John, further to this thread, look at the Analog Devices web site at their
low speed sigma-delta converters, such as the AD7705 - it's about $8 - it's
a 16 bit device.

Microchip has a line of cheap sigma-delta converters as well - look at the
TC3400. Problem is they are hard to find.

Also look at Maxim and Linear Technology and National Semiconductor - they
all have 12 bit serial A/D.

I like the Maxim ones with built in reference - I use the MAX 186 8 channel
unit and the MAX188 (I think that's the number) single channel unit.

Larry

At 02:13 PM 2/12/2003 -0800, you wrote:
>I am still working on this stupid project, but what I need is to either
>connect a 12 bit adc  to my mpu, or amplify my signal  X 2 for the 10 bit
>adc that my mpu has built in. Which would be easier to accomplish and/or
>produce the best results.
>
>If amplify, what type of amplifier would I want to use.
>
>Thanks
>
>John
>
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Larry Bradley
Orleans (Ottawa), Ontario, CANADA

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