LM2907EP [TI]
LM2907EP / LM2917EP Enhanced Plastic Frequency to Voltage Converter; LM2907EP / LM2917EP增强塑料频率电压转换器
| 型号： | LM2907EP |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | LM2907EP / LM2917EP Enhanced Plastic Frequency to Voltage Converter |
| 文件： | 总26页 (文件大小：667K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LM2907EP,LM2917EP
LM2907EP / LM2917EP Enhanced Plastic Frequency to Voltage Converter
Literature Number: SNOSAB0A
OBSOLETE
September 23, 2011
LM2907EP/LM2917EP
Enhanced Plastic Frequency to Voltage Converter
General Description
Features
The LM2907EP, LP2917EP series are monolithic frequency
to voltage converters with a high gain op amp/comparator
designed to operate a relay, lamp, or other load when the in-
put frequency reaches or exceeds a selected rate. The
tachometer uses a charge pump technique and offers fre-
quency doubling for low ripple, full input protection in two
versions (LM2907-8EP, LM2917-8EP) and its output swings
to ground for a zero frequency input.
Ground referenced tachometer input interfaces directly
■
with variable reluctance magnetic pickups
Op amp/comparator has floating transistor output
■
■
50 mA sink or source to operate relays, solenoids, meters,
or LEDs
Frequency doubling for low ripple
■
■
Tachometer has built-in hysteresis with either differential
input or ground rerenced input
The op amp/comparator is fully compatible with the tachome-
ter and has a floating transistor as its output. This feature
allows either a ground or supply referred load of up to 50 mA.
The collector may be taken above VCC up to a maximum
VCE of 28V.
Built-in zener oM297EP
■
■
■
±0.3% linearitc
Ground reenced oter is fully protected from
damage to swings ove VCC and below ground
The two basic configurations offered include an 8-pin device
with a ground referenced tachometer input and an internal
connection between the tachometer output and the op amp
non-inverting input. This version is well suited for single speed
or frequency switching or fully buffered frequency to voltage
conversion applications.
Advantage
Oput swings to ground for zero frequency input
■
■
■
■
sy use; VOUT = fIN × VCC × R1 × C1
One Rnetwork provides frequency doubling
Zener rator on chip allows accurate and stable
frequency to voltage or current conversion (LM2917EP)
The more versatile configurations provide differential
tachometer input and uncommitted op amp inputs. With thi
version the tachometer input may be floated and the op amp
becomes suitable for active filter conditioning of the tachome-
ter output.
Aications
Selected Military Applications
■
Both of these configurations are available with an act
regulator connected across the power leads. The
clamps the supply such that stable frequency to volta
frequency to current operations are possible th any supply
voltage and a suitable resistor.
Selected Avionics Applications
ENHANCED PLASTIC
•
•
•
•
•
•
Extended Temperature Performanc−40°C to 5°C
Baseline Control - Single Fab & ly ite
Process Change Notification (P
Qualification & Reliability Data
Solder (PbSn) Lead Finisdard
Enhanced Diminishing g Sources (DMS)
Support
Ordering Information
Part Number
VIN Part Number
V62/04635-01
V62/04635-02
TBD
NS Package Number (Note 3)
LM2907MX-8EP
LM2917MXEP
(Note 1, Note 2)
M08A
M14A
TBD
Note 1: For the following (Enhanced Plastic) versions, check for availablility: LM2907M-8EP, LM2907MEP, LM2907MXEP, LM2907N-8EP,
LM2907NEP and LM2917M-8EP, LM2917MX-8EP, LM2917MEP, LM2917N-8EP, LM2917NEP. Parts listed with an "X" are provided in Tape & Reel
and parts without an "X" are in Rails.
