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OPA330AIDG4 Datasheet(PDF) 10 Page - Texas Instruments |
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OPA330AIDG4 Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 29 page  V OUT R =20kW P OpAmpV =GND - OPA330 V IN V+=+5V -5V Additional Negative Supply R 1 V EX V OUT V REF R 1 OPA330 R R R R +5V OPA330 ADS1100 Load V I C 2 R 1 4.99kW R 3 4.99kW R 4 48.7kW R 2 49.9kW +5V 3V REF3130 R 7 1.18kW R SHUNT 1W R 6 71.5kW R N 56W R N 56W (PGAGain=4) FS=3.0V StrayGround-LoopResistance I LOAD OPA330 OPA2330 OPA4330 SBOS432D – AUGUST 2008 – REVISED JUNE 2010 www.ti.com ACHIEVING OUTPUT SWING TO THE OP The OPA330, OPA2330, and OPA4330 have an AMP NEGATIVE RAIL output stage that allows the output voltage to be pulled to its negative supply rail, or slightly below, Some applications require output voltage swings from using the technique previously described. This 0V to a positive full-scale voltage (such as +2.5V) technique only works with some types of output with excellent accuracy. With most single-supply op stages. The OPA330, OPA2330, and OPA4330 have amps, problems arise when the output signal been characterized to perform with this technique; the approaches 0V, near the lower output swing limit of a recommended resistor value is approximately 20k Ω. single-supply op amp. A good single-supply op amp Note that this configuration will increase the current may swing close to single-supply ground, but will not consumption by several hundreds of microamps. reach ground. The output of the OPA330, OPA2330, Accuracy is excellent down to 0V and as low as and OPA4330 can be made to swing to ground, or –2mV. Limiting and nonlinearity occurs below –2mV, slightly below, on a single-supply power source. To but excellent accuracy returns as the output is again do so requires the use of another resistor and an driven above –2mV. Lowering the resistance of the additional, more negative, power supply than the op pull-down resistor will allow the op amp to swing even amp negative supply. A pull-down resistor may be further below the negative rail. Resistances as low as connected between the output and the additional 10k Ω can be used to achieve excellent accuracy negative supply to pull the output down below the down to –10mV. value that the output would otherwise achieve, as shown in Figure 20. APPLICATION CIRCUITS Figure 21 shows the basic configuration for a bridge amplifier. A low-side current shunt monitor is shown in Figure 22. Figure 20. For VOUT Range to Ground Figure 21. Single Op Amp Bridge Amplifier NOTE: 1% resistors provide adequate common-mode rejection at small ground-loop errors. Figure 22. Low-Side Current Monitor 10 Submit Documentation Feedback Copyright © 2008–2010, Texas Instruments Incorporated Product Folder Link(s): OPA330 OPA2330 OPA4330 |
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