LF147QML
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LF147QML Wide Bandwidth Quad JFET Input Operational Amplifier
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1FEATURES DESCRIPTION
The LF147 is a low cost, high speed quad JFET input
23 Internally Trimmed Offset Voltage: 5 mV Max operational amplifier with an internally trimmed input
Low Input Bias Current: 50 pA Typ. offset voltage ( BI-FET II™ technology). The device
Low Input Noise Current: 0.01 pA/Hz Typ. requires a low supply current and yet maintains a
large gain bandwidth product and a fast slew rate. In
Wide Gain Bandwidth: 4 MHz Typ. addition, well matched high voltage JFET input
High Slew Rate: 13 V/μs Typ. devices provide very low input bias and offset
Low Supply Current: 7.2 mA Typ. currents. The LF147 is pin compatible with the
standard LM148. This feature allows designers to
High Input Impedance: 1012ΩTyp. immediately upgrade the overall performance of
Low Total Harmonic Distortion: existing LF148 and LM124 designs.
AV= 10, RL= 10K, VO= 20VP-P The LF147 may be used in applications such as high
BW = 20Hz 20KHz 0.02% Typ. speed integrators, fast D/A converters, sample-and-
Low 1/f Noise Corner: 50 Hz Typ. hold circuits and many other circuits requiring low
input offset voltage, low input bias current, high input
Fast Settling Time to 0.01%: 2 μs Typ. impedance, high slew rate and wide bandwidth. The
device has low noise and offset voltage drift.
CONNECTION DIAGRAM
Dual-In-Line Package (CDIP)
Top View
See Package Number J0014A
1Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2BI-FET II is a trademark of dcl_owner.
3All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date. Copyright © 2005–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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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.
Simplified Schematic
Figure 1. ¼ Quad
Detailed Schematic
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Absolute Maximum Ratings (1)
Supply Voltage ±22V
Differential Input Voltage ±38V
Input Voltage Range (2) ±19V
Output Short Circuit Duration (3) Continuous
Power Dissipation (4) (5) 900 mW
TJmax 150°C
θJA CERDIP 70°C/W
Operating Temperature Range 55°C TA125°C
Storage Temperature Range 65°C TA150°C
Lead Temperature (Soldering, 10 sec.) 260°C
ESD (6) 900V
(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for
which the device is functional, but do not ensure specific performance limits. For specifications and test conditions, see the Electrical
Characteristics. The specifications apply only for the test conditions listed. Some performance characteristics may degrade when the
device is not operated under the listed test conditions.
(2) Unless otherwise specified the absolute maximum negative input voltage is equal to the negative power supply voltage.
(3) Any of the amplifier outputs can be shorted to ground indefinitely, however, more than one should not be simultaneously shorted as the
maximum junction temperature will be exceeded.
(4) The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax (maximum junction temperature),
θJA (Package junction to ambient thermal resistance), and TA(ambient temperature). The maximum allowable power dissipation at any
temperature is PDmax = (TJmax TA) / θJA or the number given in the Absolute Maximum Ratings, whichever is lower.
(5) Max. Power Dissipation is defined by the package characteristics. Operating the part near the Max. Power Dissipation may cause the
part to operate outside specified limits.
(6) Human body model, 1.5 kΩin series with 100 pF.
Quality Conformance Inspection
Mil-Std-883, Method 5005 - Group A
Subgroup Description Temp (°C)
1 Static tests at 25
2 Static tests at 125
3 Static tests at -55
4 Dynamic tests at 25
5 Dynamic tests at 125
6 Dynamic tests at -55
7 Functional tests at 25
8A Functional tests at 125
8B Functional tests at -55
9 Switching tests at 25
10 Switching tests at 125
11 Switching tests at -55
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LF147 883 Electrical Characteristics DC Parameters
