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AD9873 Datasheet(PDF) 1 Page - Analog Devices |
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AD9873 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 39 page  REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD9873 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2000 Analog Front End Converter for Set-Top Box, Cable Modem FUNCTIONAL BLOCK DIAGRAM DAC INV SINC 12 Tx INTERPOLATOR FILTER PLL DDS SIN COS 3 12 12 4 2 MUX 8 8 10 12 Tx IQ Tx SYNC SERIAL ITF PROFILE Rx SYNC Rx IQ Rx IF AD9873 CA SDELTA0 SDELTA1 REF CLK IIN QIN IF10 IF12 VIDEO Tx CONTROL FUNCTIONS Rx ADC ADC ADC ADC 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 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. 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 circuitry, digital filters, and other digital signal processing functions, to form a complete quadrature digital up-converter device. On the receiver side, two 8-bit ADCs are optimized for IQ demodulated “out-of band” signals. An on-chip 10-bit ADC is typically used as a direct IF input of 256 QAM modulated signals in cable modem applications. A second direct IF input and an auxiliary video input with automatic programmable clamp function are multiplexed to a high-performance 12-bit video ADC. The chip’s programmable sigma-delta modulated outputs and an output clock may be used to control external components such as programmable gain amplifiers (PGA) and mixer stages. Three pins provide a direct interface to the AD8321/AD8323 programmable gain amplifier (PGA) cable driver. The AD9873 is available in a space-saving 100-lead MQFP package. TxDAC+ is a registered trademark of Analog Devices, Inc. |
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