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AD7843ARQZ2 Datasheet(PDF) 1 Page - Analog Devices |
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AD7843ARQZ2 Datasheet(HTML) 1 Page - Analog Devices |
1 / 21 page Touch Screen Digitizer AD7843 Rev. B 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. Specifications subject to change without notice. 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 owners. 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 © 2004 Analog Devices, Inc. All rights reserved. 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-bit or 12-bit resolution 2 auxiliary analog inputs Shutdown mode: 1 µA max 16-lead QSOP and TSSOP packages APPLICATIONS Personal digital assistants Smart hand-held devices Touch screen monitors Point-of-sales terminals Pagers 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 package (QSOP) and a 16-lead thin shrink small outline package (TSSOP). FUNCTIONAL BLOCK DIAGRAM AD7843 +VCC +VCC PENIRQ SPORT DIN CS DOUT DCLK BUSY PEN INTERRUPT CHARGE REDISTRIBUTION DAC SAR + ADC CONTROL LOGIC 4-TO-1 I/P MUX T/H COMP GND X+ Y+ X– Y– IN3 IN4 VREF Figure 1. 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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