE] Cheap and cheerful data aquisition?
>
>
>
>On Oct 25, 2006, at 12:44 AM, Pearce, AB (Alan) wrote:
>
>>>> btw, 10 bits __is__ high resolution, anything above
>>>> or equal to 6 bits is quite good resolution.
>>>
>>> Not in my language!  12 bit ADC/DACs is the minimum
>>> I use in my job, and 16bits is more common.
>>
>> I would agree. 10 bit is low resolution, 12 & 14 bit is easily the 
>> common resolutions now, and 16 bit when the extra accuracy is needed.
>>
>10 bits means 1 bit is about 0.1% of full scale.  Are you 
>using precision components elsewhere in your circuit, or the 
>usual 5% resistors and 20% caps? :-)  Designing "the rest of 
>the circuit" to surround a a 12 or 14bit A2D is a task I find 
>rather mind boggling...

We use ultra-precision components where needed, but generaly the tempco is far more important than the tolerance as gains/offsets can almost always be calibrated out in software.  Very often it's not absolute accuracy we require anyway, but wide dynamic range.  

Regards

Mike

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