MAX97001EVKIT+ Maxim Integrated Products, MAX97001EVKIT+ Datasheet - Page 20

• Manufacturer Part Number: MAX97001EVKIT+
• Description: KIT EVALUATION FOR MAX97001
• Manufacturer: Maxim Integrated Products

Specifications of MAX97001EVKIT+

• 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: MAX97001

Audio Subsystem with Mono Class D Speaker
and Class H Headphone Amplifiers
Traditional Class D amplifiers require the use of exter-
nal LC filters or shielding in order to meet EN55022B
electromagnetic-interference (EMI) regulation stan-
dards. Maxim’s active emissions limiting edge-rate
control circuitry and spread-spectrum modulation
reduces EMI emissions, while maintaining up to 87%
efficiency.
Figure 4. EMI with 15cm of Speaker Cable
20
Maxim’s
Ultra-Low EMI Filterless Output Stage
spread-spectrum
-10
-10
40
30
20
10
40
30
20
10
0
0
300
30
350
60
400
80
450
modulation
100
500
120
550
140
FREQUENCY (MHz)
FREQUENCY (MHz)
600
160
650
mode flattens wideband spectral components, while
proprietary techniques ensure that the cycle-to-cycle
variation of the switching period does not degrade audio
reproduction or efficiency. The MAX97001’s spread-
spectrum modulator randomly varies the switching
frequency by Q20kHz around the center frequency
(250kHz). Above 10MHz, the wideband spectrum looks
like noise for EMI purposes (see Figure 4).
180
700
200
750
220
800
240
850
260
900
280
950
1000
300