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.
..
