Maxim MAX97220差分输入耳机放大器解决方案

Maxim公司的MAX97220A/B是差分输入的线路/耳机放大器,5V电源时能以3VRMS驱动1K欧姆线路负载, 3.3V电源时能以2VRMS驱动600欧姆线路负载,工作电压2.5V-5.5V, DirectDrive输出,不需要隔直流电容,THD+N优于90dB,18位SNR性能达112dB,主要用于STB,蓝光和DVD播放器,LCD电视和音频设备.本文介绍了MAX97220主要特性, 功能方框图, MAX97220A评估板主要特性,电路图,材料清单和PCB元件布局图.

The MAX97220A/B is a differential input DirectDrive® line driver/headphone amplifier. This device is capable of driving line level loads with 3VRMS into 1kI with a 5V supply and 2VRMS into 600I loads from a 3.3V supply. A headphone load is capable of being driven with 125mW into 32I with a 5V supply. The IC is offered with an inter­nally fixed 6dB gain or an externally set gain through external resistors. The external gain setting nodes can also be used to configure filters for set-top box applica­tions. The IC has exceptional THD+N over the full audio bandwidth.
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