AD6676

Data Sheet Wideband IF Receiver Subsystem AD6676 FEATURES APPLICATIONS High instantaneous dynamic range Wideband cellular infrastructure equipment and repeaters Noise figure (NF) as low as 13 dB Point-to-point microwave equipment Noise spectral density (NSD) as low as −159 dBFS/Hz Instrumentation IIP3 up to 36.9 dBm with spurious tones <−99 dBFS Spectrum and communication analyzers Tunable band-pass Σ-Δ analog-to-digital converter (ADC) Software defined radio 20 MHz to 160 MHz signal bandwidth 70 MHz to 450 MHz IF center frequency Configurable input full-scale level of −2 dBm to −14 dBm Easy to drive resistive IF input Gain flatness of 1 dB with under 0.5 dB out-of-band peaking Alias rejection greater than 50 dB 2.0 GSPS to 3.2 GSPS ADC clock rate On-chip PLL clock multiplier 16-bit I/Q rate up to 266 MSPS On-chip digital signal processing NCO and quadrature digital downconverter (QDDC) Selectable decimation factor of 12, 16, 24, and 32 Automatic gain control (AGC) support On-chip attenuator with 27 dB span in 1 dB steps GENERAL DESCRIPTION The AD66761 is a highly integrated IF subsystem that can digitize radio frequency (RF) bands up to 160 MHz in width centered on an intermediate frequency (IF) of 70 MHz to 450 MHz. Unlike traditional Nyquist IF sampling ADCs, the AD6676 relies on a tunable band-pass Σ-Δ ADC with a high oversampling ratio to eliminate the need for band specific IF SAW filters and gain stages, resulting in significant simplification of the wid...