Maxim MAX9694 TFT LCD电源方案
The MAX9694 provides four static voltage references and 14 programmable voltage references for gamma correction in TFT LCDs. The MAX9694 also features a 7-bit digital variable resistor (DVR) for VCOM calibration in TFT LCDs. Gamma and DVR values are programmed into the registers through an I²C interface.
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 channel has a static 8-bit digital-to-analog converter (DAC) and an isolation buffer to ensure stable reference voltages. This architecture reduces the effects of power-supply noise and kickback current from the source driver chips. Each buffer provides a high peak current to reduce the recovery time of the output voltages when critical levels and patterns are displayed.
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