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UG-072
SWITCH AND JUMPER FUNCTIONS
This evaluation board has many switches and jumpers; however,
for most applications, many of these need to be set only once
and can be ignored after that. Table 1 shows the function of
each jumper and switch on the evaluation board. For the S3
switch package, logic high (1) is left and logic low (0) is right,
assuming analog connectors are the top of the board.
Table 1. Switches and Jumpers
Reference
Designator Function
S1 Resets evaluation board.
S2 Signal routing mode select.
S3-1 Sets SELFBOOT.
Evaluation Board User Guide
ROTARY SWITCH SETTINGS
S2 is a hex rotary switch that controls the input and output
signal routing on the evaluation board. The position of this
switch controls which serial data signals and clocks will be
routed to and from the ADAU1401A. Table 3 shows the settings
of Rotary Switch S2. This switch controls the routing of digital
signals to and from the ADAU1701 / ADAU1702 (U1) serial
input and output ports. Table 3 indicates which serial data
signals and clocks are sent to each of the four serial data inputs,
as well as to where the output signals of the serial port are
routed. An x in the table indicates that no signal is sent to that
input pin on the ADAU1701/ ADAU1702 in that mode. Switch
Position 4 to Switch Position F are unused.
S3-2
S3-3
S3-4
S3-5
S3-6
S4
S5
S6
S7
S8
LK1 to LK4
LK5 to LK6,
LK9 to LK14
LK7
LK8
LK15
LK16
LK17
LK18
LK19
LK20
LK21
LK25
Sets PLL_MODE0.
Sets PLL_MODE1.
Sets ADDR0.
Sets ADDR1.
Reserved—set low.
Sets I 2 C or SPI connection to the ADAU1401A.
USBi control connector—I 2 C (left) or SPI (right).
Selects between RCA and optical S/PDIF input.
Unused.
Unused.
Selects which master clock signal is sent to the
PLL of the ADAU1401A.
Connects the DAC outputs to active (A) or passive
(B) filters.
Sets the EEPROM write protect pin.
Selects 3.3 V or 5 V power connected to GPIO
control board.
Connects the 1.8 V output of the regulator
transistor to DVDD of the ADAU1401A.
Connects/disconnects 12.288 MHz crystal from
oscillator circuit of the ADAU1401A.
Connects/disconnects MCLK output to external
circuits. Connecting this may degrade the analog
audio performance of the board.
Connects 3.3 V to AVDD of the ADAU1401A.
Writeback trigger input.
Connects 3.3 V to the AD8608 op amp.
Connects 3.3 V to the IOVDD of the ADAU1401A.
Connects 3.3 V power to serial data buffer.
The functions in Table 2 are available for each of the modes in
Table 2. S2 Settings
Mode Function
0 Inputs: S/PDIF, analog
Outputs: S/PDIF, analog, serial data (slave)
1 Inputs: analog, serial data
Outputs: analog, serial data (master or slave)
2 Inputs: analog, serial data
Outputs: S/PDIF, analog, serial data (master)
3 Inputs: S/PDIF, analog
Outputs: analog
The multipurpose pins of the ADAU1401A must be set into
serial data I/O modes to use the board’s digital I/O.
Table 3. S2 Settings 1
SDATA_IN1 to
SDATA_OUT0 to
SW2 Position
0
1
2
SDATA_IN0
S/PDIF Rx
x
External Input 0
SDATA_IN3
x
x
External Input 1 to
SDATA_OUT3
External Output 0 to
External Output 3
x
External Output 0 to
SPDIF Tx
SDATA_OUT0
x
SDATA_OUT0
Clock Master
S/PDIF Rx
ADAU1401A crystal oscillator
ADAU1401A output
External Input 3
External Output 3
3
4 to F
S/PDIF Rx
x
x
x
x
x
x
x
S/PDIF Rx
x
1
x = no signal is sent to the input pin.
Rev. A | Page 6 of 20
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