Absolute Maximum Ratings (Note 4)
Op Amp/Comparator
0.0V to +28V
Power Dissipation (Note 4)
LM2907-8EP, LM2917-8EP
LM2907-14EP, LM2917-14EP
Operating Temperature Range
Storage Temperature Range
Soldering Information
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
1200 mW
1580 mW
Supply Voltage
28V
28V
−40˚C to +85˚C
−65˚C to +150˚C
Collector Voltage
Differential Input Voltage
Tachometer
28V
28V
Dual-In-Line Package
Op Amp/Comparator
Input Voltage Range
Tachometer
Soldering (10 seconds)
Small Outline Package
260˚C
Vapor Phase (60 seconds)
Infrared (15 seconds)
215˚C
220˚C
LM2907-8EP, LM2917-8EP
LM2907EP, LM2917EP
28V
0.0V to +28V
Electrical Characteristics VCC = 12 VDC, TA = 25˚C, see test circuit
Symbol
Parameter
Conditions
Min
Typ
Max
Units
TACHOMETER
@
Input Thresholds
VIN = 250 mVp-p 1 kHz (Note 5)
10
25
30
40
mV
mV
@
VIN = 250 mVp-p 1 kHz (Note 5)
Hysteresis
@
VIN = 250 mVp-p 1 kHz (Note 5)
Offset Voltage
LM2907EP/LM2917EP
LM2907-8EP/LM2917-8EP
Input Bias Current
Pin 2
3.5
5
10
15
1
mV
mV
µA
V
VIN
=
50 mVDC
0.1
8.3
2.3
180
VOH
VOL
I2, I3
I3
VIN = +125 mVDC (Note 6)
VIN = −125 mVDC (Note 6)
V2 = V3 = 6.0V (Note 7)
I2 = 0, V3 = 0
Pin 2
V
Output Current
Leakage Current
Gain Constant
Linearity
140
240
0.1
µA
µA
K
(Note 6)
0.9
1.0
0.3
1.1
fIN = 1 kHz, 5 kHz, 10 kHz (Note 8)
−1.0
+1.0
%
OP/AMP COMPARATOR
VOS
VIN = 6.0V
VIN = 6.0V
3
10
mV
nA
V
IBIAS
50
500
Input Common-Mode Voltage
0
V
CC−1.5V
Voltage Gain
200
50
V/mV
mA
mA
V
Output Sink Current
Output Source Current
Saturation Voltage
VC = 1.0
40
VE = VCC −2.0
ISINK = 5 mA
ISINK = 20 mA
ISINK = 50 mA
10
0.1
0.5
1.0
1.5
V
1.0
V
ZENER REGULATOR
Regulator Voltage
Series Resistance
Temperature Stability
Total Supply Current
RDROP = 470Ω
7.56
10.5
+1
V
Ω
15
6
mV/˚C
mA
3.8
Note 4: 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 LM2907-8EP and LM2917-8EP, and 79˚C/W junction to ambient for LM2907-14EP and LM2917-14EP.
Note 5: Hysteresis is the sum +V − (−V ), offset voltage is their difference. See test circuit.
TH
TH
3
1
4
Note 6: V
is equal to
⁄4
x V
− 1 V , V is equal to
⁄
x V
− 1 V therefore V
− V = V /2. The difference, V
− V , and the mirror gain, I /I ,
OH OL 2 3
OH
CC
BE
OL
CC
BE
OH
OL
CC
are the two factors that cause the tachometer gain constant to vary from 1.0.
Note 7: 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 I x R1. The
3
maximum value for R1 is limited by the output resistance of pin 3 which is greater than 10 MΩ typically.
@
@
@
10 kHz. C1 = 1000 pF,
OUT
Note 8: Nonlinearity is defined as the deviation of V
(
pin 3) for f = 5 kHz from a straight line defined by the V
IN
1 kHz and V
OUT
OUT
R1 = 68k and C2 = 0.22 mFd.
3
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