GENERAL DESCRIPTION

The AD9873 integrates a complete 232 MHz quadrature digital transmitter and a multichannel receiver with four high performance 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 dissi pation, and dynamic performance are critical attributes. A single external crystal is used to control all internal conversion and data processing cycles.

FEATURES

Low-Cost 3.3 V CMOS Analog Front End Converter for MCNS-DOCSIS, DVB, DAVIC-Compliant Set-Top Box, Cable Modem Applications

232 MHz Quadrature Digital Upconverter

  DC to 65 MHz Output Bandwidth

  12-Bit Direct IF D/A Converter (TxDAC+®)

  Programmable Reference Clock Multiplier (PLL)

  Direct Digital Synthesis

  Interpolator

  SIN(x)/x Compensation 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 Communications

Data and Video Modems

Cable Modem

Set-Top Boxes

Powerline Modem

Broadband Wireless Communication