- 您現在的位置：買賣IC網 > PDF目錄373969 > AD9851 (Analog Devices, Inc.) CMOS 180 MHz DDS/DAC Synthesizer PDF資料下載
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： | 7/23頁 |
| 文件大小： | 277K |
| 代理商： | AD9851 |
AD9851
–7–
REV. 0
REF
CLOCK
90
PHASE
DIFFERENCE
8-BIT DATA BUS
FQ UD
AD9851
RESET
W CLK
#2
IOUT
AD9851
FQ UD
RESET
W CLK
IOUT
RESET
FQ UD
RESET
FQ UD
W CLK #2
W CLK #1
MICROPROCESSOR
OR
MICROCONTROLLER
W CLK #2
W CLK #1
Figure 7. Application Showing Synchronization of Two
AD9851 DDSs to Form a Quadrature Oscillator
After a common RESET command is issued, separate W_CLKs
allow independent programming of each AD9851 40-bit input
register via the 8-bit data bus or serial input pin. A common
FQ_UD pulse is issued after programming is completed to
simultaneously engage both oscillators at their specified fre-
quency and phase.
AD9851
3
6
IOUT
30MHz
CLOCK
BANDPASS
FILTER
50
V
50
V
FUNDAMENTAL
F
CLK
IMAGE
F
– F
O
IMAGE
F
+ F
O
A
60
FREQUENCY – MHz
120
180
240
240
FREQUENCY – MHz
IMAGE
F
+ F
O
BANDPASS
FILTER
A
AMPLIFIER
240MHz
AD9851
SPECTRUM
FINAL OUTPUT
SPECTRUM
Figure 8. Deriving a High Frequency Output Signal from
the AD9851 by Using an “Alias” or Image Signal
Differential DAC output connection (Figure 9) for reduction of
common-mode signals and to allow highly reactive filters to be
driven without a filter input termination resistor (see above
single-ended example, Figure 8). A 6 dB power advantage is
obtained at the filter output as compared with the single-ended
example, since the filter need not be doubly terminated.
REFERENCE
CLOCK
FILTER
DIFFERENTIAL
TRANSFORMER-COUPLED
OUTPUT
21
50
1:1 TRANSFORMER
i.e., MINI-CIRCUITS T1–1T
50
V
AD9851
DDS
20
Figure 9. Differential DAC Output Connection for Reduc-
tion of Common-Mode Signals.
The AD9851 R
SET
input being driven by an external DAC
(Figure 10) to provide amplitude modulation or fixed, digital
amplitude control of the DAC output current. Full description
of this application is found as a “Technical Note” on the AD9851
web page (site address is www.Analog.com) under “Related
Information.” An Analog Devices application note for the
AD9850, AN-423, describes another method of amplitude
control using an enhancement-mode MOSFET that is equally
applicable to the AD9851.
NOTE: If the 6
×
REFCLK Multiplier of the AD9851 is en-
gaged, the 125 MHz clocking source shown in Figure 10 can be
reduced by a factor of six.
AD9851
DDS
DIFFERENTIAL
TRANSFORMER-COUPLED
OUTPUT
50
1:1 TRANSFORMER
50
V
IOUT
IOUT
R
SET
+5V
21
20
12
9
4k
V
200
V
330
V
+5V
20mA
MAX
10-BIT DAC
AD9731
+5V
–5V
125MHz
10 BITS
DATA
GENERATOR
e.g., DG-2020
COMPUTER
CONTROL
DATA
Figure 10. The AD9851 R
SET
Input Being Driven by an External DAC
相關PDF資料 |
PDF描述 |
|---|---|
| AD9852 | CMOS 300MHz Complete-DDS Synthesizer |
| AD9853 | Programmable Digital QPSK/16-QAM Modulator(可編程數字的四相移鍵控/16-正交幅度調制的調節器) |
| AD9854 | CMOS 300MHz Quadrature Complete-DDS |
| AD9858TLPCB | 1 GSPS Direct Digital Synthesizer |
| AD9858BSV | 1 GSPS Direct Digital Synthesizer |
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) |
發布緊急采購，3分鐘左右您將得到回復。