19-4543; Rev 0; 4/09
MAX5774 Evaluation Kit
General Description
The MAX5774 evaluation kit (EV kit) demonstrates the
operation of the MAX5774 32-channel, 14-bit, voltage-
output digital-to-analog converter (DAC). The DAC inte-
grates an SPI™/DSP-compatible serial interface to
control each channel output. Each DAC channel has its
own programmable input, gain, and offset register, and
its output voltage can be set in the -2.5V to +7.5V range.
The MAX5774 EV kit circuit includes USB-to-SPI com-
munication circuitry that generates the proper SPI sig-
nals to program the DAC outputs.
The MAX5774 EV kit includes Windows
®
2000/XP
®
and Windows Vista
®
(32-bit)-compatible software that
provides a simple graphical user interface (GUI) for
exercising the MAX5774 features.
The MAX5774 EV kit can also evaluate the MAX5773
and MAX5775. The MAX5773 has a 0 to +10V range,
and the MAX5775 has a -5V to +5V range. To evaluate
the MAX5773 or MAX5775, replace U1 with a
MAX5773UCB+ or MAX5775UCB+.
o
32 Individual DACs
o
-2.5V to +7.5V Output Range
o
Demonstrates Glitch-Free Power-Up
o
SPI Interface
o
Easy-to-Use Menu-Driven Software
o
On-Board SPI Communication Interface Circuitry
and USB Interface
o
Windows 2000/XP- and Windows Vista (32-Bit)-
Compatible Evaluation Software
o
Lead(Pb)-Free and RoHS Compliant
o
Fully Assembled and Tested
Features
Evaluates: MAX5773/MAX5774/MAX5775
Ordering Information
PART
MAX5774EVKIT+
TYPE
EV Kit
+Denotes
lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION
C1, C3–C10,
C17, C21, C23,
C25, C26, C48
C2, C13, C15,
C27, C28, C29
QTY
DESCRIPTION
0.1µF ±10%, 16V X7R ceramic
capacitors (0603)
TDK C1608X7R1C104K
Murata GRM188R71C104K
10µF ±10%, 6.3V X5R ceramic
capacitors (0603)
Murata GRM188R60J106K
10pF ±5%, 50V C0G ceramic
capacitors (0603)
TDK C1608C0G1H100J or
Murata GRM1885C1H100J
1µF ±10%, 16V X7R ceramic
capacitors (0603)
Murata GRM188R71C105K
22pF ±5%, 50V C0G ceramic
capacitors (0603)
TDK C1608C0G1H220J
3300pF ±10%, 50V X7R ceramic
capacitor (0603)
TDK C1608X7R1H332K
DESIGNATION
C22
C24, C35, C38,
C41, C42
C30
QTY
1
DESCRIPTION
0.01µF ±10%, 16V X7R ceramic
capacitor (0603)
Murata GRM188R71C103K
Not installed, ceramic capacitors
(0603)
10µF ±10%, 16V X5R ceramic
capacitor (0805)
Murata GRM21BR61C106K
100pF ±5%, 50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H101J
47pF ±5%, 50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H470J
Green LED (0603)
Panasonic LNJ314G8TRA
Dual-row (2 x 10) 20-pin header
Dual-row (2 x 11) 22-pin headers
8-pin header
Dual-row (2 x 5) 10-pin header
15
0
6
1
C11, C12
2
C32
1
C14, C16, C31,
C33, C36, C37,
C39, C40,
C43–C47
C18, C19
13
C34
1
D1
J1
J2, J3
J4
J5
1
1
2
1
1
2
C20
1
SPI is a trademark of Motorola, Inc.
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.
MAX5774 Evaluation Kit
Evaluates: MAX5773/MAX5774/MAX5775
Component List (continued)
DESIGNATION
J6
JU1
JU2, JU3, JU4
JU5
L1, L2, L3
R1, R8, R9,
R12–R15
R2
R3
R4
R5
R6, R7
R10
R11
U1
U2
U3
U4
QTY
1
1
3
0
3
0
1
1
1
1
2
1
1
1
1
1
1
DESCRIPTION
4-pin header
3-pin header
2-pin headers
Not installed, 2-pin header
Ferrite chip bead, (0805)
Murata BLM21AG102SN1
Not installed, resistors (0603)
220Ω ±5% resistor (0603)
10kΩ ±5% resistor (0603)
2.2kΩ ±5% resistor (0603)
1.5kΩ ±5% resistor (0603)
27Ω ±5% resistors (0603)
20kΩ ±5% resistor (0603)
200kΩ ±5% resistor (0603)
32-channel, 14-bit DAC (64 TQFP)
Maxim MAX5774UCB+
Microcontroller (68 QFN-EP*)
Maxim MAXQ2000-RAX+
93C46 type 3-wire EEPROM (8 SO)
UART-to-USB converter (32 TQFP)
Y1
Y2
—
—
1
1
4
1
USB
1
U9
1
U8
1
U7
1
U6
1
U5
1
DESIGNATION
QTY
DESCRIPTION
3.3V regulator (5 SC70)
Maxim MAX8511EXK33+
(Top Mark: AEI)
2.5V regulator (5 SC70)
Maxim MAX8511EXK25+
(Top Mark: ADV)
Dual-level translator (8 SOT23)
Maxim MAX3373EEKA+
(Top Mark: AAKS)
Quad-level translator (14 TSSOP)
Maxim MAX3378EEUD+
3V regulator (5 SC70)
Maxim MAX8510EXK30+
(Top Mark: ADT)
USB series type-B right-angle PC-
mount receptacle
16MHz crystal
6MHz crystal
Shunts (JU1–JU4)
PCB: MAX5774 EVALUATION KIT+
*EP
= Exposed pad.
