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LM2907N PDIP (N)-14,PDIP (P)-8,SOIC (D)-14,SOIC (D)-8

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LM2907N

Frequency-to-voltage converter for ground or supply referred load up to 50 mA

Manufacturer:

Texas Instruments
Mfr.Part #:

LM2907N
Datasheet:

LM2907N Datasheet (PDF)
Vs (min) (V):

6
Vs (max) (V):

28
Operating temperature range (°C):

-40 to 85
Rating:

Catalog
EDA/CAD Models:

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LM2907N General Description

The LM2907 and LM2917 devices are monolithic frequency-to-voltage converters with a high gain op amp designed to operate a relay, lamp, or other load when the input frequency reaches or exceeds a selected rate. The tachometer uses a charge pump technique and offers frequency doubling for low-ripple, full-input protection in two versions (8-pin LM2907 and LM2917), and its output swings to ground for a zero frequency input.

The op amp is fully compatible with the tachometer and has a floating transistor as its output. This feature allows either a ground or supply referred load of up to 50 mA. The collector may be taken above V_CC up to a maximum V_CE of 28 V.

The two basic configurations offered include an 8-pin device with a input and an internal connection between the tachometer output and the op amp noninverting input. This version is well suited for single speed or frequency switching or fully buffered frequency-to-voltage conversion applications.

The more versatile configurations provide differential tachometer input and uncommitted op amp inputs. With this version the tachometer input may be floated and the op amp becomes suitable for active filter conditioning of the tachometer output.

Both of these configurations are available with an active shunt regulator connected across the power leads. The regulator clamps the supply such that stable frequency-to-voltage and frequency-to-current operations are possible with any supply voltage and a suitable resistor.

Key Features

Ground Referenced Tachometer Input Interfaces Directly With Variable Reluctance Magnetic Pickups
Op Amp Has Floating Transistor Output
50-mA Sink or Source to Operate Relays, Solenoids, Meters, or LEDs
Frequency Doubling For Low Ripple
Tachometer Has Built-In Hysteresis With Either Differential Input or Ground Referenced Input
±0.3% Linearity (Typical)
Ground-Referenced Tachometer is Fully Protected From Damage Due to Swings Above V_CC and Below Ground
Output Swings to Ground For Zero Frequency Input
Easy to Use×V_OUT = f_IN × V_CC × R1 × C1
Zener Regulator on Chip allows Accurate and Stable Frequency to Voltage or Current Conversion (LM2917)