CubieNOS user manual Revision 1.0, Android
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//-->CubieNOSuser manualRevision 1.0OverviewCubieNOS is a 16-bit stereo audio reference DAC module designed for A10-Cubieboard and A20-Cubieboard.Based on dual Philips D/A converters for fully balanced design and a Burr Brown buffered output stage withenough power to drive low impedance headphones.Power RequirementsNo external power other than supplied to Cubieboard is needed.Digital section 3.3VDCAnalog section 5VDCConfigurationCubieNOS is ordered preconfigured with two alternatives.Version AOutput frequnecy equals input frequnecy. Meaning, if input feed is 44.1 kHz, CubieNOS outputs 44.1 kHz.With basic soldering skills this can be reconfigured to version B.Version BFixed resampled output frequnecy at 176.4 kHz no matter input frequency.With basic soldering skills this can be reconfigured to version A.Technical detailsVersion A:Input up to 24bit (output up to 16bit)No resampling up to 192 kHzOutput 4.7ΩbalancedFrequency 4 Hz - 18 kHz, +0 -0.3dBTHD+N = 0.02% (1 kHz)Version B:Input up to 24bit (output up to 16bit)Fixed resampling at 176.4 kHzOutput 4.7ΩbalancedFrequency 4 Hz - 22 kHz, +0 -0.3dBTHD+N = 0.02% (1 kHz)OutputsL/R Balanced XLRL/R Unbalanced RCAL/R Unbalanced headphones 2.54mm pin (header CON_1)Alphanumeric displayport 2.54mm pin (header CON_2)OptionalAnalog volume control 2.54mm pin (volume control module)InstallationCubieNOS is easy installed within seconds if you follow this guide.ABAttach the CubieNOS female header to Cubieboard male header.Notice 1 row of pins is left out.Otherwise CubieNOS will not work and the screw installation later on will not fit.CDInsert the short spacers between CubieNOS and Cubieboard.Insert the screws through CubieNOS-Spacers-Cubiboard and screw into the tall M3 spacer.DACBDPCB LayoutOverview of CubieNOS PCB layout.ABCDL/R Balanced XLRL/R Unbalanced RCACON_1CON_2EFGCubieboard headerI2S configurationOptional analog volume controlABCGDEFCON_1Pin 1Pin 2Pin 3GROUNDLEFTRIGHTI2S configurationVersion AConnect according to blue schematic forno resampling configuration.Version BConnect according to green schematic forfixed resapmling at 176.4 kHzconfiguration.NoteDon’t connect to both green and blue schematic,choose either.CON_2Pin 1Pin 2Pin 3GROUNDUART TX5VOptional analog volume controlAttach the optional analog volumecontrol header. The 4 pin headerdoesn’t have any direction.
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