The MAX9702 combines a highly efficient Class D speaker amplifier with a high-linearity Class AB headphone amplifier. This ensures maximum battery life in speaker mode and maximum performance in headphone mode. The MAX9702 delivers up to 1.1W per channel into an 8Ω load and 1.8W into a 4Ω load from a 5V power supply. Maxim's 2nd-generation, spread-spectrum modulation scheme renders the traditional Class D output filter unnecessary.
The MAX9702 speaker amplifier offers two modulation schemes: a fixed-frequency (FFM) mode and a spread-spectrum (SSM) mode that reduces EMI-radiated emissions. The MAX9702 speaker amplifier features a fully differential architecture, full-bridged (BTL) output, and comprehensive click-and-pop suppression. The MAX9702 speaker amplifier features high 75dB PSRR, low 0.07% THD+N, and SNR in excess of 97dB. Short-circuit and thermal-overload protection prevent the device from being damaged during a fault condition.
The headphone amplifier uses Maxim's DirectDrive® architecture that produces a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors, saving cost, board space, and component height. A high 80dB PSRR and low 0.02% THD+N ensures clean, low-distortion amplification of the audio signal.
An I²C interface sets the speaker and headphone gain, mono, stereo, and mute functions.
The MAX9702 is available in a 28-pin thin QFN-EP (5mm x 5mm x 0.8mm) package. The MAX9702 is specified over the extended -40°C to +85°C temperature range.
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