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参数资料
| 型号： | AD9851BRSRL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 2/24页 |
| 文件大小： | 0K |
| 描述： | IC DDS/DAC SYNTHESIZER 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： | 1,500 |
| 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： | 带卷 (TR) |
AD9851
–10–
IOUT and IOUTB are equally loaded with 100 . Two 100 k
resistors sample each output and average the two voltages.The
result is filtered with the 470 pF capacitor and applied to one
comparator input as a dc switching threshold. The filtered DAC
sine wave output is applied to the other comparator input.The
comparator will toggle with nearly 50% duty cycle as the sine
wave alternately traverses the center point threshold.
AD9851
DDS
REFERENCE
CLOCK
IF FREQUENCY
IN
FILTER
TUNING
WORD
RF
FREQUENCY
OUT
for Frequency Mixing/Multiplying
FILTER
PHASE
COMPARATOR
DIVIDE-BY-N
LOOP
FILTER
VCO
AD9851
DDS
REFERENCE
CLOCK
TUNING
WORD
RF
FREQUENCY
OUT
Figure 4. Frequency/Phase-Agile Reference for PLL
PHASE
COMPARATOR
LOOP
FILTER
VCO
AD9851
DDS
REFERENCE
CLOCK
TUNING
WORD
RF
FREQUENCY
OUT
FILTER
REF CLK IN
PROGRAMMABLE
DIVIDE-BY-N FUNCTION
(WHERE N = 232/ TUNING WORD)
Figure 5. Digitally Programmable Divide-by-N
Function in PLL
AD9851
DDS
FM RF
OUTPUT
ADSP-2181
DSP
PROCESSOR
ADSP-2181
BUS
INPUT/
OUTPUT
DECODE
LOGIC
8-BIT
DATA
BUS
AD1847
STEREO
CODEC
L & R
AUDIO IN
REF
OSC
DAC
OUT
AD9851/FSPCB
EVALUATION
BOARD
EZ-KIT LITE
DSP
Figure 6. High Quality, All Digital RF Frequency
Modulation
High quality, all digital RF frequency modulation generation with
the ADSP-2181 DSP and the AD9851 DDS is well documented
in Analog Devices’ application note AN-543. It uses an image of
the DDS output as illustrated in Figure 8.
I/Q MIXER
AND
LOW-PASS
FILTER
I
Q
AD9059
DUAL
8-BIT ADC
8
DIGITAL
DEMODULATOR
ADC ENCODE
AGC
32
CHIP/SYMBOL/PN
RATE DATA
ADC CLOCK FREQUENCY
LOCKED TO
Tx CHIP/SYMBOL/PN RATE
180MHz
OR 30MHz
REFERENCE
CLOCK
Rx BASEBAND
DIGITAL DATA OUT
Rx
RF IN
VCA
AD9851
CLOCK
GENERATOR
Figure 1. Chip Rate Clock Generator Application in a Spread Spectrum Receiver
MICROPROCESSOR
OR
MICROCONTROLLER
DATA
BUS
180MHz OR 30MHz
REFERENCE
CLOCK
8-BIT PARALLEL DATA,
OR 1-BIT 40 SERIAL DATA,
RESET, W CLK AND FQ UD
IOUT
100k
470pF
100
IOUTB
RSET
3.9k
CMOS
OUTPUTS
QOUTB
QOUT
LOW-PASS
FILTER
7TH ORDER ELLIPTICAL
70MHz LOW PASS
200 IMPEDANCE
200
VOLTAGE HERE = CENTER POINT
OF SINE WAVE (0.5V TYPICALLY)
USING PASSIVE AVERAGING CIRCUIT
0 TO 1V p-p
SINE WAVE
AD9851
200
Figure 2. Basic Clock Generator Configuration
REV. D
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| AD9851FSPCB | 制造商:Analog Devices 功能描述:EVALUATION BOARD ((NS)) |
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