LM2907MSLASHNOPB datasheet(3/44 Pages) TI2

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TACH+

TACH±/GND

CP1

IN±

CP2/IN+

V+

EMIT

COL

Not to scale

LM2907-N, LM2917-N

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SNAS555D – JUNE 2000 – REVISED DECEMBER 2016

Product Folder Links: LM2907-N LM2917-N

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5 Description (continued)

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.

6 Pin Configuration and Functions

P and D Package

8-Pin PDIP and SOIC

Top View

Pin Functions: 8 Pins

I/O

DESCRIPTION

NAME

NO.

COL

The collector of the bipolar junction transistor

CP1

A capacitor placed on this pin will be charged up to VCC/2 by a constant current source of 180 µA

typical at the start of every positive half cycle. At the beginning of negative half cycles this capacitor

is discharged the same amount at the same rate.

CP2/IN+

I/O

See pins CP1 and IN+. On 8-pin devices (8-pin LM2907 and LM2917) these two nodes share a pin

and are internally connected.

EMIT

The emitter of the bipolar junction transistor

GND

—

Ground

IN+

—

The noninverting input to the high gain op amp

IN–

The inverting input to the high gain op amp

—

No connect

TACH+

Positive terminal for the input signal that leads to the noninverting terminal of the internal Schmitt-

Trigger comparator.

TACH–/GND

Negative terminal for the input signal that leads to the noninverting terminal of the internal Schmitt-

Trigger comparator. (NOTE: On 8-pin devices, LM2907 and LM2917, this pin is internally connected

to ground and must be tied to ground externally to provide the reference voltage of the device).

V+

Supply voltage

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