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ML12179-5P Fiches technique(PDF) 3 Page - LANSDALE Semiconductor Inc.

No de pièce ML12179-5P
Description  500-2800 MHz Single Channel Frequency Synthesizer
Download  11 Pages
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Fabricant  LANSDALE [LANSDALE Semiconductor Inc.]
Site Internet  http://www.lansdale.com
Logo LANSDALE - LANSDALE Semiconductor Inc.

ML12179-5P Fiches technique(HTML) 3 Page - LANSDALE Semiconductor Inc.

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Issue A
LANSDALE Semiconductor, Inc.
ML12179
Figure 2. Phase/Frequency Detector and Charge Pump Waveforms
fr
(OSCin)
H
L
fv
(Fin ÷256)
H
L
PDout
Sourcing Current Pulse
Sinking Current Pulse
Z
H = High voltage level; L = Low voltage level; Z = High impedance
NOTES: Phase difference detection range: ∼ –2π to 2π
Kp–Charge Pump Gain
|Isource|
|Isink|
++
==
|2.2|
|–2.2|
1.1 mA
πradian
Figure 1. ML12179 Expanded Block Diagram
Crystal
Oscillator
Prescaler
÷256
Phase/Frequency
Detector
Charge
Pump
VCC
OSCin
OSCout
2
1
8
4
C1
C2
VCO
+5.0 V
fr
fv
VP 7
+5.0 V
6
To Loop Filter
GND
GNDP
5
3
NOTE: External 50 kΩ resistor
across Pins 1 and 8 is necessary in
either crystal or driven mode.
1000 pF
Fin
PDout
PHASE CHARACTERISTICS
The phase comparator in the ML12179 is a high speed digital
phase/frequency detector circuit. The circuit determines the “lead”
or “lag” phase relationship and time difference between the lead-
ing edges of the VCO (fv) signal and the reference (fr) input. The
detector can cover a range of ±2
π radian of fv/fr phase difference.
The operation of the charge pump output is shown in Figure 2.
fr lags fv in phase OR fv>fr in frequency
When the phase of fr lags that of fv or the frequency of fv is
greater than fr, the Do output will sink current. The pulse width
will be determined by the time difference between the two rising
edges.
fr leads fv in phase OR fv<fr in frequency
When the phase of fr leads that of fv or the frequency of fv is
less than fr, the Do output will source current. The pulse width
will be determined by the time difference between the two rising
edges.
fr = fv in phase and frequency
When the phase and frequency of fr and fv are equal, the charge
pump will be in a quiet state, except for current spikes when sig-
nals are in phase. This situation indicates that the loop is in lock
and the phase comparator will maintain the loop in its locked
state.


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