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CS35L41 データシート(PDF) 2 Page - Cirrus Logic

部品番号. CS35L41
部品情報  11 Volt Boosted Class D Audio Amplifier with DSP
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メーカー  CIRRUS [Cirrus Logic]
ホームページ  http://www.cirrus.com
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CS35L41 Datasheet(HTML) 2 Page - Cirrus Logic

   
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CS35L41 Boosted Class D Audio Amplifier with DSP
CS35L41 Package Size
and Footprint
CS35L41 Package Size and Footprint:
74% smaller
than nearest smart amplifier competitor
Space Saving Package
Enhanced Audio and Battery Performance
© 2018 Cirrus Logic, Inc. All rights reserved. Cirrus Logic, Cirrus, the Cirrus Logic logo design, and SoundClear are trademarks of Cirrus Logic, Inc. Other brand and product names in this document may be trademarks or service marks
of their respective owners.
Cirrus Logic, Inc.
800 West Sixth Street
Austin, Texas 78701
United States
T+1-512-851-4000
Sales Support
North America +1-800-888-5016
Asia Pacific +852 2376-0801
Japan +81-(3)-5782-8180
Europe/UK +44-(0)-131-272-7000
NOVEMBER 2018
cirrus.com
5.64 mm2
8.91 mm2
11.2 mm2
2.2884 mm
2.51 mm
3.2 mm
Figure 2 – Class G and Class H Supply Rail Voltage vs. Time
Vbat
3.6 V
Wasted Power
Cirrus Logic Class H
Boost Supply
Example Class G
Boost Supply
Figure 3 – Predictive Battery Management Performance
With Cirrus Logic Advanced
Battery Management System
With no battery management
Phone Battery Voltage
while playing stereo
audio through speakers
Vbat
3.6 V
Audio Enhancement
Cirrus Logic’s SoundClear Playback provides the ability to
fine tune the CS35L41 to the specific micro speaker being
used in the mobile system. Equalization, compression
and psychoacoustic enhancement algorithms improve
sound clarity and increase loudness. Playback filtering
compensates for the unique frequency response of the
speaker while eliminating pre-ringing found in conventional
linear phase filters as shown in Figure 1. These algorithms
are integrated into the on-chip DSP and prevent additional
workloads from being placed on the application processor.
Battery Management
The CS35L41 preserves battery life using an advanced
battery management system in addition to its Class H
boost and extremely low quiescent current. As illustrated
in Figure 2, the Class H DC-DC converter boosts the
supply while maintaining higher efficiency than the Class
G boost regulators commonly used in other smart
amplifiers. The battery management system predictively
adapts to changing audio, speaker and battery conditions
by intelligently regulating battery current to protect the
amplifier from drawing high currents that can cause a
system brownout if managed incorrectly. Figure 3 shows
that by predictively managing the demand on the battery,
the amplifier is able to maximize loudness and audio quality
while minimizing the power impact to the mobile device.
Conventional
Linear Phase Filter
Pre-ringing of a
Conventional Linear
Phase Filter
Playback Filter
Response
Figure 1 – Playback Filtering


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