|
KM公司的AK4710是從外接音頻DAC連接的單端或差分輸入的音頻子系數,集成了音量控制,增益范圍從-6dB 到+24dB.器件包括限幅電路,視頻濾波器,視頻開關和75歐姆線路驅動器.主要用在數字STB和藍光播放器.本文介紹了AK4710主要特性,典型連接圖和評估板AKD4710功能,方框圖以及電路圖和元件布局圖. The AK4710/11’audio block accepts either single-ended or differential input from an external audio DAC. It is very flexible, with integrated volume controls that range from -6dB to +24dB for gain control. The video block includes a clamp circuit, video filters, video switches and a 75-ohm video line driver, realizing simple and low cost system construction The AK4710/11 supports fast and slow video blanking, compatible with the European SCART standard, making the AK4710/11 ideal for a full spectrum of European digital AV products. The AK4710 is housed in a 32-pin QFN package, and the AK4711 is housed in a 36-pin QFN package. AK4710主要特性: Audio section THD+N: −92dB (@2Vrms) Dynamic Range: 96dB (@2Vrms, A-weighted) Full Differential or Single-ended input for Decoder DAC Stereo Output for TV SCART and CINCH (2Vrms) Ground-Referenced Output Eliminates DC-Blocking Capacitor and Mute Circuit Video section Integrated LPF: –40dB@27MHz 6dB Gain for Outputs 5ch 75ohm driver 4ch for SCART: CVBS/Y, R/C, G, B 1ch for CINCH: CVBS Y/Pb/Pr Option (to 6MHz) Low-power Standby SCART pin#16(Fast Blanking), pin#8(Slow Blanking) Output Control Power supply 3.3V+/−5% and 12V+/−5% Low Power Dissipation / Low Power Standby Mode Package 32pin QFN (0.4mm pitch) 
圖1.AK4710音頻部分框圖
圖2.AK4710視頻部分框圖
圖3.AK4710視頻消隱框圖
圖4.AK4710典型連接圖 評估板AKD4710 AKD4710 is an evaluation board for quickly evaluating the AK4710, Single SCART Driver.Evaluation requires audio/video analog analyzers/generators and a power supply. 評估板AKD4710功能: • RCA connectors for analog audio output • XLR connectors for analog audio input • RCA connectors for SD video input/output • USB connector for serial control interface
圖5.評估板AKD4710方框圖
圖5.評估板AKD4710電路圖(1)
圖6.評估板AKD4710電路圖(2)
圖7.評估板AKD4710電路圖(3)
圖8.評估板AKD4710電路圖(4)
圖9.評估板AKD4710元件布局圖 詳情請見: http://www.asahi-kasei.co.jp/akm/en/product/ak4710/ak4710_p03e.pdf 和 http://www.asahi-kasei.co.jp/akm/en/product/ak4710/akd4710-a0-02e.pdf |
