ADC Interface
1-18
ADSP-BF518F EZ-Board Evaluation System Manual
J4
and
J5
are 3.5 mm connectors for the audio portion of the board.
J5
connects the mic on the top portion and line-in on the bottom.
J4
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
J4
or
J5
, the
signals are looped back inside the connector.
“Dual Audio Connectors (J4–5)” on page 2-26.
For testing,
SW6
positions 1&2 connect the
MICIN
signal to either the left
or right headphone. Do not connect the left and right to the
MICIN
signal
at the same time—only position 1 or 2 of
SW6
should be
ON
at the same
time.
For more information, see “Mic/HP LPBK, Audio Mode Switch
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.
ADC Interface
The ADC interface of the EZ-Board consists of a dual, 12-bit, high-speed,
low-power, successive approximation analog-to-digital converter. The
device contains two converters, each preceded by a 3-channel multiplexer,
a low-noise, wide-bandwidth track, and holds an amplifier that can handle
input frequencies in excess of 30 MHz. There are four differential and
four single-ended inputs on the EZ-Board that are accessed via SMA
connectors.
The ADC connects to the ADSP-BF518F processor via the processor’s
serial port 1.
SPORT1
is disconnected from the ADC by turning switch
SW4
OFF
, which enables
SPORT1
for the expansion interface II or for the
multi-function pins, in which case the port’s signals can be used for the
RSI or as push buttons. See
“SPORT1 Enable Switch (SW4)” on page 2-9
for more information.
