1b22 is an isolated voltage-to-current converter produced by analog devices company. It has the characteristics of high accuracy, high isolation and small size.
The 1B22 provides an isolated 4‑20 mA or 0‑20 mA output proportional to the input voltage. It features pin‑programmable input ranges of 0 V‑5 V or 0 V‑10 V, high common‑mode voltage isolation of 1500 V rms, and a small 1.0" × 2.1" × 0.35" package suitable for multichannel process‑control systems.
Designed for industrial environments, the device operates from –25 °C to +85 °C, includes an internal loop supply, and meets IEEE STD 472 for CMV transient protection. The datasheet details specifications, functional block diagrams, and application examples such as isolated D/A conversion and pressure‑transmitter interfaces.
| Input voltage range | 0 V‑5 V or 0 V‑10 V (pin programmable) |
|---|---|
| Output current range | 0 mA‑20 mA or 4 mA‑20 mA (pin programmable) |
| Common‑mode voltage isolation | 1500 V rms (continuous) |
| Common‑mode rejection | 90 dB min |
| Operating temperature range | –25 °C to +85 °C |
| Package size | 1.0" × 2.1" × 0.35" |
| Quiescent current | 7.5 mA |
The device provides up to 1500 V rms continuous CMV isolation.
The input range can be programmed to either 0 V‑5 V or 0 V‑10 V.
The output can be set to 0‑20 mA or 4‑20 mA depending on the pin configuration.
It operates from –25 °C up to +85 °C (industrial grade).