GENERAL DESCRIPTION
The AD7291 is a 12-bit, low power, 8-channel, successive approximation analog-to-digital converter (ADC) with an internal temperature sensor.
The device operates from a single 3.3 V power supply and features an I2C-compatible interface. The device contains a 9- channel multiplexer and a track-and-hold amplifier than can handle frequencies up to 30 MHz. The device has an on-chip 2.5 V reference that can be disabled to allow the use of an external reference.

FEATURES
   12-bit SAR ADC
      8 single-ended analog input channels
      Analog input range: 0 V to 2.5 V
   12-bit temperature-to-digital converter
      Temperature sensor accuracy of ±1°C typical
   Channel sequencer operation
   Specified for VDD of 2.8 V to 3.6 V
   Logic voltage VDRIVE = 1.65 V to 3.6 V
   Internal 2.5 V reference
   I2C-compatible serial interface supports standard and
      fast speed modes
   Out of range indicator/alert function
   Autocycle mode
   Power-down current: 12 μA maximum
   Temperature range: −40°C to +125°C
   20-lead LFCSP package