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ADD8702ACP-REEL Scheda tecnica(PDF) 7 Page - Analog Devices |
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ADD8702ACP-REEL Scheda tecnica(HTML) 7 Page - Analog Devices |
7 / 8 page REV. 0 ADD8702 –7– APPLICATIONS Figure 1 is a block diagram of the configuration of an XGA- compatible (1024 768) TFT color panel with the ADD8702 providing gamma correction reference voltages to the source drivers and an integrated VCOM driver for LCD common node. BUFFER 16V RNULL CT RL Figure 2. Bandwidth Measurement Information Panel size and resolution determine the number of gamma reference voltages required. For a 256-grayscale level, 8-bit color scheme, 6 2 external reference nodes should be sufficient to match the characteristics of the LCD driver to the characteristics of the actual LCD panel for improved picture quality. External reference gamma correction voltages are often generated using a simple resistor ladder. Using the ADD8702, the resistor ladder is incorporated in the IC for reduced cost and number of components. BUFFER 16V 5V 33 1k 10V 5V 0V 0.1 s VTH VTH Figure 3. Transient Load Regulation Test Circuit The ADD8702 is designed to meet the rail-to-rail capability needed by the application, yet offers the lowest cost per channel solution. The ADD8702 gamma buffers offer 10 mA continuous drive current capability. To be more competitive, the design maximizes the die area by allowing specific channels to swing to the positive rail and negative rail. So it is imperative that the channels swinging close to the supply rail be used for the posi- tive gamma references and the channels swinging close to GND be used for the negative gamma references. The VCOM buffer can handle up to 35 mA continuous output current and can drive up to 1,000 pF pure capacitive load. Provision is available to adjust the VCOM voltage to a desired level. Refer to Figure 4 for an example of an application circuit for adjusting the output of the VCOM buffer. GMA 12 GMA 11 GMA 10 GMA 9 GMA 8 GMA 7 GMA 6 GMA 5 GMA 4 GMA 3 GMA 2 GMA 1 ADD8702 LCD SOURCE DRIVER A1 LCD COMMON PLANE VCOM AMP 2k 32k VDD GND VCOM ADJUST A5 A4 A3 A2 A10 A8 A7 A6 A9 A12 A11 VLOW VIN5 VIN4 VIN3 VIN2 VIN10 VIN8 VIN7 VIN6 VIN9 VHIGH VIN11 Figure 4. Application Circuit Table I. ADD8702 – 000 Mask Option, Resistor Tap Points (0 ≤ ≤ 500) V DD = 12.5 V, VHIGH = 12.5 V, and VLOW = GND Tap Point ( ) Voltage Unit VGMA1 8 0.2 V VGMA2 57 1.43 V VGMA3 84 2.11 V VGMA4 115 2.89 V VGMA5 139 3.48 V VGMA6 194 4.86 V VGMA7 218 5.45 V VGMA8 298 7.45 V VGMA9 371 9.29 V VGMA10 418 10.45 V VGMA11 442 11.04 V VGMA12 488 12.2 V VCOM 200 5 V |
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