參數(shù)資料
型號： AD9953
廠商： Analog Devices, Inc.
元件分類： XO, clock
英文描述： 400 MSPS 14-Bit, 1.8V CMOS Direct Digital Synthesizer
中文描述： 400 MSPS的14位，1.8V CMOS的直接數(shù)字頻率合成器
文件頁數(shù)： 29/42頁
文件大?。?/td> 473K
代理商： AD9953
PRELIMINARY TECHNICAL DATA
Profile<1:0> pins and enables the AD9953 to take control of switching between profiles. Modes
are defined that allow continuous or single burst profile switches for three combinations of profile
selection bits. These are listed in the table below. When the any of the CFR1<29:27> bits are
active, the internal profile control mode is engaged.
When the internal profile control mode is engaged, the RAM Segment Mode Control bits are
“Don’t care” and the device operates all profiles as if these mode control bits were programmed for
Ramp-Up mode. Switching between profiles occurs when the RAM address generator has
exhausted the memory contents for the current profile.
CFR1<29:27>
(binary)
000
Internal Control Inactive
001
Internal Control Active, Single Burst, activate profile 0, then 1, then
stop
010
Internal Control Active, Single Burst, activate profile 0, then 1, then 2,
then stop
011
Internal Control Active, Single Burst, activate profile 0, then 1, then 2,
then 3, then stop
100
Internal Control Active, Continuous, activate profile 0, then 1, then
loop starting at 0.
101
Internal Control Active, Continuous, activate profile 0, then 1, then 2,
then loop starting at 0.
110
Internal Control Active, Continuous, activate profile 0, then 1, then 2,
then 3, then loop starting at 0
111
Invalid
Table 4 Internal Profile Control
A single burst mode is one in which the composite sweep is executed once. For example, assume
the device is programmed for Ramp-Up mode and the CFR1<29:27> bits are written to 010(b).
Upon receiving an I/O UPDATE, the internal control logic signals the device to begin executing
the Ramp-Up mode sequence for profile 0. Upon reaching the RAM Segment Final Address value
for profile 0, the device automatically switches to profile 1 and begins executing that Ramp-Up
sequence. Upon reaching the RAM Segment Final Address value for profile 1, the device
automatically switches to profile 2 and begins executing that Ramp-Up sequence. When the RAM
Segment Final Address value for profile 2 is reached, the sequence is over and the composite
sweep has completed. Issuing another I/O UPDATE re-starts the burst process.
A continuous internal profile control mode is one in which the composite sweep is continuously
executed for as long as the device is programmed into that mode. Using the example above, except
programming the CFR1<29:27> bits to 101(b), the operation would be identical until the RAM
AD9953
Mode Description
REV. PrB 1/30/03
Page 29
Analog Devices, Inc.
相關PDF資料
PDF描述
AD9953ASV 400 MSPS 14-Bit, 1.8V CMOS Direct Digital Synthesizer
AD9953PCB 400 MSPS 14-Bit, 1.8V CMOS Direct Digital Synthesizer
AD9954 400 MSPS 14-Bit, 1.8 V CMOS Direct Digital Synthesizer
AD9954YSV 400 MSPS 14-Bit, 1.8 V CMOS Direct Digital Synthesizer
AD9954YSV-REEL7 400 MSPS 14-Bit, 1.8 V CMOS Direct Digital Synthesizer
相關代理商/技術參數(shù)
參數(shù)描述
AD9953/PCB 制造商:Analog Devices 功能描述:400 MSPS, 14BIT DGTL SYNTHESIZER - Bulk
AD9953ASV 制造商:AD 制造商全稱:Analog Devices 功能描述:400 MSPS 14-Bit, 1.8V CMOS Direct Digital Synthesizer
AD9953PCB 制造商:AD 制造商全稱:Analog Devices 功能描述:400 MSPS 14-Bit, 1.8V CMOS Direct Digital Synthesizer
AD9953YSV 制造商:Analog Devices 功能描述:Direct Digital Synthesizer 400MHz 1-DAC 14-Bit Serial 48-Pin TQFP EP 制造商:Rochester Electronics LLC 功能描述:AD9953 400 MSPS DDS W/ 14 BIT DAC - Bulk 制造商:Analog Devices 功能描述:IC DDS 400MSPS SMD 9953 TQFP48
AD9953YSV-REEL7 制造商:Analog Devices 功能描述:Direct Digital Synthesizer 400MHz 1-DAC 14-Bit Serial 48-Pin TQFP EP T/R
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