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单片电路音频芯片MM1407的应用

消耗积分:5 | 格式:rar | 大小:333 | 2009-01-23

王利祥

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This audio IC was developed for notebook PCs and allows major reduction of amp circuit board area. (To conform to PC98, includes built-in speaker drive amp, headphone amp, line amp. stereo/monaural switching,DC voltage control electronic volume, watchdog, logic control function.)

Applications
(1) Notebook PC audio control

Features
(1) Speaker amp: Stereo BTL output 0.7W (when VCC = 5.0V, RL = 8½)
(2) Electronic volume control (-60 ~ +20dB). THD = 0.5% (when POUT = 300mW, RL = 8½)
THD1 = 0.5% (when VOUT = 100mVrms, RL = 16½)
THD2 = 0.1% (when VOUT = 1VmVrms, RL = 10k½)
(4) Line amp: Mixes 4 inputs ( 2ch signals and outputs on 3 outputs ( 2ch. Stereo/monaural switching
possible on one line. THD = 0.1% (when VOUT = 1Vrms, RL = 10k½)
(5) Microphone amp: Switch pin selects 1 of 4 inputs
(6) Logic control: Speaker, headphone and line amp (including microphone amp and mix amp) logic
controllable. Current consumption 300μA during power save mode.

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