Diodes PAM8010 - Manual (Page 14)

PAM8010
Document number: DSxxxxx Rev. 1 - 0
14 of 17
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November 2012
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PAM8010
A Product Line of
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Application Information
(cont.)
PCB Layout Guidelines Grounding
At this stage it is paramount to notice the necessity of separate grounds. Noise currents in the output power stage need to be returned to output
noise ground and nowhere else. Were these currents to circulate elsewhere, they may get into the power supply, the signal ground, etc, worse
yet, they may form a loop and radiate noise. Any of these cases results in degraded amplifier performance. The logical returns for the output
noise currents associated with Class-D switching are the respective PGND pins for each channel. The switch state diagram illustrates that
PGND is instrumental in nearly every switch state. This is the perfect point to which the output noise ground trace should return. Also note that
output noise ground is channel specific. A two channel amplifier has two seperate channels and consequently must have two seperate output
noise ground traces. The layout of the PAM8010 offers separate PGND connections for each channel and in some cases each side of the
bridge. Output noise grounds must be tied to system ground at the power in exclusively. Signal currents for the inputs, reference, etc need to be
returned to quite ground. This ground is only tied to the signal components and the GND pin, and GND then tied to system ground.
Ordering Information
Part Number Package Type Standard Package
PAM8010NHR SSOP-24 2500 Units/Tape&Reel
PAM8010DHR SOP-24 1000 Units/Tape&Reel
Marking Information