Texas Instruments ISO224BDWVR

Overview

ISO224BDWVR from Texas Instruments is a reinforced isolated precision amplifier with single-ended ±12 V input and differential ±4 V output, optimized for high-accuracy voltage sensing in industrial isolation barriers. It features ±5 mV input offset (25°C), ±0.3% gain error, 275 kHz bandwidth, 80 kV/µs CMTI, and operates across –55°C to +125°C - enabling direct interface with protection relays and motor drive current shunts.

For engineers reviewing the ISO224BDWVR datasheet, ISO224BDWVR pinout, ISO224BDWVR application, or ISO224BDWVR equivalent, key selection criteria include reinforced isolation certification (7071 V_PEAK, 5000 V_RMS), dual-supply operation (4.5–18 V on high-side, 4.5–5.5 V on low-side), differential output compatibility with low-cost ADCs like ADS7945, and ±12 V input range for legacy industrial signal standards.

Technical Context

The ISO224BDWVR uses a SiO₂-based double-capacitive isolation barrier with delta-sigma modulation and on-chip oscillator, delivering galvanic separation between high-side analog input and low-side differential output domains. Its internal LDO regulates high-side supply detection and supports fail-safe output behavior when VDD1 is lost.

Signal path includes high-impedance input stage (1.25 MΩ, 2 pF), modulator-based isolation, and low-side DAC reconstruction producing V_CMOUT = VDD2/2 with ±4 V differential swing. Output common-mode is tightly regulated (±2% of VDD2), and THD remains ≤–84 dB at 10 kHz - critical for precision power analyzer front-ends.

Key Specifications

Pinout & Package

ISO224BDWVR is housed in a wide-body 8-pin SOIC (DWV) package measuring 5.85 mm × 7.5 mm, with creepage and clearance ≥8.5 mm to meet reinforced insulation requirements for 1500 V_RMS working voltage.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar isolated amplifier applications.

Compared with ISO224ADWVR and AMC1301DWVR, ISO224BDWVR delivers superior DC accuracy, wider input range, and higher CMTI - making it the only option qualified for protection relay voltage inputs and grid automation metering where long-term stability and transient immunity are mandatory.

Availability

ISO224BDWVR is available at Aetrix Electronics and suitable for grid automation, protection relays, and motor drives requiring stable component supply, long-lifecycle assurance, and compliance with reinforced isolation safety standards.

Supply support for ISO224BDWVR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in isolation, precision amplification, and industrial-grade signal conditioning.

The ISO224 product line was designed specifically for high-reliability industrial voltage sensing - emphasizing reinforced isolation integrity, wide temperature operation, and seamless integration with 14-bit ADCs in safety-critical energy infrastructure systems.

FAQ

What is the maximum input voltage the ISO224BDWVR can withstand before clipping?

The ISO224BDWVR features an integrated overvoltage clamp that limits input voltage to ±13.8 V (IN to GND1). Within its specified linear range, it maintains ±12 V full-scale operation with <0.01% nonlinearity. Exceeding ±13.8 V risks permanent damage, so external protection is unnecessary for typical industrial transients - the ISO224BDWVR itself provides 9-kV HBM ESD protection on the IN pin.

Does the ISO224BDWVR require separate isolated power supplies for both sides?

Yes, the ISO224BDWVR requires two independent supplies: VDD1 (4.5–18 V) on the high-side for the input stage and modulator, and VDD2 (4.5–5.5 V) on the low-side for the output DAC and digital circuitry. The device does not include an integrated DC-DC converter, so external isolated power - such as a transformer-based module or capacitive isolator with LDO - must be used. This architecture ensures galvanic separation meets reinforced insulation requirements.

How does the failsafe output behavior of the ISO224BDWVR function during power loss?

When VDD1 is lost or drops below operational threshold, the ISO224BDWVR forces both OUTP and OUTN to GND2 within 5 µs, producing a defined 0 V differential output. This failsafe state prevents undefined ADC readings or erroneous control decisions in safety-critical systems like protection relays. The feature is implemented entirely on-chip and requires no external components - the ISO224BDWVR actively drives the outputs low rather than entering a high-impedance state.

Can the ISO224BDWVR drive a 10-kΩ load directly, and what is its output resistance?

Yes, the ISO224BDWVR is specified to drive a minimum 10-kΩ resistive load (R_LOAD) on each output (OUTP or OUTN to GND2) while maintaining performance. Its output resistance is <0.5 Ω, ensuring minimal gain error due to loading. For capacitive loads, it supports up to 100 pF directly; beyond that, a series resistor is recommended per datasheet Figure 12 to maintain stability - critical when interfacing with long PCB traces or ADC input filters in ISO224BDWVR-based designs.

What certifications apply to the ISO224BDWVR's isolation barrier?

The ISO224BDWVR's isolation barrier is certified to DIN VDE V 0884-11:2017-01 (reinforced) for 7071 V_PEAK transient overvoltage and UL1577 for 5000 V_RMS for 1 minute. It also complies with IEC 60950-1 and IEC 60065 for end-equipment safety. These certifications are production-tested - every unit undergoes 100% 6000 V_RMS (1.2× rating) isolation test - and support use in safety-critical applications including grid infrastructure and railway signaling where certification traceability is mandatory for ISO224BDWVR deployment.