PE3291EK PEREGRINE [Peregrine Semiconductor Corp.], PE3291EK Datasheet - Page 3

• Manufacturer Part Number: PE3291EK
• Manufacturer: PEREGRINE [Peregrine Semiconductor Corp.]

PE3291
Product Specification
PE3291 Description
The PE3291 is intended for such applications as
the local oscillator for the RF and first IF of dual-
conversion transceivers. The RF PLL (PLL1)
includes a 32/33 prescaler with a 1200 MHz
maximum frequency of operation, where the IF
PLL (PLL2) incorporates a 16/17 prescaler with a
550 MHz maximum frequency of operation. Using
an advanced fractional-N phase-locked loop
technique, the PE3291 can generate a stable,
very low phase-noise signal. The dual fractional
architecture allows fine resolution in both PLLs,
with no degradation in phase noise performance.
Data is transferred into the PE3291 via a three-
wire interface (Data, Clock, LE). Supply voltage
can range from 2.7 to 3.3 volts for V
0.8 to 3.3 volts for the FlexiPower supply. PE3291
features very low power consumption and is
available in a 20-lead TSSOP (JEDEC MO-153-
AC) package.
Figure 4. PE3291 Block Diagram
Document No. 70-0009-04 │ www.psemi.com
Clock
Data
f
f
LE
in
in
1
2
f
r
Amp.
Ref.
Prescaler
Prescaler
32/33
16/17
21-bit Serial Control
DD
and from
9-bit Reference
9-bit Reference
Interface
Divider
Divider
19-bit Fractional-N
18-bit Fractional-N
Main Divider
Main Divider
FlexiPower Operation
Each FlexiPower PLL prescaler can be supplied
its own dedicated supply voltage as low as 0.8
volts for substantial power savings. The maximum
frequency of operation scales with the FlexiPower
supply voltage. If voltages less than V
available, the FlexiPower supplies can be
internally generated, but the power savings will
not be as great as when using external
FlexiPower supplies.
Spurious Response
A critical parameter for synthesizer designs is
spurious output. Spurs occur at the integer
multiples of the step size away from center tone.
An important feature of fractional synthesizers is
their ability to reduce these spurious sidebands.
The PE3291 has a built-in method for reducing
these spurs, with no external components or
tuning required. In addition, this circuitry works
over the full commercial temperature range.
Detector
©2005 Peregrine Semiconductor Corp. All rights reserved.
Detector
Phase
Phase
Multiplexer
Fractional Spur
Fractional Spur
Compensation
Compensation
Charge
Charge
Pump
Pump
CP1
f
CP2
DD
o
LD
are not
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