Check the listing for details. AK4499EXEQ+AK4191EQ Audio DAC Decoder RCA Output I2S/DSD 32bit 1536KHZ DSD1024. Color: Black, Condition: New. Listed at 110.44 USD. AK4499EXEQ I2S/DSD 32bit 1536KHZ DSD1024Finished board:The finished board is tested and shipped!DIY Kits:AK4499 AK4191 chip semi-finished kit is not included!AK4499EXEQ and AK4191EQ chips are not included, these two chips need to be purchased and welded by yourselves, and other components are included! Other components are welded by default only patches and a small number of plug-ins, and most of the remaining plug-ins need to be welded by the buyer.Reference to the official evaluation board layout design (note not directly engraved or duplicated only the overall layout according to the official structure is not directly used to the official PCB made a lot of modifications) VREF uses two independent LT3042, the other parts of the DAC chip are independent power supply design! This board is a single-ended or differential output switching design, can be a single-ended or differential output switching!The modular design of the DAC chip is not only convenient for PCB routing but also can reduce the noise interference of the ground wire to a certain extent, both are positively improved! The analog part of the DAC board refers to the official EVM design, and the effect is more guaranteed!Operational Amplifier Configuration: IV conversion OPA1612*2; single-ended output OPA1611*2This version supports I2S/DSD decoding! Pure soft control (onboard MCU)!Independent design using I2S/DSD signal input!I2S supports the highest 32bit data 1536KHz sampling rate! At the same time, support DSD decoding, support 2.8MHz, 5.6MHz, 11.2MHz, 22.5MHz 45.15MHz (corresponding to DSD64 DSD128 DSD256 DSD512 DSD1024) DSD sampling rate!Because AK4499EXEQ+AK4191EQ official adopts a new design, all audio signals, whether I2S or DSD sampling rate, can be automatically identified without loss (without affecting performance), so there is no longer a need for manual control of sampling rate settings!The board with mute function, with the Italian interface can achieve DSD without noise!Support soft control volume (VOL port is connected to 10K single potentiometer, the default is not connected to the potentiometer with a short-circuit cap for the maximum volume)!Differential (balanced) output or single-ended RCA output is switchable design (switched by on-board relay). Both outputs will affect each other's performance, so switchable output design is adopted. Through XRSW port control, the default disconnection is single-ended RCA output, and short-circuit XRSW port is XLR differential (balanced) output. XRSW port can be externally connected to self-locking switch/button switch to achieve one-key switching output mode!(The principle of K port function is to control the single chip microcomputer with K port, and then the single chip microcomputer soft-control DAC chip)I. I2S data alignment format SettingsThrough K port K1 K2 K3 setting2, digital filter SettingsThrough K port K5 K6 K7! As shown below:3, MCLK signal working frequency setting!Through K port K port K8 K9 KA! As shown below:The test found that some MCLK frequencies outside the table can also be used, but in order to ensure stability and compatibility to avoid errors, it is recommended to strictly adhere to the MCLK frequency range in the table!!4, DSD Volumio Bypass modesettingthrough K port KB, KB is disconnected for normal mode, short KB for Volumio Bypass mode, after opening the Volumio Bypass mode DSD filter can be used, but the sampling rate of DSD working mode can only work in DSD512, DSD1024 will not be able to use!5, synchronous asynchronous mode settingthrough KC setting, disconnected KC for synchronous mode, synchronous mode MCLK need to be synchronized with BCK/LRCL/DCLK. Short KC for asynchronous mode MCLK can not be synchronized with BCK/LRCL/DCLK!6, DSD filter settingthrough KD setting, disconnected KD cut-off frequency is low, short KD cut-off frequency is high, DSD filter must be effective in the Volumio Bypass mode.7, enable or turn off the automatic identification DSD/PCM mode settingthrough KF, KF disconnected when the automatic identification function is turned off, need to set DSD/PCM mode through DSDON signal or KG. Short KF for automatic identification mode, because the chip with the automatic identification mode can not guarantee 100% accuracy so in the scenario of signal changes frequently is not recommended to use the automatic identification mode!8, DSD/PCM mode settingthrough KG setting, this function is effective in the automatic identification mode is turned off! Can be set by DSDON signal or KG DSD/PCM mode, DSDON signal high level (3.3V) for DSD mode, DSDON signal low level (0V) for PCM mode, or in KG disconnection for DSD mode KG short-circuit for PCM mode, it is worth noting that KG and DSDON signal can not be used at the same time, use KG when please disconnect DSDON signal, use DSDON signal please disconnect KG, otherwise it may cause circuit damage......9, reserved portK4 and KE port for reserved port temporarily unused, please keep the default disconnection state!!!I2S/DSD input port No. 7 (DATA2/NC/D2) is not used please keep the disconnection state!!!10, mute setting!Through the I2S/DSD input port pin 8 to set the mute function, input high level (3.3V) for mute, default disconnection or input low level (0V) for normal playback.I2S Interface definition:1 DSDON/NC ; 2 GND ; 3 DATA/DSDL ; 4 BCK/DCLK ; 5 MCLK ; 6 LRCK/DSDR ; 7 NC/D2/DATA2(please disconnect if not in use); 8 MUTEPCB Size:165*130*25 mmDACpower supply:Analog amplifier power supply is DC plus or minus 15V (DC+-15V MAX) (note that it is DC dual 15V input, wrong AC or line sequence connection will cause permanent damage to the circuit!) The maximum voltage range of the analog op amp part is DC plus or minus 15V, please do not exceed this range will damage the board, other power supply 3 groups of AC single 7.5-9V (here can be AC or DC!) .Attention!! The protection diode P6KE18A on the board is damaged (breakdown or burn) will be regarded as artificial damage and will lose the warranty.Because this board analog part of the power supply is dual DC input, so need rectifier filter voltage regulator power supply!Since this board is a direct incoming I2S/DSD signal (without digital reception function), coaxial and fiber optic digital reception needs to be purchased separatelyThis product does not provide schematics and other documents! Only interface definitions are provided (written in the introduction or marked on the board)!