Cirrus Logic CDB42428 - Manual (Page 12)

CDB42428
12
• Analog signal source and analyzer
• Digital signal source and analyzer
• Windows® compatible computer with parallel port cable and CDB425xx software
Step 1 - Follow Initial Board Setup procedure as described above
Step 2 - Connect to Windows® Software
Connect the computer to the board and launch the CDB425xx software.
Step 3 - Connect Signal Source
Connect the analog output from the analyzer to the Left Analog Input J7. Connect the CS8406 digital output (coax
J2 or optical OPT2) to the input of the analyzer. Set the analyzer output to 1.0 VRMS, 1 kHz. Set the analyzer input
to measure digital signal level and apply a 22 Hz-22 kHz filter.
Step 4 - Configure the Board
Using the Windows® software, load the preset script “Single Speed Analog In To Digital Out.LVS”. This preset will
configure the CS424xx to use OMCK as the master clock, DAC and ADC ports will be masters, and the ADC clocks
data will source the CS8406 inputs. The CS8406 will output the ADC digital data to both the optical and RCA jacks.
The single speed sample rate will be 48 kHz based upon the 24.576 MHz OMCK. You may load the similar double
speed or quad speed presets to investigate higher sample rates.
Step 5 - Measure Audio
You should now have digital audio appearing at the ADC_SDOUT port and the CS8406 digital output.
3.6 Quick Start Guide - Digital In to Analog Out
To measure digital to analog performance, you will need the following:
• CS424xx Demonstration Board
• +18 VDC, -18 VDC, and +5 VDC power supplies
• Analog signal source and analyzer
• Digital signal source and analyzer
• Windows® compatible computer with parallel port cable and CDB425xx software
Step 1 - Follow Initial Board Setup procedure as described above
Step 2 - Select Output Filter Jumpers
Set all CDB42428 analog output filter jumpers to the FILT2 settings.
Step 3 - Connect to Windows® Software
Connect the computer to the board and launch the CDB425xx software.
Step 4 - Connect Signal Source
Connect the S/PDIF digital output from the analyzer to the optical input connector OPT4. Connect the analog OUTA1
RCA phono jack J11 to the input of the analyzer. Set the analyzer output to 0 dBFS, 1 kHz, sample rate at 48 kHz.
Set the analyzer input to measure signal level and apply a 22 Hz-22 kHz filter.
Step 5 - Configure the Board
Using the Windows® software, load the preset script “Single Speed Optical In to Analog Out.LVS”. This preset will
configure the CS8416 to source all DAC_SDIN inputs. The test source left/right data will appear at all odd/even an-
alog outputs. You may load the similar double speed or quad speed presets to investigate higher sample rates, but
you must be sure to supply an appropriate speed SPDIF signal.
Step 6 - Measure Audio
You should now have audio appearing at the Analog A1 output.