EVAL-AD5370/2/3EBZ Datasheet by Analog Devices Inc.

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Evaluation Board for
Preliminary Technical Data
Rev. PrC
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Full-Featured Evaluation Board for the
USB Interface
PC Software for Register Programming
Various Reference Voltages Available
Stand-Alone Operation
This Technical Note describes the operation and functionality
of the Evaluation Board for the AD5370, AD5372 and AD5373.
As these 3 parts are pin compatible the same evaluation board is
used for all. AD537x will be used throughout this technical note
to refer to the actual multi-channel DAC used on the board.
This note should be used in conjunction with the data sheet of
the appropriate DAC. The evaluation board allows the
this link is in position C the voltage on SMB connector
ed easily. The evaluation board can be used as a stand alone
board with control coming from an external DSP or micro-
controller or it can be connected to a PC. Software is provided
which can be used to program the registers of the AD537x.
Control of the AD537x is achieved via a USB interface
(USB Used)
Figure 1. Functional Block Diagram
Preliminary Technical Data
Rev. PrC | Page 2 of 12
General Description ......................................................................... 3
Functionality Overview ............................................................... 3
Power Supplies .............................................................................. 3
Reference Selection ...................................................................... 3
Using The USB Interface..............................................................3
Stand-Alone Operation ................................................................3
Using the USB Software................................................................4
Schematics ..........................................................................................9
Preliminary Technical Data
Rev. PrC | Page 3 of 12
The evaluation board for the AD537x is designed to allow the
user to fully evaluate all the functions and performance of the
AD537x prior to designing it into a system. The evaluation
board can be used in a stand-alone mode with the control
signals being provided through the 20 pin header J3 or it can be
connected to a PC using the USB cable supplied with the
evaluation board kit. Software is provided which allows the user
to program the various registers of the AD537x with ease. The
software operation is described later in this document.
The evaluation board requires a +5V supply for DVCC. The VDD
and VSS supplies can be any value within the power supply
limits as specified in the AD537x data sheet. Power supply
connections are made to the screw terminals of J2. The USB
interface, if used, gets its power supply from the USB port of the
PC. This power supply is not used by the AD537x or any of its
associated circuitry. When connecting the power supply leads it
is recommended that the supplies are turned off and that the
ground leads are connected first.
The evaluation board includes two voltage references ICs, the
ADR435 and ADR423 which are 5V and 3V references
respectively. An SMB connector is provided to allow an external
voltage to be connected for use as a reference. Link LK4 is used
to select which reference source is used by the AD537x as
shown in Table 1.
Table 1. Reference Selection using LK4
A The reference voltage is 3V (default)
B The reference voltage is 5V
C The voltage on the SMB, EXT_REF is used as the
reference voltage
By default the voltage reference pins of the AD537x, VREF0 and
VREF1, both use the same reference, i.e. that selected by LK4. If
it is required that the reference pins should use different voltage
references this can be achieved by removing the 0Ω resistor
associated with each VREF pin. The required reference can then
be connected to the testpoint associated with the VREF pin.
Table shows the 0Ω resistor and testpoint associated with each
VREF pin.
Table 2. 0Ω Resistor and Testpoints for VREF pins
VREF Resistor Testpoint
VREF0 R17 T63
VREF1 R18 T64
The software provided with the evaluation board kit allows the
user to program the registers of the AD537x via the USB
interface. It is important that the software supplied is installed
on the PC before the board is connected. See the Using the USB
Software section for more information. The USB circuitry gets
its power from the USB port of the PC and will generate the
required interface signals, RESET, CLR, SYNC, SCLK etc. to
control the AD537x. To use the interface LK1, LK3 and LK8
should be in place. The function of these links is described in
Table 4.
The evaluation board can be used as a stand-alone device if
required. This has the advantage that it lets the user to connect
the interface pins of the AD537x to their own DSP or micro-
controller thus allowing them to write code to operate the
AD537x as their application requires. To use the board in stand-
alone mode the connection to the USB interface must be
removed. This is achieved by removing LK1, which will three-
state the connections to CLR, LDAC, SYNC, SCLK and DIN. LK3
should be removed to isolate the RESET pin from the USB
interface and the push-button. The interface signals required to
control the AD537x can then be provided through the 20 pin
header J3. The pinout of J3 is shown in Table 3
Table 3. J3 Header Pinout
Pin Signal Pin Signal
1 DIN 8
2 NC 10
3 SCLK 12
4 NC 14
5 NC 16 NC
6 SYNC 18 NC
Preliminary Technical Data
Rev. PrC | Page 4 of 12
Table 4. Summary of Link Positions
Link Description
LK1 Determines if the USB interface is to be used
If this link is inserted the USB interface will generate the signals required to control the AD537x
If this link is removed the USB interface is not used and header J3 must be used to provde signals to the AD537x
LK3 Selects Source of the RESET signal
If this link is inserted the RESETsignal comes from either the RESET push-button being pressed or a RESET signal being issued
by the USB interface
If this link is removed the RESET signal must come for the header J3
LK4 Selects the Reference Source
If this link is in position A the 3V reference is selected
If this link is in position B the 5V reference is selected
If this link is in position C the voltage on SMB connector EXT_REF is selected
LK8 Selects the Source of the CLR signal
If this link is inserted the CLR signal comes from the USB interface
If this link is removed the CLR signal must come for the header J3
The evaluation board kit comes supplied with a CD containing
PC software allowing the user to control the evaluation board
via the USB interface. The software must be installed before the
evaluation board is connected to the USB port. The software
installation program usually runs automatically when the CD is
inserted in the drive but if this doesnt happen the user should
double-click on the SETUP.EXE file in the root directory of the
CD. The software will be installed and shortcuts will be placed
on the Start Menu in a folder called Analog Devices. When the
software has been installed the evaluation board can be
connected to the USB port.
