Evaluation Board User Guide
UG-284
Rev. 0 | Page 5 of 24
EVALUATION BOARD HARDWARE
POWER SUPPLIES
5V DC INPUT
IOVDD2
FOR
DAI B
IOVDD5
FOR
I
2
C/SPI
IOVDD1
FOR
DAI A
IOVDD4
FOR
DMIC
IOVDD3
FOR
DAI C
SPKVDD
HPVDD
AVDD
DVDD
0
989
9-
00
3
Figure 3. Power Supply
The evaluation board requires an external 5 V dc power adapter
plugged into J34. This 5 V dc input drives the on-board LDOs
to generate 1.5 V, 1.8 V, 2.4 V, 3.3 V, or 3.6 V, which feeds into
the
ADAU1373
and other on-board circuits. The power
supplies the
ADAU1373
requires are listed in Table 1.
Table 1. ADAU1373 Power Supplies
Power Supply
LDO Voltage
AVDD 1.8
V
HPVDD 1.8
V
SPKVDD 3.6
V
DVDD 1.5
V
IOVDD1 to IOVDD5
1.8 V, 2.4 V, or 3.3 V
If voltages other than the default LDO output are needed, external
power supplies can be used for this purpose. Each power supply
for the
ADAU1373
has a set of jumpers to select the LDO
output or external power supply.
J31 is for AVDD power supply selection. The selection options
are shown in Table 2.
Table 2. J31
Jumper
Position
Function
On
On-board LDO-generated 1.8 V connected to AVDD
Off
External power supply connected to Test Pin AVDD
and Test Pin GND
J33 is for HPVDD power supply selection. The selection table is
shown in Table 3.
Table 3. J33
Jumper
Position
Function
On
On-board LDO-generated 1.8 V connected to
HPVDD
Off
External power supply connected to Test Pin HPVDD
and Test Pin GND
J32 is for DVDD power supply selection. The selection options
are shown in Table 4.
Table 4. J32
Jumper
Position
Function
On
On-board LDO-generated 1.5 V connected to DVDD
Off
External power supply connected to Test Pin DVDD
and Test Pin GND
J40 is for SPKVDD power supply selection. The selection
options are shown in Table 5.
Table 5. J40
Jumper
Position
Function
On
On-board LDO-generated 3.6 V connected to
SPKVDD
Off
External power supply connected to SPKVDD: J41
for SPKVDD and J42 for GND
J43 is for IOVDD1 power supply selection, which powers
Digital Audio Interface A. The selection options are shown in
Table 6.
