Cirrus Logic CDB42428 - Manual (Page 13)

CDB42428
13
3.7 Quick Start Preset - One-Line Mode (OLM)
To measure one-line mode analog in to analog out performance, you will need the following:
• CS424xx Demonstration Board
• +18 VDC, -18 VDC, and +5 VDC power supplies
• Analog 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 analog output from the analyzer to the Left Analog Input J7. Connect J11 analog OUTA1 RCA to the
input of the analyzer. Set the analyzer output to 1.0 VRMS, 1 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 “One-Line Mode.LVS”. This preset will configure the CS424xx
to use OMCK as the master clock, DAC and ADC ports will be masters, and the ADC_SDOUT data will source the
DAC_SDIN1 input. The left/right analog inputs will appear at OUT_A1 and OUT_B1 analog outputs; the
EXT_ADC#1 Left and Right inputs will appear on the OUT_A2 and OUT_B2 analog outputs, respectively; the
EXT_ADC#2 Left and Right inputs will appear on the OUT_A3 and OUT_B3 analog outputs, respectively. The sam-
ple rate will be 48 kHz based upon the 24.576 MHz OMCK.
Step 6 - Measure Audio
You should now have audio appearing at the Analog outputs.