(2008.10.02) [EMAIL PROTECTED]:
> Which A/D were you thinking about using?

I like the ADS1158 from Texas Instruments. This is the same unit
proposed for the Openahrms robot navigation project coming out of the
Portland area Robotics Society.

Features:
  Not too expensive for us (~20$ in small quantities)
  Reasonable package size (qfn-48)
  24 bit converter
  125 ksps
  16 channel mux
  Configured for external amplifier
  On board PLL for clock, will run on 32kHz watch crystal
  Includes 8 bit uncommitted GPIO
  SPI interface
  Reasonable power dissipation (50mW)
  On chip temperature sensor

Missing:
  It would be nice if it ran at lower voltages (requires 5V)
  Requires external reference
  No internal amplifier


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