Overview
The ISO224BDWVR, produced by Texas Instruments, is a precision isolated amplifier designed for high-accuracy voltage measurement in industrial applications. This device features a reinforced isolation barrier that separates the input and output circuitry, 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.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage Range | -12 | 12 | V | |
| Input Offset Voltage (ISO224B) | -5 | ±1 | 5 | mV |
| Gain Error (ISO224B) | -0.3% | 0.3% | ||
| Nonlinearity (ISO224B) | -0.01% | 0.01% | ||
| High-Side Supply Voltage | 4.5 | 18 | V | |
| Low-Side Supply Voltage | 4.5 | 5.5 | V | |
| Differential Output Voltage Range | -4 | 4 | V | |
| Common-Mode Output Voltage | VDD2 / 2 | V | ||
| Operating Temperature Range | -55 | 125 | °C | |
| Reinforced Isolation Voltage | 7071 VPEAK | |||
| Common-Mode Transient Immunity (ISO224B) | 80 | kV/µs |
Key Features
- Offered in High-Grade (ISO224B) and Low-Grade (ISO224A) versions
- ±12-V input voltage range optimized for isolated voltage measurement in industrial applications
- Overvoltage input clamp with 9-kV ESD protection
- ±4-V differential output voltage range with common-mode at VDD2 / 2
- Low DC-error operation (ISO224B): input offset, gain error, and nonlinearity optimized for high accuracy
- 4.5-V to 18-V single-supply on high-side and 4.5-V to 5.5-V operation on low-side
- Safety-related certifications: 7071-VPEAK reinforced isolation per DIN VDE V 0884-11: 2017-01 and 5000-VRMS isolation for 1 minute per UL1577
- High common-mode transient immunity (CMTI) of up to 80 kV/µs (typ) for ISO224B
Applications
- Isolated analog signal acquisition in grid automation
- Protection relays
- Factory automation and control
- Rail transport
- Motor drives
- Power analyzers
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 key differences between the ISO224B and ISO224A versions?
The ISO224B is a high-grade version with lower input offset, gain error, and nonlinearity compared to the ISO224A low-grade version.
- What is the differential output voltage range of the ISO224?
The differential output voltage range is ±4 V with the common-mode output voltage at VDD2 / 2.
- What are the safety-related certifications of the ISO224?
The ISO224 has certifications for 7071-VPEAK reinforced isolation per DIN VDE V 0884-11: 2017-01 and 5000-VRMS isolation for 1 minute per UL1577.
- What is the operating temperature range of the ISO224?
The operating temperature range is from -55°C to 125°C.
- How does the ISO224 protect against overvoltage?
The ISO224 features an overvoltage input clamp with 9-kV ESD protection.
- What is the common-mode transient immunity (CMTI) of the ISO224B?
The CMTI of the ISO224B is up to 80 kV/µs (typ).
- What are some typical applications of the ISO224?
Typical applications include isolated analog signal acquisition in grid automation, protection relays, factory automation, rail transport, motor drives, and power analyzers.
- How does the ISO224 simplify the design of isolated power supplies?
The ISO224 operates on a single supply on the high-side, simplifying the design of the isolated power supply and reducing system cost.
- What is the significance of the integrated high-side supply voltage detection feature?
The integrated high-side supply voltage detection feature simplifies system-level diagnostics.
