Datenblatt-Suchmaschine für elektronische Bauteile |
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LM231A Datenblatt(PDF) 8 Page - National Semiconductor (TI) |
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LM231A Datenblatt(HTML) 8 Page - National Semiconductor (TI) |
8 / 16 page Typical Applications (Continued) DETAILS OF OPERATION FREQUENCY-TO- VOLTAGE CONVERTERS (FIGURES 5 AND 6 ) In these applications a pulse input at fIN is differentiated by a C-R network and the negative-going edge at pin 6 causes the input comparator to trigger the timer circuit Just as with a V-to-F converter the average current flowing out of pin 1 is IAVERAGE e i c (11 RtCt) c f In the simple circuit of FIGURE 5 this current is filtered in the network RL e 100 kX and 1 mF The ripple will be less than 10 mV peak but the response will be slow with a 01 second time constant and settling of 07 second to 01% accuracy In the precision circuit an operational amplifier provides a buffered output and also acts as a 2-pole filter The ripple will be less than 5 mV peak for all frequencies above 1 kHz and the response time will be much quicker than in Figure 5 However for input frequencies below 200 Hz this circuit will have worse ripple than Figure 5 The engineering of the filter time-constants to get adequate response and small enough ripple simply requires a study of the compromises to be made Inherently V-to-F converter response can be fast but F-to-V response can not TLH5680 – 6 Use stable components with low temperature coefficients See Typical Applications section This resistor can be 5 kX or 10 kX for VSe8V to 22V but must be 10 kX for VSe45V to 8V Use low offset voltage and low offset current op amps for A1 recommended types LF411A or LF356 FIGURE 4 Precision Voltage-to-Frequency Converter 100 kHz Full-Scale g003% Non-Linearity TLH5680 – 7 VOUT e fIN c 209V c RL RS c (RtCt) Use stable components with low temperature coefficients FIGURE 5 Simple Frequency-to-Voltage Converter 10 kHz Full-Scale g006% Non-Linearity VOUT ebfIN c 209V c RF RS c (RtCt) TLH5680 – 8 SELECT Rx e (VS b 2V) 02 mA Use stable components with low temperature coefficients FIGURE 6 Precision Frequency-to-Voltage Converter 10 kHz Full-Scale with 2-Pole Filter g001% Non-Linearity Maximum 8 |
Ähnliche Teilenummer - LM231A |
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Ähnliche Beschreibung - LM231A |
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