Overview
The AD5421BREZ-REEL, produced by Analog Devices Inc., is a complete, loop-powered, 4 mA to 20 mA digital-to-analog converter (DAC) designed to meet the needs of smart transmitter manufacturers in the industrial control industry. This DAC provides a high precision, fully integrated, and cost-effective solution in compact TSSOP and LFCSP packages. It is tailored for applications requiring precise current output in industrial process control and smart transmitter systems.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Resolution | - | - | 16 Bits | - | - |
| Total Unadjusted Error (TUE) | -0.126% | - | +0.126% | FSR | C grade, TMIN to TMAX |
| Relative Accuracy (INL) | -0.004% | - | +0.004% | FSR | C grade, TA = 25°C |
| Output Temperature Coefficient | - | 3 ppm/°C | - | - | Typical |
| Quiescent Current | - | - | 300 μA | - | Maximum |
| Loop Voltage Range | 5.5 V | - | 52 V | - | - |
| Temperature Range | -40°C | - | +105°C | - | - |
Key Features
- Pin selectable NAMUR-compliant ranges: 4 mA to 20 mA, 3.8 mA to 21 mA, and 3.2 mA to 24 mA
- NAMUR-compliant alarm currents: downscale alarm current = 3.2 mA, upscale alarm current = 22.8 mA/24 mA
- Flexible SPI-compatible serial digital interface with Schmitt triggered inputs
- On-chip fault alerts via FAULT pin or alarm current
- Automatic readback of fault register on each write cycle
- Slew rate control function and gain and offset adjust registers
- On-chip reference with a temperature coefficient of 4 ppm/°C maximum
Applications
- Industrial process control
- 4 mA to 20 mA loop-powered transmitters
- Smart transmitters
- HART network connectivity
Q & A
- What is the primary function of the AD5421BREZ-REEL?
The AD5421BREZ-REEL is a loop-powered, 4 mA to 20 mA digital-to-analog converter (DAC) designed for industrial process control and smart transmitter applications. - What are the NAMUR-compliant ranges supported by the AD5421BREZ-REEL?
The device supports NAMUR-compliant ranges of 4 mA to 20 mA, 3.8 mA to 21 mA, and 3.2 mA to 24 mA. - What is the total unadjusted error (TUE) of the AD5421BREZ-REEL?
The total unadjusted error (TUE) is ±0.126% FSR for the C grade over the full temperature range. - What is the quiescent current of the AD5421BREZ-REEL?
The quiescent current is 300 μA maximum. - What is the temperature range of the AD5421BREZ-REEL?
The device operates over a temperature range of -40°C to +105°C. - What types of alarm currents does the AD5421BREZ-REEL support?
The device supports NAMUR-compliant alarm currents: downscale alarm current = 3.2 mA, upscale alarm current = 22.8 mA/24 mA. - Does the AD5421BREZ-REEL have on-chip fault detection?
Yes, it has on-chip fault alerts via the FAULT pin or alarm current. - What interface does the AD5421BREZ-REEL use for communication?
The device uses a flexible SPI-compatible serial digital interface with Schmitt triggered inputs. - Can the AD5421BREZ-REEL be used in HART network applications?
Yes, it is suitable for HART network connectivity. - What are the package options for the AD5421BREZ-REEL?
The device is available in TSSOP and LFCSP packages.
