Lowest-noise, class D/G amplifier offers low quiescent power

June 23, 2021 // By Jean-Pierre Joosting
Lowest-noise, class D/G amplifier offers low quiescent power
20-V digital input MAX98396 audio power amplifier provides speakers with an inaudible noise floor, which is 50 percent lower than other, similar amplifiers, enabling placement in near-silent environments.

Maxim Integrated Products has unveiled the MAX98396 Class D/G speaker amplifier with the industry’s lowest noise and lowest quiescent power consumption, which is nearly five times lower power than similar amplifiers. The 20-V digital input audio power amplifier offers 12.7 mW of quiescent power to meet and exceed the industry’s power compliance regulations, which support the always-on feature in portable Bluetooth and smart speakers. The MAX98396’s low 15.5 μVrms noise floor is 50-percent lower than the closest competitor, allowing speaker placement in near-silent locations.

The MAX98396 is the newest addition to Maxim’s portfolio of Class D/G amplifiers, offering the industry’s lowest power, lowest noise and highest thermal efficiency demanded by battery powered Bluetooth and always-on smart speakers. The industry-leading power efficiency allows the speaker to be driven higher and longer before reaching the thermal limit. As well, the MAX98396 is ultrasound ready with 45 kHz of bandwidth and a dedicated data path. This feature, combined with artificial intelligence (AI) software and ultrasound, enables touchless gesture sensing, presence detection and proximity sensing.

Key advantages include:

  • Ultra-low power: The MAX98396 offers 12.7 mW of quiescent power consumption at 12-V Power Vdd (PVDD), which is nearly five times lower than similar amplifiers. The low quiescent power meets and exceeds the industry’s standby power compliance regulations for always-on speakers.
  • Lowest noise floor: The MAX98396’s low 15.5 μVrms noise floor is 50-percent lower than the closest competitor, allowing speaker placement in near-silent locations.
  • Ultrasound ready: The MAX98396 offers an upgraded sampling frequency of up to 192 kHz and an ultrasound signal bypass path to prevent ultrasound signal attenuation by the audio processing.

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