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SINGLE_SUPPLY_BRIDGE_AMPLIFIER

2016-05-17 21:47  
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SINGLE_SUPPLY_BRIDGE_AMPLIFIER
The INA118 can be used on single-power supplies of +2.7 to +36V. The figure shown is a basic single-supply circuit. The output Ref terminal is connected to ground. Zero differential input voltage will dentand an output voltage of 0V (ground). Actual output voltage swing is limited to approxi-mately 35 mV above ground, when the load is referred to ground as shown. The typical performance curve “Output Voltage”, Output Current shows how the output voltage swing varies with output current. With single-supply operation, +VIN and -VIN must both be 1.1V above ground for linear operation. You cannot, for instance, connect the inverting input to ground and measure a voltage connected to the noninverting input.To illustrate the issues affecting low-voltage operation, consider the circuit in the figure. It shows the INA118, operating from a single 3-V supply. A resistor in series with the low side of the bridge en-sures that the bridge output voltage is within the common-rqode range of the amplifier's inputs.