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MAX97000 Datasheet(PDF) 20 Page - Maxim Integrated Products

Part No. MAX97000
Description  Audio Subsystem with Mono Class D Speaker and Class H Headphone Amplifier
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX97000 Datasheet(HTML) 20 Page - Maxim Integrated Products

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Audio Subsystem with Mono Class D
Speaker and Class H Headphone Amplifier
20
Figure 4. EMI with 15cm of Speaker Cable
Ultra-Low EMI Filterless Output Stage
Traditional Class D amplifiers require the use of external
LC filters or shielding to meet EN55022B electromag-
netic-interference (EMI) regulation standards. Maxim’s
patented active emissions limiting edge-rate control
circuitry and spread-spectrum modulation reduces EMI
emissions, while maintaining up to 87% efficiency.
Maxim’s patented spread-spectrum modulation mode
flattens wideband spectral components, while propri-
etary techniques ensure that the cycle-to-cycle variation
of the switching period does not degrade audio repro-
duction or efficiency. The MAX97000’s spread-spectrum
modulator randomly varies the switching frequency by
Q
20kHz around the center frequency (250kHz). Above
10MHz, the wideband spectrum looks like noise for EMI
purposes (see Figure 4).
FREQUENCY (MHz)
280
260
240
220
200
180
160
140
120
100
80
60
0
10
20
30
40
-10
30
300
FREQUENCY (MHz)
950
900
850
800
750
700
650
600
550
500
450
400
0
10
20
30
40
-10
300
350
1000


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