LM2907 datasheet(3/21 Pages) NSC

3 / 21 page

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Supply Voltage

28V

Supply Current (Zener Options)

25 mA

Collector Voltage

28V

Differential Input Voltage

Tachometer

28V

Op Amp/Comparator

28V

Input Voltage Range

Tachometer

LM2907-8, LM2917-8

±28V

LM2907, LM2917

0.0V to +28V

Op Amp/Comparator

0.0V to +28V

Power Dissipation

LM2907-8, LM2917-8

1200 mW

LM2907-14, LM2917-14

1580 mW

See (Note 1)

Operating Temperature Range

−40˚C to +85˚C

Storage Temperature Range

−65˚C to +150˚C

Soldering Information

Dual-In-Line Package

Soldering (10 seconds)

260˚C

Small Outline Package

Vapor Phase (60 seconds)

215˚C

Infrared (15 seconds)

220˚C

See AN-450 “Surface Mounting Methods and Their Effect

on Product Reliability” for other methods of soldering

surface mount devices.

Electrical Characteristics

CC =12 VDC,TA = 25˚C, see test circuit

Symbol

Parameter

Conditions

Min

Typ

Max

Units

TACHOMETER

Input Thresholds

IN = 250 mVp-p @ 1 kHz (Note 2)

±10

±25

±40

Hysteresis

IN = 250 mVp-p @ 1 kHz (Note 2)

Offset Voltage

IN = 250 mVp-p @ 1 kHz (Note 2)

LM2907/LM2917

3.5

LM2907-8/LM2917-8

Input Bias Current

IN = ±50 mVDC

0.1

µA

Pin 2

IN = +125 mVDC (Note 3)

8.3

Pin 2

IN = −125 mVDC (Note 3)

2.3

2,I3

Output Current

V2 = V3 = 6.0V (Note 4)

140

180

240

µA

Leakage Current

I2 = 0, V3 = 0

0.1

µA

Gain Constant

(Note 3)

0.9

1.0

1.1

Linearity

IN = 1 kHz, 5 kHz, 10 kHz (Note 5)

−1.0

0.3

+1.0

OP/AMP COMPARATOR

IN = 6.0V

BIAS

IN = 6.0V

500

Input Common-Mode Voltage

CC−1.5V

Voltage Gain

200

V/mV

Output Sink Current

C = 1.0

Output Source Current

E =VCC −2.0

Saturation Voltage

SINK = 5 mA

0.1

0.5

SINK = 20 mA

1.0

SINK = 50 mA

1.0

1.5

ZENER REGULATOR

Regulator Voltage

DROP = 470

Ω

7.56

Series Resistance

10.5

Ω

Temperature Stability

mV/˚C

TOTAL SUPPLY CURRENT

3.8

Note 1: For operation in ambient temperatures above 25˚C, the device must be derated based on a 150˚C maximum junction temperature and a thermal resistance

of 101˚C/W junction to ambient for LM2907-8 and LM2917-8, and 79˚C/W junction to ambient for LM2907-14 and LM2917-14.

Note 2: Hysteresis is the sum +VTH − (−VTH), offset voltage is their difference. See test circuit.

Note 3: VOH is equal to 3⁄4 xVCC −1VBE,VOL is equal to 1⁄4 xVCC −1VBE therefore VOH −VOL =VCC/2. The difference, VOH −VOL, and the mirror gain, I2/I3,

are the two factors that cause the tachometer gain constant to vary from 1.0.

Note 4: Be sure when choosing the time constant R1 x C1 that R1 is such that the maximum anticipated output voltage at pin 3 can be reached with I3 x R1. The

maximum value for R1 is limited by the output resistance of pin 3 which is greater than 10 M

Ω typically.

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