UG-1135
Rev. 0 | Page 19 of 45
Stereo Line Outputs
Four stereo output jacks allow eight line level analog output signals.
The
DAC outputs are configured such that a full-scale
signal is 2.8 V p-p at the jack, which is approximately 1 V rms
for a sine wave. The signals output from the DACs are fed to active
low-pass filters and then ac-coupled before reaching the output
jacks. The filters are designed for a system sample rate of
44.1 kHz or 48 kHz.
The output filters are designed to drive high impedance loads,
for instance, loads from active speakers. Some low impedance
loads, for example, loads from headphones, can also be driven
by these outputs. However, very low impedance loads, for example,
loads from passive speakers, cannot be driven by these outputs.
The stereo output jacks accept standard stereo TRS 1/8 inch mini
plugs (tip connected to left, ring connected to right, sleeve
connected to ground) with two channels of audio (see Figure 60).
The signals pass from the
serial outputs in I
2
S
format to the
DACs, where they are converted to
analog signals and sent through the output filters to the output
jacks. The mapping among the
output channels,
output serial ports, and output jacks is shown in Table 3.
S/PDIF Optical Transmitter and Receiver
S/PDIF interfaces are connected directly to
optical transmitter and receiver connectors, which convert the
electrical signals to and from optical signals, respectively. The
connectors accept standard TOSLINK connectors and optical
fiber cables (see Figure 61).
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789-
05
6
Figure 61. TOSLINK Connector and Optical Fiber Cable
for S/PDIF Input and Output
S/PDIF receiver accepts signals with sample
rates between 18 kHz and 192 kHz. Because the incoming signal
is asynchronous to the system sample rate, an ASRC must be
used to convert the sample rate of the incoming signal. Optionally,
the
core can be configured to start processing audio
samples based on the sample rate of the incoming S/PDIF receiver
signal, meaning that no ASRC is required. However, using an
ASRC is strongly recommended for performance and reliability
reasons.
The
S/PDIF transmitter typically transmits signals
from the DSP core, meaning that the sample rate of the audio
coming out of the S/PDIF transmitter on the EVAL-ADAU1466Z
is typically 44.1 kHz or 48 kHz. Optionally, the S/PDIF transmitter
can be configured in a pass through mode, where it simply trans-
mits a copy of the signal directly from the receiver.
Both the S/PDIF receiver and transmitter carry two channels of
uncompressed audio.
Serial Audio Interface
Two of the four
serial input ports are connected to
the
is in standalone mode, the
device always drives the SDATA_IN0 and SDATA_IN1 pins of
the
. As a result, external data signals cannot be
input to SDATA_IN0 or SDATA_IN1.
However, the remaining two serial input ports (SDATA_IN2
and SDATA_IN3, along with their corresponding clock pins,
BCLK_IN2, LRCLK_IN2/MP12, BCLK_IN3, and LRCLK_IN3/
MP13), are accessible directly via the J2 and J3 headers (see
Figure 62).
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-057
Figure 62. Serial Input Port 2 and Serial Input Port 3 Signal Access Headers
Содержание EVAL-ADAU1466Z
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