GENERAL DESCRIPTION
The AD7622 is a 16-bit, 2 MSPS, charge redistribution SAR, fully differential, analog-to-digital converter (ADC) that operates from a single 2.5 V power supply. The part contains a high speed, 16-bit sampling ADC, an internal conversion clock, an internal reference (and buffer), error correction circuits, and both serial and parallel system interface ports. It features two very high sampling rate modes (wideband warp and warp) and a fast mode (normal) for asynchronous rate applications. The AD7622 is hardware factory calibrated and tested to ensure ac parameters, such as signal-to-noise ratio (SNR), in addition to the more traditional dc parameters of gain, offset, and linearity. The AD7622 is available in Pb-free only packages with operation specified from −40°C to +85°C.

FEATURES
   Throughput
      2 MSPS (wideband warp and warp mode)
      1.5 MSPS (normal mode)
   INL: ±0.5 LSB typical, ±1.5 LSB maximum (±23 ppm of FSR)
   16-bit resolution with no missing codes
   Dynamic range: 92.5 dB typical
   SINAD: 91 dB minimum @ 20 kHz (VREF = 2.5 V)
   THD: −115 dB typical @ 20 kHz (VREF = 2.5 V)
   2.048 V internal reference: typical drift 8 ppm/°C; TEMP output
   Differential input range: ±VREF (VREF up to 2.5 V)
   No pipeline delay (SAR architecture)
   Parallel (16-, or 8-bit bus) and serial 5 V/3.3 V/2.5 V interface
   SPI®/QSPI™/MICROWIRE™/DSP compatible
   Single 2.5 V supply operation
   Power dissipation
      70 mW typical @ 2 MSPS with internal REF
      2 μW in power-down mode
   Pb-free, 48-lead LQFP and 48-lead LFCSP
   Pin compatible with other PulSAR 48-lead ADCs

APPLICATIONS
   Medical instruments
   High speed data acquisition/high dynamic data acquisition
   Digital signal processing
   Spectrum analysis
   Instrumentation
   Communications
   ATE