MAX9669

19-4326; Rev 4; 8/11 MAX9669 10-Bit Programmable Gamma Reference System with MTP for TFT LCDs General Description The MAX9669 outputs 16 voltage references for gamma correction in TFT LCDs and one voltage reference for VCOM. Each gamma reference voltage has its own 10bit 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 MAX9669 features integrated multiple-time programmable (MTP) memory to store gamma and VCOM values on the chip, eliminating the need for external EEPROM. The MAX9669 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. TFT LCDs Applications Pin Configuration TOP VIEW AGND AVDD GMA8 GMA7 GMA6 GMA5 GMA4 21 20 19 18 17 16 15 GMA9 22 GMA10 23 GMA11 24 GMA12 25 GMA13 26 GMA14 27 GMA15 28 + MAX9669 EP* 14 GMA3 13 GMA2 12 GMA1 11 AGND 10 AVDD 9 AVDD_AMP 8 VCOM_FB 1 234567 GMA16 SCL SDA A0 DVDD AGND_AMP VCOM THIN QFN (5mm × 5mm) *EP = EXPOSED PAD, CONNECT EP TO DIGITAL GROUND PLANE. Features o 16-Cha...