Overview
The AD421BNZ, produced by Analog Devices Inc., is a loop-powered, digital to 4 mA to 20 mA converter designed specifically for smart industrial control transmitters. This component offers a high-performance, low-cost solution for generating precise current signals, making it ideal for applications in the industrial control industry. The AD421 integrates multiple functions, including a DAC for converting digital data to analog format, a current amplifier, and a voltage regulator to provide a stable operating voltage from the loop supply.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Current Output Range | 4 | - | 20 | mA |
| Resolution | - | 16-bit | - | - |
| Integral Nonlinearity | -0.01% | - | 0.01% | % |
| Zero Scale Offset Error | -0.1% | - | 0.1% | % |
| Full-Scale Gain Error | -0.2% | - | 0.2% | % |
| Regulated Supply Voltage | 3 V / 3.3 V / 5 V | - | - | V |
| Precision Reference Voltage | 1.25 V / 2.5 V | - | - | V |
| Quiescent Current | - | - | 750 μA | μA |
| Operating Temperature Range | -40°C | - | 85°C | °C |
| Package Type | - | 16-lead SOIC and PDIP | - | - |
Key Features
- HART® compatible and supports other similar FSK protocols.
- Programmable alarm current capability to indicate transducer faults.
- High-speed serial interface capable of operating at 10 Mbps.
- Selectable regulator output voltage: +3 V, +3.3 V, or +5 V.
- Precision reference voltages: +1.25 V and +2.5 V.
- Low quiescent current of up to 750 μA.
- Compact 16-lead package (SOIC and PDIP).
- Full-scale settling time typically within 8 ms.
Applications
The AD421BNZ is primarily used in smart industrial control transmitters, where precise current signals are required. It is suitable for various industrial control applications, including:
- Process control systems.
- Industrial automation.
- Smart transmitters.
- Field instruments.
Q & A
- What is the primary function of the AD421BNZ?
The AD421BNZ is a loop-powered, digital to 4 mA to 20 mA converter designed for smart industrial control transmitters.
- What is the resolution of the AD421BNZ?
The AD421BNZ has a 16-bit resolution.
- What are the available precision reference voltages?
The AD421BNZ provides precision reference voltages of +1.25 V and +2.5 V.
- Is the AD421BNZ compatible with HART protocols?
Yes, the AD421BNZ is fully compatible with standard HART circuitry and other similar FSK protocols.
- What is the quiescent current of the AD421BNZ?
The quiescent current of the AD421BNZ is up to 750 μA.
- What are the available package types for the AD421BNZ?
The AD421BNZ is available in 16-lead SOIC and PDIP packages.
- What is the operating temperature range of the AD421BNZ?
The operating temperature range is from -40°C to +85°C.
- Can the AD421BNZ be used with other microprocessors and microcontrollers?
Yes, the AD421BNZ has a high-speed serial interface capable of operating at 10 Mbps, allowing simple connection to commonly-used microprocessors and microcontrollers.
- Does the AD421BNZ have programmable alarm current capability?
Yes, the AD421BNZ features a programmable alarm current capability to indicate transducer faults.
- What is the full-scale settling time of the AD421BNZ?
The full-scale settling time typically occurs within 8 ms.
