Analog Devices EVAL-ADAU1466Z, User Manual

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UG-1135 EVAL-ADAU1466Z User Guide
Rev. 0 | Page 20 of 45
Table 3. Mapping of SigmaStudio Channels to Output Jacks
Output Jack Plug Contact AD1938 DAC Pin ADAU1466 Serial Output Pin Output Channel in SigmaStudio
J10 Left (tip) OL1 SDATA_OUT0 0
J10 Right (ring) OR1 SDATA_OUT0 1
J8 Left (tip) OL2 SDATA_OUT1 16
J8 Right (ring) OR2 SDATA_OUT1 17
J6 Left (tip) OL3 SDATA_OUT2 32
J6 Right (ring) OR3 SDATA_OUT2 33
J5 Left (tip) OL4 SDATA_OUT3 40
J5 Right (ring) OR4 SDATA_OUT3 41
Standard headers with 0.1 inch (2.54 mm) spacing, provide
connections from external sources. The J2 and J3 headers each
comprise two columns and three rows of pins. There is one
signal column and one ground column. Always connect at least
one ground wire between the header and the external signal
source to maintain proper signal integrity. A standard ribbon
cable provides signal integrity over longer distances because
signal wires are separated by ground wires (see Figure 63).
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058
Figure 63. Connecting External I 2 S Signals to Serial Input Port 2
The signals passing between the ADAU1466 serial output ports
and the AD1938 DAC are also accessible via the test points that
are situated between the two ICs. Signals can be tapped from
these test points and connected to external digital audio sinks, if
desired (see Figure 64). When connecting these signals to external
devices, connect at least one ground signal to maintain signal
integrity.
157
89-
059
Figure 64. Test Points for Monitoring Digital Audio Signals
MULTIPURPOSE (MP) PINS
The multipurpose pins on the ADAU1466 can be used for general-
purpose inputs or outputs when configured as such using the
ADAU1466 control registers. Of the 14 multipurpose pins, three
are connected to switches that pull them low or tie them high,
three are on test points and connected to high impedance inputs
to LED drivers, and two are available headers. The remaining
six pins are used for other functionality and are, therefore,
unavailable for use as multipurpose pins.
The signal from the LRCLK_OUT1/MP5 pin is fed to an inverter
that drives LED D4. The signal from the LRCLK_OUT3/MP9 pin
is fed to an inverter that drives LED D3. The signal from the
LRCLK_IN1/MP11 pin is fed to an inverter that drives LED D5.
The five multipurpose pins available for use as general-purpose
inputs or outputs, along with their access points on the evaluation
board, are described in Table 4.