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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)： | 32/42頁 |
| 文件大?。?/td> | 473K |
| 代理商： | AD9953 |
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PRELIMINARY TECHNICAL DATA
AD9953
Cos(X)
DDS Core
To DAC
OSK Enable
CFR<25>
0
1
Amplitude Scale
Factor Register
(ASF)
0
1
0
0
1
Out
HOLD
Up/Dn
OSK Pin
Amplitude Ramp
Rate Register
(ARR)
Load
Data
EN
Load OSK Timer
CFR1<26>
SyncClock
Clock
inc/dec Enable
Ramp Rate Timer
Auto Scale Factor Generator
AUTO OSK
Enable
CFR<24>
Figure C. On-Off Shaped Keying, Block Diagram
AUTO Shaped On-Off Keying mode operation:
The AUTO Shaped On-Off Keying mode is active when CFR1<25> and CFR1<24> are set. When
AUTO Shaped On-Off Keying mode is enabled, a single scale factor is internally generated and
applied to the multiplier input for scaling the output of the DDS core block (See Figure 9 above).
The scale factor is the output of a 14-bit counter which increments/decrements at a rate determined
by the contents of the 8-bit output ramp rate register. The scale factor increases if the OSK pin is
high, decreases if the pin is low. The scale factor is an unsigned value such that all zeros multiplies
the DDS core output by 0 (decimal) and 3FFFh multiplies the DDS core output by 16383 decimal.
For those users who use the full amplitude (14-bits) but need fast ramp rates, the internally
generated scale factor step size is controlled via the ASF<15:14> bits. The table below describes
the increment/decrement step size of the internally generated scale factor per the ASF<15:14> bits.
REV. PrB 1/30/03
Page 32
Analog Devices, Inc.
相關(guān)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(guān)代理商/技術(shù)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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