Overview
The AD5421ACPZ-REEL7, 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 low-cost solution in compact TSSOP and LFCSP packages. It includes a regulated voltage output to power itself and other devices in the transmitter, along with on-chip references, eliminating the need for discrete regulators and voltage references. The AD5421 is compatible with standard Highway Addressable Remote Transducer (HART®) FSK protocol communication circuitry without any degradation in specified performance.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Total Unadjusted Error (TUE) | - | - | 0.05% | - | - |
| Integral Nonlinearity (INL) | - | - | 0.0035% FSR | - | - |
| Output Temperature Coefficient (TC) | - | 3 ppm/°C | - | - | - |
| Quiescent Current | 260 μA | 300 μA | - | - | Temperature range: −40°C to +105°C; typical at +25°C |
| Loop Voltage Range | 5.5 V | - | 52 V | - | - |
| Temperature Range | −40°C | - | +105°C | - | - |
| Output Voltage Regulator | 1.8 V | - | 12 V | - | - |
| Serial Interface Speed | - | - | 30 MHz | - | - |
Key Features
- Fully integrated, loop-powered 4 mA to 20 mA DAC with high precision and low cost.
- 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.
- Selectable regulated voltage output from 1.8 V to 12 V.
- Compatibility with HART FSK protocol communication circuitry.
- Guaranteed monotonic to 16 bits with low integral nonlinearity, offset error, and gain error.
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 AD5421ACPZ-REEL7?
The AD5421ACPZ-REEL7 is a loop-powered, 4 mA to 20 mA digital-to-analog converter (DAC) designed for industrial process control and smart transmitter applications.
- What is the temperature range of the AD5421ACPZ-REEL7?
The temperature range is from −40°C to +105°C.
- What is the output voltage range of the on-chip voltage regulator?
The output voltage range is from 1.8 V to 12 V.
- Is the AD5421ACPZ-REEL7 compatible with HART protocol?
Yes, it is compatible with standard Highway Addressable Remote Transducer (HART®) FSK protocol communication circuitry.
- What is the maximum speed of the serial interface?
The serial interface can operate at up to 30 MHz.
- What are the package options for the AD5421ACPZ-REEL7?
The device is available in 28-lead TSSOP and 32-lead LFCSP packages.
- What is the quiescent current of the AD5421ACPZ-REEL7?
The quiescent current is 260 μA to 300 μA.
- Does the AD5421ACPZ-REEL7 have fault detection capabilities?
Yes, it includes on-chip fault alerts via the FAULT pin or alarm current.
- Can the AD5421ACPZ-REEL7 be used with microprocessors and microcontrollers?
Yes, it has a SPI-compatible, 3-wire interface for simple connection to commonly used microprocessors and microcontrollers.
- What is the integral nonlinearity (INL) of the AD5421ACPZ-REEL7?
The integral nonlinearity is 0.0035% FSR maximum.
