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MAX9700 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX9700 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 19 page 1.2W, Low-EMI, Filterless, Class D Audio Amplifier _______________________________________________________________________________________ 9 spread over a bandwidth that increases with frequency. Above a few megahertz, the wideband spectrum looks like white noise for EMI purposes (Figure 3). External Clock Mode The SYNC input allows the MAX9700 to be synchro- nized to a system clock (allowing a fully synchronous system), or allocating 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 MAX9700. The period of the SYNC clock can be ran- domized, enabling the MAX9700 to be synchronized to another MAX9700 operating in SSM mode. Filterless Modulation/Common-Mode Idle The MAX9700 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 space and system cost. Conventional class D amplifiers output a 50% duty cycle square wave when no signal is present. With no filter, the square wave appears across Figure 1. MAX9700 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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Similar Description - MAX9700 |
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