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參數(shù)資料
型號(hào): 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(shù)字合成器
文件頁(yè)數(shù): 8/28頁(yè)
文件大小: 589K
代理商: AD9854
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(guān)代理商/技術(shù)參數(shù)
參數(shù)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)
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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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