Electronic Components Datasheet Search |
|
ADM8840 Datasheet(PDF) 1 Page - Analog Devices |
|
ADM8840 Datasheet(HTML) 1 Page - Analog Devices |
1 / 10 page ADM8840 REV. PrG 2/03 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 Analog Devices, Inc., 200 3 Charge Pump Regulator & COM Driver for Color TFT Panel Preliminary Technical Data PRELIMINARY TECHNICAL DATA a FEATURES Programmable COM Driver to prevent Screen-Burn 3 Voltages (5.0V,15.0V,-15.0V) from one 3V Supply Power Efficiency optimised for use with TFT in mobile phones Low Quiescent Current Low Shutdown Current (<5uA) Shutdown Function APPLICATIONS Handheld Instruments TFT LCD Panels Cellular Phones GENERAL DESCRIPTION The ADM8840 combines a charge pump regulator and a Common Line (COM) driver in a single chip solution for use in TFT LCD’s. The device provides an LCD controller and grayscale DAC supply voltage of 5.0V (±2%), 2 gate drive voltages of +15V and -15V and a COM driver voltage. This COM Driver voltage alternates the polarity of the Common line voltage every line (or every frame) on the display in order to prevent screen-burn occuring over time. The ADM8840 is powered by a single 3.0V supply. The ADM8840 has an internal 100KHz oscillator for driving the charge pumps. The COM Driver section of the ADM8840 can be used to generate the alternate frame or line inversion of the COM line of the LCD panel. The ADM8840 receives the COM clock from the controller with a frequency up to 10kHz and allows programmable conditioning of its amplitude and centre voltage through the use of on-board DAC’s. This allows programmable elimination of display flicker caused by the COM inversion. The COM_OUT amplitude can be programmed from 4.0V to 7.0V in steps of 28mV. The COM_OUT centre voltage can be programmed to 0.9V to 2.8V in steps of 14mV. TM Green Idle is a registered trademark of Analog Devices Inc. The ADM8840 provides power up sequencing of the -15V and +15V gate drive outputs, ensuring the -15V starts to power up before the +15V. The ADM8840 has a number of power save features, includ- ing low power Shutdown. The 5.0V output consumes the most power, so Power Efficiency is also maximised on this output with an oscillator enabling scheme (Green Idle TM). The ADM8840 is fabricated using CMOS technology for minimal power consumption. The part is packaged in a 32- pin LFCSP package. FUNCTIONAL BLOCK DIAGRAM SERIAL INTERFACE VREF DAC 1 DAC 2 8 8 CLK DATA CS / LDAC LEVEL TRANSLATOR PO WER BUFFER + - - + COM_IN 4.7 F 4.7 F C PANEL 5.5k 4.7 F OS CILLATOR CONTROL LOGIC TIMING GENERATOR SHUTDOWN CONTROL DISCHARGE VOLTAGE DOUBLER C1+ C1- SHDN VCC LDO VOLTAGE REGULATOR 5VOUT 2.2 F C7 DOUBLE TRIP LE VOLTAGE TRIPLER VOLTAGE INVERTER C2+ C2- C3+ C3- VOUT VOLTAGE ADDER C5+ C5- +15V C4+ C4- -15V ADM8840 0.22 F 3.3 F 3.3 F 3.3 F 0.22 F 0.22 F 0.22 F 0.22 F DAC1_SD DAC1_IN INT/EXT DAC 1 INT/EXT DAC 2 DAC2_SD DAC2_IN C4 C2 C3 C9 C8 ADD_OUT TRANS_OUT COM_OUT_AC COM_OUT GND C5 C10 C11 C12 C13 4.7 F C6 C1 22nF 5VIN +5V |
Similar Part No. - ADM8840 |
|
Similar Description - ADM8840 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |