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AKM 公司的AK4203是立體聲無電容線路放大器和視頻放大器,具有內置的電荷泵電路,采用單個3.3V電源,可得到2Vrms輸出,并具有極好的線性度.音頻放大器的THD+N為 -90dB, S/N為102dB,視頻放大器的S/N為75dB(typ),放大器增益為+6dB.本文介紹了AK4203主要特性,方框圖,典型連接圖,評估板AKD4203-A功能和方框圖,以及電路圖和元件布局圖. Stereo Cap-less LINE-Amp and Video-Amp The AK4203 is an audio stereo cap-less line driver with 1-channel video driver. It eliminates the need for large DC-blocking capacitors with a built-in Charge-pump circuit. The AK4203 achieves 2Vrms outputs with excellent linearity 2Vrms output by single 3.3V power supply. The AK4203 is available in small 16-pin TSSOP, saving the system space and cost. AK4203主要特性: Audio Line-Amp Differential Input Stereo Cap-less Amplifier (No DC-blocking capacitors required) Line-Out level: 2.0Vrms THD+N: -90dB S/N: 102dB Output gain: 6dB Low-pass Filter: fc= 130kHz Pop Noise Free Ground-referenced Output Video Amp 1ch Stereo Cap-less Amplifier (No DC-blocking capacitors required) Integrated Video Amplifier (+6dB) Input Level: 1.5Vpp (max) SN: 75dB(typ), Bandwidth: 100kHz ∼ 6MHz LPF: -0.5dB@ 6.75MHz (typ), -43dB@27MHz (typ) Video Mute Function Power Supply: 3.0V ~ 3.6V Ta: -20 ~ 85℃ Package: 16TSSOP 
圖1.AK4203 方框圖
圖2.AK4203 典型連接框圖 AK4203評估板AKD4203-A The AKD4203-A is an evaluation board for a fast evaluation of the AK4203, Evaluation requires audio/video analog analyzers/generators and a power supply. 評估板AKD4203-A功能: • RCA jacks for analog audio input/output • XLR jacks for analog audio input • RCA jacks for video input/output
圖3.評估板AKD4203-A方框圖
圖4.評估板AKD4203-A電路圖(1)
圖5.評估板AKD4203-A電路圖(2)
圖6.評估板AKD4203-A電路圖(3)
圖7.評估板AKD4203-A電路圖(4)
圖8.評估板AKD4203-A元件布局圖 詳情請見: 
ak4203_f00e[1].pdf
(237.83 KB)
akd4203-a0-01e[1].pdf
(1.15 MB)
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