Auxiliary Audio From Wireless Cpu (Auxo) - Wavecom GR64 GSM/GPRS Integrator's Manual

5.9.2

Auxiliary Audio from Wireless CPU (AUXO)

AUXO is a single-ended auxiliary analogue audio output from the Wireless CPU and
may be used to drive a speaker or an earpiece. The interface has an internal 100nF
coupling capacitor; a load of 10kohm will provide a near full-scale output capability
between 300 to 4300 Hz.
Figure 16: Auxiliary output connections to the Wireless CPU
The table below shows the audio signal levels for AUXO.
Parameter
Output voltage full scale
Frequency response HPF
GR64 Integrators Manual
Page: 53/104
Conditions
RL =10kΩ
-3dB cut-off (RL =10kΩ)
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Min Typ Max
670 750 840 mVrms
160
Unit
Hz