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 SDA-1 is a high-performance DAC developed by our Singxer team. It uses XMOS’ latest xCORE-200 series chip XU208 as the USB Audio solution, uses AKM’s third-generation flagship DAC: AK4493EQ as the main chip for digital-to-analog conversion, AK4118 as the digital audio input receiver chip, and uses STM32 as the control core of the whole machine. , Xilinx''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s large-scale FPGA is used as a clock system and digital audio stream processing. PCM supports up to 384Khz, DSD adopts native direct solution technology, and supports up to DSD512.

   DAC chip adopts AK4493EQ released by AKM in early 2018; DSD adopts native direct solution mode, DSD digital stream does not pass through internal digital filter, and works inNOS mode,It is fully in line with the design idea of ??HQPlayer.

    has a wealth of input and output interfaces, including standard USB2.0 input interface, SPDIF and BNC coaxial and AES balanced input, HDMI-I2S input interface, analog output including XLR balanced output and RCA single-ended Output; full interface supports DSD input.

Main technical features:

1. Self-developed adaptive clock system technology, built-in 4 independent ultra-low jitter audio crystal oscillators, and configure a femtosecond-level local clock system for the USB part（Customized version of CCHD-575）；

2. High-performance digital-analog hybrid phase-locked loop, excellent clock synchronization recovery technology, can greatly filter the secondary PLL of the external digital input jitter;

3. Source synchronization technology and FPGA shaping technology, to reshape the isolated I2S signal, thereby eliminating the additive jitter caused by the isolation chip;

4. Large-scale FPGA for digital audio signal processing, self-developed algorithms, and original multi-input channel isolation technology to ensure the purity of each input signal.

Domestic unityThe retail price is 4680 yuan, and the unified overseas retail price is 699USD.

Domestic default deliveryThe 230V version does not support voltage switching;

The foreign version supports 115V and 230V AC voltage switching, and there is a switch inside.

More information and descriptions are being updated one after another.

SDA-1 front panel

SDA-1 is small in size, with a width of 266MM. 

Technical index:

Sampling rate supported by each input interface:

PCM: 44.1KHz, 48KHz, 88.2KHz, 96KHz,

   176.4KHz,192KHz,352.8KHz,384KHz

   [USB and I2S support all sampling rates, S/PDIF supports up to 192KHz]

DSD: 2.8 MHz (DSD64)   -  DoP,native

   5.6 MHz (DSD128)  -  DoP,native

   11.2 MHz (DSD256) -  DoP,native

   22.5792 MHz (DSD512) -  native

   [USB and I2S support all DSD formats, S/PDIF and AES/EBU support DSD64 DOP mode]

Bit width: up to 32 bit over USB and I2S

    up to 24 bit over S/PDIF

Electrical standards for each interface:

1. The USB input socket is a standard USB-B type female socket, and the USB power supply range is 4.5V-5.1V;

2. The SPDIF interface inputs standard S/PDIF signals, the input impedance is 75 ohms, and the AES input impedance is 110 ohms;

3. The power input is 115V/230V AC, and the imported TALEMA transformer is used internally for power supply;

4. I2S input is LVDS level in the form of HDMI interface, compatible with SU-1 interface;

SDA-1 has rich input interfaces and 5 digital inputs, so all input interfaces support DSD.

The internal diagram of SDA-1, using double Talema/NORATEL PorcupineNiu''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s power supply design.

AP measured map:

PCM fs=44.1Khz THD+N（1khz）Distortion test

 

 

PCM fs=44.1Khz （1khz）FFT analysis chart

PCM fs=44.1Khz distortion-frequency distribution graph

PCM fs=44.1Khz frequency response

DSD128  FFT analysis chart