Arcom VIPER - Audio

VIPER Detailed hardware description
Audio
A National Semiconductor LM4548A AC’97 audio CODEC is used to support the audio
features of the VIPER. Audio inputs supported by the LM4548A are stereo line in and a
mono microphone input.
The LM4548A provides a stereo line out that can also be amplified by a National
Semiconductor LM4880 250mW per channel power amplifier, suitable for driving an 8Ω
load. The LM4548A AC’97 codec may be turned off if it is not required. See the section
Audio power management
, page 58, for details.
Connection to the VIPER Audio features is via header PL6. See the table below for pin
assignments and the section PL6 – Audio connector
, page 65, for connector and mating
connector details.
Function Pin Signal Signal levels (max)
10 MIC
Microphone
7 Audio ground reference.
1Vrms input
1 Line input left
5 Line input right
Line in
3 Audio ground reference
1Vrms input
2 Line output left
6 Line output right
Line out
4 Audio ground reference
1Vrms output
8 Amp output left
11 Amp output right
Amp out
12 Audio ground reference
1.79Vpeak output,
1.26Vrms output (8Ω load)
223mW
© 2004 Arcom Issue H 38