Datenblatt-Suchmaschine für elektronische Bauteile |
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OP290 Datenblatt(PDF) 8 Page - Analog Devices |
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OP290 Datenblatt(HTML) 8 Page - Analog Devices |
8 / 12 page REV. B OP290 –8– From the formulas, it can be seen that if the span trim is adjusted before the zero trim, the two trims are not interactive, which greatly simplifies the calibration procedure. Calibration of the transmitter is simple. First, the slope of the output current versus temperature is calibrated by adjusting the span trim, R7. A couple of iterations may be required to be sure the slope is correct. Once the span trim has been completed, the zero trim can be made. Remember that adjusting the offset trim will not affect the gain. The offset trim can be set at any known temperature by adjusting R5 until the output current equals: I I T TT mA OUT FS OPERATING AMBIENT MIN = () + ∆ ∆ –4 Table I shows the values of R6 required for various tempera- ture ranges. VARIABLE SLEW RATE FILTER The circuit shown in Figure 6 can be used to remove pulse noise from an input signal without limiting the response rate to a genu- ine signal. The nonlinear filter has use in applications where the input signal of interest is known to have physical limitations. An example of this is a transducer output where a change of temperature or pressure cannot exceed a certain rate due to physical limitations of the environment. The filter consists of a comparator which drives an integrator. The comparator com- pares the input voltage to the output voltage and forces the integrator output to equal the input voltage. A1 acts as a com- parator with its output high or low. Diodes D1 and D2 clamp the voltage across R3 forcing a constant current to flow in or out of C2. R3, C2, and A2 form an integrator with A2’s output slewing at a maximum rate of: Maximum slew rate V RC V RC D =≈ 32 06 32 . For an input voltage slewing at a rate under this maximum slew rate, the output simply follows the input with A1 operating in its linear region. 1/2 OP290GP VIN VOUT VTEMP GND 6 3 2 4 R1 10k REF-43BZ 2N1711 V+ 8V TO 40V 1N4002 SPAN TRIM R10 100 1%, 1/2W R9 100k R8 1k R3 100k R5 5k R2 1k VTEMP 4 8 2 ZERO TRIM VSET R4 20k R6 3k R7 5k IOUT RLOAD 7 6 5 1 1/2 OP290GP Figure 5. Temperature to 4-20 mA Transmitter Table I. Temperature Range R6 (k ) 0 °C to +70°C10 –40 °C to +85°C 6.2 –55 °C to +150°C3 |
Ähnliche Teilenummer - OP290_03 |
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Ähnliche Beschreibung - OP290_03 |
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