LM2907/LM2917
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
Supply Current (Zener Options)
Collector Voltage
Differential Input Voltage
Tachometer
Op Amp/Comparator
Input Voltage Range
Tachometer
LM2907-8, LM2917-8
LM2907, LM2917
28V
25 mA
28V
28V
28V
±28V
0.0V to +28V
Op Amp/Comparator
Power Dissipation
LM2907-8, LM2917-8
LM2907-14, LM2917-14
See (Note 1)
Operating Temperature Range
Storage Temperature Range
Soldering Information
Dual-In-Line Package
Soldering (10 seconds)
Small Outline Package
Vapor Phase (60 seconds)
Infrared (15 seconds)
0.0V to +28V
1200 mW
1580 mW
−40°C to +85°C
−65°C to +150°C
260°C
215°C
220°C
Electrical Characteristics
V
CC
= 12 V
DC
, T
A
= 25°C, see test circuit
Symbol
TACHOMETER
Input Thresholds
Hysteresis
Offset Voltage
LM2907/LM2917
LM2907-8/LM2917-8
Input Bias Current
V
OH
V
OL
I
2
, I
3
I
3
K
Pin 2
Pin 2
Output Current
Leakage Current
Gain Constant
Linearity
OP/AMP COMPARATOR
V
OS
I
BIAS
Input Common-Mode Voltage
Voltage Gain
Output Sink Current
Output Source Current
Saturation Voltage
V
C
= 1.0
V
E
= V
CC
−2.0
I
SINK
= 5 mA
I
SINK
= 20 mA
I
SINK
= 50 mA
ZENER REGULATOR
Regulator Voltage
Series Resistance
Temperature Stability
Total Supply Current
R
DROP
= 470Ω
7.56
10.5
+1
3.8
6
15
V
Ω
mV/°C
mA
1.0
40
V
IN
= 6.0V
V
IN
= 6.0V
0
200
50
10
0.1
0.5
1.0
1.5
3
50
10
500
V
CC
−1.5V
mV
nA
V
V/mV
mA
mA
V
V
V
V
IN
= ±50 mV
DC
V
IN
= +125 mV
DC
(Note 3)
V
IN
= −125 mV
DC
(Note 3)
V2 = V3 = 6.0V (Note 4)
I2 = 0, V3 = 0
(Note 3)
f
IN
= 1 kHz, 5 kHz, 10 kHz (Note 5)
0.9
−1.0
1.0
0.3
140
V
IN
= 250 mVp-p @ 1 kHz (Note 2)
V
IN
= 250 mVp-p @ 1 kHz (Note 2)
V
IN
= 250 mVp-p @ 1 kHz (Note 2)
3.5
5
0.1
8.3
2.3
180
240
0.1
1.1
+1.0
%
10
15
1
mV
mV
μA
V
V
μA
μA
±10
±25
30
±40
mV
mV
Parameter
Conditions
Min
Typ
Max
Units
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 +V
TH
− (−V
TH
), offset voltage is their difference. See test circuit.
Note 3:
V
OH
is equal to ¾ × V
CC
− 1 V
BE
, V
OL
is equal to ¼ × V
CC
− 1 V
BE
therefore V
OH
− V
OL
= V
CC
/2. The difference, V
OH
− V
OL
, and the mirror gain, I
2
/I
3
, 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 × C1 that R1 is such that the maximum anticipated output voltage at pin 3 can be reached with I
3
× R1. The
maximum value for R1 is limited by the output resistance of pin 3 which is greater than 10 MΩ typically.
3
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