New finished Dual AD1865R NOS DAC vinyl style decoder board dual FPGA 10MHZ atomic clock asynchronous processing R2R decoding
Product name：Dual parallel R2R decoding AD1865R NOS DAC
size：120*170mm
signal input: 1. Coaxial (SPDIF) 2. I2S
Clock input
1. Onboard high frequency dual crystal oscillator 2. External 10MHZ atomic clock, constant temperature clock, etc.
Voltage input:
AC 12V-0
AC 0V-0
AC12V-1
AC 0V-1
AC9V-0
AC 0V-0
AC9V-1
AC 0V-1
AC9V-2
AC 0V-2
Each group of voltage cannot be connected in parallel (DIY players, please
read carefully, and you will bear the consequences if you connect the
wrong power supply and burn it)
It is recommended to use dual transformers (ie, separate analog and digital circuits)
Signal receiving plan: Dual FPGA
Power module：Using LT1963 low noise voltage regulator module
Signal support format: Coaxial supports pcm format, up to 24-bit 384Kkhz. I2S
supports Philips I2S, xmos interface, Italian interface, etc., Bluetooth
module with I2S output, only needs to connect to the three pins of BCK
LRCK DATA.
Technical parameters of decoder board: Mono architecture composed of dual
AD1865Rs, choose the internal operational amplifier of the chip. Direct
current output with external IV circuit, and lpf circuit, with precise
noise cut-off technology to limit out-of-band noise, with extremely dark
sound background, using nos method to access digital signals, and
restore the sound with the original taste and integrity Resolutely
abandon the external filter chip as required. In addition to highly
reducing the sound, it also reduces the design cost. This upgrade design
uses dual FPGA clock asynchronous integration and noise reduction
collaborative processing, with an external 10MHz clock input function,
and an external clock input on the board. The indicator light will light
up. It has the function of automatic recognition of the external clock,
which greatly improves the playability of this decoder board.
In addition, the parameters have been tuned many times to make the sound
more like a vinyl record, and the low frequency is sonorous and
powerful. AD1865R is one of the classic R2R DACs. It is characterized by
long-term listening and a good sense of music. The more you listen, the
more flavorful it is, and it is quite ear-catching. High resolution,
not noisy, relaxed and atmospheric. The low frequency is powerful, soft
and not fatty. The vocals are sweet, not illusory, and the real presence
is fully present. The decoding supports up to 24-bit 384KHZ, which is
not inferior to most popular decoding chips.
The following is an upgraded version
The Italian interface is added, the power supply is replaced with ON
Semiconductor modules, and the FPGA upgrade program is the background
GENG cleanup.
