AD9957

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 mode Gain control DAC Internal divider allows references up to 2 GHz 1.8 V and 3.3 V power supplies 100-lead TQFP_EP package APPLICATIONS HFC data, telephony, and video modems Wireless base station transmissions Broadband communications transmissions Internet telephony GENERAL DESCRIPTION The AD9957 functions as a universal I/Q modulator and agile upconverter for communications systems where cost, size, power consumption, and dynamic performance are critical. The AD9957 integrates a high speed, direct digital synthesizer (DDS), a high performance, high speed, 14-bit digital-to-analog converter (DAC), clock multiplier circuitry, digital filters, and other DSP functions onto a single chip. It provides baseband upconversion for data transmission in a wired or wireless communications system. Th...