参数资料
| 型号： | AD9851BRS |
| 厂商： | Analog Devices Inc |
| 文件页数： | 3/24页 |
| 文件大小： | 0K |
| 描述： | IC DDS DAC W/COMP 180MHZ 28-SSOP |
| 产品培训模块： | Direct Digital Synthesis Tutorial Series (1 of 7): Introduction Direct Digital Synthesizer Tutorial Series (7 of 7): DDS in Action Direct Digital Synthesis Tutorial Series (3 of 7): Angle to Amplitude Converter Direct Digital Synthesis Tutorial Series (6 of 7): SINC Envelope Correction Direct Digital Synthesis Tutorial Series (4 of 7): Digital-to-Analog Converter Direct Digital Synthesis Tutorial Series (2 of 7): The Accumulator |
| 标准包装： | 1 |
| 分辨率（位）： | 10 b |
| 主 fclk： | 180MHz |
| 调节字宽（位）： | 32 b |
| 电源电压： | 2.7 V ~ 5.25 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 管件 |
AD9851
–11–
REF
CLOCK
90
PHASE
DIFFERENCE
8-BIT DATA BUS
FQ UD
RESET
W CLK
AD9851
#2
IOUT
AD9851
#1
W CLK
FQ UD
RESET
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 reg-
ister 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 frequency and phase.
AD9851
IOUT
30MHz
CLOCK
BANDPASS
FILTER
50
FUNDAMENTAL
FCLK
IMAGE
FC – FO
IMAGE
FC + FO
AMPLITUDE
60 120
180
240
FREQUENCY – MHz
240
FREQUENCY – MHz
IMAGE
FC + FO
BANDPASS
FILTER
AMPLITUDE
6
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
The differential DAC output connection in Figure 9 enables
reduction of common-mode signals and allows 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
50
1:1 TRANSFORMER
i.e., MINI-CIRCUITS T1–1T
50
AD9851
DDS
21
20
Figure 9. Differential DAC Output Connection for
Reduction of Common-Mode Signals
The AD9851 RSET input is driven by an external DAC (Figure 10)
SET
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 in the AD9851 data sheet 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 engaged,
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
IOUT
RSET
+5V
21
20
12
9
4k
200
330
+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 RSET Input Being Driven by an External DAC
REV. D
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD9851BRSRL | 功能描述:IC DDS/DAC SYNTHESIZER 28-SSOP RoHS:否 类别:集成电路 (IC) >> 接口 - 直接数字合成 (DDS) 系列:- 产品变化通告:Product Discontinuance 27/Oct/2011 标准包装:2,500 系列:- 分辨率（位）:10 b 主 fclk:25MHz 调节字宽（位）:32 b 电源电压:2.97 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:带卷 (TR) |
| AD9851BRSZ | 功能描述:IC SYNTHESIZER DDS/DAC 28-SSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 直接数字合成 (DDS) 系列:- 产品变化通告:Product Discontinuance 27/Oct/2011 标准包装:2,500 系列:- 分辨率（位）:10 b 主 fclk:25MHz 调节字宽（位）:32 b 电源电压:2.97 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:带卷 (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 类别:集成电路 (IC) >> 接口 - 直接数字合成 (DDS) 系列:- 产品变化通告:Product Discontinuance 27/Oct/2011 标准包装:2,500 系列:- 分辨率（位）:10 b 主 fclk:25MHz 调节字宽（位）:32 b 电源电压:2.97 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:带卷 (TR) |
| AD9851CGPCB | 制造商:AD 制造商全称:Analog Devices 功能描述:CMOS 180 MHz DDS/DAC Synthesizer |
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