When the software is started the user is presented with a
selection box. The selection box presents a choice of all the high
channel count DACs in the AD536x and AD537x family. The
user should click the button appropriate to the board being
The first tab in the main operating window, shown in Figure 6,
allows the user to send data to the registers of any of the DACs.
All the available channels are shown in the DAC selection
section. When one of the radio buttons is selected the lower
portion of the screen will show the values currently assigned to
that DAC channel. The X1A, X1B, M or C registers can be
updated simply by entering the desired code and clicking the X,
M or C button. Note that when the X button is pressed the X1A
or X1B register is updated according to the selection of the A/B
radio button.
To update the DAC output the user should click the LDAC
The Input Code block allows the user to store several
commonly used values and select between them as required.
The second tab of the tabbed dialog box also allows the user to
change the contents of the Offset DACs. The values loaded to
the Offset DACs will not affect the output voltages until LDAC
is pulsed.
The third tab of the tabbed dialog box allows the user to assert
or negate the RESET, CLR and LDAC. The user can also write
24 bits directly to the part. This can be useful, for example, to
write to a group of channels using a single write operation. This
function operates independently from the rest of the software
so any changes made by a direct write will not be evident in the
rest of the software. For example, if the direct write changes the
X1 register of all channels to 0xFFFF the first tab in the main
operating window will not be updated and will continue to
show the previous values that were entered.
The fourth tab shows the expected output voltages based on the
values of the X, M and C registers from the main operating
window, the reference value and the Offset DAC value. These
values are recalculated every time the tab is viewed.
] A05371 Evaluation Suftwnr T uvrsa DAB: T Slunals I umwwmmes DA: Se‘eclnn RESET F DAED F DAEI F nAcz F DAC3 F DAEA F DAES F macs F DAE? F DAEB F DADS r DAEIEI r DAEH F DAEIZ r DAEI3 r DAEM r DAEIS r DAEIE F DAEW F DAEIE F DAEIH r DAEZCI f“ DAEZW F DAEZZ F DAEZ] '"W‘EUGEIHEXI F DAm F DAEZS F DAE26 F DAEZ7 F DAEZfl F DAEZS F DAE3U F DAE3I ‘23 G F DAI232 F DAI233 F DAI234 F was F max F DAI237 F DAI23S F was IJElEIEI F 3m r Gluup o , VuuKD mu r vnsm VREFI VREFZ 3 a a anon r (g (g 0000 r‘ PuseLnAc DDEID r [—0000 ”3000 r x» V >— — ~ _'—— nunn F "DUB nuuu — r 0000 W x23 ”W” F M Dunn r ouuuuu
Preliminary Technical Data
Rev. PrC | Page 5 of 12
Figure 2. AD537x Tab 1 Software Screenshot
3A05371Evaluan n H: thou! ftware 4D :(1 BR Channel Mam DAC: T on“: 031:? T Sam‘s & Dwec| Load T Uumurwxms Hex Value ‘555 — >> unwDAcn Hex Value |—‘ 555 _ >> muse: DAC 1 Hex Value [7155 — >> unw DAC 2 flulpul Dala Wont DUDUDU
Preliminary Technical Data
Rev. PrC | Page 6 of 12
Figure 3. AD537x Tab 2 Software Screenshot
]AD5371Evalual n ftware 40x1 thChannel fieAbaul Mam DACs T Elke! DAC: T T auxpur Vo‘lages Due-2| 2478‘! Lead W W 1W 1W 1W 2) W337 RESET ngh l RESET Low | Load Command [LR Mgw ‘ LDAEH-gh l CLR Low ‘ LDAELuw | Pulse RESET l Pulse LDAE | [lulpul Dala Wont DUDUDU
Preliminary Technical Data
Rev. PrC | Page 7 of 12
Figure 4. AD537x Tab 3 Software Screenshot
