The AD7890 is an 8-channel 12-bit data acquisition system with a fast 12-bit ADC and a 5.9 μs conversion time. It supports multiple input ranges, including ±10 V, 0 V to 4.096 V, and 0 V to 2.5 V. It is also single-supply and low-power (maximum 50 mW).
The AD7890 integrates an 8‑channel input multiplexer, a 12‑bit analog‑to‑digital converter, an on‑chip track/hold amplifier, a 2.5 V reference and a high‑speed serial interface on a single LC2MOS chip. It operates from a single 5 V supply and offers selectable input ranges of ±10 V, 0‑4.096 V or 0‑2.5 V.
The datasheet provides detailed specifications, pin configurations, timing diagrams, power consumption figures and interface guidelines for connecting the device to microcontrollers, DSPs or other digital systems. It also includes performance data such as dynamic range, harmonic distortion and effective number of bits.
| Standby‑mode power consumption | 75 µW typ |
|---|---|
| Input voltage range (AD7890‑10) | ±10 V |
| Input voltage range (AD7890‑4) | 0 V to 4.096 V |
| Input voltage range (AD7890‑2) | 0 V to 2.5 V |
It provides eight single‑ended analog input channels.
The AD7890 supports ±10 V (AD7890‑10), 0‑4.096 V (AD7890‑4) and 0‑2.5 V (AD7890‑2) ranges.