The following conditions apply, unless otherwise specified: VS= ±20V, VCM = 0V, RS= 50
Sub-
Symbol Parameter Conditions Notes Min Max Unit groups
VIO Input Offset Voltage RS= 10K5 mV 1
8 mV 2, 3
IIO Input Offset Current RL= 10K0.1 nA 1
25 nA 2, 3
±IIB Input Bias Current RL=10K-0.2 0.2 nA 1
-50 50 nA 2, 3
VCM Input Common Mode Voltage (1) -16 16 V 1, 2, 3
Range
CMRR Common Mode Rejection Ratio RS10K, VCM = ±16V 80 dB 1, 2, 3
PSRR Power Supply Rejection Ratio VS= ±20V to VS= ±5V 80 dB 1, 2, 3
ISSupply Current 11 mA 1, 2, 3
IOS Output Short Circuit VS= ±15V, VI= +1V, -57 -13 mA 1, 3
Output short to GND -40 -6 mA 2
VS= ±15V, VI= -1V, 13 57 mA 1, 3
Output short to GND 6 40 mA 2
AVS Large Signal Voltage Gain VS= ±15V, VO= 0 to +10V, (2) 50 V/mV 4
RL= 2K, RS= 10K(2) 25 V/mV 5, 6
VS= ±15V, VO= 0 to -10V (2) 50 V/mV 4
RL= 2 K, RS=10K(2) 25 V/mV 5, 6
VOOutput Voltage Swing VS= ±15V, RL= 10K,12 V 4, 5, 6
VI= +1V
VS= ±15V, RL= 10K,-12 V 4, 5, 6
VI= -1V
VS= ±15V, RL= 2K, VI= +1V 10 V 4, 5, 6
VS= ±15V, RL= 2K, VI= -1V -10 V 4, 5, 6
(1) Specified by CMRR test
(2) V/mV in units column is equivalent to K in datalog
LF147 883 Electrical Characteristics AC Parameters
The following conditions apply, unless otherwise specified: VS= ±20V, VCM = 0V, RS= 50
Symbol Parameter Conditions Sub-
Notes Min Max Unit groups
SR Slew Rate VI= -5V to +5V, AV=1 8 V/µs 7
RL= 2K, CL = 100pF 5 V/µs 8A, 8B
VI= +5V to -5V, AV= 1 8 V/µS 7
RL= 2K, CL = 100pF 5 V/µS 8A, 8B
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LF147 SMD Electrical Characteristics DC Parameters
The following conditions apply, unless otherwise specified: VS= ±15V, VCM = 0V, RS= 0, RL= Open Sub-
Symbol Parameter Conditions Notes Min Max Unit groups
VIO Input Offset Voltage Vcc = ±15V -9 9 mV 1
-15 15 mV 2, 3
Vcc = ±9V -9 9 mV 1
IIO Input Offset Current -0.1 0.1 nA 1
-20 20 nA 2
±IIB Input Bias Current -0.2 0.2 nA 1
-50 50 nA 2
AVS Large Signal Voltage Gain VS= ±15V, VO= 0 to +10V, 35 V/mV 4
RL= 2K15 V/mV 5, 6
VS= ±15V, VO= 0 to -10V, 35 V/mV 4
RL= 2K15 V/mV 5, 6
+VOOutput Voltage Swing VS= ±15V, RL= 10K12 V 4, 5, 6
VS= ±15V, RL= 2K10 V 4, 5, 6
-VOOutput Voltage Swing VS= ±15V, RL= 10K-12 V 4, 5, 6
VS= ±15V, RL= 2K-10 V 4, 5, 6
VCM Input Common Mode Voltage (1) ±11 V 1, 2, 3
Range
CMRR Common Mode Rejection Ratio VCM = ±11V 80 dB 1
+PSRR Power Supply Rejection Ratio +VS= 15 to 9V, -VS= -15V 80 dB 1
-PSRR Power Supply Rejection Ratio +VS= 15V, -VS= -15 to -9V 80 dB 1
+ISSupply Current 14 mA 1
-ISSupply Current -14 mA 1
+IOS Output Short Circuit Current VS= ±15V -57 -13 mA 1, 3
-40 -6 mA 2
-IOS Output Short Circuit Current VS= ±15V 13 57 mA 1, 3
6 40 mA 2
(1) Specified by CMRR test
LF147 SMD Electrical Characteristics AC Parameters
The following conditions apply, unless otherwise specified: VS= ±15V, VCM = 0V, RS= 0, RL= Open Sub-
Symbol Parameter Conditions Notes Min Max Unit groups
SR Slew Rate VI= -5V to +5V, AV=1 8 V/µs 7
RL= 2K, CL= 100pF 5 V/µs 8A, 8B
VI= +5V to -5V, AV=1 8 V/µS 7
RL= 2K, CL= 100pF 5 V/µS 8A, 8B
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Typical Performance Characteristics
Input Bias Current Input Bias Current
Figure 2. Figure 3.
Positive Common-Mode
Supply Current Input Voltage Limit
Figure 4. Figure 5.
Negative Common-Mode
Input Voltage Limit Positive Current Limit
Figure 6. Figure 7.
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Typical Performance Characteristics (continued)
Negative Current Limit Output Voltage Swing
Figure 8. Figure 9.
Output Voltage Swing Gain Bandwidth
Figure 10. Figure 11.
Bode Plot Slew Rate
Figure 12. Figure 13.
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Typical Performance Characteristics (continued)
Distortion
vs Undistorted Output Voltage
Frequency Swing
Figure 14. Figure 15.
Open Loop Frequency Common-Mode Rejection
Response Ratio
Figure 16. Figure 17.
Power Supply Rejection Equivalent Input Noise
Ratio Voltage
Figure 18. Figure 19.
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Typical Performance Characteristics (continued)
Open Loop Voltage Gain Output Impedance
Figure 20. Figure 21.
Inverter Settling Time
Figure 22.
