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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)載專業(yè)合成器 |
| 文件頁數(shù)： | 3/14頁 |
| 文件大?。?/td> | 169K |
| 代理商： | SP8855E |
3
SP8855E
PIN DESCRIPTION
PIN
DESCRIPTION
1,2,3,4,5,6,7,8,9,10,11,42,43,44
These pins are the data inputs used to set the RF divider ratio
(M.N+A). Open circuit = 1 (high) on these pins. Inputs are transparent into
the data buffers.
13, 14 (RF INPUT)
Balanced inputs to the RF pre-amplifier. For single ended operation the
signal is AC coupled into pin 13 with pin 14 AC decoupled to ground (or
vice -versa). Pins 13 and 14 are internally DC biased.
17 (LOCK DETECT INPUT)
A current sink into this pin is enabled when the lock detect circuit indicates
lock. Used to give an external indication of phase lock.
18 (C-LOCK DETECT)
A capacitor connected to this point determines the lock detect integrator time
constant and can be used to vary the sensitivity of the phase lock indicator.
19 (Rset)
An external resistor from Pin 19 to V
CC
sets the charge pump output current
20 (CP OUTPUT)
The phase detector output is a single ended charge pump sourcing or
sinking current to the inverting input of an external loop filter.
21 (CP REF)
Connected to the non-inverting input of the loop filter to set the optimum DC
bias.
22 (F
ref
/F
pd
ENABLE
Part of the data input bus. When this pin is logic HI the F
ref
and F
pd
outputs
are enabled. Open circuit = HI
23 (CONTROL DIRECTION)
This pin controls charge pump output direction. For Pin 23 HI the output
sinks current when F
> F
or when the RF phase leads Ref phase. For Pin
23 LO the relationship is reversed. (see table 2).
Changing the state of pin 23 reverses the pins on which Fref and Fpd output
occur. See pin 24 and Pin 25 below for details. Open circuit = HI.
24 = F
pd
if Pin 23 is HI
= F
ref
if Pin 23 is LO
RF divider output pulses. Fpd = RF input frequency /(M.N+A). Pulse width =
8 RF input cycles (1 cycle of the divide by 8 prescaler output).
25 = F
ref
if Pin 223 is HI
Reference divider output pulses. Fref = Reference input frequency/R. Pulse
width = high period of Ref input.
27 (Reference Oscillator Capacitor)
Leave open circuit if an external reference is used. See fig. 5 for typical
connection for use as an onboard crystal oscillator.
28 (Ref IN/XTAL)
This pin is the input buffer amplifier for an external reference signal. This
amplifier provides the active element if an onboard crystal oscillator is used.
29,30,31,32,33,34,35,36,37,38
These pins set the Reference divider ratio R. Open circuit = HI.
39 (Phase Detector ENABLE)
When this pin is HI the phase detector output is enable. Open circuit = HI.
40, 41 (PD Gain)
These pins set the charge pump current multiplication factor (see table 1). Open
circuit = HI.
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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: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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