MAX9875 有低RF干扰敏感度的单声道音频子系统，带有D

MAX9875 具有低RF干扰敏感度的单声道音频子系统，带有DirectDrive耳机放大器

数据资料

The MAX9875 combines a high-efficiency Class D audio power amplifier with a stereo Class AB capacitorless DirectDrive® headphone amplifier. Maxim’s 3rd generation, filterless Class D amplifier with active emissions limiting technology provides Class AB performance with Class D efficiency.

The MAX9875 delivers up to 725mW from a 3.7V supply into an 8&937; load with 87% efficiency to extend battery life. The filterless modulation scheme combined with active emissions limiting circuitry and spread-spectrum modulation greatly reduces EMI while eliminating the need for output filtering used in traditional Class D devices.

The stereo Class AB headphone amplifier in the MAX9875 uses Maxim’s patented DirectDrive architecture, that produces a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors, saving cost, space, and component height.

The device utilizes a user-defined input architecture, three preamplifier gain settings, an input mixer, volume control, comprehensive click-and-pop suppression, and I²C control.

The MAX9875 is available in a thermally efficient, space-saving 20-bump WLP package.

关键特性

Low Emissions, Filterless Class D Amplifier
	Achieves Better than 10dB Margin Under EN55022 Class B Limits
	Low RF Susceptibility Design Rejects TDMA Noise from GSM Radios
	Input Mixer with User-Defined Input Mode
	725mW Speaker Output (RSPK = 8Ω, PVDD = 3.7V)
	53mW Headphone Output (RHP = 16Ω, VDD = 3.7V)
	Low 0.05% THD+N at 1kHz (Class D Power Amplifier)
	Low 0.016% THD+N at 1kHz (Headphone Amplifier)
	87% Efficiency (RSPK = 8Ω, POUT = 750mW)
	High Speaker Amplifier PSRR (72dB at 217Hz)
	High Headphone Amplifier PSRR (84dB at 217Hz)
	I2C Control
	Hardware and Software Shutdown Mode
	Click-and-Pop Suppression
	Current-Limit and Thermal Protection
	Available in a Space-Saving, 2.5mm x 2.0mm WLP Package

应用/使用

蜂窝电话
便携式多媒体播放器
 

MAX9875 pdf datasheet (Low RF Susceptibility Mono Audio Subsystem)