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參數資料
| 型號： | AD9954 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | XO, clock |
| 英文描述： | 400 MSPS 14-Bit, 1.8 V CMOS Direct Digital Synthesizer |
| 中文描述： | 400 MSPS的14位，1.8伏的CMOS直接數字頻率合成 |
| 文件頁數： | 26/36頁 |
| 文件大?。?/td> | 1027K |
| 代理商： | AD9954 |
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AD9954
Rev. 0 | Page 26 of 36
0
FTW0
SINGLE–TONE
MODE
LINEAR SWEEP MODE
AT POINT A: LOAD RISING RAMP RATE REGISTER, APPLY RISING DFTW.
AT POINT B: LOAD FALLING RAMP RATE REGISTER, APPLY FALLING DFTW.
PS<0> = 1
PS<0> = 0
PS<0> = 0
TIME
FTW1
A
B
F
OUT
Figure 20. Linear Sweep Frequency Plan
0
FTW0
SINGLE–TONE
MODE
LINEAR SWEEP MODE ENABLE–NO DWELL BIT SET
FTW1
A
A
A
B
B
B
F
OUT
TIME
PS<0> = 1 PS<0> = 0
PS<0> = 0
PS<0> = 1
PS<0> = 1
PS<0> = 0
Figure 21. Linear Sweep Using No Dwell Frequency Plan
Linear Sweep No Dwell Feature
The linear sweep function can be operated with a no dwell fea-
ture. If the linear sweep no dwell bit is set, CFR1<2> = 1, the
rising sweep is started in an identical manner to the non-no
dwell linear sweep mode. Upon detecting a rising edge on the
PS<0> input pin, the rising sweep action is initiated. The fre-
quency continues to sweep up at the rate set by the rising sweep
ramp rate at the resolution set by the rising delta frequency
tuning word until it reaches the terminal frequency. Upon
reaching the terminal frequency, the output frequency immedi-
ately returns to the starting frequency and remains at the start-
ing frequency until the device detects a subsequent rising edge
on the PS<0> pin. Figure 21 is an example of the linear sweep
mode operation when the linear sweep no dwell bit is set. The
points labeled A indicate where a rising edge on PS0 is detected;
the points labeled B indicate where the AD9954 has determined
F
OUT
has reached the terminal frequency and automatically
returns to the starting frequency. Note that in this mode, each
sweep will require a separate rising edge on the Profile <0> pin.
Linear sweeps using the no-dwell bit can only be swept from
FTW0 to FTW1 using the positive linear sweep control word.
Toggling the PS<0> from 1 to 0 will not initiate a falling sweep
when the no dwell bit is set, nor will it interrupt a positive
sweep already underway.
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| AD9956 | 2.7 GHz DDS-Based AgileRF |
| AD9956YCPZ-REEL1 | 2.7 GHz DDS-Based AgileRF |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD9954/PCB | 制造商:Analog Devices 功能描述:AD9954 400 MSPS DDS W/ 14 BIT DAC EVALBD - Bulk 制造商:Analog Devices 功能描述:EVALUATION KIT ((NS)) |
| AD9954/PCBZ | 功能描述:BOARD EVAL FOR 9954 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:PSoC® 主要目的:電源管理，熱管理 嵌入式:- 已用 IC / 零件:- 主要屬性:- 次要屬性:- 已供物品:板，CD，電源 |
| AD9954/PCBZ1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:400 MSPS, 14-Bit, 1.8 V CMOS, Direct Digital Synthesizer |
| AD9954_09 | 制造商:AD 制造商全稱:Analog Devices 功能描述:400 MSPS, 14-Bit, 1.8 V CMOS, Direct Digital Synthesizer |
| AD9954YSV | 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:400 MSPS DDS W/14 BIT DAC - Bulk 制造商:Analog Devices 功能描述:IC DDS 400MSPS SMD 9954 TQFP48 |
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