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MAX9668 Datasheet Preview

MAX9668 Datasheet

LCD Gamma Buffer

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MAX9668 pdf
MAX9668 LCD Gamma Buffer
Description
The MAX9668 outputs eight voltage references for gamma correction in TFT LCDs and one voltage
reference for VCOM. Each gamma reference voltage has its own 10-bit digital-to-analog converter (DAC) and
buffer to ensure a stable voltage. The VCOM reference voltage has its own 10-bit DAC and an amplifier to
ensure a stable voltage when critical levels and patterns are displayed. The MAX9668 features integrated
multiple-time programmable (MTP) memory to store gamma and VCOM values on the chip, eliminating the
need for external EEPROM. The MAX9668 supports up to 100 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.
Key Features
8-Channel Gamma Correction 10-Bit Resolution
VCOM Driver
Integrated MTP Memory
One Memory Banks
Programmable VCOM Limits
VCOM Buffer
Interface I2C
1µs Settling Time
20V Maximum Analog Supply Voltage (VSUPPLY: 9 to 20V)
200mA Peak Current on Gamma Channels
600mA Peak Current on VCOM Channel
Oper. Temp. -40 to +125
Package/Pins: TQFN/20
Applications/Uses
TFT LCDs
1



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MAX9668 Datasheet Preview

MAX9668 Datasheet

LCD Gamma Buffer

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MAX9668 pdf
Diagram
2


Part Number MAX9668
Description LCD Gamma Buffer
Maker ETC
Total Page 2 Pages
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