This datasheet describes the AD421, a loop-powered 4 mA to 20 mA digital-to-analog converter featuring 16-bit resolution and monotonicity for industrial…
The AD421 is a complete loop-powered 4 mA-20 mA digital-to-analog converter (DAC) designed specifically for intelligent transmitters in the industrial control field. It offers a compact 16-pin package with 16-bit resolution, monotonicity, and an integral nonlinearity of ±0.01%. The device integrates an optional regulator and precision voltage references to power itself and other transmitter circuitry without external components. This manual is written in Chinese.
| Current Output Range | 4 mA to 20 mA |
|---|---|
| Resolution | 16-bit |
| Integral Nonlinearity | ±0.01% |
| Regulator Output Voltages | +5 V, +3.3 V or +3 V |
| Reference Voltage Sources | +1.25 V and +2.5 V |
| Operating Temperature Range | -40°C to +85°C |
| Package Options | 16-pin SOIC and PDIP |
It is designed specifically to meet the needs of smart transmitter manufacturers in the industrial control field.
No, it does not need external independent regulators and voltage reference sources as they are built-in.
Yes, it can be used in combination with standard HART FSK protocol communication circuits.