The AD7898 is a 5V, 12-bit, serial 220kSPS ADC. It features a high-speed, flexible serial interface that allows interfacing with 3V processors. It offers two modes of operation and selectable input ranges. The ADC has high input impedance and low power consumption.
The AD7898 is a fast 12‑bit analog‑to‑digital converter that operates from a single 5 V supply and is housed in a compact 8‑lead SOIC package. It includes an on‑chip track/hold amplifier, internal clock, and a high‑speed serial interface that can connect to 3 V or 5 V processors.
Key features include a 220 kSPS throughput rate, selectable input ranges (+10 V for AD7898‑10, +2.5 V for AD7898‑3), low power consumption (22.5 mW max), power‑down mode for portable applications, and two serial interface modes (Mode 0 and Mode 1). The device offers high‑speed conversion with 3.3 µs conversion time in Mode 0 and up to 4.33 µs in Mode 1.
| Resolution | 12 bits |
|---|---|
| Power Dissipation | 22.5 mW max |
| Input Voltage Range | +10 V (AD7898‑10) / +2.5 V (AD7898‑3) |
| Conversion Rate (Mode 0) | 220 KSPS max |
| Conversion Rate (Mode 1) | 220 KSPS max |
| Supply Voltage (Vpp) | 4.75 V to 5.25 V |
The AD7898 can sample at up to 220 kSPS in both Mode 0 and Mode 1.
It operates from a single 5 V supply with Vpp specified between 4.75 V and 5.25 V.
The AD7898‑10 version accepts up to +10 V, while the AD7898‑3 version accepts up to +2.5 V.
Yes, the device offers a proprietary power‑down capability when operated in Mode 1.