Overview
The 1B21AN, produced by Analog Devices Inc., is an isolated voltage-to-current converter designed for industrial applications. It incorporates a unique circuit design utilizing transformer-based isolation and automated surface-mount manufacturing technology. This converter provides a high level of versatility and performance in a compact plastic package, making it suitable for harsh environments with high common-mode interference. The 1B21AN consists of four basic sections: input conditioning, modulator, demodulator, and current source, ensuring complete input to output galvanic isolation of 1500 V rms continuous.
Key Specifications
| Specification | Value |
|---|---|
| Input Voltage Range | 0 V to 1 V up to 0 V to 10 V |
| Output Current Range | 0 mA to 20 mA, 4 mA to 20 mA with offset |
| Common Mode Voltage (CMV) Isolation | 1500 V rms continuous |
| Load Resistance Range | 0 to 1.35 kΩ maximum |
| Temperature Range | −25°C to +85°C (specified), −40°C to +85°C (operational) |
| Nonlinearity | ±0.05% maximum |
| Gain Temperature Coefficient | ±50 ppm/°C |
| Offset Temperature Coefficient | ±300 nA/°C |
| Package Size | 0.7” × 2.1” × 0.35” (DIP-8) |
| Loop Supply Compliance | Up to 27 V, maximum loop supply 30 V |
Key Features
- High CMV isolation: 1500 V rms continuous, meeting IEEE Standard 472 for transient voltage protection.
- Programmable output ranges: 0 mA to 20 mA and 4 mA to 20 mA with internal reference offset.
- Low nonlinearity: ±0.05% maximum.
- High accuracy with low gain and offset temperature coefficients.
- Compact package size: 0.7” × 2.1” × 0.35” (DIP-8), suitable for multichannel systems.
- No external buffers or drivers required for isolated voltage-to-current conversion.
Applications
- Multichannel process control and DAC-current loop interfaces.
- Analog transmitters and controllers.
- Remote data acquisition systems.
Q & A
- What is the primary function of the 1B21AN? The 1B21AN is an isolated voltage-to-current converter designed to convert analog voltage inputs into proportional current outputs.
- What is the input voltage range of the 1B21AN? The input voltage range can be from 0 V to 1 V up to 0 V to 10 V.
- What is the output current range of the 1B21AN? The output current range is from 0 mA to 20 mA, and it can be offset to 4 mA to 20 mA using the internal reference.
- What level of common-mode voltage (CMV) isolation does the 1B21AN provide? The 1B21AN provides 1500 V rms continuous CMV isolation.
- What is the temperature range for the 1B21AN? The specified temperature range is −25°C to +85°C, and the operational range is −40°C to +85°C.
- What is the nonlinearity of the 1B21AN? The nonlinearity is ±0.05% maximum.
- Does the 1B21AN require any external components for operation? No external buffers or drivers are required for isolated voltage-to-current conversion, but an external loop supply is necessary.
- What are some common applications of the 1B21AN? Common applications include multichannel process control, analog transmitters and controllers, and remote data acquisition systems.
- What is the package size of the 1B21AN? The package size is 0.7” × 2.1” × 0.35” (DIP-8).
- What is the maximum load resistance the 1B21AN can handle? The maximum load resistance is 1.35 kΩ.
