High Performance, 12-Bit, 12-Channel Decimating, LCD DecDriver AD8387 FEATURES FUNCTIONAL BLOCK DIAGRAM High accuracy, high-resolution voltage outputs 12 12 12 TWO-STAGE 1 mV channel matching DBA(0:11) DAC VID0 LATCH 12-bit input resolution 12 12 12 TWO-STAGE DBB(0:11) DAC VID1 Laser-trimmed outputs LATCH Fast settling, high voltage drive 35 ns settling time to 0.25% into 150 pF load BYP BIAS Slew rate 420 V/s THERMAL TSW Outputs to within 1.3 V of supply rails SWITCH 12 12 TWO-STAGE DAC VID10 High update rates LATCH G-MODE GSW SWITCH Fast, 110 MHz clock 12 12 TWO-STAGE DAC VID11 LATCH Programmable video reference (brightness) and DSW full-scale (contrast) output levels CLK SEQUENCE Flexible logic XFR CONTROL R/L SCALING INV bit reverses polarity of video signal CONTROL R/L reverses loading order of data AD8387 ISW selects frame/row or column/dot inversion INV ISW VRH VRL DSW selects single or dual data bus mode Figure 1. Output short-circuit protection 3.3 V logic, 11 V to 18 V analog supplies Available in 80-lead, 12 mm 12 mm, TQFP E-pad APPLICATIONS LCD microdisplay driver GENERAL DESCRIPTION 5 The AD8387 DecDriver provides dual, fast latched, 12-bit decimating input, which drives 12 high voltage outputs. Twelve- bit input words are loaded into 12 separate high speed, bipolar 4 DACs sequentially. Flexible digital input format allows more than one AD8387 to be used in parallel for higher resolution 3 NORMAL PROJECTOR OPERATING displays. The output signal can be adjusted for dc reference, TEMPERATURE RANGE CODE 0 signal inversion, and contrast for maximum flexibility. 2 CODE 2048 The AD8387 is fabricated on ADIs fast bipolar, 26 V XFCB process, providing fast input logic, bipolar DACs with trimmed 1 CODE 4095 accuracy and fast settling, high voltage, precision drive amplifiers on the same chip. 0 0 10 20 30 40 50 60 70 80 The AD8387 dissipates 1.34 W nominal static power. The INTERNAL AMBIENT TEMPERATURE (C) AD8387 is offered in an 80-lead TQFP E-pad package and Figure 2. Channel Matching vs. Temperature operates over the commercial temperature range of 0C to +85C. 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. VDE CHANNEL MATCHING (mV) 05653-015 05653-001AD8387 TABLE OF CONTENTS Features .............................................................................................. 1 Theory of Operation ...................................................................... 13 Applications....................................................................................... 1 Transfer Function and Analog Output Voltage...................... 13 Functional Block Diagram .............................................................. 1 Accuracy...................................................................................... 13 General Description ......................................................................... 1 Applications..................................................................................... 14 Revision History ............................................................................... 2 Optimized Reliability with the Thermal Switch .................... 14 Specifications..................................................................................... 3 Initial Power-Up After Assembly or Repair............................ 14 Absolute Maximum Ratings............................................................ 5 Power-Up During Normal Operation ..................................... 14 Exposed Paddle............................................................................. 5 Power Supply Sequencing ......................................................... 14 Overload Protection..................................................................... 5 Power-On Sequence................................................................... 14 Maximum Power Dissipation ..................................................... 5 Power-Off Sequence................................................................... 14 Operating Temperature Range ................................................... 5 Grounded Output Mode During Power-Off .......................... 14 ESD Caution.................................................................................. 5 PCB Design for Optimized Thermal Performance ............... 14 Pin Configuration and Function Descriptions............................. 6 Thermal Pad Design .................................................................. 15 Typical Performance Characteristics ............................................. 8 Thermal via Structure Design .................................................. 15 Timing Diagrams.............................................................................. 9 AD8387 PCB Design Recommendations ............................... 15 Single Data Bus Configuration, DSW = LOW ......................... 9 Outline Dimensions ....................................................................... 16 Dual Data Bus Configuration, DSW = HIGH........................ 10 Ordering Guide .......................................................................... 16 Functional Description .................................................................. 12 Reference and Control Input Description............................... 12 REVISION HISTORY 10/05Revision 0: Initial Version Rev. 0 Page 2 of 16