ADSP-BF526 EZ-Board Evaluation System Manual
1-23
Using The ADSP-BF526 EZ-Board
Mic gain values of 14 dB, 0 dB, or –6 dB are selectable through the
SW9
switch by turning
ON
position 1, 2, or 3 (respectively). All other positions
must be
OFF
to achieve the desired gain.
For more information, see “MIC
Gain Switch (SW9)” on page 2-12.
Microphone bias is provided through a low-noise reference voltage. A
jumper on positions 2 and 3 of
JP6
connects the
MICBIAS
signal to the
audio jack. Placing a jumper on positions 1 and 2 of
JP6
connects the bias
directly to the mic signal.
For more information, see “MIC Select Jumper
J3
and
J4
are 3.5 mm connectors for the audio portion of the board.
J4
connects the mic on the top portion and line-in on the bottom.
J3
con-
nects the headphone on the top portion and line-out on the bottom. If
there is no 3.5 mm cable plugged into the bottom of either
J3
or
J4
, the
signals are looped back inside the connector.
“Dual Audio Connectors (J3–4)” on page 2-31.
For testing,
SW10
positions 1 and 2 connect the
MICIN
signal to either the
left or right headphone. Do not connect the left and right to the
MICIN
sig-
nal at the same time—only position 1 or 2 of
SW10
should be
ON
at the
same time.
For more information, see “Audio LPBK (Loopback) Switch
SW10
disconnect the line in
from line out loopback.
The EZ-Board is shipped with two 3.5 mm cables, which allow you to run
the example programs provided in the EZ-Board installation directory and
learn about the audio interface.
USB OTG Interface
The ADSP-BF526 processor has a built-in, high-speed USB OTG inter-
face and integrated PHY. The interface connects to a 24 MHz crystal (
Y2
),
has a surge protector, and can be configured as a host or a device. When in