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MC12210D Fiches technique(PDF) 6 Page - Motorola, Inc

No de pièce MC12210D
Description  SERIAL INPUT PLL FREQUENCY SYNTHESIZER
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Fabricant  MOTOROLA [Motorola, Inc]
Site Internet  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MC12210D Fiches technique(HTML) 6 Page - Motorola, Inc

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MC12210
6
MOTOROLA RF/IF DEVICE DATA
PHASE CHARACTERISTICS/VCO CHARACTERISTICS
The phase comparator in the MC12210 is a high speed digital phase frequency detector circuit. The circuit determines the “lead”
or “lag” phase relationship and time difference between the leading edges of the VCO (fp) signal and the reference (fr) input.
Since these edges occur only once per cycle, the detector has a range of
±2π radians. The phase comparator outputs are
standard CMOS rail–to–rail levels (VP to GND for φP and VCC to GND for φR), designed for up to 20MHz operation into a 15pF
load. These phase comparator outputs can be used along with an external charge pump to enhance the PLL characteristics.
The operation of the phase comparator is shown in Figures 3 and 5. The phase characteristics of the phase comparator are
controlled by the FC pin. The polarity of the phase comparator outputs,
φR and φP, as well as the charge pump output Do can be
reversed by switching the FC pin.
Figure 3. Phase/Frequency Detector, Internal Charge Pump and Lock Detect Waveforms
fr
fp
LD
Do (FC = H)
φR (FC = H)
φP (FC = H)
Do (FC = L)
φR (FC = L)
φP (FC = L)
H
L
H
L
H
L
Source
Sink
H
L
H
L
Source
Sink
H
L
H
L
Z
Z
NOTES: Do and BISW are current outputs.
Phase difference detection range: –2
π to +2π
Spike difference depends on charge pump characteristics. Also, the spike is output in order to diminish dead band.
When fr > fp or fr < fp, spike might not appear depending upon charge pump characteristics.
BISW (LE = H or Open)
BISW (LE = H or Open)
Internal Charge Pump Gain
[
Isource ) Isink
4
p
+
4mA
4
p


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