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CDB43L22
3. CONFIGURATION OPTIONS
In order to configure the CDB43L22 for making performance measurements, one needs to use Cirrus Logic’s Win-
dows compatible FlexGUI software to program the various components on the board. This section serves to give a
deeper understanding of the on-board circuitry and the digital clock and data signal routing involved in the different
configuration modes of the CDB43L22. The section also has the expected performance characteristics which are
observed when using the board in the respective configuration mode.
3.1
SPDIF In to Headphone or Line Out
The CS43L22’s stereo headphone/line output performance can be tested by loading the “SPDIF In to
Headphone or Line Out” quick setup file provided with the software package. The script configures the
digital clock and data signal routing on the board as shown in Figure 1 .
Stereo audio outputs can be monitored on the 1/8” jacks J21 or J40. HP jack J21 can be used to connect a
real headphone to provide an actual headphone load while performance measurements are taken on HP
jack J40. Digital S/PDIF input can be provided on the optical (OPT2) or RCA (J68) jacks. Jumpers J8 and
J9 can be used to select output loads and jumpers J1 and J2 can be used to select filtered or unfiltered
outputs. Refer to Section 4 on page 11 for details on software configuration.
CS43L22
FPGA
CS8416
MCLK
LRCK
SCLK
SDIN
S/PDIF Rx
RX.RMCK
RX.LRCK
RX.SCLK
RX.SDOUT
S/PDIF
IN
(MASTER)
(SLAVE)
HP/LINE_OUTA
HP/LINE_OUTB
J9
32 Ω
32 Ω
J3
16 Ω
16 Ω
J21
HP
Connect
J1
J2
HP/Line
Output
J40
Figure 1. SPDIF In to Headphone or Line Out
Table 1 shows the expected performance characteristics one should expect when using the CDB43L22 for
SPDIF In to Headphone or Line Out measurements.
Plot
FFT - S/PDIF Input to HP Output @ -1dBFS
FFT - S/PDIF Input to HP Output @ -60dBFS
THD+N vs. HP Output Power
Location
Figure 19 on page 29
Figure 20 on page 29
Figure 21 on page 29
Frequency Response- S/PDIF Input to HP Output @ 0dBFS Figure 22 on page 29
THD+N - S/PDIF Input to HP Output
Dynamic Range- S/PDIF Input to HP Output @ -60dBFS
Figure 23 on page 29
Figure 24 on page 29
Table 1. SPDIF In to Headphone or Line Out Performance Plots
8
DS792DB1
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