GENERAL DESCRIPTION
The AD7679 is an 18-bit, 570 kSPS, charge redistribution SAR, fully differential analog-to-digital converter that operates on a single 5 V power supply. The part contains a high speed 18-bit sampling ADC, an internal conversion clock, an internal reference buffer, error correction circuits, and both serial and parallel system interface ports.
The part is available in a 48-lead LQFP or 48-lead LFCSP with operation specified from –40°C to +85°C.

FEATURES
   18-bit resolution with no missing codes
   No pipeline delay (SAR architecture)
   Differential input range: ±VREF (VREF up to 5 V)
   Throughput: 570 kSPS
   INL: ±2.5 LSB max (±9.5 ppm of full scale)
   Dynamic range : 103 dB typ (VREF = 5 V)
   S/(N+D): 100 dB typ @ 2 kHz (VREF = 5 V)
   Parallel (18-,16-, or 8-bit bus) and serial 5 V/3 V interface
   SPI®/QSPI™/MICROWIRE™/DSP compatible
   On-board reference buffer
   Single 5 V supply operation
   Power dissipation: 76 mW @ 500 kSPS
                                 150 μW @ 1 kSPS
   48-lead LQFP or 48-lead LFCSP package
   Pin-to-pin compatible upgrade of AD7674/AD7676/AD7678

APPLICATIONS
   CT scanners
   High dynamic data acquisition
   Geophone and hydrophone sensors
   Σ-Δ replacement (low power, multichannel)
   Instrumentation
   Spectrum analysis
   Medical instruments