]AD5371Evaluah n ftware 4L) :(1 BR Channel Hem: VaulU=D mum VuuKB=U UUUUV VwflE=U UUUW Vw|24=0 EIDEIEN Vm132=fl DDDEN Vom =[I unuw Vou12=fl umw Vou8=U IIIIIN Vuul1D=|JUUUW Vuut17=U UWW Vaul1B=U UUUW Vuur25=0 umw VaulZIkD DEIDW Vnu133=fl UIIIEN Voul34=fl DDDW Mam DAC: T Ullset DAE: le3=u [IDEIUV Vuu“ H3 CUIIN Vuufl S£VW|IN Vnul27=flm|IN Voul3§$ 03W T Swgna‘s & Dwec| Load T Vouu=El [IUDUV Vw|12=U DJIIN Vuu|20=|lwflN Voul28=flm|IN Vnulifi=fl 03W Vnu5=u [umv Voms=n unuw Vw|13=U UUUW VUUIN=U UUUW Vwk21=0 UUUW Vuut22=0 UUUW Vw|29=0 EIDEIEN Vuut30=0 DDDW Vm137=fl DDDEN Vnut38=fl flflflflv’ [pun anlage: VourHI unuw VuuK15=U UUUW Vuu£23=0 UUUW Vuu|31 =0 UDEIW Vnm39=fl UDDEN flulpul Dala Wnlt DUDUDU
Preliminary Technical Data
Rev. PrC | Page 8 of 12
Figure 5. AD537x Tab 4 Software Screenshot
Preliminary Technical Data
Rev. PrC | Page 9 of 12
Figure 6. AD537x Schematic (1 of 2)
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Preliminary Technical Data
Rev. PrC | Page 10 of 12
Figure 7. AD537x Schematic (2 of 2
Figure 8. AD537x Component Side Silkscreen)
Preliminary Technical Data
Rev. PrC | Page 11 of 12
Table 5. Bill Of Materials
Name Part Type Value PCB Decal Part Description Stock Code1
U1 AD5370/2/3 LQFP64 Multichannel 16/14-Bit denseDAC
U2 ADP3303-3.3 SO8NB Precision Low Dropout Voltage
U8 ADR423 SO8NB 3V Reference ADR423AR
U5 ADR435 SO8NB 5V Reference ADR435AR
U3 24LC64 SO8NB 64K I2C Serial EEPROM Digikey 24LC64-I/SN-
U4 74HC245 TSSOP20 Bus Transciever Digikey 296-8279-1-ND
U7 CY7C68013-CSP LFCSP-56 USB Microcontroller CY7C68013-56LFC
J1 USB-MINI-B USB-MINI-B USB Mini-B Connector (usb-otg) FEC 476-8309
(Digikey WM2499CT-
J2 CON\POWER5 CON\POWER5 5 Pin Termical Block FEC 151-785 & 151-786
J4 HEADER50 HEADER50 50 Pin (2x25) 0.1" Pitch Header FEC 148-535
Push Button Switch (sealed 6mm x
FEC 177-807
C3 CAP+ 10uF CAP\TAJ_A 10V SMD Tantalum Capacitor FEC 197-130
C21, C23,
C29, C31,
C33, C42
CAP+ 10uF CAP\TAJ_C 25V SMD Tantalum Capacitor FEC 197-518
C17 CAP 1uF 0603 10V DC Y5V Ceramic Capacitor FEC 318-8840
D1 LED LED-0805 Green Light Emitting Diode FEC 359-9681
EXT_REF SMB SMB 50r Straight SMB Jack FEC 365 1228
C4 CAP+ 2.2uF CAP\TAJ_A 10V SMD Tantalum Capacitor FEC 498-646
LK1, LK3, LK8 JUMPER SIP-2P 2 Pin (0.1" Pitch) Header & Shorting
FEC 511-705 & 150-411
LK4 JUMPER-3 JUMPER_3 6 Pin (3x2) 0.1" Header & Shorting Block FEC 511-780 & 150-411
J3 HEADER20 HEADER20 20 Pin (2x10) 0.1" Pitch Header FEC 511-833
XTAL_CM309S Plastic SMD Crystal FEC 569-872
U6 NC7S08 SOT23-5 Tinylogic AND Gate FEC 685-926
C1, C2 CAP 22pF 0603 50V NPO SMD Ceramic Capacitor FEC 722-005
R1, R17, R18 RES 0R 0603 SMD Resistor FEC 772-227
T1, T3, T11,
T12, T13, T14,
T15, T16, T17,
TESTPOINT TESTPOINT Black Testpoint FEC 873-1128
T2, T4, T5, T6,
T7, T8, T9,
T10, T60, T63,
TESTPOINT TESTPOINT Red Testpoint FEC 873-1144
V0-V39 TESTPOINT TESTPOINT Red Testpoint FEC 873-1144
Preliminary Technical Data
Rev. PrC | Page 12 of 12 EB07010-0-5/08(PrC)
Name Part Type Value PCB Decal Part Description Stock Code1
C5, C6, C7,
C8, C9, C10,
C12, C13,
C14, C15,
C16, C18,
C19, C20,
C22, C24,
C26, C28,
C30, C32,
C34, C36,
C40, C41,
C43, C44
CAP 0.1uF 0603 50V X7R Multilayer Ceramic Capacitor FEC 882-0023
R7 RES 1k 0603 SMD Resistor FEC 911-239
R2, R4, R5 RES 10k 0603 SMD Resistor FEC 911-355
R3, R6, R8, R9,
R13, R15
RES 100k 0603 SMD Resistor FEC 911-471
1FEC refers to Farnell In One (www.farnell.com). Digi-Key refers to Digi-Key Corporation (www.digikey.com)

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