Note 2: FOR ADDITIONAL ORDERING AND PRODUCT INFORMATION, PLEASE VISIT THE ENHANCED PLASTIC WEB SITE AT: www.national.com/
mil
Note 3: Refer to package details under Physical Dimensions
© 2011 National Semiconductor Corporation
200906
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200906 Version 2 Revision 5 Print Date/Time: 2011/09/23 13:48:46
Block and Connection Diagrams
Dual-In-Line and Small Outline Packages, Top Views
20090601
20090602
LM2907-8
LM2917-8
See NS Package Number M08A or N08E
See NS kage Number M08A or N08E
20090603
20090604
LM2907
LM2917
See NS Package Number M1414A
See NS Package Number M14A or N14A
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200906 Version 2 Revision 5 Print Date/Time: 2011/09/23 13:48:46
Op Amp/Comparator
Power Dissipation (Note 4)
LM2907-8EP, LM2917-8EP
LM2907-14EP, LM2917-14EP
Operating Temperature Range
Storage Temperature Range
Soldering Information
Dual-In-Line Package
Soldering (10 seconds)
Small Outline Package
0.0V to +28V
Absolute Maximum Ratings (Note 4)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
1200 mW
1580 mW
−40°C to +85°C
−65°C to +150°C
Supply Voltage
Collector Voltage
28V
28V
Differential Input Voltage
Tachometer
Op Amp/Comparator
Input Voltage Range
Tachometer
28V
28V
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
in
Typ
Max
Units
TACHOMETER
Input Thresholds
VIN = 250 mVp-p @ 1 kHz (Note 5)
VIN = 250 mVp-p @ 1 kHz (Note
VIN = 250 mVp-p @ 1 kHz (Note 5)
±25
30
±40
mV
mV
Hysteresis
Offset Voltage
LM2907EP/LM2917EP
LM2907-8EP/LM2917-8EP
Input Bias Current
3.5
5
10
15
1
mV
mV
VIN = ±50 mVDC
0.1
μA
V
VOH
VOL
I2, I3
I3
Pin 2
VIN = +125 mVDC (Note 6)
VIN = −125 mVDC (6)
V2 = V3 = 6.0V (Note 7
I2 = 0, V3
8.3
2.3
Pin 2
V
Output Current
Leakage Current
Gain Constant
Linearity
140
180
240
0.1
μA
μA
K
(Note 6)
0.9
1.0
0.3
1.1
fIN = 1 kHzHz (Note 8)
−1.0
+1.0
%
OP/AMP COMPARATOR
VOS
V6
VIN = 6.0V
3
10
500
mV
nA
V
IBIAS
50
Input Common-Mode Voltag
0
VCC−1.5V
Voltage Gain
200
50
V/mV
mA
mA
V
Output Sink Current
Output Source Curr
Saturation Voltage
.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
7.56
V
RDROP = 470Ω
Series Resistance
10.5
+1
15
6
Ω
mV/°C
Temperature Stability
Total Supply Current
3.8
mA
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 +VTH − (−VTH), offset voltage is their difference. See test circuit.
Note 6: 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.
Note 7: 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.
Note 8: 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.
3
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200906 Version 2 Revision 5 Print Date/Time: 2011/09/23 13:48:46
Test Circuit and Waveform
20090606
Tachometer IeshoMeasurement
20090607
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Typical Performance Characteristics
Total Supply Current
Zener Voltage vs
Temperature
20090640
20090641
Normalized Tachometer
Output vs Temperature
Normalizd Tachometer
Output vs Temperature
20090643
9
Tachometer Currents I
and I3 vs Supply V
Tachometer Currents I2
and I3 vs Temperature
20090644
20090645
5
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200906 Version 2 Revision 5 Print Date/Time: 2011/09/23 13:48:46
Tachometer Linearity
vs Temperature
Tachometer Linearity
vs Temperature
20090647
20090646
Tachometer Linearity vs R1
TameInput Hysteresis
emature
20090648
20090649
Op Amp Output Transistor
Characteristics
Op Amp Output Transistor
Characteristics
20090651
20090650
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6
200906 Version 2 Revision 5 Print Date/Time: 2011/09/23 13:48:46
The size of C2 is dependent only on the amount of ripple volt-
age allowable and the required response time.
