CM-42 Technical Description
PAGE 31 OF 38
SEM/CX-02:0076/DES A
2.3.8.4.5
Loudspeaker path
An application using the analog audio interface must re-reference the AFMS-signal from AGND to its own internal BIAS. The
figure shows a differential implementation. C1 is chosen to create the correct HP frequency response. R1 and R2 determine
the gain, and C2 and R2 determine the LP frequency response.
Figure 15: Loudspeaker Diagram
0
-
+
0
R1
>=10k
R1
>=10k
R2
R2
C1
C1
C2
C2
BIAS
AFMS
AGND
Internal App +
Internal App -
