19-4313; Rev 0; 10/08
MAX9694 Evaluation Kit
General Description
The MAX9694 evaluation kit (EV kit) demonstrates the
MAX9694 reference voltage generator for gamma cor-
rection in TFT-LCD panels, such as those found in high-
resolution TVs, high-end monitors, or for general
industrial reference voltage generation. The MAX9694
EV kit provides 14 programmable reference voltage
outputs (DAC outputs), four static buffered reference
voltage outputs (reference outputs), and a 7-bit digital
variable reference (DVR) for V
COM
voltage calibration.
The EV kit can use a 9V to 20V DC power supply for
powering the application circuit.
The EV kit features a USB-to-I
2
C interface circuit.
Windows
®
2000/XP- and Windows Vista
®
-compatible
software, with a graphical user interface (GUI), is avail-
able for exercising the MAX9694 features. The EV kit
can also connect to a user-supplied I
2
C interface cir-
cuit for stand-alone MAX9694 operation.
Features
o
14 8-Bit Programmable Reference Voltages (DAC
Outputs)
o
Four Static Buffered Reference Voltages
(Reference Outputs)
o
Programmable V
COM
Voltage Calibration
o
400mA Peak Current on Reference Outputs and
DAC Outputs 1, 7, 8, and 14
o
200mA Peak Current on DAC Outputs 2–6 and 9–13
o
Peak Output Currents
400mA: 4 DAC Outputs and 4 DAC Reference
Outputs
200mA: 10 DAC Outputs
o
9V to 20V DC Power-Supply Operation
o
USB-Powered USB-to-I
2
C Interface Circuit
o
Windows 2000/XP/Vista (32-Bit)-Compatible Software
o
Lead-Free and RoHS Compliant
o
Proven PCB Layout
o
Fully Assembled and Tested
Evaluates: MAX9694
Ordering Information
PART
MAX9694EVKIT+
TYPE
EV Kit
+Denotes
lead-free and RoHS compliant.
Component List
DESIGNATION
C1–C18
C19, C21, C23,
C25, C27–C34,
C40, C41, C42
QTY
0
DESCRIPTION
Not installed, ceramic capacitors
(0603)
0.1μF ±10%, 25V X7R ceramic
capacitors (0603)
Murata GRM188R71E104K or
TDK C1608X7R1E104K
C38, C39
C20, C26, C45,
C47
4
10μF ±10%, 10V X7R ceramic
capacitors (0805)
Murata GRM21BR71A106K
10μF ±10%, 25V X5R ceramic
capacitors (1206)
Murata GRM31CR61E106K
10pF ±5%, 50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H100J or
TDK C1608C0G1H100J
C43, C44, C46
3
2
DESIGNATION
QTY
DESCRIPTION
3300pF ±10%, 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H332K or
TDK C1608X7R1H332K
22pF ±5%, 50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H220J or
TDK C1608C0G1H220J
1μF ±10%, 10V X5R ceramic
capacitors (0603)
Murata GRM188R61A105K or
TDK C1608X5R1A105K
Green LED (0603)
Panasonic LNJ314G8TRA
Not installed, ferrite-bead inductor
(0603)
C37
1
15
C22, C24
2
D1
FB1
1
0
C35, C36
2
Windows 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.
MAX9694 Evaluation Kit
Evaluates: MAX9694
Component List (continued)
DESIGNATION
J1
J2
JU1
JU2
OUT_1–OUT_14,
OUTREFUH,
OUTREFUL,
OUTREFLH,
OUTREFLL
R1–R20,
R29–R46, R58
R21, R25
R22, R24
R23
R26, R27, R50,
R54, R55
R28
R47, R48
R49
R51
R52
R53
R59
QTY
0
0
1
1
DESCRIPTION
Not installed, dual-row (2 x 20)
40-pin header
Not installed, dual-row (2 x 2)
4-pin header
3-pin header
5-pin header
U3
U4
0
Not installed, small PCB test points
U5
Not installed, resistors (0603)
R1–R20, R58 are open;
R29–R46 are short
100Ω ±1% resistors (0603)
4.32kΩ ±1% resistors (0603)
1.21kΩ ±1% resistor (0603)
2.2kΩ ±5% resistors (0603)
3.3kΩ ±1% resistor (0603)
27Ω ±5% resistors (0603)
1.5kΩ ±5% resistor (0603)
10kΩ ±5% resistor (0603)
220Ω ±5% resistor (0603)
Not installed, resistor (0402)
0Ω ±5% resistor (0603)
USB
Y1
Y2
—
—
1
1
1
2
1
U7
1
Dual bidirectional level translators
(8 TDFN-EP*)
Maxim MAX3394EETA+T
(Top Mark: APE)
USB type-B right-angle female
receptacle
16MHz crystal
6MHz crystal
Shunts (JU1, JU2)
PCB: MAX9694 Evaluation Kit+
1
1
1
U2
1
DESIGNATION
U1
QTY
1
DESCRIPTION
Reference voltage generator
(32 TQFN-EP*)
Maxim MAX9694ETJ+
Low-power 16-bit microcontroller
(68 QFN-EP*)
Maxim MAXQ2000-RAX+
93C46 3-wire 16-bit EEPROM (8 SO)
UART-to-USB converter (32 TQFP)
3.3V regulator (5 SC70)
Maxim MAX8511EXK33+T
(Top Mark: AEI)
2.5V regulator (5 SC70)
Maxim MAX8511EXK25+T
(Top Mark: ADV)
0
2
2
1
5
1
2
1
1
1
0
1
U6
1
*EP
= Exposed pad.
