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–

PCM1609A

A

R

2

R

1

OPA2134

+

2

3

1

10

µF

+

S0056-04

+

OPA337

−

To Additional

Low-Pass

Filter Circuits

PCB LAYOUT GUIDELINES

Digital Logic

and

Audio

Processor

Digital Power

DGND

Digital Section

Analog Section

Return Path for Digital Signals

Analog Power

AGND

Digital

Ground

Analog

Ground

Output

Circuits

PCM1609A

AGND

DGND

REG

B0031-05

PCM1609A

SLES145A – AUGUST 2005 – REVISED AUGUST 2006

APPLICATION INFORMATION (continued)

Figure 33. Single-Supply Filter Circuit

A typical PCB floor plan for the PCM1609A 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

PCM1609A 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

33

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