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AD7873ACP 데이터시트(PDF) 1 Page - Analog Devices |
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AD7873ACP 데이터시트(HTML) 1 Page - Analog Devices |
1 / 28 page Touch Screen Digitizer AD7873 Rev. D 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 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 max 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 power supply and features throughput rates greater than 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 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 AD7873 features on-board switches. This, coupled with low power and high speed operation, makes the 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), a 16-lead thin shrink small outline package (TSSOP), and a 16-lead lead frame chip scale package (LFCSP). FUNCTIONAL BLOCK DIAGRAM AD7873 +VCC +VCC PENIRQ SPORT DIN CS DOUT DCLK BUSY 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 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 max with the reference off, or 2.41 mW typ 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. |
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