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OPA333AIDCKR Datasheet(PDF) 9 Page - Texas Instruments |
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OPA333AIDCKR Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 28 page  www.ti.com ACHIEVING OUTPUT SWING TO THE OP GENERAL LAYOUT GUIDELINES V OUT R =20k W P OpAmpV =GND - OPA333 V IN V+=+5V -5V Additional Negative Supply + + + - - 4.096V 0.1 F m +5V ZeroAdj. K-Type Thermocouple 40.7 V/ C m ° R 2 549 W R 9 150k W R 5 31.6k W R 1 6.04k W R 6 200 W +5V 0.1 F m R 2 2.94k W V O R 3 60.4 W R 4 6.04k W OPA333 D1 REF3140 OPA333 OPA2333 SBOS351C – MARCH 2006 – REVISED MAY 2007 works with some types of output stages. The AMP NEGATIVE RAIL OPA333 and OPA2333 have been characterized to perform with this technique; the recommended Some applications require output voltage swings resistor value is approximately 20k Ω. Note that this from 0V to a positive full-scale voltage (such as configuration will increase the current consumption +2.5V) with excellent accuracy. With most by several hundreds of microamps. Accuracy is single-supply op amps, problems arise when the excellent down to 0V and as low as –2mV. Limiting output signal approaches 0V, near the lower output and nonlinearity occurs below –2mV, but excellent swing limit of a single-supply op amp. A good accuracy returns as the output is again driven above single-supply op amp may swing close to –2mV. Lowering the resistance of the pull-down single-supply ground, but will not reach ground. The resistor will allow the op amp to swing even further output of the OPA333 and OPA2333 can be made to below the negative rail. Resistances as low as 10k Ω swing to ground, or slightly below, on a single-supply can be used to achieve excellent accuracy down to power source. To do so requires the use of another –10mV. 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 Attention to good layout practices is always below the value that the output would otherwise recommended. Keep traces short and, when achieve, as shown in Figure 19. 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 Figure 19. For VOUT Range to Ground remarkably low sensitivity compared to previous generation devices. Strong RF fields may still cause varying offset levels. 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 Figure 20. Temperature Measurement 9 Submit Documentation Feedback |
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