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OPA2333AIDRG4 Datasheet(PDF) 8 Page - Burr-Brown (TI) |
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OPA2333AIDRG4 Datasheet(HTML) 8 Page - Burr-Brown (TI) |
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8 / 18 page  OPA333 OPA2333 SBOS351 − MARCH 2006 www.ti.com 8 ACHIEVING OUTPUT SWING TO THE OP AMP NEGATIVE RAIL Some applications require output voltage swings from 0V to a positive full-scale voltage (such as +2.5V) 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 ground. The output of the OPA333 and OPA2333 can be made to swing to ground, or slightly below, on a single-supply power source. To do so requires the use of another resistor and an additional, more negative, power supply than the op amp negative supply. A pull-down resistor may be connected between the output and the additional negative supply to pull the output down below the value that the output would otherwise achieve, as shown in Figure 2. V OUT R P = 20kΩ Op Amp V − =Gnd OPA333 V IN V+=+5V −5V Additional Negative Supply Figure 2. For VOUT Range to Ground The OPA333 and OPA2333 have an output stage that allows the output voltage to be pulled to its negative supply rail, or slightly below, using the technique previously described. This technique only works with some types of output stages. The OPA333 and OPA2333 have been characterized to perform with this technique; however, the recommended resistor value is approximately 20k Ω. Note that this configuration will increase the current consumption by several hundreds of microamps. Accuracy is excellent down to 0V and as low as −2mV. Limiting and nonlinearity occurs below−2mV, but excellent accuracy returns as the output is again driven above −2mV. Lowering the resistance of the pull-down resistor will allow the op amp to swing even further below the negative rail. Resistances as low as 10k Ω can be used to achieve excellent accuracy down to −10mV. GENERAL LAYOUT GUIDELINES Attention to good layout practices is always recommended. Keep traces short and, when possible, use a printed circuit board (PCB) ground plane with surface-mount components placed as close to the device pins as possible. Place a 0.1 µF capacitor closely across the supply pins. These guidelines should be applied throughout the analog circuit to improve performance and provide benefits such as reducing the EMI (electromagnetic-interference) susceptibility. Operational amplifiers vary in their susceptibility to radio frequency interference (RFI). RFI can generally be identified as a variation in offset voltage or dc signal levels with changes in the interfering RF signal. The OPA333 has been specifically designed to minimize susceptibility to RFI and demonstrates remarkably low sensitivity compared to previous generation devices. Strong RF fields may still cause varying offset levels.. ++ + −− 4.096V 0.1 µF +5V Zero Adj. K−Type Thermocouple 40.7 µV/_C R 2 549 Ω R 9 150k Ω R 5 31.6k Ω R 1 6.04k Ω R 6 200 Ω +5V 0.1 µF R 2 2.94k Ω V O R 3 60.4 Ω R 4 6.04k Ω O PA333 D1 REF3140 Figure 3. Temperature Measurement |
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Similar Description - OPA2333AIDRG4 |
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