Component Suppliers
SUPPLIER
Murata Electronics North America, Inc.
Panasonic Corp.
TDK Corp.
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 MAX9694 when contacting these component suppliers.
2
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MAX9694 Evaluation Kit
MAX9694 EV Kit Files
FILES
INSTALL.EXE
MAX9694.EXE
REF.INI
FTD2XX.INF
UNINST.INI
USB_Driver_Help.PDF
Application program
Software Initialization File
USB device driver file
Uninstalls the EV kit software
USB driver installation help file
DESCRIPTION
Installs the EV kit files on your computer
Evaluates: MAX9694
Quick Start
Required Equipment
Before beginning, the following equipment is needed:
• MAX9694 EV kit (USB cable included)
•
•
•
A user-supplied Windows 2000/XP- or Windows
Vista-compatible PC with a spare USB port
9V to 20V DC power supply @ 500mA
One digital voltmeter (DVM)
Search for the best driver for your device
option.
Specify the location of the device driver to be
C:\Program Files\MAX9694
(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.
5) Once the software and hardware installation is com-
plete, disconnect the USB cable from the EV kit.
6) Verify that shunts are installed as follows:
JU1: Pins 1-2 (on-board 3.3V digital power supply)
JU2: Pins 1-2 (MAX9694 write address = 0xE8)
7) Connect the USB cable to the EV kit.
8) Connect the DVM negative terminal to the AGND
PCB pad next to the VREFL_L PCB pad.
9) Connect a voltage probe to the DVM positive termi-
nal for later use.
10) Set the power supply to 15V and disable the power-
supply output.
11) Connect the power-supply positive terminal to the
AVDD PCB pad (center of board) and the negative
terminal to the nearby AGND PCB pad.
12) Enable the power-supply output.
13) Start the MAX9694 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) Use the DVM voltage probe to measure the refer-
ence input voltages on the VREFU_H, VREFU_L,
VREFL_H, and VREFL_L PCB pads, and type those
values into the corresponding edit boxes of the
Reference Voltages (V)
group box in the software.
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 operating
system.
Procedure
The MAX9694 EV kit is fully assembled and tested.
Follow the steps below to verify board operation:
1) Visit
www.maxim-ic.com/evkitsoftware
to down-
load the latest version of the EV kit software,
9694Rxx.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 tempo-
rary folder. The program files are copied and icons
are created in the Windows
Start | Programs
menu.
3) 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
you do not see a window that is similar to the one
described above after 30 seconds, remove the USB
cable from the board and reconnect it.
Administrator privileges are required to install the
USB device driver on Windows.
4) Follow the directions of the
Add New Hardware
Wizard
to install the USB device driver. Choose the
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3
MAX9694 Evaluation Kit
Evaluates: MAX9694
15) Press the
Quick Start
button.
16) Use the DVM voltage probe to verify that the DAC
output voltages are close to the voltages shown in
the
Output (V)
edit boxes for the respective channel.
MUST be measured at the appropriate PCB pads and
the values entered in the respective
Reference
Voltages (V)
edit boxes for the DAC output calculations
to be correct.
Upon IC startup, the DAC outputs wake up in high-
impedance mode. To exit high-impedance mode, press
the
Quick Start
button or perform the following steps:
1) Modify any of the DAC channel’s register values.
Register values are modified using the edit boxes
and scrollbars of the
Register Settings
tab. See
the
Output Register Values
section for more infor-
mation.
2) Press the
Load All Values To Registers
button.
The
Quick Start
button loads all registers with the val-
ues shown in Figure 1.
