Push Buttons and Switches
2-18
ADSP-21479 EZ-Board Evaluation System Manual
Headphone Enable Switch (SW23)
The headphone enable switch (
SW23
) connects the AD1939’s
OUT3
circuit
to the 3.5 mm headphone connector (
J8
). By default, the headphone
enable switch is disabled. To use the headphones, set
SW23
to all
ON
.
more information, see “Headphone Out Connector (J8)” on page 2-26.
Audio Loopback Switches (SW24–25)
The audio loopback switches (
SW24
and
SW25
) are used for testing only.
The switches loop back any analog signal generated from the AD1939’s
digital-to-analog converter (DAC) circuit to analog-to-digital converter
(ADC) circuit.
SW19.5
ON
OFF
SW19.6
ON
ON
SW19.7
ON
OFF
SW19.8
ON
ON
SW20.1
ON
OFF
SW20.2
OFF
OFF
SW21.1
OFF
OFF
SW21.2
ON
ON
SW22.1
OFF
ON
SW22.2
ON
OFF
Table 2-17. Multiple-Processor Configuration (Cont’d)
Switch Position
Main EZ-Board
Attached to Emulator
EZ-Board(s)
Not Attached to Emulator