Overview
The ISO224ADWV from Texas Instruments is a precision isolated amplifier designed for high-accuracy voltage sensing in industrial applications. This device features an output separated from the input circuitry by a reinforced isolation barrier, providing high immunity to magnetic interference and ensuring the protection of lower-voltage devices from damage. The ISO224 is available in both High-Grade (ISO224B) and Low-Grade (ISO224A) versions, each optimized for different performance requirements.
The amplifier operates on a single supply on the high-side, ranging from 4.5 V to 18 V, and on the low-side from 4.5 V to 5.5 V. It is fully specified over an extended industrial temperature range of –55°C to +125°C and is packaged in a wide-body 8-pin SOIC (DWV) package.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage Range | -12 | 12 | V | |
| Input Offset Voltage (ISO224B) | -5 | 5 | mV | |
| Gain Error (ISO224B) | -0.3% | 0.3% | ||
| Nonlinearity (ISO224B) | -0.01% | 0.01% | ||
| Output Voltage Range | -4 | 4 | V | |
| High-Side Supply Voltage | 4.5 | 18 | V | |
| Low-Side Supply Voltage | 4.5 | 5.5 | V | |
| Isolation Voltage (RMS) | 5000 | V | ||
| Common-Mode Transient Immunity (ISO224B) | 80 | kV/µs | ||
| Operating Temperature Range | -55 | 125 | °C |
Key Features
- Reinforced Isolation Barrier: Provides up to 5 kV RMS isolation with high immunity to magnetic interference and long lifetime.
- Single-Supply Operation: Operates on a single supply on the high-side (4.5 V to 18 V) and low-side (4.5 V to 5.5 V).
- High Accuracy: Low DC-error operation with input offset, gain error, and nonlinearity specifications optimized for precision voltage sensing.
- Overvoltage Input Clamp: Features a 9-kV ESD protection.
- Differential Output: ±4-V differential output range with common-mode at VDD2 / 2, supporting high immunity to noise.
- Integrated Diagnostics: High-side supply voltage detection simplifies system-level diagnostics.
- Extended Temperature Range: Fully specified over –55°C to +125°C.
- Package: Available in a wide-body 8-pin SOIC (DWV) package.
Applications
- Grid Automation: Used in grid automation systems for accurate voltage measurement and isolation.
- Protection Relays: Employed in protection relays to ensure reliable and isolated signal transmission.
- Factory Automation and Control: Utilized in factory automation for precise voltage sensing and isolation.
- Rail Transport: Applied in rail transport systems for reliable and isolated signal acquisition.
- Motor Drives: Used in motor drive systems to ensure accurate and isolated voltage measurement.
- Power Analyzers: Incorporated in power analyzers for precise and isolated voltage sensing.
Q & A
- What is the input voltage range of the ISO224?
The input voltage range of the ISO224 is ±12 V, optimized for isolated voltage measurement in industrial applications.
- What are the supply voltage ranges for the ISO224?
The ISO224 operates on a single supply on the high-side from 4.5 V to 18 V and on the low-side from 4.5 V to 5.5 V.
- What is the output voltage range of the ISO224?
The output voltage range of the ISO224 is ±4 V differential, with the common-mode at VDD2 / 2.
- What are the key certifications for the ISO224's isolation barrier?
The ISO224's isolation barrier is certified for 7071-V peak reinforced isolation per DIN VDE V 0884-11: 2017-01 and 5000-V RMS isolation for 1 minute per UL1577.
- What is the common-mode transient immunity (CMTI) of the ISO224B?
The CMTI of the ISO224B is typically 80 kV/µs.
- What is the operating temperature range of the ISO224?
The ISO224 is fully specified over an extended industrial temperature range of –55°C to +125°C.
- What package is the ISO224 available in?
The ISO224 is available in a wide-body 8-pin SOIC (DWV) package.
- What are some of the key applications of the ISO224?
The ISO224 is used in grid automation, protection relays, factory automation and control, rail transport, motor drives, and power analyzers.
- Does the ISO224 have any integrated diagnostic features?
Yes, the ISO224 features integrated high-side supply voltage detection, which simplifies system-level diagnostics.
- How does the ISO224 protect lower-voltage devices?
The ISO224 protects lower-voltage devices by separating parts of the system that operate on different common-mode voltage levels using its reinforced isolation barrier.
