UG-1134 EVAL-ADAU1467Z
Rev. A (Draft) | Page 14 of 55
EVALUATION BOARD FEATURES
The E VAL -ADAU1467Z provides access to the master and slave
control ports, multipurpose pins, auxiliary ADCs, S/PDIF
interfaces, and serial ports of the ADAU1467 as well as the
AD1337 CODEC.
RESET
To manually reset the ADAU1467 and AD1937, press and
release the RESET push-button, S1 (see Figure 35). A reset
generator circuit toggles the reset pins on the ADAU1467 and
AD1937 to perform a full hardware reset of both devices.
Figure 35. Manual Reset Push-Button
To generate a reset in software, right click in the empty white
border of the USB Interface block in the Hardware Configuration
tab, and then choose Device Enable/Disable from the menu that
appears (see Figure 36). Performing this action sets the system
reset signal to logic low.
Figure 36. Toggling the Reset Signal in SigmaStudio
AD1937 CODEC
One of the four serial input ports and one SDATAIOx pin are
connected to the ADCs of the AD1937, and one of the four
serial output ports and three SDATAIOx pins are connected to
the digital-to-analog converts (DACs) of the AD1937. Each
serial data pin carries two channels of serial audio in I
2
S format,
for a total of four channels of analog audio input and eight
channels of analog audio output.
Stereo Line Inputs
Two stereo input jacks allow four, single-ended, line level, analog
input signals. The AD1937 ADC inputs are configured such that
the full scale is 2.8 V p-p, which is approximately 1 V rms for a
sine wave. Any signal that exceeds 2.8 V p-p at the audio jack is
clipped, which creates distortion. The signals are fed to active
low-pass filters and converted to differential pairs before reaching
the ADCs of the AD1937. The filters are designed for a system
sample rate of 44.1 kHz or 48 kHz.
The stereo input jacks accept standard stereo TRS 3.5 mm
(1/8 inch) mini plugs (tip connected to left, ring connected to
right, sleeve connected to ground) with two channels of audio
(see Figure 37).
Figure 37. Standard Stereo TRS 1/8 Inch Mini Audio Plug and Cable
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