AD9873 Datasheet | Analog Devices

a Features Low-Cost 3.3 V CMOS Analog Front End Converter for MCNS-DOCSIS, DVB, DAVIC-pliant Set-Top Box, Cable Modem Applications 232 MHz Quadrature Digital Upconverter DC to 65 MHz Output Bandwidth 12-Bit Direct IF D/A Converter (Tx DAC+ ®) Programmable Reference Clock Multiplier (PLL) Direct Digital Synthesis Interpolator SIN(x)/x pensation Filter Four Programmable, Pin-Selectable Modulator Profiles Single-Tone Mode for Frequency Synthesis Applications 12-Bit, 33 MSPS Sampling Direct IF A/D Converter with Auxiliary Automatic Clamp Video Input Multiplexer 10-Bit, 33 MSPS Sampling Direct IF A/D Converter Dual 8-Bit, 16.5 MSPS Sampling IQ A/D Converter Two Independently Programmable Sigma-Delta Converters Direct Interface to AD8321/AD8323 PGA Cable Driver Programmable Frequency Output Power-Down Modes APPLICATIONS Cable and Satellite Systems PC Multimedia Digital munications Data and Video Modems Cable Modem Set-Top Boxes Powerline Modem Broadband Wireless munication GENERAL DESCRIPTION Analog Front End Converter for Set-Top Box, Cable Modem AD9873 FUNCTIONAL BLOCK DIAGRAM COS Tx IQ Tx Tx SYNC INTERPOLATOR FILTER SIN 3 PLL SERIAL ITF PROFILE 4 2 CONTROL FUNCTIONS DDS 12 12 CA INV SINC 12 DAC Tx SDELTA0 SDELTA1 REF CLK Rx IQ Rx IF Rx SYNC 8 Rx 10 IF10 IF12 ADC MUX VIDEO The AD9873 integrates a plete 232 MHz quadrature digital transmitter and a multichannel receiver with four highperformance analog-to-digital converters (ADC) for various video and digital data signals. The AD9873 is designed for cable modem set-top box applications, where cost, size, power dissipation, and dynamic performance are critical attributes. A single external crystal is used to control all internal conversion and data processing cycles. The transmit section of the AD9873 includes a high-speed direct digital synthesizer (DDS), a high-performance, high-speed 12-bit digital-to-analog converter (DAC), programmable clock multiplier...