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I have been asked many times about the multi channel DAC, more advanced than very simple ATDAC-91, but cheaper than ATDAC-9, for multi channel (5.1-7.1) and multi-band applications.
Also some people asks about more then 8 channels - to build multi-channel and multi-band system, for example - 7.1 home cinema system with multi-band front and center speakers and DBA (Double Bass Array sub woofer).

As a result, ATDAC-92 was designed.

The basic version is 8-channel, supporting PCM from 44.1
up to 192kHz, bit depth - up to 32 bits.
There is no DSD support, because there is no way to do digital crossover without converting DSD to PCB, and so no sense to the back conversion to DSD.

The USB input (XMOS) has the main features of the xV / xVM USB interfaces, as:
- UAC2 asynchronous operation,
- powering of the USB part from the PC,
- full galvanic isolation of the DAC from the USB part,
- clocking from an oscillator located near the DAC chip,
- Clock Monitor, which allows the PC "not to notice" the absence of the clock from the DAC, for example, if the DAC is powered off.

The DAC is based on the AK4458 chip and LM49723 based Low Pass Fillter/Output Buffer.

ATDAC-92 is powered from two power sources (not included):
1) + 5-7VDC, up to 50mA to supply the digital circuits.
+/- (15-20) VDC, up to 30-40mA on the minus and up to 60-70mA on the positive power supply.

As you can see, the power consumption is not exceeds 2 watts in the worst case.

The LM317 / LM337 (TO-220) voltage regulators  can be installed without the heatsinks (just 16 channel version can require).

ATDAC-92 can be extended to 16 channels, with a daughter board.
The maximum sampling rate at 16ch configuration is 96 kHz (the restriction is caused by a limited band pass of the USB stack in XMOS and it's the driver).

The nominal output voltage (0dBFs) is 2.3Vrms.

Both the 8-channel and 16-channel versions can be supplemented with a small CPU daughter board (under development now) to extend the functionality:
- volume control (digital), with indication,
- 7-segment LED display, volume and sample rate indication,
- DAC digital filters
switching, with indication,
- control of (external) mute relays.

Functional diagram: