MAX9694ETJ+ Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX9694ETJ+
14 Programmable Gamma Reference Buffers with Four Static References for TFT LCDs
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 VCOMvoltage 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-I2C 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 I2C interface cir-
cuit for stand-alone MAX9694 operation.
Features14 8-Bit Programmable Reference Voltages (DAC
Outputs)Four Static Buffered Reference Voltages
(Reference Outputs)Programmable VCOMVoltage Calibration400mA Peak Current on Reference Outputs and
DAC Outputs 1, 7, 8, and 14200mA Peak Current on DAC Outputs 2–6 and 9–13Peak Output Currents
400mA: 4 DAC Outputs and 4 DAC Reference
Outputs
200mA: 10 DAC Outputs9V to 20V DC Power-Supply OperationUSB-Powered USB-to-I2C Interface CircuitWindows 2000/XP/Vista (32-Bit)-Compatible SoftwareLead-Free and RoHS CompliantProven PCB LayoutFully Assembled and Tested
Evaluates: MAX9694
MAX9694 Evaluation Kit
19-4313; Rev 0; 10/08
Component List
Ordering Information
DESIGNATIONQTYDESCRIPTION
C1–C180Not installed, ceramic capacitors
(0603)
C19, C21, C23,
C25, C27–C34,
C40, C41, C42
0.1μF ±10%, 25V X7R ceramic
capacitors (0603)
Murata GRM188R71E104K or
TDK C1608X7R1E104K
C20, C26, C45,
C474
10μF ±10%, 10V X7R ceramic
capacitors (0805)
Murata GRM21BR71A106K
C22, C242
10μF ±10%, 25V X5R ceramic
capacitors (1206)
Murata GRM31CR61E106K
C35, C362
10pF ±5%, 50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H100J or
TDK C1608C0G1H100J
DESIGNATIONQTYDESCRIPTION
C371
3300pF ±10%, 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H332K or
TDK C1608X7R1H332K
C38, C392
22pF ±5%, 50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H220J or
TDK C1608C0G1H220J
C43, C44, C463
1μF ±10%, 10V X5R ceramic
capacitors (0603)
Murata GRM188R61A105K or
TDK C1608X5R1A105K1Green LED (0603)
Panasonic LNJ314G8TRA
FB10Not installed, ferrite-bead inductor
(0603)
PARTTYPE
MAX9694EVKIT+EV Kit
Windows and Windows Vista are registered trademarks of
+Denotes lead-free and RoHS compliant.
Evaluates: MAX9694
MAX9694 Evaluation Kit
Component List (continued)
DESIGNATIONQTYDESCRIPTION0Not installed, dual-row (2 x 20)
40-pin header0Not installed, dual-row (2 x 2)
4-pin header
JU113-pin header
JU215-pin header
OU T_1–O U T_14,
OUTREFUH,
OUTREFUL,
OUTREFLH,
OUTREFLLNot installed, small PCB test points
R1–R20,
R29–R46, R580
Not installed, resistors (0603)
R1–R20, R58 are open;
R29–R46 are short
R21, R252100Ω ±1% resistors (0603)
R22, R2424.32kΩ ±1% resistors (0603)
R2311.21kΩ ±1% resistor (0603)
R26, R27, R50,
R54, R5552.2kΩ ±5% resistors (0603)
R2813.3kΩ ±1% resistor (0603)
R47, R48227Ω ±5% resistors (0603)
R4911.5kΩ ±5% resistor (0603)
R51110kΩ ±5% resistor (0603)
R521220Ω ±5% resistor (0603)
R530Not installed, resistor (0402)
R5910Ω ±5% resistor (0603)
DESIGNATIONQTYDESCRIPTION1
Reference voltage generator
(32 TQFN-EP*)
Maxim MAX9694ETJ+1
Low-power 16-bit microcontroller
(68 QFN-EP*)
Maxim MAXQ2000-RAX+193C46 3-wire 16-bit EEPROM (8 SO)1UART-to-USB converter (32 TQFP)1
3.3V regulator (5 SC70)
Maxim MAX8511EXK33+T
(Top Mark: AEI)1
2.5V regulator (5 SC70)
Maxim MAX8511EXK25+T
(Top Mark: ADV)1
Dual bidirectional level translators
(8 TDFN-EP*)
Maxim MAX3394EETA+T
(Top Mark: APE)
USB1USB type-B right-angle female
receptacle116MHz crystal16MHz crystal2Shunts (JU1, JU2)1PCB: MAX9694 Evaluation Kit+
*EP = Exposed pad.
Component Suppliers
SUPPLIERPHONEWEBSITE
Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com
Panasonic Corp. 800-344-2112 www.panasonic.com
TDK Corp. 847-803-6100 www.component.tdk.com
Note:Indicate that you are using the MAX9694 when contacting these component suppliers.
Evaluates: MAX9694
MAX9694 Evaluation Kit
MAX9694 EV Kit Files
FILESDESCRIPTION
INSTALL.EXE Installs the EV kit files on your computer
MAX9694.EXE Application program
REF.INI Software Initialization File
FTD2XX.INF USB device driver file
UNINST.INI Uninstalls the EV kit software
USB_Driver_Help.PDF USB driver installation help file
Quick Start
Required Equipment
Before beginning, the following equipment is needed:MAX9694 EV kit (USB cable included)A user-supplied Windows2000/XP- or Windows
Vista-compatible PC with a spare USB port9V to 20V DC power supply @ 500mAOne 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
underlinedrefers 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:Visit /evkitsoftwareto 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.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.Connect the USB cable from the PC to the EV kit
board. A New Hardware Foundwindow 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.Follow the directions of the Add New Hardware
Wizardto install the USB device driver. Choose the
Search for the best driver for your deviceoption.
Specify the location of the device driver to be
C:\Program Files\MAX9694(default installation
directory) using the Browsebutton. 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.Once the software and hardware installation is com-
plete, disconnect the USB cable from the EV kit.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)Connect the USB cable to the EV kit.Connect the DVM negative terminal to the AGND
PCB pad next to the VREFL_L PCB pad.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 | Programsmenu. 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.
Evaluates: MAX9694
15)Press the Quick Startbutton.
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.
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 Settingdrop-down list and in the soft-
ware status bar. The DAC output voltages in the Upper
DAC Channelsand Lower DAC Channelsgroup
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
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 Startbutton or perform the following steps:Modify any of the DAC channel’s register values.
Register values are modified using the edit boxes
and scrollbars of the Register Settingstab. See
the Output Register Valuessection for more infor-
mation.Press the Load All Values To Registersbutton.
The Quick Startbutton loads all registers with the val-
ues shown in Figure 1.
MAX9694 Evaluation Kit
Figure 1. MAX9694 Evaluation Software Main Window
2C Address SettingThe MAX9694’s I2C slave address is displayed in the
I2C Address Settingdrop-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 Addresscheckbox is checked, the soft-
ware automatically detects the I2C address of the
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
Channelsand Lower DAC Channelsgroup boxes to
be correct.
The transfer function for the upper DAC channels is:
The transfer function for the lower DAC channels is:
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.
Output Register Values
Each DAC channel’s register value can be set in three
ways within the Upper DAC Channels and LowerDAC
Channelsgroup boxes by:Moving the channel’s scrollbar.Typing register values directly into the channel’s
Reg Valueedit box (decimal 8-bit equivalent).Typing the expected output voltage in the channel’s
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 Registersbutton.
The Load All Reg Values From Filebutton is used to
load all the register values and reference voltages from
a user-selected text file. The Save All Reg Values To
Filebutton is used to save all the register values and
reference voltages on the current GUI to a user-named
text file.
VCOMCalibration
VCOMcalibration is controlled using the scrollbar and
edit box of the DVR_OUTgroup box (see the Hardware
Configuration for VCOMCalibrationsection 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:
where D is the DVR_OUT 7-bit register value and AVDD
is the voltage at the AVDD PCB pad.
Advanced User InterfaceA serial interface can be used by advanced users by
clicking Options | Interface (Advanced Users)from
the menu bar.
Click on the 2-wire interfacetab shown in Figure 2.
Press the Hunt for active listenersbutton to obtain the
current MAX9694 slave address in the Target Device
Address:combo box. In the General commandstab
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 Executebutton.
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-R20
R19R201D1
R19DVR=+⎜⎞⎟×−+⎛⎜⎞⎟××RR28AVDD⎛⎜⎞⎟⎛⎜⎞⎟×REFL_LD
256(VREFL_H-VREFL_L)OUT=+×V
VREFU_LD
256(VREFU_H-VREFU_L)OUT=+×V
Evaluates: MAX9694
MAX9694 Evaluation Kit
puts), four static buffered reference voltage outputs
(reference outputs), and a 7-bit DVR output for calibrat-
ing a VCOMvoltage.
To monitor the MAX9694 EV kit’s 14 DAC outputs
(OUT1–OUT14), and four reference outputs
(OUT_REFU_H, OUT_REFU_L, OUT_REFL_H, and
OUT_REFL_L), use header J1 or the labeled test points.
Reference outputs OUT_REFU_H, OUT_REFU_L,
OUT_REFL_H, OUT_REFL_L and DAC outputs OUT1,
OUT7, OUT8, and OUT14 provide 400mA of peak cur-
rent. DAC outputs OUT2–OUT6 and OUT9–OUT13 pro-
vide 200mA of peak current. Please stay within the
MAX9694 IC’s power rating. Refer to the MAX9694 IC
The on-board resistor-divider network (R21–R25) gen-
erates the reference inputs (REFU_H, REFU_L,
REFL_H, and REFL_L). The user can also apply exter-
nal reference voltages to the VREFU_H, VREFU_L,
VREFL_H, and VREFL_L PCB pads after removing
resistors R21–R25.
The EV kit uses a 9V to 20V DC power supply, connect-
ed across the AVDD and AGND PCB pads, for powering
the EV kit application circuit. The EV kit may require up to
500mA of supply current depending on output loading.
Evaluates: MAX9694
MAX9694 Evaluation Kit
Figure 2. Advanced I2C User Interface Window (2-Wire Interface Tab)

Partno	Mfg	Dc	Qty	Available	Descript
MAX9694ETJ+	MAXIM	N/a	2490	avai	14 Programmable Gamma Reference Buffers with Four Static References for TFT LCDs