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

The MAX9679B 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

* TFT LCDs

* 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 AVDDAMP Supplies to Reduce Heat

* I²C Interface (1MHz Fast-Mode Plus)