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MAX9705CEBC+T Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX9705CEBC+T Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 20 page 2.3W, Ultra-Low-EMI, Filterless, Class D Audio Amplifier 10 ______________________________________________________________________________________ improving EMI emissions by 5dB. Proprietary techniques ensure that the cycle-to-cycle variation of the switching period does not degrade audio reproduction or efficiency (see the Typical Operating Characteristics). Select SSM mode by setting SYNC = VDD. In SSM mode, the switch- ing frequency varies randomly by ±120kHz around the center frequency (1.22MHz). The modulation scheme remains the same, but the period of the sawtooth wave- form changes from cycle to cycle (Figure 2). Instead of a large amount of spectral energy present at multiples of the switching frequency, the energy is now spread over a bandwidth that increases with frequency. Above a few megahertz, the wideband spectrum looks like white noise for EMI purposes (see the EMI Spectrum Diagram). External Clock Mode The SYNC input allows the MAX9705 to be synchronized to a system clock moving the spectral components of the switching harmonics to insensitive frequency bands. Applying an external TTL clock of 800kHz to 2MHz to SYNC synchronizes the switching frequency of the MAX9705. The period of the SYNC clock can be ran- domized, enabling the MAX9705 to be synchronized to another MAX9705 operating in SSM mode. Filterless Modulation/Common-Mode Idle The MAX9705 uses Maxim’s unique, patented modula- tion scheme that eliminates the LC filter required by traditional Class D amplifiers, improving efficiency, reducing component count, and conserving board Figure 1. MAX9705 Outputs with an Input Signal Applied OUT+ OUT- VIN- VIN+ VOUT+ - VOUT- tON(MIN) tSW SYNC INPUT MODE GND FFM with fS = 1100kHz FLOAT FFM with fS = 1450kHz VDD SSM with fS = 1220kHz ±120kHz Clocked FFM with fS = external clock frequency Table 1. Operating Modes |
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