Key facts
- Brand
- Analog Devices
- Model
- AD421
- Industry
- Industrial
- Documents
- 3
- Languages
- EN · ZH
- Last added
- 2012-06-08
Start here
Analog Devices AD421 Loop-Powered DAC Datasheet
The AD421 is a complete, loop-powered digital-to-current converter designed for smart transmitter manufacturers in the industrial control industry. It provides a high precision, fully integrated solution that eliminates the need for discrete regulators and voltage references by including an on-chip selectable regulator (3 V, 3.3 V, or 5 V) and precision references (+1.25 V or +2.5 V).
The device features a sigma-delta architecture ensuring 16-bit monotonicity with an integral nonlinearity of +0.01%. It supports standard HART FSK protocol communication via a high-speed serial interface capable of operating at up to 10 Mbps. The AD421 is available in 16-lead plastic DIP and SOIC packages, specified for the industrial temperature range of -40°C to +85°C.
Analog Devices AD421 specifications
| Current Output Range | 4 mA to 20 mA |
|---|---|
| Resolution | 16 Bits |
| Integral Nonlinearity | +0.01 % of FS max |
| Full-Scale Settling Time | 8 ms typ |
| Data Rate | 10 Mbps max |
All Analog Devices AD421 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
Is the AD421 compatible with HART?
Yes, it is fully compatible with standard HART FSK protocol communication circuitry.
What are the available regulator output voltages?
The device provides selectable regulated outputs of +5 V, +3.3 V, or +3 V.
What is the normal output current range of the AD421?
The AD421 provides a normal output current range of 4 mA to 20 mA.
What is the maximum loop voltage the AD421 can handle?
The device can tolerate up to 350 V loop voltage, limited by the breakdown voltage of the external pass transistor.
What is the primary application for the AD421?
It is designed specifically to meet the needs of smart transmitter manufacturers in the industrial control field.
From: Analog Devices AD421 Loop-Powered 4 mA-20 mA DAC Datasheet
Does the AD421 require external regulators or voltage references?
No, it does not need external independent regulators and voltage reference sources as they are built-in.
From: Analog Devices AD421 Loop-Powered 4 mA-20 mA DAC Datasheet