Audio Card And Connector; Table C-6 Audio Card Features - Sun Microsystems Ultra 60 Service Manual

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.
audio card and
TABLE C-6
Figure
Reference
A
B
C
D
E
F
G
The audio card connector is a dual-position, standard-edge connector whose features
include:
C-28 Sun Ultra 60 Service Manual • August 2001
FIGURE C-9
Audio Card Features
Feature
Stereo line level
Stereo microphone input
Internal CD-ROM
peripheral analog outputs
Codex mono-output
Line output
Headphone output
MultiMedia Codec
(MMCodec)
23 dual positions (46 total)
50-millimeter centerline
1.49 inches (total length)
TABLE C-6
illustrates a functional block diagram.
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.
lists the major features of the