This product has been discontinued and there is now a better upgraded version.
Increase the interface card and change to a better FPGA solution
as follws:
old version:
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, and the wrong power supply will burn
It is recommended to use dual transformers (ie, separate analog and digital circuits)
Signal receiving solution: dual FPGA
Power module: using LT1963 low noise voltage regulator module
Signal support format: coaxial supports pcm format, up to 24 bits 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:
The mono architecture composed of dual AD1865Rs chooses 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 a very dark sound background, use the nos method to access digital signals, and restore the sound with the original taste and integrity Resolutely abandon the external filter chip as required, and reduce the design cost in addition to highly reducing the sound. This upgrade design uses dual FPGA clock asynchronous integration and noise reduction co-processing, with external 10MHz clock input function, external clock input on the board The indicator 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 human voice is 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.