PCM1602 datasheet(26/29 Pages) TI

26 / 29 page

PCM1602

SBAS163

PCB LAYOUT GUIDELINES

A typical PCB floor plan for the PCM1602 is shown in

Figure 16. A ground plane is recommended, with the analog

and digital sections being isolated from one another using a

split or cut in the circuit board. The PCM1602 should be

oriented with the digital I/O pins facing the ground plane

split/cut to allow for short, direct connections to the digital

audio interface and control signals originating from the

digital section of the board.

Separate power supplies are recommended for the digital and

analog sections of the board. This prevents the switching noise

present on the digital supply from contaminating the analog

power supply and degrading the dynamic performance of the

DACs. In cases where a common +5V supply must be used for

the analog and digital sections, an inductance (RF choke,

ferrite bead) should be placed between the analog and digital

+5V supply connections to avoid coupling of the digital

switching noise into the analog circuitry. Figure 17 shows the

recommended approach for single-supply applications.

FIGURE 16. Recommended PCB Layout.

FIGURE 17. Single-Supply PCB Layout.

PCM1602

DGND

Return Path for Digital Signals

Analog

Ground

Digital

Ground

AGND

Output

Circuits

DIGITAL SECTION

ANALOG SECTION

Digital Logic

and

Audio

Processor

Digital Power

DGND

Analog Power

+5V

AGND

REG

–V

PCM1602

DGND

Output

Circuits

RF Choke or Ferrite Bead

Common

Ground

AGND

DIGITAL SECTION

ANALOG SECTION

Power Supplies

+5V

GND

REG

–V

Digital Logic

and

Audio

Processor

PCM1602 Datasheet(PDF) 26 Page - Texas Instruments

PCM1602 Datasheet(HTML) 26 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29

Datasheet Download

Link URL