Sun Microsystems Sun Ultra 60 Service Manual page 205

Audio Card Features
TABLE C–6
Figure Feature
Reference
A Stereo line level
B Stereo microphone input
C Internal CD-ROM peripheral
analog outputs
D Codex mono-output
E Line output
F Headphone output
G MultiMedia Codec
(MMCodec)
The audio card connector is a dual-position, standard-edge connector whose features
include:
4 23 dual positions (46 total)
4 50-millimeter centerline
4 1.49 inches (total length)
The audio connector supports the following:
4 Nine Codec address lines
4 Eight Codec data lines
Description
Attenuated by a resistor divider network and
then fed into the Line Inputs of the Codec.
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.
Cabled to the motherboard and AC-coupled
to the left and right Aux1 inputs of the
Codec.
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.
A direct output, except E1, which enables
muting of this signal. The mute function is
driven from the Codec PIO lines.
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.
Heart of the audio module. A single-chip,
stereo, A/D and D/A converter based on
delta-sigma conversion.
Functional Description
C-25