Applications Information
The LM2907EP series of tachometer circuits is designed for
minimum external part count applications and maximum ver-
satility. In order to fully exploit its features and advantages
let's examine its theory of operation. The first stage of oper-
ation is a differential amplifier driving a positive feedback flip-
flop circuit. The input threshold voltage is the amount of
differential input voltage at which the output of this stage
changes state. Two options (LM2907-8EP, LM2917-8EP)
have one input internally grounded so that an input signal
must swing above and below ground and exceed the input
thresholds to produce an output. This is offered specifically
for magnetic variable reluctance pickups which typically pro-
vide a single-ended ac output. This single input is also fully
protected against voltage swings to ±28V, which are easily
attained with these types of pickups.
CHOOSING R1 AND C1
There are some limitations on the choice of R1 and C1 which
should be considered for optimum performance. The timing
capacitor also provides internal compensation for the charge
pump and should be kept larger than 500 pF for very accurate
operation. Smaller values can cause an error current on R1,
especially at low temperatures. Several considerations must
be met when choosing R1. The output current at pin 3 is in-
ternally fixed and therefore VO/R1 must be less than or equal
to this value. If R1 is too large, it can become a significant
fraction of the output impedance at pin 3 which degrades lin-
earity. Also output ripple voltage must be considered and the
size of C2 is affected by R1. An expression that describes the
ripple content on pin 3 for a single R1C2 combination is:
The differential input options (LM2907EP, LM2917EP) give
the user the option of setting his own input switching level and
still have the hysteresis around that level for excellent noise
rejection in any application. Of course in order to allow the
inputs to attain common-mode voltages above ground, input
protection is removed and neither input should be taken out-
side the limits of the supply voltage being used. It is very
important that an input not go below ground without some re-
sistance in its lead to limit the current that will then flow in the
epi-substrate diode.
It appearcan be choen independent of ripple, however
respontimr the time it takes VOUT to stabilize at a new
voltage increasethe size of C2 increases, so a compro-
misbetween rippl, response time, and linearity must be
cen efully.
As l coderation, the maximum attainable input fre-
quencrmined by VCC, C1 and I2:
Following the input stage is the charge pump where the input
frequency is converted to a dc voltage. To do this requires
one timing capacitor, one output resistor, and an integrating
or filter capacitor. When the input stage changes state (due
to a suitable zero crossing or differential voltage on the input)
the timing capacitor is either charged or discharged lin
between two voltages whose difference is VCC/2. Then
half cycle of the input frequency or a time equal to 1/2
change in charge on the timing capacitor is equal to V
C1. The average amount of current pumped into r out of
capacitor then is:
USING ZENER REGULATED OPTIONS (LM2917EP)
For those applications where an output voltage or current
must be obtained independent of supply voltage variations,
the LM2917EP is offered. The most important consideration
in choosing a dropping resistor from the unregulated supply
to the device is that the tachometer and op amp circuitry alone
require about 3 mA at the voltage level provided by the zener.
At low supply voltages there must be some current flowing in
the resistor above the 3 mA circuit current to operate the reg-
ulator. As an example, if the raw supply varies from 9V to 16V,
a resistance of 470Ω will minimize the zener voltage variation
to 160 mV. If the resistance goes under 400Ω or over 600Ω
the zener variation quickly rises above 200 mV for the same
input variation.
The output circuit mirrors this current y into the
load resistor R1, connected to ground, suthe pulses
of current are integrated with a pacitoen VO = ic ×
R1, and the total conversion omes:
VO = VCC × K
Where K is the gain constant—1.0.
