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–

PCM1608

A

V + *

R

2

R

1

VCOM

OPA2134

+

2

3

1

C1

R3

R2

C2

R1

C3

10

µF

+

S0056-03

R4

+

OPA337

−

To Additional

Low-Pass

Filter Circuits

VOUT

VIN

PCB LAYOUT GUIDELINES

Digital Logic

and

Audio

Processor

Digital Power

+VD

DGND

Digital Section

Analog Section

Return Path for Digital Signals

Analog Power

+VS

AGND

−VS

+5VA

Digital

Ground

Analog

Ground

Output

Circuits

PCM1608

AGND

VCC

VDD

DGND

REG

B0031-04

PCM1608

SBAS164B – DECEMBER 2000 – REVISED JULY 2005

APPLICATION INFORMATION (continued)

Figure 33. Single-Supply Filter Circuit

A typical PCB floor plan for the PCM1608 is shown in Figure 34. 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 PCM1608

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.

Figure 34. Recommended PCB Layout

34