Adc Interface - Analog Devices EZ-Board ADSP-BF518F Manual

The control interface of the codec is via a 2-wire interface (TWI).
Mic gain values of 14 dB, 0 dB, or –6 dB are selectable through switch
. For more information, see "MIC Gain/Loopback Switch (SW5)" on
SW5
page 2-10.
Microphone bias is provided through a low-noise reference voltage. A
jumper on positions 2&3 of
jack. Placing a jumper on positions 1&2 of
to the mic signal.
on page 2-16.
and are 3.5 mm connectors for the audio portion of the board.
J4 J5
connects the mic on the top portion and line-in on the bottom.
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
signals are looped back inside the connector.
"Dual Audio Connectors (J4–5)" on page 2-22.
For testing,
SW15
phone. positions 5 and 6 loop the output of the codec to the input
SW5
when no cables are connected to
"SPORT0 ENBL Switch (SW15)" on page 2-12.
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
ADSP-BF518F EZ-Board Evaluation System Manual
connects the
JP15
For more information, see "MIC Select Jumper (JP15)"
position 4 connects the
J4
Using ADSP-BF518F EZ-Board
MICBIAS
connects the bias directly
JP15
For more information, see
signal to the right head-
MICIN
and . For more information, see
J5
signal to the audio
J5
con-
J4
or , the
J4 J5
1-17