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參數(shù)資料
| 型號(hào)： | AD9854AST |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | XO, clock |
| 英文描述： | CMOS 300 MHz Quadrature Complete-DDS |
| 中文描述： | PLL FREQUENCY SYNTHESIZER, 200 MHz, PQFP80 |
| 封裝： | MS-026BEC, LQFP-80 |
| 文件頁數(shù)： | 20/44頁 |
| 文件大?。?/td> | 433K |
| 代理商： | AD9854AST |
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AD9854
–20–
REV. 0
F1
F2
0
F
MODE
TW1
TW2
FSK DATA
TRIANGLE
BIT
010 (RAMPED FSK)
F1
F2
Figure 40. Effect of Triangle Bit in Ramped FSK Mode
Generally speaking, the Delta Frequency Word will be a much
smaller value as compared to that of the F1 or F2 tuning word.
For example, if F1 and F2 are 1 kHz apart at 13 MHz, the
Delta Frequency Word might be only 25 Hz.
Figure 41 shows that premature toggling causes the ramp to
immediately reverse itself and proceed at the same rate and resolu-
tion back to originating frequency.
F2
F1
0
F
MODE
TW1
TW2
FSK DATA
TRIANGLE BIT
000 (DEFAULT)
0
0
010 (RAMPED FSK)
F1
F2
Figure 42. Automatic Linear Ramping Using the Triangle Bit
The control register contains a Triangle
bit
at parallel register
address 1F hex. Setting this bit high in Mode 010 causes an
automatic
ramp-up and ramp-down between F1 and F2 to occur
without having to toggle Pin 29 as shown in Figure 40. In fact,
the logic state of Pin 29 has no effect once the Triangle bit is set
high. This function uses the ramp-rate clock time period and
the delta-frequency-word step size to form a
continuously
sweeping
linear ramp from F1 to F2 and back to F1 with equal dwell times
at every frequency. Using this function, one can automatically
sweep from dc to the Nyquist limit or any other two frequencies
between dc and Nyquist.
F1
F2
0
F
MODE
TW1
TW2
FSK DATA
F1
F2
000 (DEFAULT)
0
0
010 (RAMPED FSK)
Figure 41. Effect of Premature Ramped FSK Data
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD9854ASTZ | 功能描述:IC DDS QUADRATURE CMOS 80-LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 直接數(shù)字合成 (DDS) 系列:- 產(chǎn)品變化通告:Product Discontinuance 27/Oct/2011 標(biāo)準(zhǔn)包裝:2,500 系列:- 分辨率（位）:10 b 主 fclk:25MHz 調(diào)節(jié)字寬（位）:32 b 電源電壓:2.97 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:帶卷 (TR) |
| AD9854ASVZ | 制造商:Analog Devices 功能描述:CMOS 300 MSPS QUADRATURE COMPLETE DDS 制造商:Analog Devices 功能描述:CMOS 300 MSPS QUADRATURE COMPLETE DDS - Trays 制造商:Analog Devices 功能描述:SYNTHESIZER 制造商:Analog Devices 功能描述:Complete DDS Quadrature 300MSPS TQFP80 |
| AD9854PCB | 制造商:AD 制造商全稱:Analog Devices 功能描述:CMOS 300 MSPS Quadrature Complete DDS |
| AD9856 | 制造商:AD 制造商全稱:Analog Devices 功能描述:CMOS 200 MHz Quadrature Digital Upconverter |
| AD9856/PCB | 制造商:Analog Devices 功能描述:Evaluation Board For Digital Up Converter 56 Pin LFCSP Ep 制造商:Analog Devices 功能描述:DGTL UP CNVRTR 56LFCSP - Bulk |
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