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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： | 6/23頁 |
| 文件大小： | 277K |
| 代理商： | AD9851 |
AD9851
–6–
REV. 0
Both 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 com-
parator 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
FILTER
TUNING
WORD
RF
FREQUENCY
OUT
Figure 3. Frequency/Phase-Agile Local Oscillator 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
I/Q MIXER
AND
LOW PASS
FILTER
I
Q
AD9059
DUAL
8-BIT ADC
8
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
GENERATOR
Figure 1. “Chip Rate” Clock Generator Application in a Spread Spectrum Receiver
MICROPROCESSOR
OR
MICROCONTROLLER
BUS
180MHz OR 30MHz
REFERENCE
CLOCK
8-BIT PARALLEL DATA,
OR 1-BIT
40 SERIAL DATA,
RESET, W CLK AND FQ UD
IOUT
100k
V
100k
V
470pF
100
V
IOUTB
R
SET
3.9k
V
CMOS
OUTPUTS
QOUT
QOUTB
LOW-PASS
FILTER
7TH ORDER ELLIPTICAL
70MHz LOW PASS
200
V
IMPEDANCE
200
V
VOLTAGE HERE = CENTER POINT
OF SINE WAVE (0.5V TYPICALLY)
USING PASSIVE "AVERAGING" CIRCUIT
0 TO 1V p-p
SINE WAVE
AD9851
200
V
Figure 2. Basic Clock Generator Configuration
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 = 2
/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. This applica-
tion is well documented in Analog Devices’ application Note
AN-543, and uses an “image” of the DDS output as illustrated
in Figure 8.
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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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