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AC75 Hardware Interface Description
Strictly confidential / Preliminary
3.15.3
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. Figure 27 shows an
example of a differential loudspeaker configuration.
EPPx
GSM module
EPNx
AGND
Figure 27: Differential loudspeaker configuration
AC75_HD_V00.202
Page 68 of 120
s
Loudspeaker impedance
EPP1/EPN1
Z
= typ. 8Ohm
L
EPP2/EPN2
Z
= typ. 32Ohm
L
27.04.2006
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