Evaluation Board User Guide
UG-059
Rev. 0 | Page 3 of 12
FUNCTIONALITY OVERVIEW
The evaluation board for the
AD5501
/
AD5504
allows the user
to fully evaluate all the functions and performance of the AD5501/
AD5504 prior to designing it into a system. The evaluation
board can be used in a standalone mode with the control
signals provided through the 10-pin header, J6, or it can be
connected to a PC using the USB cable supplied with the
evaluation board kit. Software is provided that allows the user
to program the various registers of the AD5501/AD5504 with
ease. The operation of the software is described in the Using the
USB Software section.
SAFETY REQUIREMENTS
Because the AD5501/AD5504 are capable of producing voltages
up to 60 V, the evaluation board is shipped with a perspex cover
on the top and bottom. This cover should remain in place to
prevent accidental contact with any high voltage components
or tracks.
POWER SUPPLIES
To supply V
LOGIC
, the evaluation board requires a 2.7 V to 5 V
supply. The V
DD
supply can be any value within the power
supply limit as specified in the AD5501/AD5504 data sheets.
Power supply connections are made to the banana sockets of
J2 to J5. The USB interface, if used, gets its power supply from
the USB port of the PC. This power supply is not used by the
AD5501/AD5504 or any of its associated circuitry. When
connecting the power supply leads, it is recommended that
the supplies be turned off and that the ground leads be
connected first.
DAC OUTPUTS
The DAC output for the AD5501 is available on the SMB
connector, T1. The DAC outputs V
OUTA
to V
OUTD
for the
AD5504 are available on the SMB connectors, T1 to T4.
USB INTERFACE
The software provided with the evaluation board kit allows
the user to program the registers of the AD5501/AD5504 via
the USB interface. It is important that the software supplied
is installed on the PC before the board is connected. The USB
circuitry gets its power from the USB port of the PC and gene-
rates the required interface signals: CLR, SYNC, and SCLK to
control the AD5501/AD5504. To use the interface Link LK1
should be inserted.
STANDALONE OPERATION
The evaluation board can be used as a standalone device if
required. The advantage to this is that it lets the user connect
the interface pins of the AD5501/AD5504 to their own DSP or
microcontroller, thus allowing them to write code to operate the
AD5501/AD5504 as their application requires. To use the board
in standalone mode, the connection to the USB interface must
be removed. This is achieved by removing LK1, which three-
states the connections to CLR, LDAC, SYNC, SCLK
and SDI. LK10 should be in Position B or Position C so that
the R_SEL pin is connected to DGND or V
LOGIC
as required.
The interface signals required to control the AD5501/AD5504
can then be provided through the 10-pin header, J6. The pinout
of J6 is shown in
.
Table 1
Table 1. J6 Header Pinout
Pin Signal
Pin Signal
1
CLR
6 SDO
2
SYNC
7
R_SEL
3 SCLK
8 ALARM
4 SDI
9 DGND
5
LDAC
10 DGND
Table 2. Summary of Link Positions
Link Description
LK1
This link determines if the USB interface is to be used.
If this link is inserted, the USB interface generates the signals required to control the AD5501/AD5504.
If this link is removed, the USB interface is not used, and Header J3 must be used to provide signals to the AD5501/AD5504.
LK2
This link connects the V
LOGIC
pin of the AD5501/AD5504 to the V
LOGIC
source. This link can be removed and an ammeter connected
across the two pins if it is required to measure the V
LOGIC
current. The source for V
LOGIC
is determined by LK9.
LK3
This link connects the V
DD
pin of the AD5501/AD5504 to the V
DD
source. This link can be removed and an ammeter connected
across the two pins if it is required to measure the V
DD
current.
LK9
This link selects the voltage source for V
LOGIC
.
If this link is in Position A, V
LOGIC
= 5 V from the USB interface.
If this link is in Position B, V
LOGIC
= 3 V from the voltage regulator, U3.
If this link is in Position C, V
LOGIC
is connected to the banana sockets, J4 and J5. An external voltage source should be applied to these
sockets.
LK10
This link selects the logic level applied to R_SEL.
If this link is in Position A, R_SEL is controlled by software.
If this link is in Position B, R_SEL is connected to DGND.
If this link is in Position C, R_SEL is connected to V
LOGIC
.
