PE3340
Advance Information
Functional Description
The PE3340 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. An additional counter
(“A”) is used in the modulus select logic.
Figure 3. Functional Block Diagram
f
r
R Counter
(6-bit)
f
c
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.
Sdata
Control
Pins
R(5:0)
Control
Logic
M(8:0)
A(3:0)
Phase
Detector
PD_U
PD_D
LD
Cext
2 kΩ
Modulus
Select
F
in
F
in
10/11
Prescaler
M Counter
(9-bit)
f
p
Copyright
©
Peregrine Semiconductor Corp. 2004
File No. 70/0040~02A
|
UTSi
®
CMOS RFIC SOLUTIONS
Page 6 of 12
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