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MAX9679

12-Channel, 10-Bit Programmable Gamma and VCOM Reference Voltages

Industry's Most Accurate Gamma Curve Reference System

Data Sheet (Rev. 2)

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Overview

12 Channels of Programmable Gamma Voltages with 10-Bit Resolution
Programmable VCOM Voltage with 10-Bit Resolution
Programmable Reference for DACs
Multiple-Time Programmable Memory to Store Gamma and VCOM Codes
Switching Between Two Gamma Curves and VCOM Voltages
AVDD1, AVDD2, and AVDD_AMP Supplies to Reduce Heat
I²C Interface (1MHz Fast-Mode Plus)

The MAX9679 provides multiple programmable reference voltages for gamma correction in TFT LCDs and a programmable reference voltage for VCOM adjustment. All gamma and VCOM reference voltages have a 10-bit digital-to-analog converter (DAC) and high-current buffer, which reduces the recovery time of the output voltages when critical levels and patterns are displayed. A programmable internal reference sets the full-scale voltage of the DACs.

Two independent sets of gamma curves and VCOM codes can be stored in the IC's volatile memory; BKSEL signal selects between the two sets.

The IC has multiple-time programmable (MTP) memory to store gamma and VCOM codes on the chip, eliminating the need for external EEPROM.

Applications