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參數(shù)資料
| 型號(hào)： | 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(lián)負(fù)載專(zhuān)業(yè)合成器 |
| 文件頁(yè)數(shù)： | 7/14頁(yè) |
| 文件大?。?/td> | 169K |
| 代理商： | SP8855E |
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7
SP8855E
Pin 19 current
.
V
CC
- 1.6V
R
set
Phase detector gain =
I
pin 19
(mA) X multiplication factor
2
π
mA/radian
To allow for control direction changes introduced by the
design of the PLL, pin 23 can be programmed to reverse the
control direction of the loop by transposing the F
pd
and F
ref
connections. In order that any external phase detector will also
be reversed by this function, the F
pd
and F
ref
outputs are also
interchanged as shown in Table 2.
Output for RF Phase Lag
Control direction pin 23
1
0
pin 20
Current Source
Current Sink
Table 2
The Fpd and Fref signals to the phase detector are available
on pin 24 and 25 and may be used to monitor the frequency
input to the phase detector or used in conjunction with an
external phase detector. When the Fpd/Fref outputs are to be
used at high frequencies, an external pull down resistor of
minimum value 330
may be used connected to ground to
reduce the fall time of the output pulse.
The charge pump connections to the loop amplifier consist
of the charge pump output and the charge pump reference.
The matching of the charge pump up and down currents will
only be maintained if the charge pumps output is held at a
voltage equal to the charge pump reference using an
operational amplifier to produce a virtual earth condition at pin
20.
The lock detect circuit can drive an LED to give visual
indication of phase lock or provide an indication to the control
system if a pull-up resistor is used in place of the LED. A small
capacitor connected from the C-lock detector pin to ground
may be used to delay lock detect indication and remove
glitches produced by momentary phase coincidence during
lock up. The phase detector can be disabled by pulling pin 39
to logic low.
Fig. 6 Programming data format
29
30
31
32
33
34
35
36
37
38
PIN
29
28
27
26
25
24
23
22
21
20
TEN BIT REFERENCE COUNTER
REFERENCE DIVIDER PROGRAMMING PIN ALLOCATION
29
28
27
26
25
24
23
22
21
20
40 41 42 43 44 1 2 3 4 5 6 7 8 9 10 11 PIN
213 212 211 210
PHASE
DETECTOR
GAIN
CONTROL
see Table 1
M COUNTER
3 BIT A
COUNTER
REFERENCE DIVIDER PROGRAMMING PIN ALLOCATION
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)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(chēng):Mitel Networks Corporation 功能描述:1·5GHz Professional Synthesiser |
| SP8858IGHCAR | 制造商:MITEL 制造商全稱(chēng):Mitel Networks Corporation 功能描述:1·5GHz Professional Synthesiser |
| SP8858IGHPAS | 制造商:MITEL 制造商全稱(chēng):Mitel Networks Corporation 功能描述:1·5GHz Professional Synthesiser |
| SP8858MGHCAR | 制造商:MITEL 制造商全稱(chēng):Mitel Networks Corporation 功能描述:1·5GHz Professional Synthesiser |
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