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22 PC/104-Plus – CPU-1461 Module
Aux IN
CD IN
Aux IN
SpkPhone IN/OUT
To J14
CPU Board
Connector
Line IN
Mic IN
Line OUT
SPK OUT
USB 7
USB 8
Figure 10. USB/AC97-AudioCODEC Adapter
Table 12 shows the adapter connectors description.
Table 12. USB/AC97-AudioCODEC Connectors
Connector# Function
J1
USB0
J2
USB1
J3
Microphone IN
J4
Line IN
J5
Speaker OUT
J6
Line OUT
J7
CD IN
J8
Aux IN
J9
Aux IN
J10
Speakerphone IN/OUT
J11
To CPU Board Connector (J4)
This adapter is composed of 2 functional sections:
¾ USB section, with 2 USB ports which are EMI protected and filtered, and can also supply power to the
peripheral device connected (5V, 500mA);
¾ Audio section, which is equipped with the LM4549 National, an AC97 compliant I.C. The AC97
architecture separates the analog and digital functions of the PC audio system allowing both for system
design flexibility and increased performance. The LM4549 is an Audio CODEC for PC systems, which is
fully PC98 compliant and performs the analog intensive functions of the AC97 Rev2.1 architecture. Using
18-bit Sigma-Delta A/D’s and D/A’s, the LM4549 provides 90dB of Dynamic Range.
The Audio section of this board provides 4 stereo inputs, 1 microphone input, 1 stereo line input, 1 stereo
earphone output (200mW) and 1 speakerphone.