TI1 LM2907EP Lm2907ep / lm2917ep enhanced plastic frequency to voltage converter Datasheet

LM2907EP,LM2917EP
LM2907EP / LM2917EP Enhanced Plastic Frequency to Voltage Converter
Literature Number: SNOSAB0A
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 input frequency reaches or exceeds a selected rate. The
tachometer uses a charge pump technique and offers frequency 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.
The op amp/comparator is fully compatible with the tachometer 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.
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.
The more versatile configurations provide differential
tachometer input and uncommitted op amp inputs. With this
version the tachometer input may be floated and the op amp
becomes suitable for active filter conditioning of the tachometer output.
Both of these configurations are available with an active shunt
regulator connected across the power leads. The regulator
clamps the supply such that stable frequency to voltage and
frequency to current operations are possible with any supply
voltage and a suitable resistor.
ENHANCED PLASTIC
• Extended Temperature Performance of −40°C to +85°C
• Baseline Control - Single Fab & Assembly Site
• Process Change Notification (PCN)
• Qualification & Reliability Data
• Solder (PbSn) Lead Finish is standard
• Enhanced Diminishing Manufacturing Sources (DMS)
Support
■ 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 referenced input
Built-in zener on LM2917EP
±0.3% linearity typical
Ground referenced tachometer is fully protected from
damage due to swings above VCC and below ground
Advantages
■
■
■
■
Output swings to ground for zero frequency input
Easy to use; VOUT = fIN × VCC × R1 × C1
Only one RC network provides frequency doubling
Zener regulator on chip allows accurate and stable
frequency to voltage or current conversion (LM2917EP)
Applications
■ Selected Military Applications
■ Selected Avionics Applications
Ordering Information
Part Number
VIN Part Number
NS Package Number (Note 3)
LM2907MX-8EP
V62/04635-01
M08A
LM2917MXEP
V62/04635-02
M14A
(Note 1, Note 2)
TBD
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
200906 Version 2 Revision 5
www.national.com
Print Date/Time: 2011/09/23 13:48:46
LM2907EP/LM2917EP Enhanced Plastic Frequency to Voltage Converter
OBSOLETE
September 23, 2011
LM2907EP/LM2917EP Enhanced Plastic
Block and Connection Diagrams
Dual-In-Line and Small Outline Packages, Top Views
20090601
20090602
LM2907-8
See NS Package Number M08A or N08E
LM2917-8
See NS Package Number M08A or N08E
20090603
20090604
LM2907
See NS Package Number M14A or N14A
www.national.com
LM2917
See NS Package Number M14A or N14A
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If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage
Collector Voltage
Differential Input Voltage
Tachometer
Op Amp/Comparator
Input Voltage Range
Tachometer
LM2907-8EP, LM2917-8EP
LM2907EP, LM2917EP
28V
28V
28V
28V
±28V
0.0V to +28V
Electrical Characteristics
Symbol
0.0V to +28V
1200 mW
1580 mW
−40°C to +85°C
−65°C to +150°C
260°C
215°C
220°C
VCC = 12 VDC, TA = 25°C, see test circuit
Parameter
Conditions
Min
Typ
Max
Units
±10
±25
±40
mV
TACHOMETER
Input Thresholds
VIN = 250 mVp-p @ 1 kHz (Note 5)
Hysteresis
VIN = 250 mVp-p @ 1 kHz (Note 5)
Offset Voltage
VIN = 250 mVp-p @ 1 kHz (Note 5)
30
LM2907EP/LM2917EP
LM2907-8EP/LM2917-8EP
mV
3.5
5
10
15
mV
mV
1
μA
Input Bias Current
VIN = ±50 mVDC
0.1
VOH
Pin 2
VIN = +125 mVDC (Note 6)
8.3
VOL
Pin 2
VIN = −125 mVDC (Note 6)
I2, I3
Output Current
V2 = V3 = 6.0V (Note 7)
I3
Leakage Current
I2 = 0, V3 = 0
K
Gain Constant
(Note 6)
0.9
1.0
1.1
Linearity
fIN = 1 kHz, 5 kHz, 10 kHz (Note 8)
−1.0
0.3
+1.0
%
3
10
mV
500
nA
VCC−1.5V
V
V
2.3
140
180
V
240
μA
0.1
μA
OP/AMP COMPARATOR
VOS
VIN = 6.0V
IBIAS
VIN = 6.0V
50
Input Common-Mode Voltage
0
Voltage Gain
40
200
V/mV
50
mA
Output Sink Current
VC = 1.0
Output Source Current
VE = VCC −2.0
10
Saturation Voltage
ISINK = 5 mA
0.1
ISINK = 20 mA
ISINK = 50 mA
1.0
RDROP = 470Ω
7.56
mA
0.5
V
1.0
V
1.5
V
ZENER REGULATOR
Regulator Voltage
Series Resistance
10.5
Temperature Stability
+1
Total Supply Current
3.8
V
15
Ω
mV/°C
6
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.
