參數(shù)資料
型號： LM2907N-8
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 模擬專用變換器
英文描述： LM2907/LM2917 Frequency to Voltage Converter
中文描述： VOLTAGE-FREQUENCY CONVERTER, PDIP8
封裝： PLASTIC, DIP-8
文件頁數(shù)： 3/21頁
文件大?。?/td> 712K
代理商： LM2907N-8
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
(Note 1)
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
Op Amp/Comparator
28V
25 mA
28V
28V
28V
±
28V
0.0V to +28V
0.0V to +28V
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)
See AN-450 “Surface Mounting Methods and Their Effect
on Product Reliability” for other methods of soldering
surface mount devices.
1200 mW
1580 mW
40C to +85C
65C to +150C
260C
215C
220C
Electrical Characteristics
V
CC
= 12 V
DC
, T
A
= 25C, see test circuit
Symbol
Parameter
TACHOMETER
Input Thresholds
Hysteresis
Offset Voltage
LM2907/LM2917
LM2907-8/LM2917-8
Input Bias Current
V
OH
Pin 2
V
OL
Pin 2
I
2
, I
3
Output Current
I
3
Leakage Current
K
Gain Constant
Linearity
OP/AMP COMPARATOR
V
OS
I
BIAS
Input Common-Mode Voltage
Voltage Gain
Output Sink Current
Output Source Current
Saturation Voltage
Conditions
Min
Typ
Max
Units
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)
±
10
±
25
30
±
40
mV
mV
3.5
5
0.1
8.3
2.3
180
10
15
1
mV
mV
μA
V
V
μA
μA
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)
140
240
0.1
1.1
+1.0
0.9
1.0
1.0
0.3
%
V
IN
= 6.0V
V
IN
= 6.0V
3
50
10
500
mV
nA
V
V/mV
mA
mA
V
V
V
0
V
CC
1.5V
200
50
10
0.1
V
C
= 1.0
V
E
= V
CC
2.0
I
SINK
= 5 mA
I
SINK
= 20 mA
I
SINK
= 50 mA
40
0.5
1.0
1.5
1.0
ZENER REGULATOR
Regulator Voltage
Series Resistance
Temperature Stability
TOTAL SUPPLY CURRENT
R
DROP
= 470
7.56
10.5
+1
3.8
V
15
mV/C
mA
6
Note 1:
For operation in ambient temperatures above 25C, the device must be derated based on a 150C maximum junction temperature and a thermal resistance
of 101C/W junction to ambient for LM2907-8 and LM2917-8, and 79C/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
is equal to
3
4
x V
1 V
, V
is equal to
1
4
x V
1 V
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 x C1 that R1 is such that the maximum anticipated output voltage at pin 3 can be reached with I
3
x R1. The
maximum value for R1 is limited by the output resistance of pin 3 which is greater than 10 M
typically.
L
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