List of figures, An168 – Cirrus Logic AN168 User Manual
Page 3
AN168
AN168REV2
3
LIST OF FIGURES
Figure 1. Speaker Distortion.................................................................................................................... 4
Figure 2. Speaker Driver Distortion ......................................................................................................... 6
Figure 3. Generic Speaker Driver Configuration ..................................................................................... 7
Figure 4. Using RVol to Implement Volume Control................................................................................ 7
Figure 5. Three Common Sources of Acoustic Path Distortion ............................................................... 9
Figure 6. Acoustic Coupling Design Target............................................................................................. 9
Figure 7. Example Acoustic Coupling Frequency Response .................................................................. 9
Figure 8. Setting the Acoustic Coupling ................................................................................................ 10
Figure 9. Loop Gain with Network Sidetone.......................................................................................... 13
Figure 10. Loop Gain Diagram .............................................................................................................. 15
Figure 11. Acoustic Coupling Measurement Method ............................................................................ 16
Figure 12. Example Acoustic Coupling Frequency Response .............................................................. 17
Figure 13. Relative THD+N ................................................................................................................... 18
Figure 14. Coupling-Weighted THD+N.................................................................................................. 19
Figure 15. Acoustic ERLE Measurement -- Train the AEC ................................................................... 21
Figure 16. Acoustic ERLE Measurement -- Freeze AEC ...................................................................... 22
Figure 17. Acoustic ERLE Measurement -- Clear AEC ......................................................................... 22
Figure 18. Suggested CS6422 Layout .................................................................................................. 25
Figure 19. Speaker Driver Implementation............................................................................................ 26
Figure 20. CS6422 Reset and Configuration Timing............................................................................. 27
Figure 21. Example 4 kHz, 3-Pole Butterworth Low-Pass Filter ........................................................... 30
Figure 22. TDA 1519A Schematic......................................................................................................... 31
Figure 23. TDA 2003 Schematic ........................................................................................................... 32
Figure 24. TDA 1905 Schematic ........................................................................................................... 33
Figure 25. LM 1877 Schematic ............................................................................................................. 35
Figure 26. LM 4861 Schematic ............................................................................................................. 36
IMPORTANT NOTICE
Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information
is subject to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest
version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to
the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of
liability. No responsibility is assumed by Cirrus for the use of this information, including use of this information as the basis for manufacture or sale of any
items, or for infringement of patents or other rights of third parties. This document is the property of Cirrus and by furnishing this information, Cirrus
grants no license, express or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or other intellectual property rights.
Cirrus owns the copyrights associated with the information contained herein and gives consent for copies to be made of the information only for use
within your organization with respect to Cirrus integrated circuits or other products of Cirrus. This consent does not extend to other copying such as
copying for general distribution, advertising or promotional purposes, or for creating any work for resale.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR
SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS”). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED
OR WARRANTED FOR USE IN AIRCRAFT SYSTEMS, MILITARY APPLICATIONS, PRODUCTS SURGICALLY IMPLANTED INTO THE BODY,
AUTOMOTIVE SAFETY OR SECURITY DEVICES, LIFE SUPPORT PRODUCTS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF CIRRUS
PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER’S RISK AND CIRRUS DISCLAIMS AND MAKES NO
WARRANTY, EXPRESS, STATUTORY OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
PARTICULAR PURPOSE, WITH REGARD TO ANY CIRRUS PRODUCT THAT IS USED IN SUCH A MANNER. IF THE CUSTOMER OR
CUSTOMER’S CUSTOMER USES OR PERMITS THE USE OF CIRRUS PRODUCTS IN CRITICAL APPLICATIONS, CUSTOMER AGREES, BY
SUCH USE, TO FULLY INDEMNIFY CIRRUS, ITS OFFICERS, DIRECTORS, EMPLOYEES, DISTRIBUTORS AND OTHER AGENTS FROM ANY
AND ALL LIABILITY, INCLUDING ATTORNEYS’ FEES AND COSTS, THAT MAY RESULT FROM OR ARISE IN CONNECTION WITH THESE USES.
Cirrus Logic, Cirrus, and the Cirrus Logic logo designs are trademarks of Cirrus Logic, Inc. All other brand and product names in this document may be
trademarks or service marks of their respective owners.