Objective: Provide a better understanding of coupling
capacitors and how to eliminate them from an audio
applications.
Length: 90 minutes
Published Date: Jul 30,
04
Step(s) to complete
- View online seminar
- Complete the suggested assignments
- Complete the online test
Online Seminar: High-Performance
Audio Amplifiers for Portable Applications
 About the
Instructor: Kevin Hoskins has been a Staff
Applications engineer since 1984. He wields his soldering iron
at National Semiconductor Corporation's Audio Products Group
in Santa Clara, California. He has also performed application
duties with the Data Acquisition Products Group at National
Semiconductor Corporation also in Santa Clara, California. |
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Reading
Assignment:
For a better understanding of coupling
capacitors and their usage, read the application
section for the LM4910.
Additional Resources:
- Review online seminar presentation. (pdf 1.6MB)
- For additional information, consult the Knowledge
Base using the following key words:
- BTL
- Headphone
Amplifiers
- LLP
Research
Assignment:
- Traditional stereo headphone amplifiers use
coupling capacitors between their outputs and
the speakers. Together, the value of the
coupling capacitor and the speaker's resistance
creates the cutoff frequency of a high pass
filter. Refer to the seminar to determine
the following:
- If RL=24 Ohms and the desired
frequency response extends to 30Hz, what is the
value of Ccoupling? (Round to nearest
µF)
- RL=8 Ohms and the frequency
response extends to 30Hz, what is the value of
Ccoupling? (Round to nearest µF)
- The LM4867 is available in National
Semiconductor Corporation's 24 pin leadless lead
frame package (LLP). When comparing this
package to the traditional solution's 24 pin
TSSOP, how much board space is saved by using
the 24-pin LLP? (in
percent)
- The LM4910 eliminates output coupling
capacitors. Using the online seminar
describe how is this achieved? Why does
this work?
CHECK
ALL ANSWERS
HERE |
