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