PCM1691 datasheet(40/47 Pages) TI

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PCB LAYOUT GUIDELINES

DigitalLogic

and

Audio

Processor

DigitalPower

+3.3V

DGND

DigitalSection

AnalogSection

ReturnPathfor3.3V

D andDigitalSignals

AnalogPower

AGND

-VS

+5V

Digital

Ground

Analog

Ground

Output

Circuits

PCM1691

AGND

VDD

DGND

VCC

PCM1691

SBAS450 – OCTOBER 2008.............................................................................................................................................................................................. www.ti.com

A typical printed circuit board (PCB) layout for the PCM1691 is shown in Figure 45. A ground plane is

recommended, with the analog and digital sections isolated from one another through a split or cut in the circuit

board. The PCM1691 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 configuration

prevents the switching noise present on the digital supply from contaminating the analog power supply and

degrading the dynamic performance of the PCM1691.

Figure 45. Recommended PCB Layout

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PCM1691 Datasheet(PDF) 40 Page - Texas Instruments

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