Data Sheet 1 GSPS Quadrature Digital Upconverter with 18-Bit I/Q Data Path and 14-Bit DAC AD9957 FEATURES 1 GSPS internal clock speed (up to 400 MHz analog output) Integrated 1 GSPS 14-bit DAC 250 MSPS input data rate Phase noise ≤ −125 dBc/Hz (400 MHz carrier @ 1 kHz offset) Excellent dynamic performance 80 dB narrow-band SFDR 8 programmable profiles for shift keying Sin(x)/(x) correction (inverse sinc filter) Reference clock multiplier Internal oscillator for a single crystal operation Software and hardware controlled power-down Integrated RAM Phase modulation capability Multichip synchronization Easy interface to Blackfin SPORT Interpolation factors from 4× to 252× Interpolation DAC mo...

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