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AD9879-EB 데이터시트(PDF) 1 Page - Analog Devices |
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AD9879-EB 데이터시트(HTML) 1 Page - Analog Devices |
1 / 32 page Mixed-Signal Front End Set-Top Box, Cable Modem AD9879 Rev. A 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 that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved. FEATURES Low cost 3.3 V MxFE™ for DOCSIS-, EURO-DOCSIS-, DVB-, DAVIC-compliant set-top box and cable modem applications 232 MHz quadrature digital upconverter 12-bit direct IF DAC (TxDAC+™) Up to 65 MHz carrier frequency DDS Programmable sampling clock rates 16× upsampling interpolation LPF Single-tone frequency synthesis Analog Tx output level adjust Direct cable amp interface 12-bit, 33 MSPS direct IF ADC with optional video clamping input 10-bit, 33 MSPS direct IF ADC Dual 7-bit, 16.5 MSPS sampling I/Q ADC 12-bit Σ-∆ auxiliary DAC APPLICATIONS Cable modem and satellite systems Set-top boxes Power line modem PC multimedia Digital communications Data and video modems QAM, OFDM, FSK modulation FUNCTIONAL BLOCK DIAGRAM TX DATA SPORT RXIQ[3:0] RXIF[11:0] VIDEO RX12 RX10 RXQ RXI MCLK CA_PORT TX DAC SINC–1 TX DDS Q I CONTROL REGISTERS PLL XM/N MUX ADC ADC ADC CLAMP AD9879 ⇑16 MUX MUX 8 10 12 MUX Σ-∆_OUT Σ-∆ 4 2 2 12 Figure 1. GENERAL DESCRIPTION The AD9879 is a single-supply set-top box and cable modem mixed-signal front end. The device contains a transmit path interpolation filter, complete quadrature digital upconverter, and transmit DAC. The receive path contains a 12-bit ADC, a 10-bit ADC, and dual 7-bit ADCs. All internally required clocks and an output system clock are generated by the phase-locked loop (PLL) from a single crystal or clock input. The transmit path interpolation filter provides an upsampling factor of 16× with an output signal bandwidth as high as 8.3 MHz. Carrier frequencies up to 65 MHz with 26 bits of frequency tuning resolution can be generated by the direct digital synthesizer (DDS). The transmit DAC resolution is 12 bits and can run at sampling rates as high as 232 MSPS. Analog output scaling from 0.0 dB to 7.5 dB in 0.5 dB steps is available to preserve SNR when reduced output levels are required. The 12-bit and 10-bit IF ADCs can convert direct IF inputs up to 70 MHz and run at sample rates up to 33 MSPS. A video input with an adjustable signal clamping level, along with the 10-bit ADC, allow the AD9879 to process an NTSC and a QAM channel simultaneously. The programmable Σ-Δ DAC can be used to control external components, such as variable gain amplifiers (VGAs) or voltage controlled tuners. The CA port provides an interface to the AD8321/AD8323 or AD8322/AD8327 programmable gain amplifier (PGA) cable drivers, enabling host processor control via the MxFE SPORT. The AD9879 is available in a 100-lead MQFP. It offers enhanced receive path undersampling performance and lower cost when compared with the pin-compatible AD9873. The AD9879 is specified over the commercial (−40°C to +85°C) temperature range. |
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