Data Sheet

ManualsBrandsUnbranded ManualsActive ComponentsLM2917M-8/NOPB PMIC - F/V converters FVC 10 kHz SOIC 8

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

FEATURES

DESCRIPTION

The LM2907, LM2917 series are monolithic

• 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 V

up to a maximum V

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

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; V

OUT

= f

× V

× R1 × C1

• Only One RC Network provides Frequency

Doubling

• Zener Regulator on Chip allows Accurate and

Stable Frequency to Voltage or Current

Conversion (LM2917)

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.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (32 pages)

PAGE 1
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 FEATURES DESCRIPTION • The LM2907, LM2917 series are monolithic frequency to voltage converters with a high gain op amp/comparator designed to operate a relay, lamp, or other load when the input frequency reaches or exceeds a selected rate.
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LM2907-N, LM2917-N SNAS555C – JUNE 2000 – REVISED MARCH 2013 www.ti.com CONNECTION DIAGRAMS PDIP and SOIC Packages, Top Views 2 Figure 1. See Package Number D0008A or P0008E Figure 2. See Package Number D0008A or P0008E Figure 3. See Package Number D0014A or NFF0014A Figure 4.
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LM2907-N, LM2917-N www.ti.com SNAS555C – JUNE 2000 – REVISED MARCH 2013 These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
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LM2907-N, LM2917-N SNAS555C – JUNE 2000 – REVISED MARCH 2013 www.ti.com ELECTRICAL CHARACTERISTICS (continued) VCC = 12 VDC, TA = 25°C, see test circuit Symbol Parameter Conditions Min Voltage Gain 40 Typ Max Units 200 V/mV 50 mA Output Sink Current VC = 1.0 Output Source Current VE = VCC −2.0 10 Saturation Voltage ISINK = 5 mA 0.1 ISINK = 20 mA ISINK = 50 mA 1.0 RDROP = 470Ω 7.56 mA 0.5 V 1.0 V 1.5 V 15 Ω ZENER REGULATOR Regulator Voltage Series Resistance 10.
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LM2907-N, LM2917-N www.ti.com SNAS555C – JUNE 2000 – REVISED MARCH 2013 Tachometer Input Threshold Measurement Figure 6.
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LM2907-N, LM2917-N SNAS555C – JUNE 2000 – REVISED MARCH 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS 6 Tachometer Linearity vs Temperature Tachometer Linearity vs Temperature Figure 7. Figure 8. Total Supply Current Zener Voltage vs Temperature Figure 9. Figure 10. Normalized Tachometer Output (K) vs Temperature Normalized Tachometer Output (K) vs Temperature Figure 11. Figure 12.
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LM2907-N, LM2917-N www.ti.com SNAS555C – JUNE 2000 – REVISED MARCH 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Tachometer Currents I2and I3 vs Supply Voltage Tachometer Currents I2and I3 vs Temperature Figure 13. Figure 14. Tachometer Linearity vs R1 Tachometer Input Hysteresis vs Temperature Figure 15. Figure 16. Op Amp Output Transistor Characteristics Op Amp Output Transistor Characteristics Figure 17. Figure 18.
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LM2907-N, LM2917-N SNAS555C – JUNE 2000 – REVISED MARCH 2013 www.ti.com APPLICATIONS INFORMATION The LM2907 series of tachometer circuits is designed for minimum external part count applications and maximum versatility. In order to fully exploit its features and advantages let's examine its theory of operation. The first stage of operation is a differential amplifier driving a positive feedback flip-flop circuit.
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LM2907-N, LM2917-N www.ti.com SNAS555C – JUNE 2000 – REVISED MARCH 2013 USING ZENER REGULATED OPTIONS (LM2917) For those applications where an output voltage or current must be obtained independent of supply voltage variations, the LM2917 is offered. The most important consideration in choosing a dropping resistor from the unregulated supply to the device is that the tachometer and op amp circuitry alone require about 3 mA at the voltage level provided by the zener.
