Eurotech Appliances CPU-1461 - Manual (Page 22)

22 PC/104-Plus – CPU-1461 Module
Aux IN
CD IN
Aux IN SpkPhone IN/OUT
To J14
CPU Board
Connector
Lin
e IN
Mic
IN
Lin
e
OUT
SPK
OU
T
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.