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AN214848 - CYW43XX: FM Receiver Trace Routing Guidelines | Cypress Semiconductor

AN214848 - CYW43XX: FM Receiver Trace Routing Guidelines

Last Updated: 
Jun 02, 2020
Version: 
*C
This is an Obsolete Application Note
The document AN214848 - CYW43XX: FM Receiver Trace Routing Guidelines has been marked as obsolete. The obsolete version of this application note is still available with the below description but may not be complete or valid any longer. If you have any questions or require support in regards to the below application note content, please click here and create a technical support case.

This document provides board trace-routing guidelines for the FM receiver RF trace that connects the CYW43XX to a headset connector. It is intended for design engineers doing CYW43XX-based board layouts. This document is specific to the trace routing of the FM receiver RF trace on the following devices:
■ CYW4324
■ CYW4334
■ CYW43341
■ CYW4335
For all other trace routing guidelines particular to a given device, refer to the schematic and layout guidelines for that device. To optimize FM receiver performance on a CYW43XX-based board and to minimize any negative effects of received FM signals on other board functions, the RF input trace to the FM receiver must be routed according to a specific set of layout guidelines. This document contains the layout guidelines, an example schematic that applies the guidelines, and a few layout examples showing routing practices to be avoided.

Note: Throughout the document, the FM receiver RF input is referred to as the FM RX input. For the CYW4334 and CYW4335, the FM RX input pin is labeled FM_RF.