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LM2907-N, LM2917-N SNAS555C – JUNE 2000 – REVISED MARCH 2013 www.ti.com Figure 21. Zener Regulated Frequency to Voltage Converter Figure 22.
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LM2907-N, LM2917-N www.ti.com SNAS555C – JUNE 2000 – REVISED MARCH 2013 Figure 23. Voltage Driven Meter Indicating Engine RPM VO = 6V @ 400 Hz or 6000 ERPM (8 Cylinder Engine) Figure 24.
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LM2907-N, LM2917-N SNAS555C – JUNE 2000 – REVISED MARCH 2013 www.ti.com Figure 25. Capacitance Meter VOUT = 1V–10V for CX = 0.01 to 0.1 mFd (R = 111k) Figure 26.
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LM2907-N, LM2917-N www.ti.com SNAS555C – JUNE 2000 – REVISED MARCH 2013 Figure 27. 100 Cycle Delay Switch Variable Reluctance Magnetic Pickup Buffer Circuits Precision two-shot output frequency equals twice input frequency. Pulse height = VZENER Figure 28. Figure 29.
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LM2907-N, LM2917-N SNAS555C – JUNE 2000 – REVISED MARCH 2013 www.ti.com Finger Touch or Contact Switch Figure 30. Figure 31. Flashing begins when fIN ≥ 100 Hz. Flash rate increases with input frequency increase beyond trip point. Figure 32.
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LM2907-N, LM2917-N www.ti.com SNAS555C – JUNE 2000 – REVISED MARCH 2013 Figure 33. Frequency to Voltage Converter with 2 Pole Butterworth Filter to Reduce Ripple Figure 34. Overspeed Latch Figure 36. Figure 35.
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LM2907-N, LM2917-N SNAS555C – JUNE 2000 – REVISED MARCH 2013 www.ti.com Frequency Switch Applications Some frequency switch applications may require hysteresis in the comparator function which can be implemented in several ways. Figure 37.
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LM2907-N, LM2917-N www.ti.com SNAS555C – JUNE 2000 – REVISED MARCH 2013 Figure 38. Figure 39. Figure 40. Figure 41.
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LM2907-N, LM2917-N SNAS555C – JUNE 2000 – REVISED MARCH 2013 www.ti.com Changing the Output Voltage for an Input Frequency of Zero Figure 42. Figure 43. Changing Tachometer Gain Curve or Clamping the Minimum Output Voltage Figure 44. 18 Submit Documentation Feedback Figure 45.
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LM2907-N, LM2917-N www.ti.com SNAS555C – JUNE 2000 – REVISED MARCH 2013 ANTI-SKID CIRCUIT FUNCTIONS “Select-Low” Circuit VOUT Proportional to the Lower of the Two Input Wheel Speeds Figure 46. Figure 47. “Select-High” Circuit VOUT Proportional to the Higher of the Two Input Wheel Speeds Figure 48. Figure 49.
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LM2907-N, LM2917-N SNAS555C – JUNE 2000 – REVISED MARCH 2013 www.ti.com “Select-Average” Circuit Figure 50.
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LM2907-N, LM2917-N www.ti.com SNAS555C – JUNE 2000 – REVISED MARCH 2013 EQUIVALENT SCHEMATIC DIAGRAM *This connection made on LM2907-8 and LM2917-8 only. **This connection made on LM2917 and LM2917-8 only. Figure 51.
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LM2907-N, LM2917-N SNAS555C – JUNE 2000 – REVISED MARCH 2013 www.ti.com REVISION HISTORY Changes from Revision B (March 2013) to Revision C • 22 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing LM2907MX SOIC D LM2907MX-8/NOPB SOIC LM2907MX/NOPB SOIC LM2917MX-8 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 9.35 2.3 8.0 16.0 Q1 14 2500 330.0 16.4 6.5 D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1 D 14 2500 330.0 16.4 6.5 9.35 2.3 8.0 16.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM2907MX SOIC D 14 2500 367.0 367.0 35.0 LM2907MX-8/NOPB SOIC D 8 2500 367.0 367.0 35.0 LM2907MX/NOPB SOIC D 14 2500 367.0 367.0 35.0 LM2917MX-8 SOIC D 8 2500 367.0 367.0 35.0 LM2917MX-8/NOPB SOIC D 8 2500 367.0 367.0 35.0 LM2917MX/NOPB SOIC D 14 2500 367.0 367.0 35.
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MECHANICAL DATA NFF0014A N0014A N14A (Rev G) www.ti.
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