Regulator and COM driver for colour TFT panel

23 April 2003 Power Electronics / Power Management

The ADM8840 device from Analog Devices features a common line (COM) driver in a single-chip solution for TFT LCDs. The device provides an LCD controller and grayscale DAC supply voltage of 5,0 V ±2% and two gate drive voltages of ±15 V. The COM driver voltage alternates the polarity of the common line voltage every line or every frame on the display to prevent screen burn occurring over time. The ADM8840 is powered by a single 2,7 to 3,6 V supply.

The ADM8840 receives the COM clock from the controller with a frequency as high as 10 kHz and allows programmable conditioning of its amplitude and centre voltage through the use of on-board DACs. The ADM8840 is fabricated using CMOS technology for minimal power consumption. The part comes in a 32-pin LFCSP package with a 5 mm x 5 mm footprint.

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