Analog Devices Lite ADSP-BF527 EZ-KIT, Manual

Page: 44 / 117

USB OTG Interface
1-20 ADSP-BF527 EZ-KIT Lite Evaluation System Manual
Microphone bias is provided through a low-noise reference voltage. A
jumper on position 2 and 3 of
JP6
connects the
MICBIAS
to the audio jack.
Placing the jumper on positions 1 and 2 of
JP6
connects the bias directly
to the mic signal. Refer to “MIC Select Jumper (JP6)” on page 2-22 for
more information.
J7
and
J8
are 3.5 mm connectors for the audio portion of the board.
J7
connects the mic on the top portion and line-in on the bottom.
J8
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
J7
or
J8
, the signals
are looped back inside the connector.
For testing purposes,
SW8
positions 1 and 2 allow the
MICIN
signal to be
connected to either the left or right headphone. Do not connect both left
and right to the
MICIN
signal at the same time—only position 1 or 2 of
SW8
should be
ON
at the same time. Refer to “Mic/HP LPBK Audio Mode
Switch (SW8)” on page 2-14 for more information.
For more information, see “Dual Audio Connectors (J7–8)” on page 2-28 .
The EZ-KIT Lite is shipped with a headphone and multiple 3.5 mm
cables, which allow you to run the example programs provided in the
EZ-KIT Lite installation directory and learn about the audio interface.
USB OTG Interface
The ADSP-BF527 processor has a built-in, high-speed USB on-the-go
(OTG) interface and integrated PHY. The interface connects to a
24 MHz clock (
U12
), has surge protection, and can be configured as a host
or device. When in device mode, the USB 5V regulator (
VR3
) and FET
switch (
U28
) are turned
OFF
. When in host mode, the USB 5V regulator
and FET are turned
ON
and can supply 5V at 500 mA.
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