Overview
The ISO224ADWVR from Texas Instruments is a precision isolated amplifier designed for high-accuracy voltage sensing in industrial applications. This device features a ±12-V input voltage range and a ±4-V differential output voltage range, making it ideal for measuring ±10-V signals commonly used in industrial settings. The ISO224ADWVR operates with a single supply on the high-side, simplifying the design of isolated power supplies and reducing system costs. It also includes integrated high-side supply voltage detection, which simplifies system-level diagnostics. The device is certified for reinforced galvanic isolation up to 5 kV RMS, ensuring long lifetime and low power dissipation. It is fully specified over an extended industrial temperature range of –55°C to +125°C and is available in a wide-body 8-pin SOIC (DWV) package.
Key Specifications
| Parameter | Test Conditions | Min | Max | Unit | |
|---|---|---|---|---|---|
| Input Voltage Range | -12 | 12 | V | ||
| Output Voltage Range | -4 | 4 | V | ||
| Input Offset Voltage (ISO224B) | At TA = 25°C, IN = GND1 | -5 | ±1 | 5 | mV |
| Gain Error (ISO224B) | At TA = 25°C | -0.3% | ±0.05% | 0.3% | % |
| Nonlinearity (ISO224B) | At TA = 25°C | ±0.01% | % | ||
| High-Side Supply Voltage | 4.5 | 18 | V | ||
| Low-Side Supply Voltage | 4.5 | 5.5 | V | ||
| Common-Mode Transient Immunity (ISO224B) | |GND1 – GND2| = 1 kV | 55 | 80 | kV/µs | |
| Isolation Voltage | Reinforced Isolation per DIN VDE V 0884-11: 2017-01 | 7071 VPEAK | V | ||
| Isolation Voltage (RMS) | For 1 Minute per UL1577 | 5000 VRMS | V |
Key Features
- High Precision: Low DC-error operation with input offset of ±5 mV at 25°C, gain error of ±0.3%, and nonlinearity of ±0.01% for the ISO224B version.
- Reinforced Isolation: Certified for up to 5 kV RMS isolation with exceptionally long lifetime and low power dissipation.
- High CMTI: Common-Mode Transient Immunity of up to 80 kV/µs for the ISO224B version.
- Single-Supply Operation: Operates on a single supply on the high-side, simplifying isolated power supply design and reducing system costs.
- Integrated Supply Voltage Detection: Simplifies system-level diagnostics.
- Differential Output: ±4-V differential output supports high immunity to noise and allows the use of lower-cost analog-to-digital converters (ADCs).
- Extended Temperature Range: Fully specified over –55°C to +125°C.
Applications
- Grid Automation: Suitable for isolated analog signal acquisition in grid infrastructure applications.
- Protection Relays: Used in protection relay systems to ensure accurate and isolated voltage measurements.
- Factory Automation and Control: Ideal for industrial control systems requiring precise voltage sensing.
- Rail Transport: Applied in rail transport systems for reliable and isolated voltage measurements.
- Motor Drives: Used in motor drive applications to ensure accurate voltage sensing and control.
- Power Analyzers: Suitable for power analysis applications requiring high precision and isolation.
Q & A
- What is the input voltage range of the ISO224ADWVR?
The input voltage range of the ISO224ADWVR is ±12 V, optimized for isolated voltage measurement in industrial applications.
- What is the output voltage range of the ISO224ADWVR?
The output voltage range is ±4 V differential, with the common-mode at VDD2 / 2.
- What are the key specifications for the ISO224B version in terms of DC-error operation?
The ISO224B version has an input offset of ±5 mV at 25°C, gain error of ±0.3%, and nonlinearity of ±0.01%.
- What is the Common-Mode Transient Immunity (CMTI) of the ISO224B version?
The CMTI of the ISO224B version is up to 80 kV/µs.
- What is the isolation voltage rating of the ISO224ADWVR?
The ISO224ADWVR is certified for up to 5 kV RMS isolation and 7071 VPEAK reinforced isolation per DIN VDE V 0884-11: 2017-01.
- What is the operating temperature range of the ISO224ADWVR?
The device is fully specified over an extended industrial temperature range of –55°C to +125°C.
- What are the typical applications of the ISO224ADWVR?
The ISO224ADWVR is used in grid automation, protection relays, factory automation and control, rail transport, motor drives, and power analyzers.
- How does the ISO224ADWVR simplify system design?
The ISO224ADWVR simplifies system design by operating on a single supply on the high-side and including integrated high-side supply voltage detection, which reduces system costs and simplifies diagnostics.
- What is the package type of the ISO224ADWVR?
The ISO224ADWVR is available in a wide-body 8-pin SOIC (DWV) package.
- How does the differential output of the ISO224ADWVR support system design?
The ±4-V differential output supports high immunity to noise and allows the use of lower-cost analog-to-digital converters (ADCs).
