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LM2917N-14 Fiches technique(PDF) 1 Page - National Semiconductor (TI) |
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LM2917N-14 Fiches technique(HTML) 1 Page - National Semiconductor (TI) |
1 / 18 page TLH7942 February 1995 LM2907LM2917 Frequency to Voltage Converter General Description The LM2907 LM2917 series are monolithic frequency to voltage converters with a high gain op ampcomparator de- signed to operate a relay lamp or other load when the input frequency reaches or exceeds a selected rate The tachom- eter uses a charge pump technique and offers frequency doubling for low ripple full input protection in two versions (LM2907-8 LM2917-8) and its output swings to ground for a zero frequency input Advantages Y Output swings to ground for zero frequency input Y Easy to use VOUT e fIN c VCC c R1 c C1 Y Only one RC network provides frequency doubling Y Zener regulator on chip allows accurate and stable fre- quency to voltage or current conversion (LM2917) Features Y Ground referenced tachometer input interfaces directly with variable reluctance magnetic pickups Y Op ampcomparator has floating transistor output Y 50 mA sink or source to operate relays solenoids me- ters or LEDs Y Frequency doubling for low ripple Y Tachometer has built-in hysteresis with either differen- tial input or ground referenced input Y Built-in zener on LM2917 Y g 03% linearity typical Y Ground referenced tachometer is fully protected from damage due to swings above VCC and below ground Applications Y Overunder speed sensing Y Frequency to voltage conversion (tachometer) Y Speedometers Y Breaker point dwell meters Y Hand-held tachometer Y Speed governors Y Cruise control Y Automotive door lock control Y Clutch control Y Horn control Y Touch or sound switches Block and Connection Diagrams Dual-In-Line and Small Outline Packages Top Views TLH7942 – 1 Order Number LM2907M-8 or LM2907N-8 See NS Package Number M08A or N08E TLH7942 – 2 Order Number LM2917M-8 or LM2917N-8 See NS Package Number M08A or N08E TLH7942 – 3 Order Number LM2907N See NS Package Number N14A TLH7942 – 4 Order Number LM2917M or LM2917N See NS Package Number M14A or N14A C1995 National Semiconductor Corporation RRD-B30M115Printed in U S A |
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Description similaire - LM2917N-14 |
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