GENERAL DESCRIPTION
The AD7666 is a 16-bit, 500 kSPS, charge redistribution SAR analog-to-digital converter that operates from a single 5 V power supply. The part contains a high speed, 16-bit sampling ADC, an internal conversion clock, internal reference, error correction circuits, and both serial and parallel system interface ports. The AD7666 is hardware factory-calibrated and comprehensively tested to ensure ac parameters such as signal-to-noise ratio (SNR) and total harmonic distortion (THD), in addition to the more traditional dc parameters of gain, offset, and linearity.

FEATURES
    2.5 V internal reference: typical drift 3 ppm/°C Guaranteed max drift 15 ppm/°C
    Throughput: 500 kSPS
    INL: ±2.0 LSB max (±0.0038% of full scale)
    16-bit resolution with no missing codes
    S/(N+D): 88 dB min @ 20 kHz
    THD: –96 dB max @ 20 kHz
    Analog input voltage range: 0 V to 2.5 V
    Both AC and DC specifications
    No pipeline delay
    Parallel and serial 5 V/3 V interface
    SPI®/QSPITM/MICROWIRETM/DSP compatible
    Single 5 V supply operation
    Power dissipation 66 mW typ, 132 µW @ 1 kSPS without REF 81 mW typ with REF
    48-lead LQFP and 48-lead LFCSP packages
    Pin-to-pin compatible with PulSAR ADCs

APPLICATIONS
    Data acquisition
    Medical instruments
    Digital signal processing
    Spectrum analysis
    Instrumentation
    Battery-powered systems
    Process control