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200906 Version 2 Revision 5
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LM2907EP/LM2917EP Enhanced Plastic
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
Vapor Phase (60 seconds)
Infrared (15 seconds)
Absolute Maximum Ratings (Note 4)
LM2907EP/LM2917EP Enhanced Plastic
Test Circuit and Waveform
20090606
Tachometer Input Threshold Measurement
20090607
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LM2907EP/LM2917EP Enhanced Plastic
Typical Performance Characteristics
Total Supply Current
Zener Voltage vs
Temperature
20090640
20090641
Normalized Tachometer
Output vs Temperature
Normalized Tachometer
Output vs Temperature
20090643
20090642
Tachometer Currents I2
and I3 vs Supply Voltage
Tachometer Currents I2
and I3 vs Temperature
20090644
20090645
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LM2907EP/LM2917EP Enhanced Plastic
Tachometer Linearity
vs Temperature
Tachometer Linearity
vs Temperature
20090647
20090646
Tachometer Linearity vs R1
Tachometer Input Hysteresis
vs Temperature
20090648
20090649
Op Amp Output Transistor
Characteristics
Op Amp Output Transistor
Characteristics
20090651
20090650
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The LM2907EP series of tachometer circuits is designed for
minimum external part count applications and maximum versatility. In order to fully exploit its features and advantages
let's examine its theory of operation. The first stage of operation is a differential amplifier driving a positive feedback flipflop 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 provide 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.
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 outside the limits of the supply voltage being used. It is very
important that an input not go below ground without some resistance in its lead to limit the current that will then flow in the
epi-substrate diode.
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 linearly
between two voltages whose difference is VCC/2. Then in one
half cycle of the input frequency or a time equal to 1/2 fIN the
change in charge on the timing capacitor is equal to VCC/2 ×
C1. The average amount of current pumped into or out of the
capacitor then is:
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 internally 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 linearity. 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:
It appears R1 can be chosen independent of ripple, however
response time, or the time it takes VOUT to stabilize at a new
voltage increases as the size of C2 increases, so a compromise between ripple, response time, and linearity must be
chosen carefully.
As a final consideration, the maximum attainable input frequency is determined by VCC, C1 and I2:
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 regulator. 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 very accurately into the
load resistor R1, connected to ground, such that if the pulses
of current are integrated with a filter capacitor, then VO = ic ×
R1, and the total conversion equation becomes:
VO = VCC × fIN × C1 × R1 × K
Where K is the gain constant—typically 1.0.
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200906 Version 2 Revision 5
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LM2907EP/LM2917EP Enhanced Plastic
The size of C2 is dependent only on the amount of ripple voltage allowable and the required response time.
Applications Information
LM2907EP/LM2917EP Enhanced Plastic
Typical Applications
Minimum Component Tachometer
20090608
20090609
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LM2907EP/LM2917EP Enhanced Plastic
Zener Regulated Frequency to Voltage Converter
20090610
Breaker Point Dwell Meter
20090611
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LM2907EP/LM2917EP Enhanced Plastic
Voltage Driven Meter Indicating Engine RPM
VO = 6V @ 400 Hz or 6000 ERPM (8 Cylinder Engine)
20090612
Current Driven Meter Indicating Engine RPM
IO = 10 mA @ 300 Hz or 6000 ERPM (6 Cylinder Engine)
20090613
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LM2907EP/LM2917EP Enhanced Plastic
Capacitance Meter
VOUT = 1V–10V for CX = 0.01 to 0.1 mFd
(R = 111k)
20090614
Two-Wire Remote Speed Switch
20090615
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LM2907EP/LM2917EP Enhanced Plastic
100 Cycle Delay Switch
20090616
Variable Reluctance Magnetic Pickup Buffer Circuits
20090617
20090639
Precision two-shot output frequency
equals twice input frequency.
Pulse height = VZENER
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20090619
20090618
Flashing LED Indicates Overspeed
20090620
Flashing begins when fIN ≥ 100 Hz.
Flash rate increases with input frequency
increase beyond trip point.
13
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LM2907EP/LM2917EP Enhanced Plastic
Finger Touch or Contact Switch
LM2907EP/LM2917EP Enhanced Plastic
Frequency to Voltage Converter with 2 Pole Butterworth Filter to Reduce Ripple
20090621
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200906 Version 2 Revision 5
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20090623
20090622
Some Frequency Switch Applications May Require Hysteresis in the
Comparator Function Which can be Implemented in Several Ways:
20090624
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LM2907EP/LM2917EP Enhanced Plastic
Overspeed Latch
LM2907EP/LM2917EP Enhanced Plastic
20090625
20090626
20090628
20090627
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200906 Version 2 Revision 5
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20090630
20090629
Changing Tachometer Gain Curve or Clamping the Minimum
Output Voltage
20090632
20090631
17
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LM2907EP/LM2917EP Enhanced Plastic
Changing the Output Voltage for an Input Frequency of Zero
LM2907EP/LM2917EP Enhanced Plastic
Anti-Skid Circuit Functions
“Select-Low” Circuit
20090633
20090634
VOUT is proportional to the lower of the two input wheel speeds.
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LM2907EP/LM2917EP Enhanced Plastic
“Select-High” Circuit
20090635
20090636
VOUT is proportional to the higher of the two input wheel speeds.
“Select-Average” Circuit
20090637
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LM2907EP/LM2917EP Enhanced Plastic
Equivalent Schematic Diagram
20090638
*This connection made on LM2907-8EP and LM2917-8EP only.
**This connection made on LM2917EP and LM2917-8EP only.
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200906 Version 2 Revision 5
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LM2907EP/LM2917EP Enhanced Plastic
Physical Dimensions inches (millimeters) unless otherwise noted
8-Lead (0.150″ Wide) Molded Small Outline Package, JEDEC
NS Package Number M08A
14-Lead Molded SO Package
NS Package Number M14A
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LM2907EP/LM2917EP Enhanced Plastic
Molded Dual-In-Line Package (N)
NS Package Number N08E
Molded Dual-In-Line Package (N)
NS Package Number N14A
www.national.com
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LM2907EP/LM2917EP Enhanced Plastic
Notes
23
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LM2907EP/LM2917EP Enhanced Plastic Frequency to Voltage Converter
Notes
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