CM-42 Technical Description
PAGE 28 OF 38
SEM/CX-02:0076/DES A
2.3.8.4 Analog Audio Group Recommended Circuitry
2.3.8.4.1
Creating an analog ground
An analog ground plane should be generated, which connects to GND in one point so that high frequency digital
current is not floating through the analog ground. Connecting the analog ground in only one point avoids ground
currents from power supplies and other high current circuitry from creating noise in the analog circuitry. This
common point should be located where the analog supply voltage (VANA) is generated (at filter (A), or regulator (B)
depending on implementation).
Figure 12: Analog Ground Plane Diagram
5V
VANA
12V
VANA
Regulator
B
A
