Eurotech Appliances CPU-1461 Aux IN CD IN, SpkPhone IN/OUT, To J14 CPU Board Connector, Mic IN

22 PC/104-Plus – CPU-1461 Module

Aux IN

CD IN

Aux IN SpkPhone IN/OUT

To J14

CPU Board

Connector

Mic IN Line IN Line OUT SPK OUT USB 8 USB 7

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:

¾USB section, with 2 USB ports which are EMI protected and filtered, and can also supply power to the peripheral device connected (5V, 500mA);

¾Audio 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.