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MAX9673ETI Datasheet PDF : 24 Pages
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19-4718; Rev 4; 2/11
EVAALVUAAILTAIOBNLEKIT
10-Bit, Programmable Gamma Reference
Systems with MTP for TFT LCDs
General Description
The MAX9672/MAX9673/MAX9674 output 12/14/16 volt-
age references for gamma correction in TFT LCDs and
one voltage reference for VCOM. Each gamma refer-
ence voltage has its own 10-bit DAC and buffer to
ensure a stable voltage. The VCOM reference voltage
has its own 10-bit DAC and an amplifier to ensure a sta-
ble voltage when critical levels and patterns are dis-
played. The MAX9672/MAX9673/MAX9674 feature
integrated multiple-time programmable (MTP) memory to
store gamma and VCOM values on the chip, eliminating
the need for external EEPROM. The MAX9672/
MAX9673/MAX9674 support up to 300 write operations
to the on-chip nonvolatile memory.
The gamma outputs can drive 200mA peak transient
current and settle within 1µs. The VCOM output can
provide 600mA peak transient current and also settles
within 1µs. The analog supply voltage range extends
from 9V to 20V, and the digital supply voltage range
extends from 2.7V to 3.6V.
Gamma values and the VCOM value are programmed
into registers through the I2C interface.
Applications
TFT LCDs
Pin Configuration
TOP VIEW
21 20 19 18 17 16 15
GMA9 22
GMA10 23
GMA11 24
GMA12 25
GMA13* 26
MAX9672
MAX9673
MAX9674
GMA14* 27
+
EP†
GMA15** 28
14 GMA3
13 GMA2
12 GMA1
11 GND
10 AVDD
9 AVDD_AMP
8 VCOM_FB
1 234567
THIN QFN
(5mm × 5mm)
†EP = EXPOSED PAD, CONNECT EP TO GROUND PLANE.
*N.C. FOR THE MAX9672
**N.C. FOR THE MAX9672 AND THE MAX9673
Features
o DAC Reference Input
o 12/14/16-Channel Gamma Correction, 10-Bit
Resolution
o VCOM Driver
o Integrated MTP Memory
o Programmable VCOM Limits
o 200mA Peak Current on Gamma Channels
o 600mA Peak Current on VCOM Channel
Ordering Information
PART
GAMMA
CHANNELS
PIN-PACKAGE
MAX9672ETI+
12
28 TQFN-EP*
MAX9673ETI+
14
28 TQFN-EP*
MAX9674ETI+
16
28 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Note: All devices are specified over the -40°C to +85°C temper-
ature range.
Functional Diagram
REF
AVDD
MTP
MEMORY
10
10
10
10
10
10
10
10
I2C
10
REGISTERS
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
DAC
10
REGISTERS
10
10
10
10
10
10
10
10
10-BIT
DAC
10-BIT
DAC
10-BIT
DAC
10-BIT
DAC
10-BIT
DAC
10-BIT
DAC
10-BIT
DAC
10-BIT
DAC
10-BIT
DAC
10-BIT
DAC
10-BIT
DAC
10-BIT
DAC
10-BIT
DAC
10-BIT
DAC
10-BIT
DAC
10-BIT
DAC
10-BIT
DAC
DVDD
SDA
SCL
A0
GND
I2C
INTERFACE
*NOT AVAILABLE FOR THE MAX9672
**NOT AVAILABLE FOR THE MAX9672 AND THE MAX9673
MAX9672
MAX9673
MAX9674
GND
GMA1
GMA2
GMA3
GMA4
GMA5
GMA6
GMA7
GMA8
GMA9
GMA10
GMA11
GMA12
GMA13*
GMA14*
GMA15**
GMA16**
AVDD_AMP
VCOM
AGND_AMP
VCOM_FB
________________________________________________________________ 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.
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