Detailed Description of Software
The MAX9694 evaluation software main window is
shown in Figure 1. The GUI software automatically
detects the MAX9694 device address and displays it in
the
I2C Address Setting
drop-down list and in the soft-
ware status bar. The DAC output voltages in the
Upper
DAC Channels
and
Lower DAC Channels
group
boxes are calculated using the upper and lower refer-
ence input voltages on PCB pads VREFU_H, VREFU_L,
VREFL_H, and VREFL_L. The reference input voltages
Figure 1. MAX9694 Evaluation Software Main Window
4
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MAX9694 Evaluation Kit
I
2
C Address Setting
2
C slave address is displayed in the
The MAX9694’s I
I2C Address Setting
drop-down list and in the bottom
status bar of the software window. If an address is
manually selected in the drop-down list, the software
verifies the address and changes the address dis-
played appropriately. If no acknowledge is received
from the EV kit, a pop-up window opens, directing the
user to properly set jumper JU2 on the EV kit. If the
Auto Detect Address
checkbox is checked, the soft-
ware automatically detects the I
2
C address of the
MAX9694.
Output (V)
edit box. The software uses a register
value that generates a voltage closest to the
desired voltage value.
When a register value is changed, the corresponding
field changes its color to red. A user should synchro-
nize the GUI fields and actual device registers by
pressing the
Load All Values To Registers
button.
The
Load All Reg Values From File
button is used to
load all the register values and reference voltages from
a user-selected text file. The
Save All Reg Values To
File
button is used to save all the register values and
reference voltages on the current GUI to a user-named
text file.
Evaluates: MAX9694
Upper and Lower DAC Output Voltages
The upper and lower DAC output voltages are generat-
ed using an on-board resistor-divider network. The user
can also apply external references to the VREFU_H,
VREFU_L, VREFL_H, and VREFL_L and AGND PCB
pads. The voltages on these four pads MUST be cap-
tured and typed into the appropriate edit boxes in the
Reference Voltages (V)
group box for the calculated
DAC output voltages shown in the
Upper DAC
Channels
and
Lower DAC Channels
group boxes to
be correct.
The transfer function for the upper DAC channels is:
V
OUT
=
VREFU_L
+
D
×
(VREFU_H - VREFU_L)
256
V
COM
Calibration
V
COM
calibration is controlled using the scrollbar and
edit box of the
DVR_OUT
group box (see the
Hardware
Configuration for V
COM
Calibration
section to make use
of this feature). The register value for the 7-bit DAC
controls the DVR_OUT sink current adjusting the volt-
age at the DVR_OUT pin as follows:
R20
⎛
⎞ ⎛
⎛
D
+
1
⎞ ⎛
R19
⎞ ⎞
V
DVR
= ⎜
⎟ × ⎜
1
− ⎜
128
⎟ × ⎜
20
×
R 28
⎟ ⎟ ×
AVDD
⎠⎠
⎝
R19
+
R20
⎠ ⎝
⎝
⎠ ⎝
where D is the DVR_OUT 7-bit register value and AVDD
is the voltage at the AVDD PCB pad.
A serial interface can be used by advanced users by
clicking
Options | Interface (Advanced Users)
from
the menu bar.
Click on the
2-wire interface
tab shown in Figure 2.
Press the
Hunt for active listeners
button to obtain the
current MAX9694 slave address in the
Target Device
Address:
combo box. In the
General commands
tab
select
1 – SMBusWriteByte(addr,cmd,data8)
in the
Command (SMBus Protocols, Raw Block Read/Write,
EEPROM Read/Write)
drop-down list. Enter the desired
values into the
Command byte:
and
Data Out:
combo
boxes and then press the
Execute
button.
The transfer function for the lower DAC channels is:
V
OUT
=
VREFL_L
+
D
×
(VREFL_H - VREFL_L)
256
Advanced User Interface
In both equations, D is the register’s decimal value.
Refer to the MAX9694 IC data sheet for more details.
When the evaluation software is run for the first time,
the reference input-voltage values in the
Reference
Voltages (V)
group box are loaded from an initialization
file (REF.INI). When the program is closed, the current
values are logged into the initialization file. The next
time the program is run, the latest values are loaded
automatically.
Detailed Description of Hardware
The MAX9694 EV kit demonstrates the MAX9694 refer-
ence voltage generator in a 32-pin TQFN surface-
mount package with an exposed pad. EV kit
applications include gamma correction in TFT-LCD
panels, such as those found in high-resolution TVs,
high-end monitors, or for general industrial reference
voltage generation. Using four input reference voltages
(DAC reference inputs), the MAX9694 EV kit provides
14 programmable reference voltage outputs (DAC out-
5
Output Register Values
Each DAC channel’s register value can be set in three
ways within the
Upper DAC Channels
and
Lower DAC
Channels
group boxes by:
• Moving the channel’s scrollbar.
•
•
Typing register values directly into the channel’s
Reg Value
edit box (decimal 8-bit equivalent).
Typing the expected output voltage in the channel’s
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