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參數資料
| 型號： | AD9851 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | XO, clock |
| 英文描述： | CMOS 180 MHz DDS/DAC Synthesizer |
| 中文描述： | 180MHz的CMOS/DAC頻率合成器 |
| 文件頁數： | 12/23頁 |
| 文件大小： | 277K |
| 代理商： | AD9851 |
AD9851
–12–
REV. 0
FQ UD
W2
DATA
40 W CLK CYCLES
W CLK
W1
W3
W39
W0
Figure 19. Serial-Load Frequency/Phase Update Sequence
Table III. 40-Bit Serial-Load Word Functional Assignment
W0
W1
W2
W3
W4
W5
W6
W7
W8
W9
W10
W11
W12
Freq–b0 (LSB)
Freq–b1
Freq–b2
Freq–b3
Freq–b4
Freq–b5
Freq–b6
Freq–b7
Freq–b8
Freq–b9
Freq–b10
Freq–b11
Freq–b12
W13
W14
W15
W16
W17
W18
W19
W20
W21
W22
W23
W24
W25
W26
Freq–b13
Freq–b14
Freq–b15
Freq–b16
Freq–b17
Freq–b18
Freq–b19
Freq–b20
Freq–b21
Freq–b22
Freq–b23
Freq–b24
Freq–b25
Freq–b26
W27
W28
W29
W30
W31
W32
Freq–b27
Freq–b28
Freq–b29
Freq–b30
Freq–b31 (MSB)
6
×
REFCLK Multi-
plier Enable
Logic 0*
Power-Down
Phase–b0 (LSB)
Phase–b1
Phase–b2
Phase–b3
Phase–b4 (MSB)
W33
W34
W35
W36
W37
W38
W39
*This bit is always Logic 0.
FQ UD
W34 = 1
OR 0
DATA (7) –
40 W_CLK RISING EDGES
W CLK
W33 = 0
W35 = X
W39 = X
W38 = X
W0 = X
Figure 20. Serial-Load Power-Down\Power-Up Sequence
DIGITAL
OUT
V
DD
IOUT
IOUTB
V
DD
VINP/
VINN
V
DD
DIGITAL
IN
V
DD
a. DAC Output b. Comparator Output c. Comparator Input d. Digital Input
Figure 21. I/O Equivalent Circuits
Figure 20 shows a normal 40-bit serial word load sequence with
W33 always set to Logic 0 and W34 set to Logic 1 or Logic 0 to
control the power-down function. The logic states of the remain-
ing 38 bits are unimportant and are marked with an X, indicating
“don’t care” status. To power down, set W34 = 1. To power up
from a powered down state, change W34 to Logic 0. Wake-up
from power-down mode requires approximately 5
μ
s.
Note: The 40-bit input register of the AD9851 is fully program-
mable while in the power-down mode.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD9851/CGPCB | 制造商:Analog Devices 功能描述:NCO/DDS, CMOS 180MHZ DDS/DAC SYNTHESIZER - Bulk 制造商:Rochester Electronics LLC 功能描述:DDS CLOCK DRIVER - Bulk |
| AD9851/FSPCB | 制造商:Analog Devices 功能描述:Evaluation Board For NCO/DDS, CMOS 180MHZ DDS/DAC Synthesizer 制造商:Analog Devices 功能描述:NCO/DDS, CMOS 180MHZ DDS/DAC SYNTHESIZER - Bulk |
| AD9851BRS | 功能描述:IC DDS DAC W/COMP 180MHZ 28-SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 直接數字合成 (DDS) 系列:- 產品變化通告:Product Discontinuance 27/Oct/2011 標準包裝:2,500 系列:- 分辨率（位）:10 b 主 fclk:25MHz 調節字寬（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） 供應商設備封裝:16-TSSOP 包裝:帶卷 (TR) |
| AD9851BRSRL | 功能描述:IC DDS/DAC SYNTHESIZER 28-SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 直接數字合成 (DDS) 系列:- 產品變化通告:Product Discontinuance 27/Oct/2011 標準包裝:2,500 系列:- 分辨率（位）:10 b 主 fclk:25MHz 調節字寬（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） 供應商設備封裝:16-TSSOP 包裝:帶卷 (TR) |
| AD9851BRSZ | 功能描述:IC SYNTHESIZER DDS/DAC 28-SSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 直接數字合成 (DDS) 系列:- 產品變化通告:Product Discontinuance 27/Oct/2011 標準包裝:2,500 系列:- 分辨率（位）:10 b 主 fclk:25MHz 調節字寬（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） 供應商設備封裝:16-TSSOP 包裝:帶卷 (TR) |
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