Technical information
Technical Information • SCS-TRUMPET • CPU Expansion Side Card
AUDIO IN/OUT Audio Jacks
The SCS-TRUMPET is equipped with an ALC262 HD Audio Codec, controlled by the PCH (Platform
Controller Hub) on the CPU carrier board via the Intel Azalia HDA link. Two 3.5mm stereo audio jacks
are available from the SCS-TRUMPET front panel for attachment of audio devices such as audio power
amplifier, headphones, microphone.
The particular function of each audio jack is controlled by the driver software (e.g. Realtek). By default,
the AUDIO IN audio jack is configured as microphone input, and the AUDIO OUT jack is suitable for
headphones $32 Ohms. Other configurable options are line in and line out. The typical full scale input
voltage is 1.5V
rms
(input resistance $10kOhm), and the typical full scale output voltage is 1.4V
rms
(10
kOhm / 50pF external load).
The difference between headphones out mode and line out mode is mainly the low output
impedance of 1 Ohm when in HP mode, compared to 200 Ohms in line out mode. This is also useful
for noise immunity when long external audio cables are required. For optimum THD however chose
line out mode.
AUDIO OUT • Stereo Audio Jack
3.5mm (270.50.05.1)
HeadPhones Out
1AGND
2 ALC262 Port E Input/Output Signal Right
3AGND
4AGND
5 ALC262 Port E Input/Output Signal Left
AUDIO IN • Stereo Audio Jack
3.5mm (270.50.05.1)
MIC In
1AGND
2 ALC262 Port F Input/Output Signal Right
3AGND
4AGND
5 ALC262 Port F Input/Output Signal Left
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5
Stereo Audio Jack
3.5mm
270.50.05.1
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EKF • ekf.com
1
2
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4
5
Stereo Audio Jack
3.5mm
270.50.05.1
©
EKF • ekf.com
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