5.9.1 Auxiliary Audio To Mobile Station (AUXIP, AUXIN)
AUXI is a differential auxiliary analogue audio input to the wireless modem. Internally, the signal is routed to the CODEC (COder/DECoder), where it is converted to digital audio and mapped to an internal bus.
All sources must be
The AUXI input is a passive network followed by the transmit part of the CODEC.
| Parameter |
|
| Conditions |
| Min |
|
| Typ |
|
| Max |
|
|
| Unit |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Input voltage full scale |
|
| max input gain |
| 142 |
|
| 158 |
|
| 178 |
|
|
| mVrms |
|
|
| min input gain |
| 447 |
|
| 501 |
|
| 564 |
|
|
| mVrms | |
|
|
|
|
|
|
|
|
| ||||||||
| Frequency response |
|
|
| 300 |
|
|
|
|
| 3400 |
|
|
| Hz | |
| Output dc bias level |
|
|
|
| 2.16 |
|
| 2.4 |
|
| 2.64 |
|
|
| V |
| AC coupling capacitance |
|
|
| 1 |
|
|
|
|
|
|
|
|
| ∝F | |
5.9.2 Auxiliary Audio From Mobile Station (AUXOP, AUXON)
The auxiliary output is a differential analogue audio output from the wireless modem 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
The table below shows the audio signal levels for AUXO.
Parameter |
| Conditions |
| Min |
| Typ |
| Max |
| Unit |
|
|
|
|
|
|
|
|
|
|
|
Output voltage full scale |
| RL =10kΩ |
| 670 |
| 750 |
| 840 |
| mVrms |
Frequency response |
| 225 |
|
|
|
|
| Hz | ||
LZT 123 1836 | 49 |