19-6305; Rev 0; 5/12
MAX5725A Evaluation Kit
Evaluates: MAX5723/MAX5724/
MAX5725A/MAX5725B
General Description
The MAX5725A evaluation kit (EV kit) demonstrates
the MAX5725A 12-bit, 8-channel, low-power DAC with
selectable internal references and buffered voltage out-
put. The IC is in a 20-pin TSSOP package. The EV kit
provides control to change the DAC’s outputs, power
operations, references, and watchdog time setting.
The IC features a watchdog function that can be enabled
to monitor the I/O interface for activity and integrity.
The EV kit includes a USB-to-SPI interface circuit. The
EV kit features Windows XP
M
-, Windows Vista
M
-, and
Windows
M
7-compatible software that provides a simple
graphical user interface (GUI) for exercising the IC’s
features.
The EV kit comes with the MAX5725AAUP+ installed,
which is the 12-bit SPI version. Contact the factory for
samples of the pin-compatible MAX5723AUP+ (8-bit),
MAX5724AUP+ (10-bit), and MAX5725BAUP+ (12-bit)
versions.
Ordering Information
appears at end of data sheet.
Features
S
Wide Input Supply Range: 2.7V to 5.5V
S
Independent Voltage for Digital I/O: 1.8V to 5.5V
S
Demonstrates 4.4µs (typ) Settling Time of
Buffered Output
S
Precision Selectable Internal References
Supporting 2.048V, 2.500V, and 4.096V
S
Demonstrates User-Supplied External Reference
S
Three Selectable Output Impedance (Termination)
in Power-Down Mode
1kI, 100kI, or High Impedance
S
Power-Up Reset to Midscale or Zero
S
Supports Entire Family of Octal SPI/I
2
C DACs
S
Windows XP-, Windows Vista-, and
Windows 7-Compatible Software
S
USB-Powered (Cable Included)
S
Demonstrates Configurable Interface Watchdog
Timer
S
Fully Assembled and Tested with Proven PCB
Layout
Figure 1. MAX5725A EV Kit
Windows, Windows XP, and Windows Vista are registered
trademarks of Microsoft Corp.
_________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX5725A Evaluation Kit
Evaluates: MAX5723/MAX5724/
MAX5725A/MAX5725B
Component List
DESIGNATION
C1, C13, C15
C2, C3, C5, C10,
C17, C19, C20,
C24, C26–C29,
C36
C4
C6–C9, C25,
C37–C40
C11, C12
QTY
3
DESCRIPTION
10FF
Q10%,
10V X7R ceramic
capacitors (0805)
Murata GRM21BR71A106K
0.1FF
Q10%,
16V X7R ceramic
capacitors (0603)
Murata GRM188R71C104K
100pF
Q5%,
50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H101J
Not installed, ceramic
capacitors (0603)
10pF
Q5%,
50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H100J
1FF
Q10%,
16V X7R ceramic
capacitors (0603)
Murata GRM188R71C105K
4.7FF
Q10%,
10V X5R ceramic
capacitor (0805)
Murata GRM219R61A475K
0.033FF
Q10%,
25V X7R
ceramic capacitor (0603)
Murata GRM188R71E333K
22pF
Q5%,
50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H220J
Green LED (0603)
Red multipurpose test points
Black multipurpose test point
Not installed, 10-pin (2 x 5)
header
18-pin (2 x 9) header
3-pin headers
4-pin headers
2-pin headers
—
—
3
5
—
*EP
= Exposed pad.
