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AKM公司的AK4627是高性能多路24位音頻CODEC,具有四路ADC和六路DAC. 四路ADC有64x過取樣,取樣速率高達96kHz,S/(N+D)為92dB,動態范圍單端為102dB,差分為103dB; 六路DAC有128x過取樣,取樣速率高達192kHz,24位8倍數字濾波器,S/(N+D)為90dB,動態范圍為106dB,主要用在家庭影院和汽車音頻設備等各種音頻設備.本文介紹了AK4627主要特性,方框圖, 典型應用電路圖和評估板AKD4627-A主要功能,電路圖和PCB布局圖. The AK4627 is a single chip audio CODEC that includes four ADC channels and six DAC channels. The converters are designed with Enhanced Dual Bit architecture for the ADC’s, and Advanced Multi-Bit architecture for the DAC, enabling very low noise performance. The AK4627 ADC supports both single-ended and differential inputs and outputs. A wide range of applications can be realized, including home theater, pro audio and car audio. The AK4627 is available in a 48-pin LQFP package. AK4627主要特性: 4ch 24bit ADC - 64x Oversampling - Sampling Rate up to 96kHz - Linear Phase Digital Anti-Alias Filter - Single-ended / Differential Input - S/(N+D): 92dB (Single-ended, Differential) - Dynamic Range, S/N: 102dB (Single-ended), 103dB (Differential) - Digital HPF for offset cancellation - I/F format: MSB justified, I2S or TDM 6ch 24bit DAC - 128x Oversampling - Sampling Rate up to 192kHz - 24bit 8 times Digital Filter - Single-ended Outputs - On-chip Switched-Capacitor Filter - S/(N+D): 90dB - Dynamic Range, S/N: 106dB - I/F format: MSB justified, LSB justified(20bit,24bit), I2S or TDM - Individual channel digital volume with 128 levels and 0.5dB step - Soft mute - De-emphasis for 32kHz, 44.1kHz and 48kHz - Zero Detect Function High Jitter Tolerance TTL Level Digital I/F 3-wire Serial and I2C Bus μP I/F for mode setting Master clock: 256fs, 384fs or 512fs for fs=32kHz to 48kHz 128fs, 192fs or 256fs for fs=64kHz to 96kHz 128fs for fs=120kHz to 192kHz Power Supply: 4.5 to 5.5V Power Supply for output buffer: 2.7 to 5.5V Small 48pin LQFP 
圖1. AK4627方框圖
圖2. AK4627典型應用電路圖 評估板AKD4627-A The AKD4627-A is an evaluation board for the AK4627, a single chip CODEC that includes four channels of ADC and six channels of DAC. The AKD4627-A also has the digital audio interface and can achieve the interface with digital audio systems via opt-connector or BNC connector. 評估板AKD4627-A主要功能: • On-board analog output buffer circuit • Compatible with 2 types of interface - AK4118 (DIT&DIR) with optical output/input and BNC output/input - Direct interface with AC3 decoder by 10pin header • 10pin header for serial control interface
圖3.評估板AKD4627-A方框圖
圖4.評估板AKD4627-A電路圖(1)
圖5.評估板AKD4627-A電路圖(2)
圖6.評估板AKD4627-A電路圖(3)
圖7.評估板AKD4627-A電路圖(4)
圖8.評估板AKD4627-A電路圖(5)
圖9.評估板AKD4627-A電路圖(6)
圖10.評估板AKD4627-A電路圖(7)
圖11.評估板AKD4627-A元件布局圖 詳情請見: http://www.asahi-kasei.co.jp/akm/en/product/ak4627/ak4627_f00e.pdf 和 http://www.asahi-kasei.co.jp/akm/en/product/ak4627/akd4627-a0-00e.pdf |
