MAX9590
14 Programmable Gamma Reference Buffers with
4 Static References for TFT-LCD Displays
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
XX-XXXX; Rev 0; 4/06
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
+
Denotes lead-free package.
PART
TEMP RANGE
PIN-PACKAGE
PKG
CODE
MAX9590ETU+
-40°C to +85°C
38 TQFN
(5mm x 7mm)
T3857-1
I
2
C INTERFACE
REFU_H
BANK_SEL
REFL_L
SCL
SDA
REFU_L
REFL_H
AV
DD
DV
DD
GND
A0
BANK A
MEMORY
(HIGH)
OUT_REFU_H
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
OUT_REFU_L
OUT_REFL_H
OUT_REFL_L
STD_REG
CAP
OUT8
OUT9
OUT10
OUT11
OUT12
OUT13
OUT14
BANK B
MEMORY
(HIGH)
BANK A
MEMORY
(LOW)
BANK B
MEMORY
(LOW)
MAX9590
Block Diagram
14 Programmable Reference Voltages
4 Static Reference Voltages
Independent DACs with 8-Bit Resolution
Two Register Banks for Two Sets of
Gamma Values
Fast Switching between Gamma Values
16.5V (max) Operating Voltage
Output Swing within 150mV of Rails
Peak Current Greater than 200mA
Output Channels Tri-Stated During Wake-Up
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General Description
The MAX9590 provides 14 programmable voltage
references and 4 static voltage references for gamma
correction in TFT-LCD displays. Two register banks are
provided to store two sets of gamma reference values.
Gamma values are programmed into the banks through
the I
2
C* interface and the outputs can switch between
values in 0.5µs.
The 14 programmable reference voltages are divided
evenly into seven upper and seven lower voltages for the
upper and lower gamma curves of LCD column drivers.
Each gamma reference voltage has an 8-bit DAC and
isolation buffer associated with it to ensure stable
operation. Therefore, the reference voltages remain
stable without synchronizing to the LCD horizontal timing.
In addition, each buffer is able to provide a high current
that further ensures a stable voltage when critical levels
and patterns are displayed.
The 14 programmable buffers wake-up in high-impedance
state until the registers are programmed. This protects
the LCD system from high transient currents during the
startup phase.
The MAX9590 is available in a 38-pin TQFN package
and is specified for operation over the -40°C to +85°C
temperature range.
TFT-LCD Displays
Industrial Reference Voltage Generators
Features
Applications
*Purchase of I
2
C components from Maxim Integrated Products,
Inc. or one of its sublicensed Associated Companies, conveys
a license under the Philips I
2
C Patent Rights to use these com-
ponents in an I
2
C system, provided that the system conforms
to the I
2
C Standard Specification as defined by Philips.
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