Re: [CAD_CAM_EDM_DRO] EMC and lathes?

On Wed, 22 Dec 2010 00:14:52 -0600, you wrote:

>kabowers@... wrote:
>>>
>>>
>> Thanks for the info.
>>
>> That chip looks to be a good way to go. I had laid out an AD2S1200 PC board and bought
>> the parts quite some time ago, but other projects have taken precedence :(
>> Look likes we're headed in the same direction.
>>
>>
>Well, there is more to it. The chip needs a three-step reset sequence,
>so I had to put a CPLD on
>there to handle it. Also, their reference design has some problems in
>the boosted op-amp circuit,
>and you need more options on the gain settings if you don't want to have
>to solder resistors to
>set the right drive level so the chip gets the signal level it needs on
>any particular resolver.
>
>Jon
>
>
>------------------------------------

The test circuit on the datasheet isn't exactly complete. Minimal
information on the opamp. IIRC the early datasheets on the family
omitted current/power dissipation completely.
Thanks for the head sup on the reset.I was expecting to have to fiddle
with the resistor values. I had noticed the reset was a bit unusual,
but had missed the three step part. At lease I haven't etched a board yet.
I REALLY wish that family was available in DIP packages. Homebrewing
boards for 44-LQFP footprint is a strain and I don't have the equipment
to remove them if I goof 8=(

Keith Bowers WB4LSJ- Thomasville, NC