原标题：AKM AK4492Premium32位两路DAC解决方案

　　akm公司的AK4492是采用VELVET SOUNDTM技术的新一代Premium 32位两路DAC,具有一流低失真特性和低功耗特性,具有六种类型32位8x数字滤波器,可接受高达768kHz PCM数据和11.2MHz DSD数据,THD+N位-115 dB, S/N为127dB.取样速率8kHz-768kHz,主要用在高分辨率音频源播放器,如智能手机,IC录音机,手持音频播放器,蓝牙耳机,USB耳机,CD/SACD播放器,网络音频,AV接收器等.本文介绍了AK4492主要特性,框图,连接图和多种应用电路,以及评估板AKD4492-SB-TypeS主要功能,框图和电路图.

　　The AK4492 is a new generation Premium 32-bit 2ch DAC with VELVET SOUNDTM technology, achieving industry’s leading level low distortion characteristics. The OSR-Doubler technology establishes low power consumption and low distortion characteristics. Moreover, the AK4492 has six types of 32-bit digital filters, realizing simple and flexible sound tuning in wide range of applications. The AK4492 accepts up to 768kHz PCM data and 11.2MHz DSD data, ideal for a high-resolution audio source playback that are becoming widespread in smartphone, portable audio player etc.

　　AK4492应用:

　　Smart Cellular Phones, IC-Recorders, Bluetooth Headphones, CD/SACD Players, Network Audios, USB DACs, USB Headphones, Sound Plates/Bars, HD Audio/Voice Conference Systems, AV Receivers

　　AK4492主要特性:

　　 THD+N: -115 dB

　　 DR, S/N: 127 dB (2 Vrms Output)

　　 128 Times Over Sampling

　　 Sampling Rate: 8kHz-768 kHz

　　 32-bit 8x Digital Filter

　　- Short Delay Sharp Roll-off, GD=6.0/fs,

　　Ripple: +/- 0.005dB, Attenuation: 100dB

　　- Short Delay Slow Roll-off, GD=5.0/fs

　　- Sharp Roll-off

　　- Slow Roll-off

　　- Low-dispersion Short Delay Filter

　　- Super Slow Roll-off

　　 High Tolerance to Clock Jitter

　　 Low Distortion Differential Output

　　 2.8 MHz, 5.6 MHz, 11.2 MHz DSD Input Support

　　- Filter1 (fc = 39 kHz, 2.8 MHz mode)

　　- Filter2 (fc = 76 kHz, 2.8 MHz mode)

　　 Digital De-emphasis for 32, 44.1and 48kHz sampling

　　 Soft Mute

　　 Digital Attenuator (255 levels and 0.5dB step + mute)

　　 Mono Mode

　　 External Digital Filter Interface

　　 Audio I/F Format: 24/32 bit MSB justified, 16/20/24/32 bit LSB justified, I2S, DSD, TDM

　　 Master Clock

　　8 kHz ~ 32 kHz: 256 fs or 384 fs or 512 fs or 768 fs or 1024 fs or 1152 fs

　　8 kHz ~ 54 kHz: 256 fs or 384 fs or 512 fs or 768 fs

　　8 kHz ~ 108 kHz: 256 fs or 384 fs

　　108 kHz ~ 216 kHz: 128 fs or 192 fs

　　~384 kHz: 32 fs or 48 fs or 64 fs or 96 fs

　　~768 kHz: 16 fs or 32 fs or 48 fs or 64 fs

　　 3-wire, I2C-bus Interface

　　 Power Supply:

　　(by Internal LDO)TVDD=AVDD= 3.0-3.6V, VDDL/R= 4.75 ~ 5.25V

　　(by external supply)TVDD=AVDD= (DVDD) -3.6V, DVDD=1.7 -1.98V,

　　VDDL/R= 4.75- 5.25V

　　 Operational Temperature Rnage: −40-85 ℃

　　 Digital Input Level: CMOS

　　 Package: 96-pin WLCSP

　　图1. AK4492框图

　　图2. AK4492典型连接图

　　图3. AK4492和AK8157连接电路图

　　图4. AK4492和AK4205连接电路图

　　评估板AKD4492-SB-TypeS

　　AKD4492-SB-TypeS is the best evaluation board for audio solution to need high quality sound and area saving, such as Hi-Fi audio solution for smartphone, high end portable audio equipment and USB-DAC.

　　The AKD4492-SB-TypeS is equipped with 32 bit DAC AK4492, audio-only PLL AK8157A and LPF visceral headphone amplifer AK4205. Therefore the board is possible to drive headphone with ultra low distortion and ultra low noise. Moreover AK1110, 5V LDO designated for the DAC, can realize good characteristics and high quality sound. The AKD4492-SB-TypeS has digital audio interfaces. They can interface to digital audio systems via optical or coaxial connector.

　　AKD4492-SB-TypeS -- Evaluation board composed of AK4492, AK4205, AK8157A and AK1110.

　　评估板AKD4492-SB-TypeS功能:

　　 SPDIF is accepted by Digital Audio Interface (AK4118A).

　　 I2S data and DSD data is inputted directly through the 10-pins header for the external digital input interface.

　　 AK4492-SB has AK8157A(PLL for audio) for application processor of smartphone.

　　 Easy control is possible because of the PIC micro controller for the device control on the board.

　　 Only single power supply +3.7V can operate AKD4492-SB-TypeS because of LDO and DCDC on the board.

　　图5.评估板AKD4492-SB-TypeS外形图

　　图6.评估板AKD4492-SB-TypeS框图(不用AK8157,SPDIF输入)

　　图7.评估板AKD4492-SB-TypeS框图(外接PCM输入)

　　图8.评估板AKD4492-SB-TypeS框图(用AK8157A,外接PCM输入)

　　图9.评估板AKD4492-SB-TypeS板概述图

　　图10.评估板AKD4492-SB-TypeS电路图(1)

　　图11.评估板AKD4492-SB-TypeS电路图(2)

　　图12.评估板AKD4492-SB-TypeS电路图(3)

　　图13.评估板AKD4492-SB-TypeS电路图(4)

　　图14.评估板AKD4492-SB-TypeS电路图(5)

　　图15.评估板AKD4492-SB-TypeS电路图(6)

　　详情请见:

AK4492ECB.pdf