Datasheet

LM2907-N, LM2917-N
www.ti.com 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
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
(1)
1580 mW
Operating Temperature Range −40°C to +85°C
Storage Temperature Range −65°C to +150°C
Soldering Information PDIP Package Soldering (10 seconds) 260°C
SOIC Package Vapor Phase (60 seconds) 215°C
Infrared (15 seconds) 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
V
CC
= 12 V
DC
, T
A
= 25°C, see test circuit
Symbol Parameter Conditions Min Typ Max Units
TACHOMETER
Input Thresholds V
IN
= 250 mVp-p @ 1 kHz
(1)
±10 ±25 ±40 mV
Hysteresis V
IN
= 250 mVp-p @ 1 kHz
(1)
30 mV
Offset Voltage V
IN
= 250 mVp-p @ 1 kHz
(1)
LM2907/LM2917 3.5 10 mV
LM2907-8/LM2917-8 5 15 mV
Input Bias Current V
IN
= ±50 mV
DC
0.1 1 μA
V
OH
Pin 2 V
IN
= +125 mV
DC
(2)
8.3 V
V
OL
Pin 2 V
IN
= −125 mV
DC
(2)
2.3 V
I
2
, I
3
Output Current V2 = V3 = 6.0V
(3)
140 180 240 μA
I
3
Leakage Current I2 = 0, V3 = 0 0.1 μA
K Gain Constant See
(2)
0.9 1.0 1.1
Linearity f
IN
= 1 kHz, 5 kHz, 10 kHz
(4)
−1.0 0.3 +1.0 %
OP/AMP COMPARATOR
V
OS
V
IN
= 6.0V 3 10 mV
I
BIAS
V
IN
= 6.0V 50 500 nA
Input Common-Mode 0 V
CC
−1.5V V
Voltage
(1) Hysteresis is the sum +V
TH
− (−V
TH
), offset voltage is their difference. See test circuit.
(2) 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.
(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 I
3
× 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 V
OUT
(@ pin 3) for f
IN
= 5 kHz from a straight line defined by the V
OUT
@ 1 kHz and V
OUT
@
10 kHz. C1 = 1000 pF, R1 = 68k and C2 = 0.22 mFd.
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