Configuration options, 1 spdif in to headphone or line out, Figure 1. spdif in to headphone or line out – Cirrus Logic CDB43L22 User Manual

Page 8: Figure 1.spdif in to headphone or line out, Fer to, S/pdif in

DS792DB1

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.

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.

Table 1.

SPDIF In to Headphone or Line Out

Performance Plots

Plot

Location