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ADF4153ABRUZ-RL7

更新时间： 2022-02-26 11:30:01
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
24页 358K
描述
Fractional-N Frequency Synthesizer

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中文翻译

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ADF4153ABRUZ-RL7 数据手册

 浏览型号ADF4153ABRUZ-RL7的Datasheet PDF文件第18页浏览型号ADF4153ABRUZ-RL7的Datasheet PDF文件第19页浏览型号ADF4153ABRUZ-RL7的Datasheet PDF文件第20页浏览型号ADF4153ABRUZ-RL7的Datasheet PDF文件第22页浏览型号ADF4153ABRUZ-RL7的Datasheet PDF文件第23页浏览型号ADF4153ABRUZ-RL7的Datasheet PDF文件第24页 
Data Sheet  
ADF4153A  
APPLICATIONS INFORMATION  
LOCAL OSCILLATOR FOR A GSM BASE STATION  
TRANSMITTER  
The charge pump current is ICP = 5 mA. ADIsimPLL is used to  
calculate the loop filter. It is designed for a loop bandwidth of  
20 kHz and a phase margin of 45 degrees.  
Figure 25 shows the ADF4153A being used with a VCO to  
produce the local oscillator (LO) for a GSM base station  
transmitter.  
The loop filter output drives the VCO, which in turn is fed back  
to the RF input of the PLL synthesizer. It also drives the RF output  
terminal. A T-circuit configuration provides 50 Ω matching  
between the VCO output, the RF output, and the RFIN terminal  
of the synthesizer.  
The reference input signal is applied to the circuit at REFIN and,  
in this case, is terminated in 50 Ω. A 25 MHz reference is used,  
which is fed directly to the PFD. To achieve 200 kHz channel  
spacing, a modulus of 125 is necessary. Note that with a modulus  
of 125, which is not divisible by 2, 3, or 6, subfractional spurs are  
avoided. See the Spur Mechanisms section for more information.  
In a PLL system, it is important to know when the loop is in  
lock. This is achieved by using the MUXOUT signal from the  
synthesizer. The MUXOUT pin can be programmed to monitor  
various internal signals in the synthesizer. One of these is the  
lock detect signal.  
The charge pump output of the ADF4153A drives the loop  
filter.  
V
V
DD  
P
10pF  
100nF  
10µF  
100nF  
6
100nF  
10µF  
RF  
OUT  
100pF  
7
16 17  
18  
14  
V
P
18Ω  
V
CC  
100pF  
18Ω  
10  
160Ω  
20  
2
11  
CP  
SV  
VCO190-902T  
DD  
18Ω  
1000pF  
1000pF  
8.2nF  
8
22nF  
82Ω  
270nF  
REF  
FREF  
IN  
IN  
51Ω  
ADF4153A  
15  
LOCK  
DETECT  
MUXOUT  
CLK  
DATA  
LE  
100pF  
5
4
RF  
A
IN  
R
SET  
51Ω  
4.7kΩ  
RF  
B
IN  
100pF  
1
2
3
9
10  
DECOUPLING CAPACITORS SHOULD BE PLACED  
AS CLOSE AS POSSIBLE TO THE PINS.  
Figure 25. Local Oscillator for a GSM Base Station Transmitter  
Rev. A | Page 21 of 24  
 
 
 
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