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參數(shù)資料
| 型號： | AD9851BRS |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | CMOS 180 MHz DDS/DAC Synthesizer |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO28 |
| 封裝： | ULTRA SMALL, MO-150AH, SSOP-28 |
| 文件頁數(shù)： | 7/23頁 |
| 文件大?。?/td> | 254K |
| 代理商： | AD9851BRS |
AD9851
–7–
REV. C
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
V
1:1 TRANSFORMER
i.e., MINI-CIRCUITS T1–1T
50
V
AD9851
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
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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(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) |
| 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(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) |
| AD9851BRSZ | 制造商:Analog Devices 功能描述:Direct Digital Synthesizer IC (DDS) |
| AD9851BRSZRL | 功能描述:IC SYNTHESR DDS/DAC 28SSOP TR 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) |
| AD9851CGPCB | 制造商:AD 制造商全稱:Analog Devices 功能描述:CMOS 180 MHz DDS/DAC Synthesizer |
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