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OPA2380AIDGKTG4 Datasheet(PDF) 10 Page - Texas Instruments |
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OPA2380AIDGKTG4 Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 22 page  OPA380 OPA2380 SBOS291G − NOVEMBER 2003 − REVISED SEPTEMBER 2007 www.ti.com 10 OUTPUT RANGE The OPA380 is specified to swing within at least 600mV of the positive rail and 100mV of the negative rail with a 2k Ω load with excellent linearity. Swing to the negative rail while maintaining good linearity can be extended to 0V—see the section, Achieving Output Swing to Ground. See the Typical Characteristic curve, Output Voltage Swing vs Output Current. The OPA380 can swing slightly closer than specified to the positive rail; however, linearity will decrease and a high-speed overload recovery clamp limits the amount of positive output voltage swing available, as shown in Figure 2. 20 15 10 5 0 −5 −10 −15 −20 OFFSET VOLTAGE vs OUTPUT VOLTAGE V OUT (V) 0 123 4 5 V S =5V R P =2kΩ connected to −5V R L =2kΩ connected to VS /2 Effect of clamp Figure 2. Effect of High-Speed Overload Recovery Clamp on Output Voltage OVERLOAD RECOVERY The OPA380 has been designed to prevent output saturation. After being overdriven to the positive rail, it will typically require only 100ns to return to linear operation. The time required for negative overload recovery is greater, unless a pull-down resistor connected to a more negative supply is used to extend the output swing all the way to the negative rail—see the following section, Achieving Output Swing to Ground. ACHIEVING OUTPUT SWING TO GROUND Some applications require output voltage swing from 0V to a positive full-scale voltage (such as +4.096V) with excellent accuracy. With most single-supply op amps, problems arise when the output signal approaches 0V, near the lower output swing limit of a single-supply op amp. A good single-supply op amp may swing close to single-supply ground, but will not reach 0V. The output of the OPA380 can be made to swing to ground, or slightly below, on a single-supply power source. This extended output swing requires the use of another resistor and an additional negative power supply. A pull-down resistor may be connected between the output and the negative supply to pull the output down to 0V. See Figure 3. OPA380 V OUT R F R P =2kΩ V+ = +5V V − =Gnd V P = −5V Negative Supply λ Figure 3. Amplifier with Optional Pull-Down Resistor to Achieve VOUT = 0V The OPA380 has an output stage that allows the output voltage to be pulled to its negative supply rail using this technique. However, this technique only works with some types of output stages. The OPA380 has been designed to perform well with this method. Accuracy is excellent down to 0V. Reliable operation is assured over the specified temperature range. |
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