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Two-stage current sensors

16.07.2007

Texas Instruments introduced two current sensors with a common-mode input voltage range of -16V to 80V. The INA270 and INA271 have a two-stage architecture and are designed for applications where input signal filtering is required.

To solve the problems encountered when measuring low shunt voltage drops in the presence of high common mode voltage, filter circuits can be inserted between the INA270 and INA271 stages to maintain a buffered output voltage. As a result, when driving ADCs or low-impedance loads, no additional amplifiers are required. The range of common-mode voltages at the input of INA270 and INA271 is from -16 V (reverse voltage of a car battery) to voltages during short-term overloads of +80 V. At the same time, the range of supply voltages for devices from a single source is from +2,7 to +18 V.

The devices are distinguished by high accuracy (maximum error no more than 3% over the entire temperature range), wide bandwidth (130 kHz), low quiescent current (maximum 900 μA) and an extended temperature range of -40...125°C. The available gains are 14 for the INA270 and 20 for the INA271. Both devices can also be used in telecommunications equipment, laptop computers, soldering stations, measuring and testing systems.

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