Sony Ericsson Mobile Communications Inc. TR-505-A2 Manuale Utente
DM15/25 Integrator’s Manual
27 OF 38
6.4
Analog Audio
6.4.1
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).
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).
5V
VANA
12V
VANA
Regulator
B
A