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參數(shù)資料
| 型號： | AD9853 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Programmable Digital QPSK/16-QAM Modulator(可編程數(shù)字的四相移鍵控/16-正交幅度調(diào)制的調(diào)節(jié)器) |
| 中文描述： | 可編程數(shù)字QPSK/16-QAM調(diào)制器（可編程數(shù)字的四相移鍵控/ 16 -正交幅度調(diào)制的調(diào)節(jié)器） |
| 文件頁數(shù)： | 14/31頁 |
| 文件大小： | 339K |
| 代理商： | AD9853 |
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AD9853
–14–
REV. A
DIGITAL
QPSK/16–QAM
MODULATOR
CONPROCESSOR
SERIAL
CONTROL
BUS
GAIN CONTROL BUS
COUPLING
CIRCUIT AND
LP FILTER
POWER
DOWN
AD9853
DIRECT
CONTROL
LINES
DATA IN
REF
CLOCK IN
PROGRAMMABLE
CABLE DRIVER
AMPLIFIER
AD8320
TO
DIPLEXER
Figure 32. Basic Implementation of AD9853 Digital Modulator and AD8320 Programmable Cable Driver Amplifier in
Return-Path Application
t
RL
RESET
NOTE 1
NOTE
2
NOTE
2
CONTROL BUS
T
X
ENABLE
DAC OUT
t
DL
t
RL
: MINIMUM RESET LOW TIME = 10ns
t
DL
: DATA LATENCY = 6 SYMBOLS
NOTE 1. DURING THIS INTERVAL ALL CONTROL BUS REGISTERS MUST BE PROGRAMMED.
NOTE 2. DURING THIS INTERVAL THE CONTROL REGISTER (48h) MAY NEED TO BE REPROGRAMMED DUE TO BEING CLEARED
BY THE PRECEDING RESET PULSE.
NOTE 3. THREE RESETS ARE REQUIRED TO ENSURE THAT THE DATA PATH IS ZERO'D.
START UP
SEQUENCE
Figure 31. Recommended Start-Up Sequence
NOTES ON THE RESET FUNCTION:
1. RESET IS ACTIVE LOW
2. RESET ZEROS THE CONTROL REGISTER AT ADDRESS 48 HEX WHICH CAUSES THE FOLLOWING DEFAULT
CONDITION TO EXIST:
A. 6
3
REFCLK IS DISABLED
B. OUTPUT SPECTRUM IS SET TO I
COS+Q
3
SIN
C. DIGITAL PLL POWER-DOWN IS DISABLED
D. PLL POWER-DOWN IS DISABLED
E. DAC PLL POWER-DOWN IS DISABLED
3. SERIAL CONTROL BUS IS RESET AND INITIALIZED.
4. OUTPUTS OF MODULATION ENCODERS ARE SET TO ZERO. THIS ALLOWS THE FIR FILTERS AND
SUBSEQUENT INTERPOLATION FILTERS TO BE FLUSHED WITH ZEROS AS LONG AS T
X
ENABLE IS HELD LOW.
5. THE PREAMBLE IS CLEARED UPON EXECUTION OF THE RESET FUNCTION.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| AD9853-45PCB | 制造商:AD 制造商全稱:Analog Devices 功能描述:Programmable Digital OPSK/16-QAM Modulator |
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| AD9853AS | 制造商:Analog Devices 功能描述: 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD9854 | 制造商:AD 制造商全稱:Analog Devices 功能描述:CMOS 300 MHz Quadrature Complete-DDS |
| AD9854/PCB | 制造商:Analog Devices 功能描述:Evaluation Board For IC Digital Synthesizer Single 制造商:Analog Devices 功能描述:Direct Digital Synthesizer IC (DDS) |
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