PCM4222 datasheet(28/44 Pages) TI2

28 / 44 page

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

MOD1 data output (LSB)

HPFDR

MOD2 data output

HPFDL

MOD3 data output

FS0

MOD4 data output

FS1

MOD5 data output

MOD6 data output

DSDEN

MCKO master clock output ( fMCKO = fMCKI )

SUB1

WCKO word clock output ( fWCKO = fMCKO÷ 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.

Submit Documentation Feedback

PCM4222 Datasheet(PDF) 28 Page - Texas Instruments