GENERAL DESCRIPTION
The AD6620 is a digital receiver with four cascaded signal-processing elements: a frequency translator, two fixed-coefficient decimating filters, and a programmable coefficient decimating filter. All inputs are 3.3 V LVCMOS compatible. All outputs are LVCMOS and 5 V TTL compatible.

FEATURES
    High Input Sample Rate
        67 MSPS Single Channel Real
        33.5 MSPS Diversity Channel Real
        33.5 MSPS Single Channel Complex
    NCO Frequency Translation
        Worst Spur Better than –100 dBc
        Tuning Resolution Better than 0.02 Hz
    2nd Order Cascaded Integrator Comb FIR Filter
        Linear Phase, Fixed Coefficients
        Programmable Decimation Rates: 2, 3 . . . 16
    5th Order Cascaded Integrator Comb FIR Filter
        Linear Phase, Fixed Coefficients
        Programmable Decimation Rates: 1, 2, 3 . . . 32
    Programmable Decimating RAM Coefficient FIR Filter
        Up to 134 Million Taps per Second
        256 20-Bit Programmable Coefficients
        Programmable Decimation Rates: 1, 2, 3 . . . 32
    Bidirectional Synchronization Circuitry
        Phase Aligns NCOs
        Synchronizes Data Output Clocks
    Serial or Parallel Baseband Outputs
        Pin Selectable Serial or Parallel
        Serial Works with SHARC®, ADSP-21xx, Most Other DSPs
        16-Bit Parallel Port, Interleaved I and Q Outputs
    Two Separate Control and Configuration Ports
        Generic μP Port, Serial Port
    3.3 V Optimized CMOS Process
    JTAG Boundary Scan