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OPA333AMDBVREP Datasheet(PDF) 8 Page - Texas Instruments |
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OPA333AMDBVREP Datasheet(HTML) 8 Page - Texas Instruments |
8 / 19 page APPLICATION INFORMATION The OPA333A and OPA2333A are unity-gain stable and free from unexpected output phase reversal. They use a Operating Voltage Input Voltage 5k Ω OPA333A 10mA max +5V V IN V OUT I OVERLOAD Current−limiting resistor required if input voltage exceeds supply rails by ≥ 0.5V. Internal Offset Correction OPA333A-EP ,, OPA2333A-EP SGLS383B – APRIL 2007 – REVISED JUNE 2008 ............................................................................................................................................................ www.ti.com 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 ensuring they are equal on both input terminals. Other layout and design considerations include: • Use low thermoelectric-coefficient conditions (avoid dissimilar metals) • Thermally isolate components from power supplies or other heat sources • 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. The OPA333A and OPA2333A op amps operate over a power-supply range of 1.8 V to 5.5 V (±0.9 V to ±2.75 V). Supply voltages higher than 7 V (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. The OPA333A and OPA2333A input common-mode voltage range extends 0.1 V beyond the supply rails. The OPA333A 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 70 pA; 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 10 mA. This limitation is easily accomplished with an input resistor(see Figure 1). Figure 1. Input Current Protection The OPA333A and OPA2333A op amps use an auto-calibration technique with a time-continuous 350-kHz 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 V OS accuracy. This design has no aliasing or flicker noise. 8 Submit Documentation Feedback Copyright © 2007–2008, Texas Instruments Incorporated Product Folder Link(s): OPA333A-EP OPA2333A-EP |
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