GENERAL DESCRIPTION
The AD7942 is a 14-bit, charge redistribution, successive approximation PulSAR® ADC that operates from a single power supply, VDD, between 2.3 V to 5.5 V. It contains a low power, high speed, 14-bit sampling ADC with no missing codes, an internal conversion clock, and a versatile serial interface port. The part also contains a low noise, wide bandwidth, short aperture delay track-and-hold circuit. On the CNV rising edge, it samples an analog input, IN+, between 0 V to VREF with respect to a ground sense, IN−. The reference voltage, VREF, is applied externally and is set up to be the supply voltage. Its power scales linearly with the throughput.

FEATURES
   14-bit resolution with no missing codes
   Throughput: 250 kSPS
   INL: ±0.4 LSB typical, ±1 LSB maximum (±0.0061% of FSR)
   SINAD: 85 dB at 20 kHz
   THD: −100 dB at 20 kHz
   Pseudo differential analog input range
      0 V to VREF with VREF up to VDD
   No pipeline delay
   Single-supply 2.3 V to 5.5 V operation with
      1.8 V/2.5 V/3 V/5 V logic interface
   Proprietary serial interface
      SPI-/QSPI-/MICROWIRE-/DSP-compatible1
   Daisy-chaining for multiple ADCs and busy indicator
   Power dissipation
      1.25 mW at 2.5 V/100 kSPS, 3.6 mW at 5 V/100 kSPS
      1.25 μW at 2.5 V/100 SPS
   Standby current: 1 nA
   10-lead package: MSOP and 3 mm × 3 mm LFCSP
   Pin-for-pin compatible with the 16-bit AD7685

APPLICATIONS
   Battery-powered equipment
   Data acquisition
   Instrumentation
   Medical instruments
   Process controls