The dam1021 is a DAC module based on a discrete R-2R sign magnitude DAC design, with FPGA based FIFO buffering/reclocking and custom digital filters, < 1 ps jitter clock generator, with 28 bit resolution so there is headroom, oversampling up to 3.072 Mhz. Up to 24 bit / 384 Khz input from SPDIF, I2S and USB (via USB to I2S interface board), with isolation on the I2S interface. The board is very flexible, with digital volume control and filter parameters that can be downloaded. The board is fully firmware upgradable over a simple serial connection, which enables new features later on. For now we plan to add digital crossover filters soon.
The basis R-2R network has an output voltage of 1.4V RMS and output impedance of 625 ohm and can therefore drive a lot of things directly. There is also onboard balanced output drivers that can drive high impedance (>= 300 ohm) headphones directly. The power supply is also onboard, just add a 5W+ toroid transformer.
|THD @ -1db||0.005%|
|THD @ -60dB||0.03%|
|S/N 20 Khz Bandwith||127 dB unweighted|
|Frequency Range +0.1dB -1.0dB||20hz - 20Khz|
|Output unbuffered||Single ended 1.4V RMS, Zout 625R|
|Output buffered||Balanced 4.0V RMS, Zout 20R|
|Power input||7-8V AC or +-7-15V DC max 5W|
|Board size||3.2" x 5.8" (81 x 147 mm)|