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.