AKM公司的AK4688是一款立體聲音頻CODEC。內(nèi)嵌支持異步操作的24位ADC和DAC輸入/輸出數(shù)據(jù)接口，通過外部電阻調(diào)節(jié)預(yù)放大器的輸入范圍來支持線路輸入。內(nèi)部集成一個(gè)電荷泵，通過3.3V單電源供電，獲得一個(gè)對地2Vrms電源，以減少外部交流耦合電容及抑制電路。AK4688芯片ADC部分動(dòng)態(tài)范圍為99dB，DAC部分動(dòng)態(tài)范圍為105dB。設(shè)計(jì)方案不僅介紹了AK4688芯片ADC及DCA的特性，而且還介紹了該芯片的異步操作特性。同時(shí)，本方案提供了一個(gè)S/PDIF接口以方便連接數(shù)字音頻設(shè)備。本文詳細(xì)介紹了AK4688的主要特性、內(nèi)部框圖、應(yīng)用框圖以及采用AK4688芯片設(shè)計(jì)的評估開發(fā)板電路原理圖及PCB Layout圖。
The AK4688 is a stereo audio CODEC. The integrated ADC and DAC interfaces accept up to 24-bit input/output data and support an asynchronous operation. The input range of the pre-amplifier, that supports line inputs, is adjustable by an external resistor. A ground referenced 2Vrms output with a 3.3V single power supply is achieved by an integrated charge pump, reducing external parts such as AC-coupling capacitors and mute circuits. The ADC block of the AK4688 achieves a dynamic range of 99dB, and the DAC block achieves a dynamic range of 105dB. The AK4688 is suitable for digital recording systems, digital TVs, Blu-ray recorders and Home theater systems.
AK4688主要特性
􀂆Asynchronous ADC/DAC Operation
􀂆Capless Stereo Pre-amplifier for Line Input/Output
􀂆24bit Stereo ADC
- 64x Oversampling
- Sampling Rate up to 48kHz
- Linear Phase Digital Anti-Alias Filter
- S/(N+D): 83dB
- Dynamic Range, S/N: 99dB
- Digital HPF for Offset Cancellation
􀂆24bit Stereo DAC
- 128x Oversampling
- Sampling Rate up to 192kHz
- 24bit 8 times Digital Filter
- S/(N+D): 95dB
- Dynamic Range, S/N: 105dB
- De-emphasis Filter
􀂆High Jitter Tolerance
􀂆External Master Clock Input:
256fs, 384fs, 512fs 768fs (fs=32kHz ～ 48kHz)
128fs, 192fs, 256fs 384fs (fs=64kHz ～ 96kHz)
128fs, 192fs (fs=128kHz ~ 192kHz)
􀂆2 Audio Serial I/F (PORT1, PORT2)
- Master/Slave mode (PORT1)
- I/F format
PORT1, 2: MSB, LSB justified (16/24 bit), I2S
􀂆Hardware / I2C-bus Control
􀂆Operating Voltage:
- Digital I/O and Charge Pump: 3.0V ～ 3.6V
- ADC Analog: 3.0V ～ 3.6V
- DAC Analog: 3.0V ～ 3.6V
􀂆
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