LM2907MDC【PDF 15/26 页】VOLTAGE-FREQUENCY CONVERTER, UUC

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National P/N LM2907 - Frequency to Voltage Converter

LM2907 MDC

Die

Full

production

N/A

N/A Samples

tray

N/A

LM2907 MWC

Wafer

Full

production

N/A

wafer

jar

N/A

General 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. The tachometer 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.

The op amp/comparator 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

VCC up to a maximum VCE of 28V.

The two basic configurations offered include an 8-pin device with a ground referenced tachometer input and

an internal connection between the tachometer output and the op amp non-inverting 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.

Features

Ground referenced tachometer input interfaces directly with variable reluctance magnetic pickups

Op amp/comparator 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

Built-in zener on LM2917

±0.3% linearity typical

Ground referenced tachometer is fully protected from damage due to swings above VCC and below

ground

Applications

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