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參數資料
| 型號： | SP8855E |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | 2.8GHz Parallel Load Professional Synthesiser |
| 中文描述： | 2.8GHz的并聯負載專業(yè)合成器 |
| 文件頁數： | 6/14頁 |
| 文件大?。?/td> | 169K |
| 代理商： | SP8855E |
6
SP8855E
DESCRIPTION
Prescaler and AM counter
The programmable divider chain is of AM counter
construction and therefore contains a dual modulus front end
prescaler, an A counter which controls the dual modulus ratio
and an M counter which performs the bulk multi-modulus
division. A programmable divider of this construction has a
division ratio of MN+A and a minimum integer steppable
division ratio of N(N-1), where N is the prescaler ratio.
Programming
The device is programmed by connecting the
programming pins to either V
or ground. The programming
inputs will go high if left open circuit but for best noise immunity
a wired connection to V
is preferable. The programming
inputs can be driven from TTL or CMOS logic levels if required.
Reference input
The reference source can be either driven from an external
sine or square wave source of up to 100MHz or a crystal can
be connected as shown in Fig. 5.
Phase Comparator and Charge pump
The SP8855E has a digital phase/frequency comparator
driving a charge pump with programmable current output.
The charge pump current level at the minimum gain setting
is approximately equal to the current fed into the R
se
input
pin 19 and can be increased by programming pins 40 and
41 according to Table 1 by up to 4 times.
Pin 40
Pin 41
Current Multiplication
Factor
0
0
1
1
0
1
0
1
1.0
1.5
2.5
4.0
Table 1
Fig. 5 Typical application diagram
APPLICATION USING
CRYSTAL REFERENCE
29
SP8855
27
28
33p
100p
10MHz
CRYSTAL
VCC
RF COUNTER
PROGRAMMING
1k
VCO
1n
7
8
9
10
11
12
13
14
15
16
17
1
1
2
2
2
2
2
2
2
2
2
6
5
4
3
2
1
4
4
4
4
4
39
38
37
36
35
34
33
32
31
30
* VALUES DEPEND
ON APPLICATION
2k2
1n
10n
*100n
1
μ
10n
1n
Ref in
Fpd Fref
*
-
+
OP27
ETC
100n
+30V
*
*
VCC
LOOP
FILTER
REFERENCE COUNTER
PROGRAMMING
+5V
相關PDF資料 |
PDF描述 |
|---|---|
| SP8858 | 1·5GHz Professional Synthesiser |
| SP8858IGHCAR | 1·5GHz Professional Synthesiser |
| SP8858IGHPAS | 1·5GHz Professional Synthesiser |
| SP8858MGHCAR | 1·5GHz Professional Synthesiser |
| SP8861 | 1.3GHz Low Power Single-Chip Frequency Synthesiser(1.3GHz低功耗單片頻率合成器) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| SP8855E/IG/HCAR | 制造商:Zarlink Semiconductor Inc 功能描述: |
| SP8858 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:1·5GHz Professional Synthesiser |
| SP8858IGHCAR | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:1·5GHz Professional Synthesiser |
| SP8858IGHPAS | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:1·5GHz Professional Synthesiser |
| SP8858MGHCAR | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:1·5GHz Professional Synthesiser |
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