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(kāi)關(guān)和75歐姆線(xiàn)路驅動(dòng)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