LM2907-N, LM2917-N
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SNAS555C –JUNE 2000–REVISED MARCH 2013
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
ABSOLUTE MAXIMUM RATINGS(1)(2)
Supply Voltage
28V
25 mA
Supply Current (Zener Options)
Collector Voltage
28V
Differential Input Voltage
Tachometer
28V
Op Amp/Comparator
Tachometer
28V
Input Voltage Range
Power Dissipation
LM2907-8, LM2917-8
LM2907, LM2917
±28V
0.0V to +28V
0.0V to +28V
1200 mW
1580 mW
−40°C to +85°C
−65°C to +150°C
260°C
Op Amp/Comparator
LM2907-8, LM2917-8
LM2907-14, LM2917-14(1)
Operating Temperature Range
Storage Temperature Range
Soldering Information
PDIP Package
SOIC Package
Soldering (10 seconds)
Vapor Phase (60 seconds)
Infrared (15 seconds)
215°C
220°C
(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.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and
specifications.
ELECTRICAL CHARACTERISTICS
VCC = 12 VDC, TA = 25°C, see test circuit
Symbol
Parameter
Conditions
Min
Typ
Max
Units
TACHOMETER
Input Thresholds
Hysteresis
VIN = 250 mVp-p @ 1 kHz(1)
VIN = 250 mVp-p @ 1 kHz(1)
VIN = 250 mVp-p @ 1 kHz(1)
±10
±25
30
±40
mV
mV
Offset Voltage
LM2907/LM2917
LM2907-8/LM2917-8
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
(2)
VOH
VOL
I2, I3
I3
VIN = +125 mVDC
(2)
Pin 2
VIN = −125 mVDC
V
Output Current
Leakage Current
Gain Constant
Linearity
V2 = V3 = 6.0V(3)
140
240
0.1
μA
μA
I2 = 0, V3 = 0
See(2)
fIN = 1 kHz, 5 kHz, 10 kHz(4)
K
0.9
1.0
0.3
1.1
−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
(1) Hysteresis is the sum +VTH − (−VTH), offset voltage is their difference. See test circuit.
(2) VOH is equal to ¾ × VCC − 1 VBE, VOL is equal to ¼ × VCC − 1 VBE 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.
(3) 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 I3 × R1. The maximum value for R1 is limited by the output resistance of pin 3 which is greater than 10 MΩ typically.
(4) Nonlinearity is defined as the deviation of VOUT (@ pin 3) for fIN = 5 kHz from a straight line defined by the VOUT @ 1 kHz and VOUT
10 kHz. C1 = 1000 pF, R1 = 68k and C2 = 0.22 mFd.
@
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