Datasheet

www.ti.com
TYPICAL CONNECTIONS
PCM4222
SBAS399A – OCTOBER 2006 – REVISED MARCH 2007
Table 11. MBM Mode Pin Mapping vs PCM and DSD Modes
PIN NUMBER MBM MODE FUNCTION PCM AND DSD MODE FUNCTION
17 MOD1 data output (LSB) HPFDR
18 MOD2 data output HPFDL
19 MOD3 data output FS0
20 MOD4 data output FS1
21 MOD5 data output DF
22 MOD6 data output DSDEN
25 MCKO master clock output ( f
MCKO
= f
MCKI
) SUB1
26 WCKO word clock output ( f
WCKO
= f
MCKO
÷ 2 ) SUB0
Figure 48 and Figure 49 provide typical connection diagrams for the PCM4222. Figure 48 illustrates an
application where both PCM and DSD outputs are available. Figure 49 illustrates connections for a typical
application using the Multi-Bit Modulator output mode. Both figures show recommended power-supply bypass
and reference filter capacitors. These components should be located as close to the corresponding PCM4222
package pins as physically possible. Larger power-supply bypass capacitors may be placed on the bottom side
of the printed circuit board (PCB). However, reference decoupling capacitors should be located on the top side
of the PCB to avoid issues with added via inductance.
As Figure 48 illustrates, the audio host device may be a digital signal processor (DSP), digital audio interface
transmitter (DIT), or a programmable logic device. DSD data capture may be accomplished using a
programmable logic device or an audio host capable of capturing/processing the 1-bit data.
In Figure 49 , the modulator output may be connected to a programmable logic device that is configured to
perform digital decimation filtering and post-processing tasks.
28
Submit Documentation Feedback