MAX9590 Datasheet, PDF (1/1 Pages) Maxim Integrated Products – 14 Programmable Gamma Reference Buffers with 4 Static References for TFT-LCD Displays

XX-XXXX; Rev 0; 4/06
14 Programmable Gamma Reference Buffers with
4 Static References for TFT-LCD Displays
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 I²C* 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.
Applications
TFT-LCD Displays
Industrial Reference Voltage Generators
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
PKG
CODE
MAX9590ETU+ -40°C to +85°C
+Denotes lead-free package.
38 TQFN
(5mm x 7mm)
T3857-1
*Purchase of I²C components from Maxim Integrated Products,
Inc. or one of its sublicensed Associated Companies, conveys
a license under the Philips I²C Patent Rights to use these com-
ponents in an I²C system, provided that the system conforms
to the I²C Standard Specification as defined by Philips.
Features
o 14 Programmable Reference Voltages
o 4 Static Reference Voltages
o Independent DACs with 8-Bit Resolution
o Two Register Banks for Two Sets of
Gamma Values
o Fast Switching between Gamma Values
o 16.5V (max) Operating Voltage
o Output Swing within 150mV of Rails
o Peak Current Greater than 200mA
o Output Channels Tri-Stated During Wake-Up
Block Diagram
REFU_H
AVDD
DVDD
GND
CAP
BANK A
MEMORY
(HIGH)
BANK B
MEMORY
(HIGH)
REFU_L
BANK_SEL
REFL_H
BANK A
MEMORY
(LOW)
REFL_L
SCL
SDA
A0
STD_REG
BANK B
MEMORY
(LOW)
I²C INTERFACE
MAX9590
OUT_REFU_H
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
OUT_REFU_L
OUT_REFL_H
OUT8
OUT9
OUT10
OUT11
OUT12
OUT13
OUT14
OUT_REFL_L
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