Component Suppliers
SUPPLIER
Murata Electronics North America, Inc.
Panasonic
TDK
PHONE
770-436-1300
800-344-2112
847-803-6100
WEBSITE
www.murata-northamerica.com
www.panasonic.com
www.component.tdk.com
Note:
Indicate that you are using the MAX5774 when contacting these component suppliers.
MAX5774 EV Kit Software Files
FILE
INSTALL.EXE
MAX5774.EXE
FTD2XX.INF
UNINST.INI
USB_Driver_Help.PDF
DESCRIPTION
Installs the EV kit files on your
computer
Application program
USB device driver file
Uninstalls the EV kit software
USB driver installation help file
2
_______________________________________________________________________________________
MAX5774 Evaluation Kit
Quick Start
Required Equipment
•
•
•
•
•
•
•
MAX5774 EV kit (USB cable included)
One +5V DC power supply for AVDD
One -2.75V DC power supply for VSS
7) Connect the -2.75V power supply between VSS and
AGND pads.
8) Connect the +8V power supply between AVCC and
AGND pads.
9) Connect the +2.7V power supply between DVDD
and DGND pads.
10) Connect the USB cable from the PC to the EV kit
board. A
New Hardware Found
window pops up
when installing the USB driver for the first time. If a
window is not seen that is similar to the one
described above after 30s, remove the USB cable
from the board and reconnect it. Administrator privi-
leges are required to install the USB device driver
on Windows.
11) Follow the directions of the
Add New Hardware
Wizard
to install the USB device driver. Choose the
Search for the best driver for your device
option.
Specify the location of the device driver to be
C:\Program Files\MAX5774
(default installation
directory) using the
Browse
button. During device
driver installation, Windows may show a warning
message indicating that the device driver Maxim
uses does not contain a digital signature. This is not
an error condition and it is safe to proceed with instal-
lation. Refer to the USB_Driver_Help.PDF document
included with the software for additional information.
12) Turn on the power supplies.
13) Start the MAX5774 EV kit software by opening its
icon in the
Start | Programs
menu. The EV kit soft-
ware main window appears, as shown in Figure 1.
14) Press the
Default
button in the main window.
15) Verify that the REF pad voltage measures +3V.
16) Verify that channel OUT0, located at pin J1-20,
measures approximately -2.5V. Pin J1-19 can be
used as a ground reference.
17) Use the software to program the DAC’s output
channels to various voltages.
Evaluates: MAX5773/MAX5774/MAX5775
One +8V DC power supply for AVCC
One +2.7V DC power supply for DVDD
One voltmeter
User-supplied Windows 2000/XP or Windows Vista PC
with a spare USB port
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
underlined
refers to items from the Windows operat-
ing system.
Procedure
The MAX5774 EV kit is a fully assembled and tested
surface-mount board. Follow the steps below to verify
board operation.
Caution: Do not turn on the power
supplies until all connections are completed.
1) Visit
www.maxim-ic.com/evkitsoftware
to down-
load the latest version of the EV kit software,
5774Rxx.ZIP. Save the EV kit software to a tempo-
rary folder and uncompress the ZIP file.
2) Install the EV kit software on your computer by run-
ning the INSTALL.EXE program inside the temporary
folder. The program files are copied and icons
are created in the Windows
Start | Programs
menu.
3) Install a shunt across pins 1-2 of jumper JU1 (SPI
interface mode).
4) Install shunts across jumpers JU2 and JU3 (GS1
and GS2 connected to ground).
5) Install a shunt across jumper JU4 (REF = 3V).
6) Connect the +5V power supply between AVDD and
AGND pads.
_______________________________________________________________________________________
3
MAX5774 Evaluation Kit
Evaluates: MAX5773/MAX5774/MAX5775
Figure 1. MAX5774 EV Kit Software Main Window (User-Interface Panel)
Detailed Description of Software
The MAX5774 EV kit GUI software provides a user inter-
face (Figure 1) to control each of the 32 channels on
the MAX5774 DAC. To start the MAX5774 EV kit soft-
ware, double-click the MAX5774 EV kit icon created
during installation. The user will have to wait approxi-
mately 15s while the software detects and configures
the MAX5774 EV kit.
