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AD7843ARQ-REEL Fiches technique(PDF) 1 Page - Analog Devices |
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AD7843ARQ-REEL Fiches technique(HTML) 1 Page - Analog Devices |
1 / 16 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD7843 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., 2000 Touch Screen Digitizer FUNCTIONAL BLOCK DIAGRAM PEN INTERRUPT DCLK GND +VCC BUSY PENIRQ SAR + ADC CONTROL LOGIC SPORT CS DOUT DIN 4-TO-1 I/P MUX AD7843 +VCC IN3 VREF IN4 Y– Y+ X– X+ T/H CHARGE REDISTRIBUTION DAC COMP GENERAL DESCRIPTION The AD7843 is a 12-bit successive-approximation ADC with a synchronous serial interface and low on resistance switches for driving touch screens. The part operates from a single 2.2 V to 5.25 V power supply and features throughput rates greater than 125 kSPS. The external reference applied to the AD7843 can be varied from 1 V to +VCC, while the analog input range is from 0 V to VREF. The device includes a shutdown mode that reduces the current consumption to less than 1 µA. The AD7843 features on-board switches. This coupled with low power and high-speed operation make this device ideal for battery-powered systems such as personal digital assistants with resistive touch screens and other portable equipment. The part is available in a 16-lead 0.15" Quarter Size Outline (QSOP) pack- age and a 16-lead Thin Shrink Small Outline (TSSOP) package. FEATURES 4-Wire Touch Screen Interface Specified Throughput Rate of 125 kSPS Low Power Consumption: 1.37 mW Max at 125 kSPS with VCC = 3.6 V Single Supply, VCC of 2.2 V to 5.25 V Ratiometric Conversion High-Speed Serial Interface Programmable 8- or 12-Bit Resolution Two Auxiliary Analog Inputs Shutdown Mode: 1 A max 16-Lead QSOP and TSSOP Packages APPLICATIONS Personal Digital Assistants Smart Hand-Held Devices Touch Screen Monitors Point-of-Sales Terminals Pagers PRODUCT HIGHLIGHTS 1. Ratiometric conversion mode available eliminating errors due to on-board switch resistances. 2. Maximum current consumption of 380 µA while operating at 125 kSPS. 3. Power-down options available. 4. Analog input range from 0 V to VREF. 5. Versatile serial I/O port. |
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Description similaire - AD7843ARQ-REEL |
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