R262 datasheet(8/28 Pages) ONSEMI

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BelaSigna R262

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Applications Information

Recommended Circuit Design Guidelines

BelaSigna R262 is designed to allow both digital and

analog processing in a single system. Due to the mixed−

signal nature of this system, careful design consideration of

the printed circuit board (PCB) layout is critical to maintain

the high audio fidelity of BelaSigna R262. To avoid

coupling noise into the audio signal path, keep the digital

traces away from the analog traces. To avoid electrical

feedback coupling, isolate the input traces from the output

traces.

Recommended Ground Design Strategy

The ground plane should be partitioned into two parts: the

analog ground plane (VSSA) and the digital ground plane

(VSSD). These two planes should be connected together at

a single point, known as the star point. The star point should

be located close to the negative terminal of the power source,

as illustrated in Figure 2.

All ground returns should be routed separately back to the

appropriate ground plane, i.e. do not share a ground return.

Ensure that different ground and/or power planes do not

overlap each other if located on different layers in the board.

Figure 2. Schematic of Ground Scheme

BelaSigna R262

VBATRCVR

VDDO

VDDD

VDDA

VREG

Digital Ground Plane

(keep away from

analog ground plane,

place under digital side of BR262)

VSSD

Analog Ground Plane

(place under analog side of BR262)

VSSA

Battery

1.8V − 3.3V

VSSRCVR Ground

(route separately to star ground point)

VSSRCVR

Start Ground

Point

VBAT

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