GENERAL DESCRIPTION
The AD7991/AD7995/AD7999 are 12-/10-/8-bit, low power, successive approximation ADCs with an I2C®-compatible interface. Each part operates from a single 2.7 V to 5.5 V power supply and features a 1 μs conversion time. The track-and-hold amplifier allows each part to handle input frequencies of up to 14 MHz, and a multiplexer allows taking samples from four channels. 

FEATURES
12-/10-/8-bit ADCs with fast conversion time: 1 μs typical
4 analog input channels/3 analog input channels with reference input
Specified for VDDof 2.7 V to 5.5 V
Sequencer operation
Temperature range: −40°C to +125°C
I2C-compatible serial interface supports standard, fast, and high speed modes
2 versions allow 2 I2C addresses
Low power consumption
  Shutdown mode: 1 μA maximum
8-lead SOT-23 package

APPLICATIONS
System monitoring
Battery-powered systems
Data acquisition
Medical instruments