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ISO224 Datasheet(PDF) 15 Page - Texas Instruments |
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ISO224 Datasheet(HTML) 15 Page - Texas Instruments |
15 / 25 page VDD2 VDD1 ISO224 5 V VAC R1 R2 AC Voltage Source GND1 VIN RFLTin CFLTin GND1 GND2 5 V ADC RFLTout RFLTout CFLTout GND2 IAC 15 ISO224 www.ti.com SBAS738 – JUNE 2018 Product Folder Links: ISO224 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated 9 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 9.1 Application Information 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 4-V output 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. 9.2 Typical Application Isolated amplifiers are often used for data acquisition in industrial applications to safely separate the low-voltage portion of the system from the high common-mode voltage input of the system. The input structure of the ISO224 is optimized for isolated voltage sensing in this kind of application. Figure 9 shows a typical operation of the device for voltage sensing as used in power line monitoring systems. The phase voltage amplitude is reduced with a resistive divider to match the input voltage range of the ISO224. The high input voltage range and the high common-mode transient immunity of the device ensure reliable and accurate operation even in high-noise environments. Figure 9. Using the ISO224 for AC Voltage Sensing 9.2.1 Design Requirements Table 1 summarizes the typical design requirements for an AC power line voltage sensing application. Table 1. Design Requirements PARAMETER VALUE AC voltage range, VAC 50 V to 750 V Bandwidth 600 Hz (minimum) Current through the resistive divider, IAC 1 mA (maximum) |
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