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AD7873:  Touch Screen Digitizer

Product Details


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).

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.
Applications

  • Personal digital assistants
  • Smart hand-held devices
  • Touch screen monitors
  • Point-of-sale terminals
  • Pagers

FEATURES and BENEFITS

  • 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- or 12-bit resolution
  • One auxiliary analog input
  • Shutdown mode: 1 µA maximum
  • 16-lead QSOP, TSSOP, and LFCSP packages

Functional Block Diagram for AD7873

Of Note ...

Also see the AD7843, which is a sister part to the AD7873.

Documentation

Title Content Type File Type
AD7873: Touch Screen Digitizer Data Sheet (Rev F, 02/2013) (pdf, 579 kB) Data Sheets PDF
AN-577: Layout and Grounding Recommendations for Touch Screen Digitizers  (pdf, 52 kB) Application Notes PDF
UG-062: Evaluation Board for AD7843/AD7873 Resistive Touch Screen Controllers  (pdf, 334 kB) User Guides PDF
The PDA Challenge—Met by the AD7873 Resistive-Touch-Screen Controller ADC
(Analog Dialogue, Vol. 35, No. 4, August-September, 2001)
Analog Dialogue HTML
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
ICs for Enhanced Handset User Experience Overview HTML
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD7873 Input Touch Screen Digitizer Linux Driver Device Drivers HTML

Evaluation Kits & Symbols & Footprints

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

SampleSample & Buy

Price, packaging, availability

AD7873 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7873ACPZ Status: Production 16 ld LFCSP (4x4x.85mm, 2.10mm exposed pad) 16 Ind Tray, 490 $2.10 $1.95 Y  Material Info PCN Purchase
AD7873ACPZ-REEL Status: Last Time Buy 16 ld LFCSP (4x4x.85mm, 2.10mm exposed pad) 16 Ind Reel, 5000 $2.10 $1.95 Y  Material Info PCN/PDN Purchase
AD7873ACPZ-REEL7 Status: Last Time Buy 16 ld LFCSP (4x4x.85mm, 2.10mm exposed pad) 16 Ind Reel, 1500 $2.10 $1.95 Y  Material Info PCN/PDN Purchase
AD7873ARQZ Status: Production 16 ld QSOP 16 Ind Tube, 98 $2.10 $1.95 Y  Material Info PCN Purchase Sample
AD7873ARQZ-REEL Status: Production 16 ld QSOP 16 Ind Reel, 2500 $2.10 $1.95 Y  Material Info PCN Purchase
AD7873ARQZ-REEL7 Status: Production 16 ld QSOP 16 Ind Reel, 1000 $2.10 $1.95 Y  Material Info PCN Purchase
AD7873ARUZ Status: Production 16 ld TSSOP 16 Ind Tube, 96 $2.10 $1.95 Y  Material Info PCN Purchase Sample
AD7873ARUZ-REEL Status: Production 16 ld TSSOP 16 Ind Reel, 2500 $2.10 $1.95 Y  Material Info PCN Purchase
AD7873ARUZ-REEL7 Status: Production 16 ld TSSOP 16 Ind Reel, 1000 $2.10 $1.95 Y  Material Info PCN Purchase
AD7873BRQZ Status: Production 16 ld QSOP 16 Ind Tube, 98 $2.10 $1.95 Y  Material Info PCN Purchase
AD7873BRQZ-REEL Status: Last Time Buy 16 ld QSOP 16 Ind Reel, 2500 - $1.95 Y  Material Info PCN/PDN Purchase
AD7873BRQZ-REEL7 Status: Production 16 ld QSOP 16 Ind Reel, 1000 - $1.95 Y  Material Info PCN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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