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參數(shù)資料
| 型號： | ADF4212LBCP |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | XO, clock |
| 英文描述： | Dual Low Power PLL Frequency Synthesizer |
| 中文描述： | PLL FREQUENCY SYNTHESIZER, 2400 MHz, QCC20 |
| 封裝： | 4 X 4 MM, MO-220VGGD-1, LFCSP-20 |
| 文件頁數(shù)： | 18/20頁 |
| 文件大?。?/td> | 245K |
| 代理商： | ADF4212LBCP |
REV. 0
ADF4212L
–18–
Wideband PLL
Many of the wireless applications for synthesizers and VCOs in
PLLs are narrow-band in nature. These applications include the
various wireless standards like GSM, DSC1800, CDMA, or
WCDMA. In each of these cases, the total tuning range for the
local oscillator is less than 100 MHz. However, there are also
wideband applications where the local oscillator could have up
to an octave tuning range. For example, cable television tuners
have a total range of about 400 MHz. Figure 8 shows an appli-
cation where the ADF4212L is used to control and program the
Micronetics M3500-1324. The loop filter was designed for an
RF output of 2100 MHz, a loop bandwidth of 40 kHz, a PFD
frequency of 1 MHz, I
CP
of 10 mA (2.5 mA synthesizer I
CP
multiplied by the gain factor of 4), VCO K
D
of 80 MHz/V (sen-
sitivity of the M3500-1324 at an output of 2100 MHz) and a
phase margin of 45 degrees.
REF
IN
D
R
A
R
D
I
A
I
RF
IN
MUXOUT
R
SET
V
P
1
V
P
2
V
DD
2
V
DD
1
ADF4212L
SPI COMPATIBLE SERIAL BUS
CLK
DATA
LE
1000pF
1000pF
51
FREF
IN
V
DD
V
P
2.7k
LOCK
DETECT
100pF
51
CP
RF
AD820
20k
3.9nF
27nF
470
130pF
1k
20V
3k
V_TUNE
M3500-1324
GND
V
CC
OUT
100pF18
18
18
100pF
RF
OUT
DECOUPLING CAPACITORS ON V
DD
, V
P
OF THE ADF4212L, ON V
CC
OF THE AD820 AND ON
V
CC
OF THE M3500-2250 HAVE BEEN OMITTED FROM THE DIAGRAM TO AID CLARITY.
THE IF SECTION OF THE CIRCUIT HAS ALSO BEEN OMITTED TO SIMPLIFY THE SCHEMATIC.
12V
Figure 8. Wideband PLL Circuit
In narrow-band applications, there is generally a small variation
in output frequency (generally less than 10%) and also a small
variation in VCO sensitivity over the range (typically <10%).
However in wideband applications both of these parameters
have a much greater variation. Variations in these parameters will
change the loop bandwidth. This in turn can affect stability
and lock time. By changing the programmable I
CP
, it is possible
to get compensation for these varying loop conditions and ensure
that the loop is always operating close to optimal conditions.
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| ADF4212LBCPZ-RL | 功能描述:IC PLL FREQ SYNTHESIZER 20LFCSP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:- 標準包裝:1,000 系列:Precision Edge® 類型:時鐘/頻率合成器 PLL:無 輸入:CML，PECL 輸出:CML 電路數(shù):1 比率 - 輸入:輸出:2:1 差分 - 輸入:輸出:是/是 頻率 - 最大:10.7GHz 除法器/乘法器:無/無 電源電壓:2.375 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-VFQFN 裸露焊盤，16-MLF? 供應(yīng)商設(shè)備封裝:16-MLF?（3x3） 包裝:帶卷 (TR) 其它名稱:SY58052UMGTRSY58052UMGTR-ND |
| ADF4212LBCPZ-RL7 | 功能描述:IC PLL FREQ SYNTHESIZER 20LFCSP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:- 標準包裝:1,000 系列:Precision Edge® 類型:時鐘/頻率合成器 PLL:無 輸入:CML，PECL 輸出:CML 電路數(shù):1 比率 - 輸入:輸出:2:1 差分 - 輸入:輸出:是/是 頻率 - 最大:10.7GHz 除法器/乘法器:無/無 電源電壓:2.375 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-VFQFN 裸露焊盤，16-MLF? 供應(yīng)商設(shè)備封裝:16-MLF?（3x3） 包裝:帶卷 (TR) 其它名稱:SY58052UMGTRSY58052UMGTR-ND |
| ADF4212LBRU | 制造商:Analog Devices 功能描述:PLL Frequency Synthesizer Dual 20-Pin TSSOP |
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