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參數(shù)資料
| 型號(hào)： | SP8400KG |
| 廠商： | Zarlink Semiconductor Inc. |
| 英文描述： | Very Low Phase Noise Synthesiser Divider |
| 中文描述： | 極低的相位噪聲合成器分頻器 |
| 文件頁(yè)數(shù)： | 3/5頁(yè) |
| 文件大?。?/td> | 388K |
| 代理商： | SP8400KG |
3
SP8400
APPLICATIONS INFORMATION
Circuit description, synthesiser divider
The divider is based on a divide by 8/9 modulus
prescaler, and a 12 stage control counter. This gives minimum
fractional – N division ratio of 64 (56 for general division), and
a maximum division ratio of 4103. The inputs to the control
counter are TTL/CMOS compatible. There is a fixed offset of
8 between the number on the data lines and the actual division
ratio.
The output is one transition only per divide cycle. This
eliminates the problem of where to put the redundant edge
when the divider is used in a fractional–N system, and also
avoids the problem of how to define the output pulse width.
This means that the overall division ratio conventionally de-
fined in terms of the rate of edges of the same polarity is twice
the selected division ratio.
Fig.4 Test circuit
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SP8400
10nF
10nF
1nF
1nF
2x330R
1nF
RF
TTL/CMOS
MODULUS
CONTROL
TTL/CMOS
MODULUS
CONTROL
V
CC
50R
50R
SIGNAL
GENERATOR
220nF
OUTPUT
Equations for division
The M and A data inputs form a 12 bit number with A0
being the least significant bit and M8 being the most significant
bit.
Definition 1:
Division ratio – (input frequency to out
put edges, positive or negative).
= Number loaded + 8
Definition 2:
Division ratio – (input frequency to out
put frequency).
= (Number loaded + 8) x 2
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PDF描述 |
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| SP8400MPES | Very Low Phase Noise Synthesiser Divider |
| SP8400MPFP | Very Low Phase Noise Synthesiser Divider |
| SP8402KG | Very Low Phase Noise Divider by 2N |
| SP8402MP1T | Very Low Phase Noise Divider by 2N |
| SP8402MPES | Very Low Phase Noise Divider by 2N |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP8400KGMPES | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Very Low Phase Noise Synthesiser Divider |
| SP8400MPES | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Very Low Phase Noise Synthesiser Divider |
| SP8400MPFP | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Very Low Phase Noise Synthesiser Divider |
| SP8401 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Very Low Phase Noise 300MHz ±10/11 |
| SP8401/KG/MPES | 制造商:Rochester Electronics LLC 功能描述: 制造商:Zarlink Semiconductor Inc 功能描述: 制造商:ZARLINK 功能描述: |
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