The ADS7843 is a 12-bit sampling Analog-to-Digital Converter (ADC) with a synchronous serial interface and low on-resistance switches for driving touch screens. Typical power dissipation is 750uW at a 125kHz throughput rate and a +2.7V supply. The reference voltage (VREF) can be varied between 1V and +VCC, providing a corresponding input voltage range of 0V to VREF. The device includes a shutdown mode which reduces typical power dissipation to under 0.5uW. The ADS7843 is specified down to 2.7V operation.
Low power, high speed, and onboard switches make the ADS7843 ideal for battery-operated systems such as personal digital assistants with resistive touch screens and other portable equipment. The ADS7843 is available in an SSOP-16 package and is specified over the –40°C to +85°C temperature range.
US Patent No. 6246394
| SAR ADC resolution (Bits) | 12 |
| SAR sample rate (max) (ksps) | 125 |
| Touch panel | 4-Wire |
| Control interface | SPI |
| Vref (int/ext) | Internal |
| Rating | Catalog |
| Operating temperature range (°C) | -40 to 85 |
| Analog supply (min) (V) | 2.7 |
| Analog supply voltage (max) (V) | 5.25 |
| Input type | Single-ended |
| SSOP (DBQ) | 16 | 29.4 mm² 4.9 x 6 |
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