E-TDA7375V Datasheet, PDF (12/15 Pages) STMicroelectronics – 2 x 35W dual/quad power amplifier for car radio

TDA7375V
Figure 28. Waveforms
Figure 29. Interface circuitry to differentiate the information schematic
5.9 PCB-LAYOUT GROUNDING (general rules)
The device has 2 distinct ground leads, P-GND (POWER GROUND) and S-GND (SIGNAL GROUND)
which are practically disconnected from each other at chip level. Proper operation requires that P-GND
and S-GND leads be connected together on the PCB-layout by means of reasonably low-resistance
tracks.
As for the PCB-ground configuration, a star-like arrangement whose center is represented by the supply-
filtering electrolytic capacitor ground is highly advisable. In such context, at least 2 separate paths have
to be provided, one for P-GND and one for S-GND. The correct ground assignments are as follows:
STANDBY CAPACITOR, pin 7 (or any other standby driving networks): on S-GND
SVR CAPACITOR (pin 6): on S-GND and to be placed as close as possible to the device.
INPUT SIGNAL GROUND (from active/passive signal processor stages): on S-GND.
SUPPLY FILTERING CAPACITORS (pins 3,13): on P-GND.
The (-) terminal of the electrolytic capacitor has to be directly tied to the battery (-) line and this should
represent the starting point for all the ground paths.
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