Tom, I've used the MAX186 in a few 16C73/74 projects. I don't use the
hardware SPI interface. Instead, I drive the related Port C pins in
software. The A/D is in the Unipolar, Single-ended, Internal Clock mode and
I monitor the Busy status via another Port C pin. If you go that route, I
can be of help. In one project, the A/D measures barometric pressure,
humidity, and temperature. I've had excellent results using the internal
4.096V reference and the recommended Ref adjust circuit. I calibrate it
using an onboard precision 2.048V reference that's jumper-selectable to
channel 8. Over the last year, it has not needed adjustment.

   - Tom

At 02:12 PM 10/21/97 EST, you wrote:
>     Greetings All,
>
>     I'm going to be using a MAX186 A/D with a 16C73. There seems to be a
>     problem with the SCLK and MISO. If I am reading the specs right, the
>     PIC samples data on the rising edge of SCLK. At the same time the
>     MAX186 is placing data on the MISO line ( it is expecting the data to
>     be read on the rising edge of the next clock ). Thus the PIC will
>     always miss the data.
>
>     Has anybody done this before? I see software bit banging in my future
>     ;-(
>
>
>
>     Thanks in advance,
>
>     Tom Hoover
>
>
>
>+------------------------------------------+---------------------------+
>|                                          |    __   _                 |
>| Tom Hoover                               |   / /  (_)__  __ ____  __ |
>| Software Engineer, CSQE #330             |  / /__/ / _ \/ // /\ \/ / |
>| Telepath Instruments                     | /____/_/_//_/\_,_/ /_/\_\ |
>| 221 South Yorkshire Street               |                           |
>| Salem, Virginia 24175, USA               | *For IQ's Higher Than 95* |
>| PHONE 540.365..0582   FAX 540.365.0505   +---------------------------+
>| Email hoovert@ttc.com                                                |
>|                                                                      |
>+----------------------------------------------------------------------+
>
>