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參數資料
| 型號： | AD9854 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | XO, clock |
| 英文描述： | CMOS 300MHz Quadrature Complete-DDS |
| 中文描述： | 300MHz CMOS正交DDS數字合成器 |
| 文件頁數： | 8/28頁 |
| 文件大小： | 589K |
| 代理商： | AD9854 |
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AD9854 PRELIMINARY TECHNICAL DATA
_____________________________________________________________________________________________________
7/16/99 REV.PRA
8
In addition to setting the
OSK EN
bit, a second control
bit,
OSK INT
(also at address 20 hex) must be set to
logic high. Logic high selects the linear internal
control of the output ramp-up or ramp-down function.
A logic low in the OSK INT bit switches control of the
digital multipliers to user programmable 12-bit
registers allowing users to dynamically shape the
amplitude transition in practically any fashion. These
12-bit registers, labeled
“Output Shape Key I and
Output Shape Key Q
” are located at address’s 21
through 24 hex in the register layout table. The
maximum output amplitude is a function of the Rset
resistor and is not programmable; however, in the OSK
INT mode users can program any amplitude between
zero and full-scale as the maximum output level.
Next, the transition time from zero-scale to full-scale
must be programmed. The transition time is a function
of two fixed elements and one variable. The variable
element is the programmable 8-bit
RAMP RATE
COUNTER..
This is a down-counter being clocked at
the system clock rate (300 MHz max.) that outputs one
pulse whenever the counter reaches zero. This pulse is
routed to a 12-bit counter that increments one LSB for
every pulse received. The outputs of the 12-bit counter
are connected to the 12-bit digital multiplier. When the
digital multiplier has a value of all zero’s at its inputs,
the input signal is multiplier by zero, producing zero-
scale. When the multiplier has a value of all one’s, the
input signal is multiplied by a value of 1, producing
full-scale. There are 4094 remaining fractional
multiplier values that will produce output amplitudes
corresponding to their binary values.
Shaped on-off keying
Abrupt on-off keying
12 BIT DIGITAL
MULTIPLIER
DIGITIAL
SIGNAL IN
12
12
OSK EN = 1
OSK EN = 1
OSK EN = 0
OSK EN = 0
12
12-BIT
COUNTER
8-BIT DOWN
COUNTER
SYSTEM
CLOCK
1
User Programmable 12-
bit Q-channel multiplier
"Output Shape Key Q
Mult" register
OSK INT = 1
12
OSK INT = 0
SHAPED KEYING PIN
12
(Bypass Multiplier)
12-bit QDAC
register (User
programmable)
Q DAC
SRC QDAC = 1
SRC QDAC = 0
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相關代理商/技術參數 |
參數描述 |
|---|---|
| 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) |
| AD9854/PCBZ | 功能描述:BOARD EVAL FOR AD9854 RoHS:是 類別:編程器，開發系統 >> 評估演示板和套件 系列:AgileRF™ 標準包裝:1 系列:PCI Express® (PCIe) 主要目的:接口，收發器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要屬性:- 次要屬性:- 已供物品:板 |
| AD9854ASQ | 制造商:Analog Devices 功能描述:IC DDS SYNTHESIZER |
| AD9854ASQZ | 制造商:Analog Devices 功能描述:Direct Digital Synthesizer 300MHz 2-DAC 12-Bit Parallel/Serial 80-Pin LQFP 制造商:Analog Devices 功能描述:Communication IC |
| AD9854AST | 制造商:Analog Devices 功能描述:Direct Digital Synthesizer 300MHz 2-DAC 12-Bit Parallel/Serial 80-Pin LQFP Tray 制造商:Rochester Electronics LLC 功能描述:200 MHZ QUADRATURE DDS SYNTHESIZER - Tape and Reel 制造商:Analog Devices 功能描述:IC SEMICONDUCTOR ((NS)) |
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