3239-11 データシートの表示（PDF） - Peregrine Semiconductor
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3239-11 Datasheet PDF : 12 Pages
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PE3239
Product Specification
Functional Description
The PE3239 consists of a prescaler, counters, a
phase detector, charge pump and control logic.
The dual modulus prescaler divides the VCO
frequency by either 10 or 11, depending on the
value of the modulus select. Counters “R” and “M”
divide the reference and prescaler output,
respectively, by integer values stored in a 20-bit
register. An additional counter (“A”) is used in
the modulus select logic.
Figure 6. Functional Block Diagram
The phase-frequency detector generates up and
down frequency control signals which direct the
charge pump operation. The control logic includes
a selectable chip interface. Data is written into the
internal registers via the three wire serial bus.
There are also various operational and test modes
and a lock detect output.
fr
R Counter
(6-bit)
fc
Sdata
Control
Pins
Control
Logic
R(5:0)
M(8:0)
A(3:0)
Modulus
Select
Fin
10/11
Fin
Prescaler
Phase
Detector
PD_U
Charge
PD_D Pump
CP
LD
Cext
M Counter
(9-bit)
fp
Document No. 70-0047-02 │ www.psemi.com
©2006 Peregrine Semiconductor Corp. All rights reserved.
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