The AD7873 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 2.2 V to 5.25 V power supply and features a specified throughput rate of 125 kSPS. The AD7873 has a 4-wire touch screen interface, an on-chip temperature sensor, and a 2.5 V reference voltage. It also supports direct battery measurement (0 V to 6 V) and touch pressure measurement. The device offers programmable 8-bit or 12-bit resolution, one auxiliary analog input, and a shutdown mode with a maximum current consumption of 1 μA. It can be widely used in personal digital assistants, smart handheld devices, touch screen monitors, point-of-sale terminals, pagers, and other applications.
The AD7873 is a 12‑bit successive‑approximation ADC designed for resistive touch‑screen interfaces. It operates from a single 2.2 V to 5.25 V supply and includes an on‑chip 2.5 V reference, temperature sensor (‑40 °C to +85 °C), battery‑monitor input and touch‑pressure measurement.
The device offers a maximum throughput of 125 kSPS, programmable 8‑ or 12‑bit resolution, and a shutdown mode with sub‑µA current draw. It is available in 16‑lead QSOP, TSSOP and LFCSP packages and provides a serial interface for data transfer.
| Supply Voltage (Vcc) | 2.2 V to 5.25 V |
|---|---|
| On‑chip Reference Voltage | 2.5 V |
It operates from a single supply of 2.2 V to 5.25 V.
The device provides an internal 2.5 V reference.