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LM2907M датащи(PDF) 1 Page - Texas Instruments |
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LM2907M датащи(HTML) 1 Page - Texas Instruments |
1 / 31 page LM2907-N, LM2917-N www.ti.com SNAS555C – JUNE 2000 – REVISED MARCH 2013 LM2907/LM2917 Frequency to Voltage Converter Check for Samples: LM2907-N, LM2917-N 1 FEATURES DESCRIPTION The LM2907, LM2917 series are monolithic 2 • Ground Referenced Tachometer Input frequency to voltage converters with a high gain op Interfaces Directly With Variable Reluctance amp/comparator designed to operate a relay, lamp, or Magnetic Pickups other load when the input frequency reaches or • Op Amp/Comparator Has Floating Transistor exceeds a selected rate. The tachometer uses a Output charge pump technique and offers frequency doubling for low ripple, full input protection in two • 50 mA Sink or Source to Operate Relays, versions (LM2907-8, LM2917-8) and its output swings Solenoids, Meters, or LEDs to ground for a zero frequency input. • Frequency Doubling For Low Ripple The op amp/comparator is fully compatible with the • Tachometer Has Built-In Hysteresis With tachometer and has a floating transistor as its output. Either Differential Input or Ground Referenced This feature allows either a ground or supply referred Input load of up to 50 mA. The collector may be taken • Built-In Zener on LM2917 above VCC up to a maximum VCE of 28V. • ±0.3% Linearity Typical The two basic configurations offered include an 8-pin • Ground Referenced Tachometer is Fully device with a ground referenced tachometer input Protected From Damage Due to Swings Above and an internal connection between the tachometer output and the op amp non-inverting input. This VCC and Below Ground version is well suited for single speed or frequency switching or fully buffered frequency to voltage APPLICATIONS conversion applications. • Over/Under Speed Sensing The more versatile configurations provide differential • Frequency to Voltage Conversion tachometer input and uncommitted op amp inputs. (Tachometer) With this version the tachometer input may be floated • Speedometers and the op amp becomes suitable for active filter conditioning of the tachometer output. • Breaker Point Dwell Meters • Hand-Held Tachometer Both of these configurations are available with an active shunt regulator connected across the power • Speed Governors leads. The regulator clamps the supply such that • Cruise Control stable frequency to voltage and frequency to current • Automotive Door Lock Control operations are possible with any supply voltage and a suitable resistor. • Clutch Control • Horn Control • Touch or Sound Switches ADVANTAGES • Output Swings to Ground For Zero Frequency Input • Easy to Use; VOUT = fIN × VCC × R1 × C1 • Only One RC Network provides Frequency Doubling • Zener Regulator on Chip allows Accurate and Stable Frequency to Voltage or Current Conversion (LM2917) 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2000–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
Аналогичный номер детали - LM2907M |
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Аналогичное описание - LM2907M |
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