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.