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參數(shù)資料
| 型號： | AD9879 |
| 英文描述： | AD9879: Mixed Signal Front End Set Top Box. Cable Modem Data Sheet (Rev. 0. 10/02) |
| 中文描述： | AD9879：混合信號前端機(jī)頂盒。 Cable Modem的數(shù)據(jù)（版本0。10/02） |
| 文件頁數(shù)： | 1/24頁 |
| 文件大?。?/td> | 500K |
| 代理商： | AD9879 |
REV. 0
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. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
Tel: 781/329-4700
Fax: 781/326-8703
Analog Devices, Inc., 2002AD9879
Mixed-Signal Front End
Set-Top Box, Cable Modem
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 Sigma-Delta 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
I
Q
12
DAC
CAPORT
MCLK
RXI
RX10
RX12
VIDEO
SPORT
RXIQ[3:0]
RXIF[11:0]
Tx
16
SINC–1
DDS
PLL
XM/N
MUX
MUX
CONTROL REGISTERS
ADC
ADC
ADC
MUX
MUX
CLAMP
TX
-
- _OUT
AD9879
4
8
10
12
RXQ
2
2
GENERAL DESCRIPTION
The AD9879 is a single-supply cable modem/set-top box mixed
signal front end. The device contains a transmit path interpolation
filter, a complete quadrature digital upconverter, and a 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 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 dB to 7.5 dB in 0.5 dB steps is available to preserve SNR when
reduced output levels are required.
MxFE and TxDAC are trademarks of Analog Devices, Inc.
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 sigma-delta 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 package. It offers enhanced receive path undersampling
performance and lower cost when compared with the pin compat-
ible AD9873. The AD9879 is specified over the commercial
(–40
°
C to +85
°
C) temperature range.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD9879_05 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Mixed-Signal Front End Set-Top Box, Cable Modem |
| AD9879BS | 制造商:Analog Devices 功能描述: |
| AD9879BSZ | 功能描述:IC PROCESSOR FRONT END 100MQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模擬前端 (AFE) 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 位數(shù):- 通道數(shù):2 功率（瓦特）:- 電壓 - 電源，模擬:3 V ~ 3.6 V 電壓 - 電源，數(shù)字:3 V ~ 3.6 V 封裝/外殼:32-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:32-QFN（5x5） 包裝:帶卷 (TR) |
| AD9879BSZKL1 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| AD9879-EB | 制造商:Analog Devices 功能描述:Evaluation Board For Mixed Signal Front End Set Top Box, Cable Modem 制造商:Analog Devices 功能描述:DEV TOOLS, MIXED SGNL FRONT END SET TOP , CBL MODEM - Bulk |
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