Loudspeaker Circuit; Figure 21: Differential Loudspeaker Configuration; Figure 22: Single Ended Loudspeaker Configuration - Siemens TC65 Hardware Interface Description
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TC65 Hardware Interface Description
Strictly confidential / Draft
3.13.3
Loudspeaker Circuit
The GSM module comprises two analog speaker outputs: EP1 and EP2. Output EP1 is able
to drive a load of 8Ohms while the output EP2 can drive a load of 32Ohms. Each interface
can be connected in differential and in single ended configuration. See examples in Figure
21 and Figure 22.
EPPx
GSM module
EPNx
AGND
Figure 21: Differential loudspeaker configuration
EPPx
GSM module
EPNx
AGND
Figure 22: Single ended loudspeaker configuration
TC65_HD_V00.521
+
C
k
Page 58 of 99
s
Loudspeaker impedance
EPP1/EPN1
Z
= typ. 8Ohm
L
EPP2/EPN2
Z
= typ. 32Ohm
L
Loudspeaker impedance
EPP1/EPN1
Z
= typ. 8Ohm
L
C
= 220µF
k
EPP2/EPN2
Z
= typ. 32Ohm
L
C
= 47µF
k
24.05.2005
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