AN22 DOC-26615-3

AN22 DOC-26615-3
Application Note
AN22
Migrating from PE9702 to PE97022
Introduction
Summary
A new generation of low phase noise frequency
synthesizers has been released to address the need
of the space application requirements for low phase
noise. Three new products – PE97022, PE97042
and PE97632, are based on the existing products –
PE9702, PE9704 and PE9763 respectively. Careful
planning and attention have been made during
design to minimize the effort and changes required
for the migration from the existing products to the
new products. There are trade-offs between design
constraint and extent of phase noise improvement.
The priority is always given first to produce a
solution with the lowest phase noise possible and
then with minimum effort for the migration. This
application note describes in detail the necessary
steps that are needed to migrate from an existing
design that uses PE9702 to PE97022 to achieve
improved phase noise.
 Details of low phase noise availability in new
Migrating From PE9702 to PE97022
The PE97022 is fully pin and drop-in compatible
with the PE9702. There is no PCB modification
necessary to obtain improved phase noise
performance with the new PE97022 parts. PE97022
can operate at 3.0V nominal VDD and benefit from
the lower phase noise but the phase noise can be
further improved by raising the VDD supply level to
3.3V. See Figure 1 for a comparison between the
typical phase noise levels for the two parts.
Table 1. PE9702 Operational Specifications
Symbol
Parameter/Condition
VDD
Supply voltage
IDD
Operational supply current;
VDD = 2.85–3.15V
Prescaler disabled
Prescaler enabled
N
Normalized phase noise
VDD = 2.85–3.15V
Min
Typ
2.85
The typical operational IDD for PE97022 is about 10
mA more than PE9702. The existing design needs
to be capable of sourcing the extra current without
lowering the voltage level on VDD pins of PE97022.
Please see Table 1 and Table 2 for a comparison of
operational specifications.
Table 2. PE97022 Operational Specifications
Max
Unit
Symbol
3.15
V
VDD
Supply voltage
IDD
Operational supply current;
VDD = 3.3V
Prescaler disabled
Prescaler enabled
N
Normalized phase noise
VDD = 3.3V
10
24
–210
PLL products
 Migration from PE9702 to PE97022
 PE97022 fully pin and drop-in compatible
with PE9702
 No PCB modification necessary
 Phase noise greatly improved by raising VDD
to 3.3V on PE97022
 Operational specification comparison chart
between PE9702 and PE97022
 Phase noise comparison graph between
PE9702 and PE97022
mA
mA
dBc/Hz
Document No. DOC-26615-3 │ www.e2v-us.com
©2008–2015 Peregrine Semiconductor Corp. All rights reserved.
Parameter/Condition
Min
Typ
2.85
–216
Max
Unit
3.45
V
14
41
mA
mA
dBc/Hz
For applications support, please visit www.e2v-us.com
Page 1 of 2
AN22
Application Note
Figure 1. Typical Phase Noise for PE97022 (Trace 1) and PE9702 (Trace 2)
Fvco = 1.92 GHz, Fcomp = 20 MHz, Loop Bandwidth = 50 kHz
Conclusion
This application has described the steps necessary to convert any existing design that uses PE9702 to the
newer, lower phase noise PE97022.
Sales Contact and Information
Contact Information:
e2v ~ http://www.e2v-us.com ~ [email protected]
Advance Information: The product is in a formative or design stage. The datasheet contains design target
specifications for product development. Specifications and features may change in any manner without notice.
Preliminary Specification: The datasheet contains preliminary data. Additional data may be added at a later
date. Peregrine reserves the right to change specifications at any time without notice in order to supply the best
possible product. Product Specification: The datasheet contains final data. In the event Peregrine decides to
change the specifications, Peregrine will notify customers of the intended changes by issuing a CNF (Customer
Notification Form).
For applications support, please visit www.e2v-us.com
Page 2 of 2
The information in this datasheet is believed to be reliable. However, Peregrine assumes no liability for the use
of this information. Use shall be entirely at the user’s own risk.
No patent rights or licenses to any circuits described in this datasheet are implied or granted to any third party.
Peregrine’s products are not designed or intended for use in devices or systems intended for surgical implant,
or in other applications intended to support or sustain life, or in any application in which the failure of the
Peregrine product could create a situation in which personal injury or death might occur. Peregrine assumes no
liability for damages, including consequential or incidental damages, arising out of the use of its products in
such applications.
The Peregrine name, logo and UltraCMOS are registered trademarks, and HaRP is a trademark of Peregrine
Semiconductor Corp. Peregrine products are protected under one or more of the following U.S. Patents:
http://patents.psemi.com. All other trademarks and logos are the property of their respective owners.
Document No. DOC-26615-3 │ UltraCMOS® RFIC Solutions
©2008–2015 Peregrine Semiconductor Corp. All rights reserved.
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