PE3240EK PEREGRINE [Peregrine Semiconductor Corp.], PE3240EK Datasheet - Page 7

• Manufacturer Part Number: PE3240EK
• Manufacturer: PEREGRINE [Peregrine Semiconductor Corp.]

PE3240
Product Specification
Functional Description
The PE3240 consists of a prescaler, counters, a
phase detector 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.
additional counter (“A”) is used in the modulus
select logic.
Figure 6. Functional Block Diagram
Document No. 70-0034-02 │ www.psemi.com
Control
Sdata
Pins
F
F
in
in
f
r
Control
Logic
Prescaler
Modulus
Select
10/11
R(5:0)
M(8:0)
A(3:0)
An
M Counter
R Counter
(6-bit)
(9-bit)
The phase-frequency detector generates up and
down frequency control signals. 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.
f
f
c
p
Detector
Phase
©2006 Peregrine Semiconductor Corp. All rights reserved.
PD_U
PD_D
2 kΩ
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