AD7894 is a fast 14-bit ADC that operates from a single +5V supply and is housed in a small 8-lead SOIC package. The device features a 5µs successive approximation A/D converter, an on-chip track/hold amplifier, an on-chip clock, and a high-speed serial interface. Output data from the AD7894 is provided via a high-speed serial interface port. The product has high input impedance, low power consumption, and is a pin-compatible upgrade of the 12-bit AD7895.
The AD7894 is a 14‑bit successive‑approximation ADC offered in three versions (‑10 V, ‑2.5 V, 0‑2.5 V input ranges). It operates from a single +5 V supply, consumes only about 20 mW, and provides a two‑wire serial interface for data and clock.
The datasheet lists detailed electrical specifications, timing characteristics, pin functions and ordering information. It also defines performance parameters such as SNR, THD, conversion time and power‑down mode behavior.
| Resolution | 14 bits |
|---|---|
| Conversion Time (Mode 1) | 5 ms max |
| Typical Power Consumption | 20 mW |
| Input Voltage Range (AD7894‑10) | –10 V |
| Input Voltage Range (AD7894‑3) | –2.5 V |
| Serial Clock Maximum Frequency | 16 MHz |
Mode 1 conversion time is 5 ms max, while Mode 2 (auto‑sleep) takes up to 10 ms.
The device typically consumes about 20 mW, with a maximum dissipation of 27.5 mW.
AD7894‑10 accepts –10 V, AD7894‑3 accepts –2.5 V, and AD7894‑2 accepts 0 V to +2.5 V.