GENERAL DESCRIPTION
The AD7621 is a 16-bit, 3 MSPS, charge redistribution SAR, fully differential analog-to-digital converter (ADC) that operates from a single 2.5 V power supply. It 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), a fast mode (normal) for asynchronous rate applications, and a reduced power mode (impulse) for low power applications where the power is scaled with the throughput. Operation is specified from −40°C to +85°C.

FEATURES
   Throughput
   3 MSPS (wideband warp and warp mode)
   2 MSPS (normal mode)
   1.25 MSPS (impulse mode)
   2.048 V internal reference
   Differential input range: ±VREF (VREF up to 2.5 V)
   INL: ±2 LSB maximum, ±1 LSB typical
   16-bit resolution with no missing codes
   SINAD: 89 dB typical @ 100 kHz
   THD: −101 dB typical @ 100 kHz
   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
   2.5 V single-supply operation
   Power dissipation: 65 mW typical @ 3 MSPS
   48-lead LQFP and 48-lead LFCSP packages
   Speed upgrade of the AD7677

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