ISO224A

Part: ISO224BDWV (ISO224 family; ISO224B high-grade, ISO224A low-grade) — Texas Instruments

Type: Reinforced Isolated Amplifier (single-ended input, differential output)

Description: Precision reinforced isolated amplifier with ±12 V single-ended input, ±4 V differential output (nominal gain 1/3), 5000 VRMS isolation, 4.5–18 V high-side supply and 4.5–5.5 V low-side supply.

Operating Conditions:

• High-side supply (VDD1 to GND1): 4.5–18 V (5 V nominal)
• Low-side supply (VDD2 to GND2): 4.5–5.5 V
• Operating ambient temperature: -55 to 125 °C
• Specified linear input full-scale range: -12 V to 12 V (clipping at ±13.8 V)

Absolute Maximum Ratings:

• Max supply voltage: VDD1 to GND1 26 V; VDD2 to GND2 6.5 V
• Input voltage (IN to GND1): -15 V to 15 V
• Continuous input current at IN pin: ±10 mA
• Max junction temperature: 150 °C
• Storage temperature: -65 to 150 °C

Key Specs:

• Input offset voltage (ISO224B, TA = 25 °C): ±5 mV max; drift ±15 μV/°C max
• Gain error (ISO224B, TA = 25 °C): ±0.3% max; drift ±35 ppm/°C max
• Nonlinearity (ISO224B): ±0.01% max
• Input resistance: 1 MΩ min, 1.25 MΩ typ
• Input-referred noise density (ISO224B): 3 μV/√Hz typ
• THD (fIN = 10 kHz): -84 dB typ
• Output bandwidth (ISO224B): 275 kHz typ; IN to OUT delay 2.2 μs typ
• CMTI (ISO224B): 80 kV/μs typ
• Common-mode output voltage: VDD2 / 2 (0.48–0.52 × VDD2)

Features:

• High-grade (ISO224B) and low-grade (ISO224A) versions
• ±12 V input range optimized for isolated voltage measurement
• Overvoltage input clamp with 9 kV ESD (HBM, IN pin)
• ±4 V differential output with common-mode at VDD2 / 2
• Single-supply operation on the high side
• High-side supply voltage detection for diagnostics
• 7071 VPEAK reinforced isolation per DIN VDE V 0884-11:2017-01
• 5000 VRMS isolation for 1 minute per UL1577

Applications:

• Grid automation
• Protection relays
• Factory automation and control
• Rail transport
• Motor drives
• Power analyzers

Package:

• SOIC-8 wide-body (DWV), 5.85 mm × 7.5 mm

• 1 · 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
• ±4-V Differential Output Voltage Range With Common-Mode at VDD2 / 2
• Low DC-Error Operation (ISO224B):
• -Input Offset: ±5 mV at 25°C, ±15 μV/°C max
• -Gain Error: ±0.3% at 25°C, ±35 ppm/°C max
• -Nonlinearity: ±0.01% max, ±0.1 ppm/°C typ
• 4.5-V to 18-V Single-Supply on High-Side
• 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
• -5000-VRMS Isolation for 1 Minute per UL1577
• High CMTI (ISO224B): 80 kV/μs (typ)

• Isolated Analog Signal Acquisition in:
• -Grid Automation
• -Protection Relays
• -Factory Automation and Control
• -Rail Transport
• -Motor Drives
• -Power Analyzers

1

ISO224

SBAS738A -JUNE 2018-REVISED OCTOBER 2018

Pin Functions

minimum and maximum specifications apply from TA = -55°C to +125°C, VDD1 = 4.5 V to 18 V, VDD2 = 4.5 V to 5.5 V, VIN = -12 V to 12 V, and RLOAD = 10 k Ω ; typical specifications are at TA = 25°C, and VDD1 = VDD2 = 5 V (unless otherwise noted)

see (1)

over operating ambient temperature range (unless otherwise noted)

The ISO224 enables high-precision measurement of ±10-V signals that are used in a harsh environment in a wide range of industrial applications. The high input resistance of the device simplifies the connection of its input to different sensors or other signal sources. The very low nonlinearity, AC and DC errors, and temperature drift make the ISO224 a robust, high-performance, isolated amplifier for applications where high voltage isolation is required. The differential output with a full-scale voltage of 4 V offers high immunity to noise and allows connection to a wide range of analog-to-digital converters (ADCs) powered on a 5-V nominal supply.