KM公司的AK4710是从外接音频DAC连接的单端或差分输入的音频子系数,集成了音量控制,增益范围从-6dB 到+24dB.器件包括限幅电路,视频滤波器,视频开关和75欧姆线路驱动器.主要用在数字STB和蓝光播放器.本文介绍了AK4710主要特性,典型连接图和评估板AKD4710功能,方框图以及电路图和元件布局图.
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)

图1.AK4710音频部分框图

图2.AK4710视频部分框图

图3.AK4710视频消隐框图

 图4.AK4710典型连接图

评估板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.

评估板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

图5.评估板AKD4710方框图

图5.评估板AKD4710电路图(1)

图6.评估板AKD4710电路图(2)

图7.评估板AKD4710电路图(3)

图8.评估板AKD4710电路图(4)

图9.评估板AKD4710元件布局图