7
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200906 Version 2 Revision 5 Print Date/Time: 2011/09/23 13:48:46
Typical Applications
Minimum Component Tachometer
20090608
20090609
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8
200906 Version 2 Revision 5 Print Date/Time: 2011/09/23 13:48:46
Zener Regulated Frequency to Voltage Converter
20090610
Breaker PDwell Meter
20090611
9
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200906 Version 2 Revision 5 Print Date/Time: 2011/09/23 13:48:46
Voltage Driven Meter Indicating Engine RPM
VO = 6V @ 400 Hz or 6000 ERPM (8 Cylinder Engine)
20090612
Current Driven Meter IndicatEngine RPM
IO = 10 mA @ 300 Hz or 6000 ER(6 linder Engine)
20090613
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200906 Version 2 Revision 5 Print Date/Time: 2011/09/23 13:48:46
Capacitance Meter
VOUT = 1V–10V for CX = 0.01 to 0.1 mFd
(R = 111k)
20090614
Two-Wire Remote Spitch
20090615
11
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200906 Version 2 Revision 5 Print Date/Time: 2011/09/23 13:48:46
100 Cycle Delay Switch
20090616
Variable Reluctance Magnetic Pickup Buffer C
20090617
20090639
Precision two-shot output frequency
equals twice input frequency.
Pulse height = VZENER
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12
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Finger Touch or Contact Switch
20090619
20090618
Flashing LED Indicates Oversd
20090620
Flashing begins when fIN ≥ 100 Hz.
Flash rate increases with input frequency
increase beyond trip point.
13
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200906 Version 2 Revision 5 Print Date/Time: 2011/09/23 13:48:46
Frequency to Voltage Converter with 2 Pole Butterworth Filter to Reduce Ripple
20090621
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14
200906 Version 2 Revision 5 Print Date/Time: 2011/09/23 13:48:46
Overspeed Latch
20090623
20090622
Some Frequency Switch Applications equire Hysteresis in the
Comparator Function Whe Impmented in Several Ways:
20090624
15
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200906 Version 2 Revision 5 Print Date/Time: 2011/09/23 13:48:46
20090625
20090626
20090628
627
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200906 Version 2 Revision 5 Print Date/Time: 2011/09/23 13:48:46
Changing the Output Voltage for an Input Frequency of Zero
20090630
20090629
Changing Tachometer Gain Curve or Clamping the Minimum
Output Voltage
20090632
20090631
17
200906 Version 2 Revision 5 Print Date/Time: 2011/09/23 13:48:46
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Anti-Skid Circuit Functions
“Select-Low” Circuit
20090633
20090634
VOUT is proportional to the lower of the two i
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200906 Version 2 Revision 5 Print Date/Time: 2011/09/23 13:48:46
“Select-High” Circuit
20090635
20090636
VOUT is proportional to the higher of the two input wheel eds.
“Sect-Average” Circuit
20090637
19
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200906 Version 2 Revision 5 Print Date/Time: 2011/09/23 13:48:46
Equivalent Schematic Diagram
20090638
*This connection made on LM29077-8EP only.
**This connection made on LM2918EP only.
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200906 Version 2 Revision 5 Print Date/Time: 2011/09/23 13:48:46
Physical Dimensions inches (millimeters) unless otherwise noted
8-Lead (0.150″ Wide) Molded Small Outlickage, JEDEC
NS PackagNumber M08A
14-Lead Molded SO Package
NS Package Number M14A
21
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200906 Version 2 Revision 5 Print Date/Time: 2011/09/23 13:48:46
Molded Dual-In-Line Pack(
NS Package Number N08
Molded Dual-In-Line Package (N)
NS Package Number N14A
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22
200906 Version 2 Revision 5 Print Date/Time: 2011/09/23 13:48:46
Notes
23
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200906 Version 2 Revision 5 Print Date/Time: 2011/09/23 13:48:46
Notes
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IC VOLTAGE-FREQUENCY CONVERTER, PDSO8, 0.150 INCH, PLASTIC, SOIC-8, Analog Special Function Converter
NSC
LM2907M-8EP
IC VOLTAGE-FREQUENCY CONVERTER, PDSO8, 0.150 INCH, PLASTIC, SOP-8, Analog Special Function Converter
NSC
LM2907M-8X
IC VOLTAGE-FREQUENCY CONVERTER, PDSO8, 0.150 INCH, PLASTIC, SO-8, Analog Special Function Converter
NSC
LM2907MEP
IC VOLTAGE-FREQUENCY CONVERTER, PDSO14, PLASTIC, SOP-14, Analog Special Function Converter
NSC
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