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AD7873ARQZ Fiches technique(PDF) 1 Page - Analog Devices |
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AD7873ARQZ Fiches technique(HTML) 1 Page - Analog Devices |
1 / 29 page Touch Screen Digitizer Data Sheet AD7873 Rev. F Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2013 Analog Devices, Inc. All rights reserved. FEATURES 4-wire touch screen interface On-chip temperature sensor: −40°C to +85°C On-chip 2.5 V reference Direct battery measurement (0 V to 6 V) Touch pressure measurement Specified throughput rate of 125 kSPS Single supply, VCC of 2.2 V to 5.25 V Ratiometric conversion High speed serial interface Programmable 8-bit or 12-bit resolution One auxiliary analog input Shutdown mode: 1 µA maximum 16-lead QSOP, TSSOP, and LFCSP packages APPLICATIONS Personal digital assistants Smart hand-held devices Touch screen monitors Point-of-sale terminals Pagers GENERAL DESCRIPTION The AD7873 is a 12-bit successive approximation ADC with a synchronous serial interface and low on resistance switches for driving touch screens. The AD7873 operates from a single 2.2 V to 5.25 V supply, with a throughput rate of 125 kSPS. The AD7873 features direct battery measurement, temperature measurement, and touch pressure measurement. The AD7873 also has an on-board reference of 2.5 V that can be used for the auxiliary input, battery monitor, and temperature measurement modes. When not in use, the internal reference can be shut down to conserve power. An external reference can also be applied and varied from 1 V to VCC with an analog input range from 0 V to VREF. The device includes a shutdown mode that reduces the current consumption to less than 1 µA. The AD7873 features on-board switches. This, coupled with low power and high speed operation, makes the device ideal for battery-powered systems with resistive touch screens. The part is available in a 16-lead, 0.15 inch quarter size outline package (QSOP), a 16-lead, thin shrink small outline package (TSSOP), and a 16-lead, lead frame chip scale package (LFCSP). FUNCTIONAL BLOCK DIAGRAM Figure 1. PRODUCT HIGHLIGHTS 1. Ratiometric conversion mode available, eliminating errors due to on-board switch resistances. 2. On-board temperature sensor: −40°C to +85°C. 3. Battery monitor input. 4. Touch pressure measurement capability. 5. Low power consumption of 1.37 mW maximum with the reference off, or 2.41 mW typical with the reference on, at 125 kSPS and VCC at 3.6 V. 6. Package options include 4 mm × 4 mm LFCSP. 7. Analog input range from 0 V to VREF. 8. Versatile serial I/O ports. AD7873 +VCC +VCC PENIRQ SPORT DIN DOUT DCLK BUSY CS PEN INTERRUPT CHARGE REDISTRIBUTION DAC SAR + ADC CONTROL LOGIC 6-TO-1 I/P MUX T/H COMP GND TEMP SENSOR BATTERY MONITOR Y+ Y– AUX 2.5V REF X+ X– VREF VBAT BUF |
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