Sun Microsystems 60 service manual Audio Card and Connector, Table C-6Audio Card Features

C.1.13	Audio Card and Connector
	The audio card provides various audio applications from telephone-quality speech
	to CD-quality music. The audio card supports four jacks of identical type: line in,
	line out, headphone out, and microphone in. TABLE C-6lists the major features of the
	audio card and FIGURE C-9illustrates a functional block diagram.
	TABLE C-6Audio Card Features
	Figure
	Reference	Feature	Description
	A	Stereo line level	Attenuated by a resistor divider network and
			then fed into the Line Inputs of the Codec.
	B	Stereo microphone input	Buffered by a non-inverting operational
			amplifier (one operational amplifier for the
			left channel and one operational amplifier for
			the right channel). The left and right outputs
			are then fed into the left and right Mic Inputs
			of the Codec. A filtered +5 Vdc is fed to the
			signal inputs.
	C	Internal CD-ROM	Cabled to the motherboard and AC-coupled
		peripheral analog outputs	to the left and right Aux1 inputs of the Codec.
	D	Codex mono-output	Fed into an active graphic equalizer to add
			bass boost and mid-range attenuation.
			Equalizer output is amplified and routed to
			the front mounted 16-ohm, 68-mm speaker.
	E	Line output	A direct output, except E1, which enables
			muting of this signal. The mute function is
			driven from the Codec PIO lines.
	F	Headphone output	Buffered by an operational amplifier to give
			headphone drive with low impedances of 16
			ohms or more. Is independently mutable,
			driven from Codec PIO lines.
	G	MultiMedia Codec	Heart of the audio module. A single-chip,
		(MMCodec)	stereo, A/D and D/A converter based on
			delta-sigma conversion.

The audio card connector is a dual-position, standard-edge connector whose features include:

■23 dual positions (46 total)

■50-millimeter centerline

■1.49 inches (total length)

C-28Sun Ultra 60 Service Manual • August 2001