CubieNOS_user_manual_Revision_1.0.pdf

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CubieNOS
user manual
Revision 1.0
Overview
CubieNOS 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 with
enough power to drive low impedance headphones.
Power Requirements
No external power other than supplied to Cubieboard is needed.
Digital section 3.3VDC
Analog section 5VDC
Configuration
CubieNOS is ordered preconfigured with two alternatives.
Version A
Output 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 B
Fixed resampled output frequnecy at 176.4 kHz no matter input frequency.
With basic soldering skills this can be reconfigured to version A.
Technical details
Version A:
Input up to 24bit (output up to 16bit)
No resampling up to 192 kHz
Output 4.7
Ω
balanced
Frequency 4 Hz - 18 kHz, +0 -0.3dB
THD+N = 0.02% (1 kHz)
Version B:
Input up to 24bit (output up to 16bit)
Fixed resampling at 176.4 kHz
Output 4.7
Ω
balanced
Frequency 4 Hz - 22 kHz, +0 -0.3dB
THD+N = 0.02% (1 kHz)
Outputs
L/R Balanced XLR
L/R Unbalanced RCA
L/R Unbalanced headphones 2.54mm pin (header CON_1)
Alphanumeric displayport 2.54mm pin (header CON_2)
Optional
Analog volume control 2.54mm pin (volume control module)
Installation
CubieNOS is easy installed within seconds if you follow this guide.
A
B
Attach 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.
C
D
Insert the short spacers between CubieNOS and Cubieboard.
Insert the screws through CubieNOS-Spacers-Cubiboard and screw into the tall M3 spacer.
D
A
C
B
D
PCB Layout
Overview of CubieNOS PCB layout.
A
B
C
D
L/R Balanced XLR
L/R Unbalanced RCA
CON_1
CON_2
E
F
G
Cubieboard header
I2S configuration
Optional analog volume control
A
B
C
G
D
E
F
CON_1
Pin 1
Pin 2
Pin 3
GROUND
LEFT
RIGHT
I2S configuration
Version A
Connect according to blue schematic for
no resampling configuration.
Version B
Connect according to green schematic for
fixed resapmling at 176.4 kHz
configuration.
Note
Don’t connect to both green and blue schematic,
choose either.
CON_2
Pin 1
Pin 2
Pin 3
GROUND
UART TX
5V
Optional analog volume control
Attach the optional analog volume
control header. The 4 pin header
doesn’t have any direction.

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