19104917473
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)
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