Analog Devices EVAL-ADuCM355QSPZ, Manual

Page: 4 / 24

UG-1308 EVAL-ADuCM355QSPZ Evaluation Board
Rev. A | Page 4 of 24
POWER CONFIGURATIONS
This section describes the four different options to power the
EVAL-ADuCM355QSPZ. The different power options include
the following:

Power via a microUSB connector, P4, and the on-
board
ADP7158 low dropout (LDO) regulator, which
is the default power option.

Connect 3.3 V to the AVDD and DVDD connectors.
This setup is useful for measuring the current
consumption of the EVAL-ADuCM355QSPZ via the
current meter.

Power via the 8-pin P27 debug header (a different
USB connection option to the PC).

Power via an external 5 V supply to the 2-pin JP37
connector. Optionally, an external 5 V supply can
power the
ADP7158 instead of the USB using this
setup.
MicroUSB DIRECT POWER VIA P4 AND ADP7158
LDO REGULATOR
To power the EVAL-ADuCM355QSPZ via the P4 microUSB
connector, take the following steps:
1. Ensure that the JP40 and JP42 to JP46 jumpers are
inserted. These jumpers control the features shown in
Table 1.
2. Remove the JP37 jumper.
Table 1. Jumper Connections
Jumper Description
JP45 and
JP46 Connect the UART pins from the ADuCM355 to the
UART to USB transceiver chip (U2) (see Figure 3).
JP40
Connects the 5 V USB supply to the LDO input (U3)
(see Figure 4).
JP42 Connects the 3.3 V LDO output to the EVAL-
ADuCM355QSPZ power supply filters (see Figure 4).
JP43 and
JP44 Connect the DVDD and AVDD rails to filters for the
DVDD and AVDD analog supplies to the
ADuCM355
(see Figure 4).
168
87-
002
Figure 2. Direct Power via MicroUSB Cable