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ADD8702 Datasheet(PDF) 1 Page - Analog Devices |
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ADD8702 Datasheet(HTML) 1 Page - Analog Devices |
1 / 8 page REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective companies. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rights reserved. ADD8702 12-Channel Gamma Buffers with VCOM Buffer PANEL TIMING CONTROLLER TIMING AND CONTROL SCAN DRIVER CONTROL GAMMA REFERENCE VOLTAGES GAMMA VCOM R 384 SOURCE DRIVER NO. 1 768 SCAN DRIVERS TFT COLOR PANEL 1024 768 384 SOURCE DRIVER NO. 2 384 SOURCE DRIVER NO. 8 ADD8702 G B Figure 1. Typical SVGA TFT LCD Application FUNCTIONAL BLOCK DIAGRAM GND VDD VGMA6 VGMA5 VGMA4 VGMA3 VGMA2 VGMA1 24 23 22 21 20 19 18 17 VDD VCOM ADJ VHIGH VIN11 VIN10 VIN9 VIN8 VIN7 9 10 11 12 13 14 15 16 32 31 30 26 28 27 26 25 1 2 3 4 5 6 7 8 FEATURES Programmable 12-Channel Gamma Reference Generator Mask Programmable Adjustable VCOM Buffer Upper/Lower Outputs Swing to VDD/GND Continuous Output Current: 10 mA VCOM Peak Output Current: 250 mA Outputs with Fast Settling Time for Load Change Output Pins Are Compatible with ADD8701 Single-Supply Operation: 7 V to 16 V Supply Current: 15 mA Max APPLICATIONS TFT LCD Panels GENERAL DESCRIPTION The ADD8702 is a low cost, mask programmable, 12-channel gamma reference generator, plus an adjustable VCOM driver. This part is designed to provide gamma correction for high resolution TFT LCD panels. The 12 gamma reference levels and VCOM are mask programmable to 0.3% resolution using the on-chip 500 chain resistor string. This reduces component and board costs. The ADD8702 provides a complete programmed set of gamma voltage references for the LCD source drivers. These references settle quickly to load change. The VCOM output is stable with high capacitive loads and can source or sink 250 mA peak cur- rent. The VCOM output level can be adjusted using an external trim-potentiometer or discrete resistors. The output pins are compatible with the ADD8701. This allows for single board design and fast turns for prototyping using the initial ADD8701 board design. The ADD8702 is specified over the temperature range of –40 °C to +85 °C and comes in the 32-lead lead frame chip scale pack- age (LFCSP) for compact board space. |
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