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OPA2333AIDRG4 Datasheet(PDF) 7 Page - Burr-Brown (TI) |
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OPA2333AIDRG4 Datasheet(HTML) 7 Page - Burr-Brown (TI) |
7 / 18 page OPA333 OPA2333 SBOS351 − MARCH 2006 www.ti.com 7 APPLICATIONS INFORMATION The OPA333 and OPA2333 are unity-gain stable and free from unexpected output phase reversal. They use a proprietary auto-calibration technique to provide low offset voltage and very low drift over time and temperature. For lowest offset voltage and precision performance, circuit layout and mechanical conditions should be optimized. Avoid temperature gradients that create thermoelectric (Seebeck) effects in the thermocouple junctions formed from connecting dissimilar conductors. These thermally-generated potentials can be made to cancel by assuring they are equal on both input terminals. Other layout and design considerations include: D Use low thermoelectric-coefficient conditions (avoid dissimilar metals). D Thermally isolate components from power supplies or other heat sources. D Shield op amp and input circuitry from air currents, such as cooling fans. Following these guidelines will reduce the likelihood of junctions being at different temperatures, which can cause thermoelectric voltages of 0.1 µV/°C or higher, depending on materials used. OPERATING VOLTAGE The OPA333 and OPA2333 op amps operate over a power-supply range of +1.8V to +5.5V ( ±0.9V to ±2.75V). Supply voltages higher than +7V (absolute maximum) can permanently damage the device. Parameters that vary over supply voltage or temperature are shown in the Typical Characteristics section of this data sheet. INPUT VOLTAGE The OPA333 and OPA2333 input common-mode voltage range extends 0.1V beyond the supply rails. The OPA333 is designed to cover the full range without the troublesome transition region found in some other rail-to-rail amplifiers. Normally, input bias current is about 70pA; however, input voltages exceeding the power supplies can cause excessive current to flow into or out of the input pins. Momentary voltages greater than the power supply can be tolerated if the input current is limited to 10mA. This limitation is easily accomplished with an input resistor, as shown in Figure 1. 5k Ω OPA333 10mA max +5V V IN V OUT I OVERLOAD Current−limiting resistor required if input voltage exceeds supply rails by ≥ 0.5V. Figure 1. Input Current Protection INTERNAL OFFSET CORRECTION The OPA333 and OPA2333 op amps use an auto-calibration technique with a time-continuous 350kHz op amp in the signal path. This amplifier is zero-corrected every 8 µs using a proprietary technique. Upon power-up, the amplifier requires approximately 100 µs to achieve specified VOS accuracy. This design has no aliasing or flicker noise. |
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