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Pulse Response
RL=2kΩ, CL= 10 pFSmall Signal Inverting Small Signal Non-Inverting
Large Signal Inverting Large Signal Non-Inverting
Current Limit (RL=100Ω)
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APPLICATION INFORMATION
The LF147 is an op amp with an internally trimmed input offset voltage and JFET input devices (BI-FET II).
These JFETs have large reverse breakdown voltages from gate to source and drain eliminating the need for
clamps across the inputs. Therefore, large differential input voltages can easily be accommodated without a large
increase in input current. The maximum differential input voltage is independent of the supply voltages. However,
neither of the input voltages should be allowed to exceed the negative supply as this will cause large currents to
flow which can result in a destroyed unit.
Exceeding the negative common-mode limit on either input will force the output to a high state, potentially
causing a reversal of phase to the output. Exceeding the negative common-mode limit on both inputs will force
the amplifier output to a high state. In neither case does a latch occur since raising the input back within the
common-mode range again puts the input stage and thus the amplifier in a normal operating mode.
Exceeding the positive common-mode limit on a single input will not change the phase of the output; however, if
both inputs exceed the limit, the output of the amplifier will be forced to a high state.
The amplifiers will operate with a common-mode input voltage equal to the positive supply; however, the gain
bandwidth and slew rate may be decreased in this condition. When the negative common-mode voltage swings
to within 3V of the negative supply, an increase in input offset voltage may occur.
Each amplifier is individually biased by a zener reference which allows normal circuit operation on ±4.5V power
supplies. Supply voltages less than these may result in lower gain bandwidth and slew rate.
The LF147 will drive a 2 kΩload resistance to ±10V over the full temperature range. If the amplifier is forced to
drive heavier load currents, however, an increase in input offset voltage may occur on the negative voltage swing
and finally reach an active current limit on both positive and negative swings.
Precautions should be taken to ensure that the power supply for the integrated circuit never becomes reversed in
polarity or that the unit is not inadvertently installed backwards in a socket as an unlimited current surge through
the resulting forward diode within the IC could cause fusing of the internal conductors and result in a destroyed
unit.
As with most amplifiers, care should be taken with lead dress, component placement and supply decoupling in
order to ensure stability. For example, resistors from the output to an input should be placed with the body close
to the input to minimize “pick-up” and maximize the frequency of the feedback pole by minimizing the
capacitance from the input to ground.
A feedback pole is created when the feedback around any amplifier is resistive. The parallel resistance and
capacitance from the input of the device (usually the inverting input) to AC ground set the frequency of the pole.
In many instances the frequency of this pole is much greater than the expected 3 dB frequency of the closed
loop gain and consequently there is negligible effect on stability margin. However, if the feedback pole is less
than approximately 6 times the expected 3 dB frequency a lead capacitor should be placed from the output to the
input of the op amp. The value of the added capacitor should be such that the RC time constant of this capacitor
and the resistance it parallels is greater than or equal to the original feedback pole time constant.
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Typical Applications
Figure 23. Digitally Selectable Precision Attenuator
All resistors 1% tolerance
Accuracy of better than 0.4% with standard 1% value resistors
No offset adjustment necessary
Expandable to any number of stages
Very high input impedance
A1 A2 A3 VO
Attenuation
0 0 0 0
001 1 dB
010 2 dB
011 3 dB
100 4 dB
101 5 dB
110 6 dB
111 7 dB
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Figure 24. Long Time Integrator with Reset, Hold and Starting Threshold Adjustment
VOUT starts from zero and is equal to the integral of the input voltage with respect to the threshold voltage:
Output starts when VIN VTH
Switch S1 permits stopping and holding any output value
Switch S2 resets system to zero
Figure 25. Universal State Variable Filter
For circuit shown: fO= 3 kHz, fNOTCH= 9.5 kHz
Q=3.4
Passband gain: Highpass—0.1
Bandpass—1
Lowpass—1
Notch—10
fo×Q 200 kHz
10V peak sinusoidal output swing without slew limiting to 200 kHz
See LM148 data sheet for design equations
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Date Revision Section Originator Changes
Released
04/18/05 A New Release into corporate format L. Lytle 2 MDS datasheets converted into one Corp.
datasheet format. MNLF147–X Rev. 0A2 and
MDLF147–X Rev. 0A1, data sheets will be
Archived
03/20/13 A All Changed layout of National Data Sheet to TI
format
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PACKAGE OPTION ADDENDUM
www.ti.com 11-Apr-2013
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status
(1)
Package Type Package
Drawing Pins Package
Qty Eco Plan
(2)
Lead/Ball Finish MSL Peak Temp
(3)
Op Temp (°C) Top-Side Markings
(4)
Samples
LF147J/883 ACTIVE CDIP J 14 25 TBD Call TI Call TI -55 to 125 LF147J/883 Q
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4) Multiple Top-Side Markings will be inside parentheses. Only one Top-Side Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a
continuation of the previous line and the two combined represent the entire Top-Side Marking for that device.
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In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
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