GR64 Integrators Manual
Page: 52/104
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5.9.1
Auxiliary Audio to Wireless CPU (AUXI)
AUXI is a single-ended auxiliary analogue audio input to the Wireless CPU. Internally,
the signal is routed to the CODEC (Coder/DECoder), where it is converted to digital
audio and mapped to an internal bus.
Figure 15: Auxiliary input connections to the Wireless CPU
The AUXI input is a passive network applying -5dB of gain followed by the transmit
part of the CODEC.
Parameter
Conditions
Min
Typ
Max
Unit
max input gain
142
158
178
mVrms
Input voltage full scale
min input gain
447
501
564
mVrms
Frequency response
-3dB cut-off
340
3400
Hz
AC input impedance
300-3400 Hz
100
kohm
