UG-1135
Rev. 0 | Page 18 of 45
USING THE EVALUATION BOARD
POWER SUPPLY
Power is supplied to the evaluation board using a dc power
supply with a female positive center plug. The plug has a 2.1 mm
inner diameter, a 5.5 mm outer diameter, and a 9.5 mm length
(see Figure 59). The output must range between 5 V and 7 V
and must be able to source at least 1.5 A of current. Connect the
power supply to Connector J4. The unregulated supply powers
the operational amplifiers used in the active audio filters for the
analog audio inputs and outputs. An on-board linear regulator
(U5) generates the 3.3 V dc supply required for the
and
, as well as other supporting ICs. When the power
supply is connected properly, LED D2 (A_3V3) illuminates.
15
789-
05
4
Figure 59. DC Power Supply Plug and Cable
INPUTS AND OUTPUTS
The EVAL-ADAU1466Z provides access to the serial ports,
S/PDIF interfaces, multipurpose pins, and auxiliary analog-to-
digital converters (ADCs) of the
Codec
Two of the four serial input ports are connected to the ADCs of
the
, and all four of the serial output ports are connected
to the digital-to-analog converters (DACs) of the
, for a
total of four channels of analog audio input and eight channels
of analog audio output.
is hardwired in standalone mode, and its serial
ports are configured as clock slaves. Therefore, the corresponding
serial ports on the
must be set as clock masters. By
default, all serial ports on the
are set as clock masters
when a new project is created in
Standalone mode eliminates the need and ability of the user to
configure the registers of the
fixes the sample rate of the
at 44.1 kHz or 48 kHz. It is
not possible to change this setting. Even though the
is flexible and can run at any sample rate up to 192 kHz, the analog
audio inputs and outputs on the EVAL-ADAU1466Z can be
distorted or silent if a sample rate other than 44.1 kHz or 48 kHz is
used for the
serial ports.
Stereo Line Inputs
Two stereo input jacks allow four, single-ended, line level, analog
input signals. The
ADC inputs are configured such that
the full scale is 2.8 V p-p, which is ~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
. 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 60).
15
879-
05
5
Figure 60. Standard Stereo TRS 1/8 Inch Mini Audio Plug and Cable
The signals pass through the
ADCs and then are sent
to the
serial input ports in I
2
S format. The mapping
of input signals to input channels in
is shown in Table 2.
Table 2. Mapping of Stereo Analog Input Signals to
Input Jack
Plug Contact
ADC Pins
Serial Input Pins
Input Channel in
J9 Left
(tip)
ADC1LN,
ADC1LP
SDATA_IN0
0
J9
Right (ring)
ADC1RN, ADC1RP
SDATA_IN0
1
J7 Left
(tip)
ADC2LN,
ADC2LP
SDATA_IN1
16
J7
Right (ring)
ADC2RN, ADC2RP
SDATA_IN1
17
Содержание EVAL-ADAU1466Z
Страница 37: ...EVAL ADAU1466Z User Guide UG 1135 Rev 0 Page 37 of 45 15789 087 Figure 96 EVAL ADAU1466Z Layout Top Assembly ...
Страница 38: ...UG 1135 EVAL ADAU1466Z User Guide Rev 0 Page 38 of 45 15789 088 Figure 97 EVAL ADAU1466Z Layout Top Copper ...
Страница 39: ...EVAL ADAU1466Z User Guide UG 1135 Rev 0 Page 39 of 45 15789 089 Figure 98 EVAL ADAU1466Z Layout Ground Plane ...
Страница 40: ...UG 1135 EVAL ADAU1466Z User Guide Rev 0 Page 40 of 45 15789 090 Figure 99 EVAL ADAU1466Z Layout Power Plane ...
Страница 41: ...EVAL ADAU1466Z User Guide UG 1135 Rev 0 Page 41 of 45 15789 091 Figure 100 EVAL ADAU1466Z Layout Bottom Copper ...