User-Interface Panel
The user interface (Figure 1) is easy to operate; use the
mouse, or press the Tab and arrow keys to navigate
the window. After updating a value in a spin or edit
box, press the keyboard’s Enter key or exit the box to
submit the value to the EV kit software. The status bar
located at the bottom of the GUI window displays the
status of the EV kit board during power-up, data sent
and data received in hexadecimal format, and general
software status.
4
_______________________________________________________________________________________
MAX5774 Evaluation Kit
The user can exit the software using the
File | Exit
menu item. Select the
Options | Demo Mode
menu
item to exit or enter demo mode. When in demo mode,
all software communication to the EV kit hardware is
disabled and most of the software’s GUI is functional.
This feature enables a user to evaluate the software
without hardware connectivity. The
Help
menu item
provides help and additional information about the EV
kit software.
Read Registers
In the
Channel Configuration
group box, press the
Read DAC, Read Gain, Read Offset,
or
Read Input
button to read the active channel’s output DAC, gain,
offset, or input register, respectively. The number dis-
played to the right of the button is the hexadecimal
equivalent of data read.
Note:
Only a single channel
(0–31) or the offset channel registers can be read.
Channel pair and all channel selections are write only.
Evaluates: MAX5773/MAX5774/MAX5775
DAC Registers
Select the desired channel(s) from the
Active Channel
combo box in the
Channel Configuration
group box or
by clicking a channel name in the software’s IC register
table beneath. A single channel (0–31), pair of chan-
nels, all channels, and the offset channel are selec-
table.
The
MAC-bypass Input Code, Gain Register Code,
Offset Register Code,
and
Input Register Code
spin
boxes accept 14-bit hexadecimal data (range:
0x0000–0x3FFF) and 14-bit decimal data (range:
0–16383). After updating spin-box data, press the key-
board’s Enter key or exit the spin box to write data to
the output DAC, input, gain, or offset register(s),
respectively. The spin-box up/down arrow keys update
the spin-box data and write data to the IC simultane-
ously. The number displayed to the right of the spin box
is the hexadecimal equivalent of data written to the IC.
Press the
Load DAC
button to load the output DAC
register(s) with the input register code(s) calibrated
with the gain and offset register codes for the selected
channel(s). The
MAC-bypass Input Code
spin box
loads data directly into the output DAC register(s), does
not modify the input register(s), and bypasses gain and
offset calibration for the selected channel(s).
The voltage for the 32 DACs is given by the following
equation:
V
OUT
=
GAIN
×
V
REF
×
(
DAC Code
−
Offset DAC Code
)
2
14
+
V
GS
DAC RESET
Reset the MAX5774 to its power-up state, where all reg-
ister codes are 0x0000, by using one of the following:
1) Hardware reset (RESET pin):
a) Press the
RESET
Toggle
button in the
DAC Pins
group box.
2) Software reset:
a) Select “1” from the
SING
combo box in the
Configuration Register
group box.
b) Press the
Write
button in the
Configuration
Register
group box.
c) Press the
DAC RESET
button in the main window.
Lastly, press the
Default
button in the main window to
set the MAX5774 to its default configuration.
Configuration Register
The configuration register controls the operating mode of
the MAX5774, and communicates the status during a read
command. Use the
SING, GLT, DT,
and
SHDN
combo
boxes to select the configuration. Press the
Write
button
to actually write to the configuration register. Press the
Read
button to read the configuration register. Refer to
the
Configuration Register
section in the MAX5773/
MAX5774/MAX5775 IC data sheet for more details.
LDAC
and
RESET
Pins
The MAX5774 features a load DAC (LDAC) pin. Toggle
this pin by pressing the
/LDAC Toggle
button in the
DAC Pins
group box to cause all DAC outputs to
update simultaneously.
The MAX5774 also features a clear (RESET) pin. Drive
this pin by pressing the
/RESET Toggle
button in the
DAC Pins
group box to set all the channels to 0V, the
offset to 0V, and the input and DAC registers to 0 code.
where GAIN = 10/3 for the MAX5774, V
REF
= the refer-
ence voltage (3V by default), V
GS
= is the ground-
sense voltage (0V by default), and DAC code = output
DAC register code.
V
REF
can be modified using the
Reference Voltage
edit box, which accepts a 2.9V to 3.1V unconnected
point value. After updating the edit-box value, press the
keyboard’s Enter key or exit the edit box to update the
software’s reference-voltage value.
Simple SPI Commands
There are two methods for communicating with the
MAX5774, through the normal user-interface panel or
through the SPI commands available by selecting the
Options | Interface (Advanced Users)
menu item. A
window is displayed that executes an SPI read/write
operation (Figure 2).
5
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