Ratiometric conversion mode available, eliminating errors due to on-board switch resistances. On-board temperature sensor: −40°C to +85°C. Battery monitor input. Touch pressure measurement capability. 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. Package options include 4 mm × 4 mm LFCSP. Analog input range from 0 V to VREF. Versatile serial I/O ports.
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
Applications
Features and Benefits
| Analog to Digital Converters |
| Document | note |
| AD7873: Touch Screen Digitizer Data Sheet (Rev. F) | PDF 579 kB |
| Document | note |
| AN-577: Layout and Grounding Recommendations for Touch Screen Digitizers (Rev. 0) | PDF 52 kB |
| Document | note |
| UG-062: Evaluation Board for AD7843/AD7873 Resistive Touch Screen Controllers | PDF 334 kB |
| Part Number | Package | Packing Qty | Temp Range | Price 100-499 | Price 1000+ | RoHS |
|---|---|---|---|---|---|---|
| AD7873ACPZ Production | 16 ld LFCSP (4x4x.85mm, 2.10mm exposed pad) | OTH 490 | -40 to 85C | 2.1 | 1.95 | Y |
| AD7873ARQZ Production | 16 ld QSOP | OTH 98 | -40 to 85C | 2.1 | 1.95 | Y |
| AD7873ARQZ-REEL Production | 16 ld QSOP | REEL 2500 | -40 to 85C | 2.1 | 1.95 | Y |
| AD7873ARQZ-REEL7 Production | 16 ld QSOP | REEL 1000 | -40 to 85C | 2.1 | 1.95 | Y |
| AD7873ARUZ Production | 16 ld TSSOP | OTH 96 | -40 to 85C | 2.1 | 1.95 | Y |
| AD7873ARUZ-REEL Production | 16 ld TSSOP | REEL 2500 | -40 to 85C | 2.1 | 1.95 | Y |
| AD7873ARUZ-REEL7 Production | 16 ld TSSOP | REEL 1000 | -40 to 85C | 2.1 | 1.95 | Y |
| AD7873BRQZ Last Time Buy | 16 ld QSOP | OTH 98 | -40 to 85C | 2.1 | 1.95 | Y |
| AD7873BRQZ-REEL7 Last Time Buy | 16 ld QSOP | REEL 1000 | -40 to 85C | 0 | 1.95 | Y |
