模拟前端转换器机顶盒，电缆调制解调器 Analog Front End Converter for Set-Top Box, Cable Modem
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
SINx/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