GENERAL DESCRIPTION
The AD7091R-2/AD7091R-4/AD7091R-8 family is a multichannel 12-bit, ultralow power, successive approximation analog-to-digital converter (ADC) that is available in two, four, or eight analog input channel options. The AD7091R-2/AD7091R-4/AD7091R-8 operate from a single 2.7 V to 5.25 V power supply and are capable of achieving a sampling rate of 1 MSPS.

FEATURES
   Ultralow system power
      Flexible power/throughput rate management
      Normal mode
         1.4 mW at 1 MSPS
      Power-down mode
         550 nA typical at VDD = 5.25 V
         435 nA typical at VDD = 3 V
      Programmable ALERT interrupt pin (4-/8-channel models)
   High performance
      1 MSPS throughput with no latency/pipeline delay
      SNR: 70 dB typical at 10 kHz input frequency
      THD: −80 dB typical at 10 kHz input frequency
      INL: ±0.7 LSB typical, ±1.0 LSB maximum
   Small system footprint
      On-chip accurate 2.5 V reference, 5 ppm/°C typical drift
      MUXOUT/ADCIN to allow single buffer amplifier
      Daisy-chain mode
      16-lead, 20-lead, and 24-lead 4 mm × 4 mm LFCSP packages
      16-lead, 20-lead, and 24-lead TSSOP packages
   Easy to use
      SPI/QSPI™/MICROWIRE™/DSP compatible digital interface
      Integrated programmable channel sequencer
      BUSY indication available (4-/8-channel models)
   Built in features for control and monitoring applications
      GPOx pins available (4-/8-channel models)
   Wide operating range
      Temperature range: −40°C to +125°C
      Specified for VDD of 2.7 V to 5.25 V
  
APPLICATIONS
   Battery-powered systems
   Personal digital assistants
   Medical instruments
   Mobile communications
   Instrumentation and control systems
   Data acquisition systems
   Optical sensors
   Diagnostic/monitoring functions