MAX97000EVKIT+ Maxim Integrated Products, MAX97000EVKIT+ Datasheet - Page 20

• Manufacturer Part Number: MAX97000EVKIT+
• Description: KIT EVALUATION FOR MAX97000
• Manufacturer: Maxim Integrated Products

Specifications of MAX97000EVKIT+

• Description/function: Audio Amplifiers
• Operating Supply Voltage: 2.7 V to 5.5 V
• Product: Audio Development Tools
• Supply Current: 1 A
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: MAX97000

Audio Subsystem with Mono Class D
Speaker and Class H Headphone Amplifier
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Traditional Class D amplifiers require the use of external
LC filters or shielding to meet EN55022B electromag-
netic-interference (EMI) regulation standards. Maxim’s
active emissions limiting edge-rate control circuitry and
spread-spectrum modulation reduces EMI emissions,
while maintaining up to 87% efficiency. Maxim’s spread-
spectrum modulation mode flattens wideband spectral
Figure 4. EMI with 15cm of Speaker Cable
Ultra-Low EMI Filterless Output Stage
-10
-10
40
30
20
10
40
30
20
10
0
0
300
30
350
60
400
80
450
100
500
120
550
140
FREQUENCY (MHz)
FREQUENCY (MHz)
600
160
650
components, while proprietary techniques ensure that
the cycle-to-cycle variation of the switching period
does not degrade audio reproduction or efficiency.
The MAX97000’s spread-spectrum modulator randomly
varies the switching frequency by Q20kHz around the
center frequency (250kHz). Above 10MHz, the wide-
band spectrum looks like noise for EMI purposes (see
Figure 4).
180
700
200
750
220
800
240
850
260
900
280
950
1000
300