Data sheet for AD7877 touch screen controller, describing the features and characteristics of the product, including 4-wire touch screen interface, LCD noise reduction feature, automatic conversion sequencer and timer, etc.
The AD7877 is a 12‑bit successive‑approximation ADC designed for resistive touch‑screen interfaces. It provides a 4‑wire touch‑screen interface, on‑chip 8‑bit DAC, temperature sensor (‑40 °C to +85 °C), battery‑monitor channels and programmable conversion parameters. Throughput reaches 125 kSPS and the device can operate from a single 2.7 V to 5.25 V supply.
Available in 32‑lead LFCSP (5 mm × 5 mm) and 25‑ball WLCSP (2.5 mm × 2.8 mm) packages, the AD7877 is qualified for automotive applications and is used in PDAs, handheld devices, POS terminals, medical equipment and other portable electronics.
| Resolution | 12 Bits |
|---|---|
| Throughput Rate | 125 kSPS |
| Supply Voltage (Vcc) | 2.7 V to 5.25 V |
| Internal Reference Voltage | 2.5 V (typical 2.44‑2.55 V) |
| Temperature Range | ‑40 °C to +85 °C |
| Battery Monitor Input Range | 0.5 V to 5 V |
| DAC Resolution | 8 Bits |
| Package Options | 32‑lead LFCSP (5 mm × 5 mm) and 25‑ball WLCSP (2.5 mm × 2.8 mm) |
The AD7877 can achieve a throughput rate of 125 kSPS.
It operates from a single supply of 2.7 V to 5.25 V (functional operation down to 2.2 V).
Yes, it has an on‑chip temperature sensor covering –40 °C to +85 °C.
The device is offered in a 32‑lead LFCSP (5 mm × 5 mm) and a 25‑ball WLCSP (2.5 mm × 2.8 mm) package.