R261 datasheet(9/28 Pages) ONSEMI

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BelaSigna R261

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Applications Information

Recommended Circuit Design Guidelines

BelaSigna R261 is designed to allow both digital and

analog processing in a single system. Due to the

mixed−signal nature of this system, careful design of the

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

high audio fidelity of BelaSigna R261. 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 at the ground terminal of a capacitor on the output

of the power regulator as illustrated in Figure 3.

Figure 3. Schematic of Ground Scheme

BelaSigna R261

VBAT

VBATRCVR

VDDO

VDDD

VDDA

VREG

Digital Ground Plane

(keep away from

VSSD

Analog Ground Plane

(place under analog side

VSSA

Battery

LDO

1.8 V − 3.3 V

VSSRCVR Ground

(route separately to system ground plane)

VSSRCVR

System Ground Plane

of BR261)

analog ground place)

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