1
14
1
Y2
1
DESIGNATION
R1, R2, R28
R3
R5, R18–R26
R6, R7
R8
R9–R13, R16
R14, R15
R29
U1
QTY
3
1
10
2
1
0
0
1
1
DESCRIPTION
4.7kI
Q5%
resistors (0603)
1MI
Q5%
resistor (0603)
1.5kI
Q5%
resistors (0603)
27I
Q5%
resistors (0603)
220I
Q5%
resistor (0603)
Not installed, resistors (0402)
R9–R13 are short (PC trace);
R16 is open
Not installed, resistors (0603)
100kI
Q5%
resistor (0603)
12-bit, 8-channel DAC
(20 TSSOP)
Maxim MAX5725AAUP+
Microcontroller (68 QFN-EP*)
Maxim MAXQ2000-RAX+
EEPROM (8 SO)
UART-to-USB converter
(32 LQFP)
3.3V LDO regulator (5 SC70)
Maxim MAX8511EXK33+
2.5V LDO regulator (5 SC70)
Maxim MAX8511EXK25+
2.5V voltage reference (8 SO)
Maxim MAX6173AASA+
Level translators (10
FMAX
M
)
Maxim MAX1840EUB+
USB type-B, right-angle PC-
mount receptacle
16MHz crystal (HCM49)
Hong Kong X’tals
SSM16000N1HK188F0-0
6MHz crystal (HCM49)
Hong Kong X’tals
SSL60000N1HK188F0-0
USB high-speed A-to-B cable
(6 ft)
Shunts
PCB: MAX5725A EVALUATION
KIT
13
1
0
2
U2
U3
U4
U5
U6
U7
U8, U9, U10
USB1
1
0
1
1
1
1
3
1
C14, C16,
C30–C35
8
C18
1
C21
1
C22, C23
D1
DAC0–DAC7,
IRQ,
REF, +5V
GND
H1
H2
JU1, JU2, JU9,
JU10, JU11,
JU13
JU3, JU4, JU5
JU6, JU7, JU8,
JU12, JU14
2
1
11
1
0
1
6
Y1
1
µ
MAX is a registered trademark of Maxim Integrated Products,
Inc.
_________________________________________________________________
Maxim Integrated Products
2
MAX5725A Evaluation Kit
Evaluates: MAX5723/MAX5724/
MAX5725A/MAX5725B
Component Suppliers
SUPPLIER
Hong Kong X’tals Ltd.
Murata Electronics North America, Inc.
PHONE
852-35112388
770-436-1300
WEBSITE
www.hongkongcrystal.com
www.murata-northamerica.com
Note:
Indicate that you are using the MAX5725A when contacting these component suppliers.
MAX5725A EV Kit Files
FILES
INSTALL.EXE
MAX5725A.EXE
CDM20600.EXE
UNINSTALL.EXE
USB_Driver_Help_200.PDF
DESCRIPTION
Installs the EV kit files on your
computer
Application program
Installs the USB device driver
Uninstalls the EV kit software
USB driver installation help file
3) Install the EV kit software on your computer by run-
ning the INSTALL.EXE program inside the temporary
folder. The program files are copied to your PC and
icons are created in the Windows
Start | Programs
menu. During software installation, some versions of
Windows may show a warning message indicating
that this software is from an unknown publisher. This
is not an error condition and it is safe to proceed with
installation. Administrator privileges are required to
install the USB device driver on Windows.
4) Connect the USB cable from the PC to the EV kit
board. A Windows message appears when connect-
ing the EV kit board to the PC for the first time. Each
version of Windows has a slightly different message.
If you see a Windows message stating
ready to use,
then proceed to the next step. Otherwise, open the
USB_Driver_Help_200.PDF document in the Windows
Start | Programs
menu to verify that the USB driver
was installed successfully.
5) Start the EV kit software by opening its icon in the
Start | Programs
menu. The EV kit software main
window appears, as shown in Figure 2.
6) Within the
DACs
tab sheet, press the
EXECUTE
but-
ton with the
Quick DAC Output Voltage
group box.
7) Use the GNDS pad for the negative terminal of the
DVM and use the positive terminal to measure the
voltage at the DAC_ test points. Verify that the volt-
ages measured are 1.25V.
Quick Start
• MAX5725A EV kit (USB cable included)
Required Equipment
• Windows XP, Windows Vista, or Windows 7 PC with a
spare USB port
• Digital voltmeter (DVM)
Note:
In the following sections, software-related items
are identified by bolding. Text in
bold
refers to items
directly from the EV kit software. Text in
bold and under-
lined
refers to items from the Windows operating system.
The EV kit is fully assembled and tested. Follow the steps
below to verify board operation:
Procedure
1) Verify that jumpers JU1–JU14 are in their default posi-
tions, as shown in Table 1.
2) Visit
www.maxim-ic.com/evkitsoftware
to download
the latest version of the EV kit software, 5725ARxx.
ZIP. Save the EV kit software to a temporary folder and
uncompress the ZIP file.
_________________________________________________________________
Maxim Integrated Products
3
MAX5725A Evaluation Kit
Evaluates: MAX5723/MAX5724/
MAX5725A/MAX5725B
Figure 2. MAX5725A EV Kit Software Main Window (DACs Tab)
_________________________________________________________________
Maxim Integrated Products
4
MAX5725A Evaluation Kit
Evaluates: MAX5723/MAX5724/
MAX5725A/MAX5725B
Figure 3. MAX5725A EV Kit Software Main Window (Scripts Tab)
_________________________________________________________________
Maxim Integrated Products
5
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