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MAX98300ETA+ Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX98300ETA+ Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 14 page 8 ______________________________________________________________________________________ Mono 2.6W Class D Amplifier Detailed Description The MAX98300 features industry-leading quiescent cur- rent, low-power shutdown mode, comprehensive click- and-pop suppression, and excellent RF immunity. The device offers Class AB audio performance with Class D efficiency in a minimal board-space solution. The Class D amplifier features spread-spectrum modula- tion, edge-rate, and overshoot control circuitry that offers significant improvements to switch-mode amplifier radi- ated emissions. The MAX98300 amplifier features click-and-pop sup- pression that reduces audible transients on startup and shutdown. The amplifier includes thermal overload and short-circuit protection. Class D Speaker Amplifier The MAX98300 filterless Class D amplifier offers much higher efficiency than Class AB amplifiers. The high efficiency of a Class D amplifier is due to the switching operation of the output stage transistors. Any power loss associated with the Class D output stage is mostly due to the I2R loss of the MOSFET on-resistance and quiescent current overhead. 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 89% 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 MAX98300’s spread-spectrum modulator randomly varies the switching frequency by Q 10kHz around the center frequency (300kHz). Above 10MHz, the wideband spectrum looks like noise for EMI purposes (Figure 1). Speaker Current Limit If the output current of the speaker amplifier exceeds the current limit (2A typ), the MAX98300 disables the out- puts for approximately 130Fs. At the end of 130Fs, the outputs are re-enabled. If the fault condition still exists, the MAX98300 continues to disable and re-enable the outputs until the fault condition is removed. Selectable Gain The MAX98300 offers five programmable gain selections through a single gain input (GAIN). Figure 1. EMI with 60cm of Speaker Cable and No Output Filtering Table 1. Gain Control Configuration FREQUENCY (MHz) 900 800 700 600 500 400 300 200 100 0 10 20 30 40 50 -10 30 1000 EN55022B LIMIT GAIN PIN MAXIMUM GAIN (dB) Connect to PVDD 12 Connect to PVDD through 100kI ±5% 9 Not connected 6 Connect to PGND through 100kI ±5% 3 Connect to PGND 0 |
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