GENERAL DESCRIPTION
The AD7949 is an 8-channel, 14-bit, charge redistribution successive approximation register (SAR) analog-to-digital converter (ADC) that operates from a single power supply, VDD.

FEATURES
   14-bit resolution with no missing codes
   8-channel multiplexer with choice of inputs
      Unipolar single-ended
      Differential (GND sense)
      Pseudobipolar
   Throughput: 250 kSPS
   INL/DNL: ±0.5/±0.25 LSB typical
   SINAD: 85 dB @ 20 kHz
   THD: −100 dB @ 20 kHz
   Analog input range: 0 V to VREF with VREF up to VDD
   Multiple reference types
      Internal selectable 2.5 V or 4.096 V
      External buffered (up to 4.096 V)
      External (up to VDD)
   Internal temperature sensor (TEMP)
   Channel sequencer, selectable 1-pole filter, busy indicator
   No pipeline delay, SAR architecture
   Single-supply 2.3 V to 5.5 V operation with
      1.8 V to 5.5 V logic interface
   Serial interface compatible with SPI, MICROWIRE,
      QSPI, and DSP
   Power dissipation
      2.9 mW @ 2.5 V/200 kSPS
      10.8 mW @ 5 V/250 kSPS
   Standby current: 50 nA
   20-lead 4 mm × 4 mm LFCSP package

APPLICATIONS
   Multichannel system monitoring
   Battery-powered equipment
   Medical instruments: ECG/EKG
   Mobile communications: GPS
   Power line monitoring
   Data acquisition
   Seismic data acquisition systems
   Instrumentation
   Process control