UG-072
Evaluation Board User Guide
Rev. A | Page 6 of 20
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.
S3-2
Sets PLL_MODE0.
S3-3
Sets PLL_MODE1.
S3-4
Sets ADDR0.
S3-5
Sets ADDR1.
S3-6
Reserved—set low.
S4
Sets I
2
C or SPI connection to the ADAU1401A.
S5
USBi control connector—I
2
C (left) or SPI (right).
S6
Selects between RCA and optical S/PDIF input.
S7
Unused.
S8
Unused.
LK1 to LK4
Selects which master clock signal is sent to the
PLL of the ADAU1401A.
LK5 to LK6,
LK9 to LK14
Connects the DAC outputs to active (A) or passive
(B) filters.
LK7
Sets the EEPROM write protect pin.
LK8
Selects 3.3 V or 5 V power connected to GPIO
control board.
LK15
Connects the 1.8 V output of the regulator
transistor to DVDD of the ADAU1401A.
LK16
Connects/disconnects 12.288 MHz crystal from
oscillator circuit of the ADAU1401A.
LK17
Connects/disconnects MCLK output to external
circuits. Connecting this may degrade the analog
audio performance of the board.
LK18
Connects 3.3 V to AVDD of the ADAU1401A.
LK19
Writeback trigger input.
LK20
Connects 3.3 V to the
AD8608
op amp.
LK21
Connects 3.3 V to the IOVDD of the ADAU1401A.
LK25
Connects 3.3 V power to serial data buffer.
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.
The functions in Table 2 are available for each of the modes in
Table 3.
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
SW2 Position SDATA_IN0
SDATA_IN1 to
SDATA_IN3
SDATA_OUT0 to
SDATA_OUT3
SPDIF Tx
Clock Master
0
S/PDIF Rx
x
External Output 0 to
External Output 3
SDATA_OUT0 S/PDIF Rx
1
x
x
x
x
ADAU1401A crystal oscillator
2
External Input 0 External Input 1 to
External Input 3
External Output 0 to
External Output 3
SDATA_OUT0 ADAU1401A output
3
S/PDIF Rx
x
x
x
S/PDIF Rx
4 to F
x
x
x
x
x
1
x = no signal is sent to the input pin.
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
