The MAX9705 is a 3rd-generation, ultra-low EMI, mono, Class D audio power amplifier that provides Class AB performance with Class D efficiency. It delivers 2.3W into a 4Ω load and offers efficiencies above 85%. The active emissions limiting (AEL) circuitry reduces EMI by controlling the output FET gate transitions under all possible transient output-voltage conditions. The zero dead time (ZDT) technology allows the output FETs to switch simultaneously without cross-conduction, maintaining efficiency and THD+N performance. The patented spread-spectrum modulation scheme eliminates the need for output filtering found in traditional Class D devices. These design concepts reduce component count and extend battery life. The MAX9705 offers two modulation schemes: fixed-frequency (FFM) mode and spread-spectrum (SSM) mode, which further reduces EMI-radiated emissions due to the modulation frequency. The MAX9705 oscillator can be synchronized to an external clock through the SYNC input, allowing the switching frequency to be externally defined. The SYNC input also enables cascading and frequency locking of multiple MAX9705s, minimizing interference due to clock intermodulation. The device utilizes a fully differential architecture, a full-bridged output, and comprehensive...
The MAX9705 is a third-generation, ultra-low EMI mono Class D audio power amplifier that delivers Class AB performance with Class D efficiency. It provides 2.3W into a 4Ω load and achieves efficiencies above 85%. The device features Active Emissions Limiting (AEL) circuitry to reduce electromagnetic interference and Zero Dead Time (ZDT) technology for high efficiency and low Total Harmonic Distortion plus Noise (THD+N). It utilizes a fully differential architecture with comprehensive click-and-pop suppression.
| Output Power (4Ω, 1% THD+N) | 2.3W |
|---|---|
| Efficiency | >85% |
| Supply Voltage Range | 2.5V to 5.5V |
| Quiescent Current | 5.4mA |
| Operating Temperature Range | -40°C to +85°C |
The device offers four gain settings: 6dB, 12dB, 15.6dB, and 20dB.
No, it is a filterless amplifier that passes FCC-Radiated Emissions Standards.
Yes, the oscillator can be synchronized to an external clock through the SYNC input.