GENERAL DESCRIPTION
The AD9856 integrates a high speed, direct digital synthesizer (DDS), a high performance, high speed, 12-bit digital-to-analog converter (DAC), clock multiplier circuitry, digital filters, and other DSP functions on a single chip to form a complete quadrature digital upconverter device. The AD9856 is intended to function as a universal I/Q modulator and agile upconverter for communications applications where cost, size, power dissipation, and dynamic performance are critical attributes.

FEATURES
    Universal low cost modulator solution for communications applications
    DC to 80 MHz output bandwidth
    Integrated 12-bit D/A converter
    Programmable sample rate interpolation filter
    Programmable reference clock multiplier
    Internal SIN(x)/x compensation filter
    >52 dB SFDR @ 40 MHz AOUT
    >48 dB SFDR @ 70 MHz AOUT
    >80 dB narrow-band SFDR @ 70 MHz AOUT
    +3 V single-supply operation
    Space-saving surface-mount packaging
    Bidirectional control bus interface
    Supports burst and continuous Tx modes
    Single-tone mode for frequency synthesis applications
    Four programmable, pin-selectable, modulator profiles
    Direct interface to AD8320/AD8321 PGA cable driver

APPLICATIONS
    HFC data, telephony, and video modems
    Wireless and satellite communications
    Cellular base stations