The AD7843 is a 12-bit successive approximation ADC with a synchronous serial interface and low on resistance switches for driving touch screens. It operates from a single 2.2V to 5.25V power supply and features a throughput rate greater than 125kSPS.
The AD7843 is a 12‑bit successive‑approximation ADC with a synchronous serial interface, designed for resistive touch‑screen digitizers in portable devices such as PDAs and point‑of‑sale terminals. It operates from a single 2.2 V to 5.25 V supply, offers ratiometric conversion, and provides up to 125 kSPS throughput.
The document includes full specifications, timing diagrams, pin‑out descriptions, absolute maximum ratings, and layout recommendations. It also covers the PENIRQ interrupt function, typical performance curves, and ordering information for QSOP and TSSOP packages.
| Resolution | 12 Bits |
|---|---|
| Throughput Rate | 125 kSPS max |
| Supply Voltage | 2.2 V to 5.25 V |
| Power Consumption (125 kSPS) | 1.37 mW max at Vcc = 3.6 V |
The AD7843 can operate up to 125 kSPS maximum throughput.
It works from a single supply of 2.2 V to 5.25 V.
The AD7843 provides a 12‑bit resolution.