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OPA2322 Datasheet(PDF) 11 Page - Texas Instruments |
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OPA2322 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 29 page R S OPA322 V+ V IN V OUT I 10mA,Max OVERLOAD 4 3 2 1 0 1 2 3 4 - - - - -500 1000 Time( s) m -250 0 750 250 500 V OUT V IN V = 2.5V ± S OPA322, OPA322S OPA2322, OPA2322S OPA4322, OPA4322S www.ti.com SBOS538A – JANUARY 2011 – REVISED MAY 2011 APPLICATION INFORMATION OPERATING VOLTAGE The OPA322 series op amps are unity-gain stable and can operate on a single-supply voltage (1.8 V to 5.5 V), or a split-supply voltage ( ±0.9 V to ±2.75 V), making them highly versatile and easy to use. The power-supply pins should have local bypass ceramic capacitors (typically 0.001 μF to 0.1 μF). These amplifiers are fully specified from +1.8 V to +5.5 V and over the extended temperature range of –40°C to +125°C. Parameters that can exhibit variance with regard to operating voltage or temperature are presented in the Typical Characteristics. INPUT AND ESD PROTECTION The OPA322 incorporates internal electrostatic discharge (ESD) protection circuits on all pins. In the case of input and output pins, this protection primarily consists of current-steering diodes connected between the input and power-supply pins. These ESD protection diodes also provide in-circuit input overdrive protection, as long as the current is limited to 10 mA as stated in the Absolute Maximum Ratings table. Many input signals are inherently current-limited to less than 10 mA; therefore, a limiting resistor is not required. Figure 25 shows how a series input resistor (RS) may be added to the driven input to limit the input current. The added resistor contributes thermal noise at the amplifier input and the value should be kept to the minimum in noise-sensitive applications. Figure 25. Input Current Protection PHASE REVERSAL The OPA322 op amps are designed to be immune to phase reversal when the input pins exceed the supply voltages, therefore providing further in-system stability and predictability. Figure 26 shows the input voltage exceeding the supply voltage without any phase reversal. Figure 26. No Phase Reversal Copyright © 2011, Texas Instruments Incorporated 11 |
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