LF13741N ,MONOLITHIC JFET INPUT OPERATIONAL AMPLIFIERElectrical Characteristics (Note 4)
H Package
triA (T ypicai)
(Note 1) 70°C/W
(Note 2) 175°C/ ..
LF147D ,Quad operational amplifier (JFET)ABSOLUTE MAXIMUM RATINGS Symbol Parameter LF147 LF247 LF347 Unit1)V±18 VCC Supply voltage - ..
LF147DT ,WIDE BANDWIDTH QUAD J-FET OPERATIONAL AMPLIFIERSLF147 - LF247LF347WIDE BANDWIDTHQUAD J-FET OPERATIONAL AMPLIFIERS ■ LOW POWER CONSUMPTION +■ W ..
LF147J ,Wide Bandwidth Quad JFET Input Operational AmplifiersMICROCIRCUIT DATA SHEETOriginal Creation Date: 02/08/95MNLF147-X REV 0A2Last Update Date: 11/23/98L ..
LF147J/883 ,Wide Bandwidth Quad JFET Input Operational Amplifiersapplications such as high speed integrators, fast D/A converters,sample-and-hold circuits and many ..
LF147J-SMD , LF147QML Wide Bandwidth Quad JFET Input Operational Amplifier
LM140LAH-5.0 ,Series 3-Terminal Positive RegulatorsGeneral DescriptionThe LM140LA is an improved version of the LM78LXX series with a tighter output v ..
LM140LAH-5.0 ,Series 3-Terminal Positive RegulatorsMILITARY DATA SHEETOriginal Creation Date: 09/07/95MNLM140LA-15-H REV 0B0Last Update Date: 12/10/96 ..
LM140LAH-5.0/883 ,3-Terminal Positive RegulatorsFeaturesg2% V specification, 0.04%/V line regulation, andOUTYLine regulation of 0.04%/V0.01%/mAload ..
LM1414J ,10 mA, 1000 mW, dual differential voltage comparatorapplications requiring high accuracy and
fast response times. The device is constructed on a singl ..
LM1414N ,10 mA, 1000 mW, dual differential voltage comparatorLM1514/LM1414
National
Semiconductor
LM1514/LM1414
Dual Differential Voltage Comparator
..
LM143H ,High Voltage Operational Amplifierapplications, the LM143 provides aYpower bandwidth that covers the entire audio spectrum. In Output ..
LF13741H-LF13741N
MONOLITHIC JFET INPUT OPERATIONAL AMPLIFIER
LF13741
National
Semiconductor
LF13741
Bl-FET IITM Tochnolow
Monolithic JFET Input Operational Amplifier
General Description
The LF13741 is a 741 with Bl-FETW input followers on the
same die. Familiar operating tthttratMtistitps--those of a
741--with the added advantage of low input bias current
make the LF13741 easy to use. Monolithic fabrication
makes this "drop-in-replacement" operational amplifier very
economical.
Applications in which the LF13741 excels are those which
require low bias current, moderate speed and low cost. A
few examples include high impedance transducer amplifi-
ers. photocell amplifiers, buffers for high impedance, slow to
moderate speed sources and buffers in sample-and-hold
type systems where leakage from the hold capacitor node
must be kept to a minimum.
Systems designers can take full advantage of their knowl-
edge of the 741 when designing with the LF13741 to
achieve extremely rapid "design times." The LF13741 can
also be used in existing sockets to make the "error budge "
for input bias and/or offset currents negligible and in many
cases eliminate trimming. For higher speed and lower noise
use the LF155, LF156, LF157 series of Bl-FET operational
amplifiers.
Features
a Low input bias current 50 pA
I: Input common-mode range to positive supply voltage
a Low input noise current 0.01 pAMTz
I: High input impedance 5 M 10110
n Familiar operating characteristics
Advantages
l: FET inputs-741 operating characteristics
a Low cost
tt Ease of use
a Standard supplies
n Standard pin outs
n Non-rectiiying input for RF environment
a Rapid "design time"
Applications
u Smoke detectors
tt I to V converters
ll High impedance buffers
a Low drift sample and hold circuits
I: High input impedance, slow comparators
a Long time timers
a Low drift peak detectors
rt Supply current monitors
a Low error budget systems
Simplified Schematic
y-u- IALAuc:
pr-tUm"
MltRO-
FHOCEMI
All on one die.
TL/Hf9296-1
SERIAL DATA OUT
(lSB FIRST)
l-H-H-T-l
'l, unLo ID u
.-o EE l
Typical Applications
Inexpensive MItrroprottessttr DIA
ANAIDG
h-b CUITIOL
UUTPUY
r = RC =1.44T
TL/H/9296-2
Absolute Maximum Ratings
If Mllltary/Aerospace specified devices are required, H Package N Package
please contact the National Sgmlttorttiutttttr Sales triA (Typicai)
omttenNatrlbutttra for avallablllty and apettmttations. (Note 1) 70°C/W 163°C /W
Supply Voltage i 18V (Note 2) 175''C/W 218°C/W
Operating Temperature Range 0°C to + 70'C dic (Typical) 25°C/W
Ti(MAX) 100'C Metal Package Lead Temperature
Differential Input Voltage fs 30V (Sgldering, 10 see.) . 30ty'C
Input Voltage Range (Note 3) 1 16V Plastic fackage (Soldenr19, 4 sec.) 260 C
Output Short Circuit Duration Continuous ESD rating to be determined.
Storage Temperature Range - 65'C to + 150'C
DC Electrical Characteristics (Note 4)
Symbol Parameter Conditions Mln Typ Max Units
Vos IrtputOffststVoltage Rs = 10 kn,TA = 25°C 5 15 V
Over Temperature 20
Voltage Offset Adjustment 1 0 mV
AVos/AT Average TC of Input Offset Rs == 10 RD 10 'sh/ " C
Voltage
los Input Offset Current T, = 25°C (Notes 4, 5) 10 50 pA
T] s 70°C 2 nA
IB Input Bias Current Ti = 25°C (Notes 4, 5) 50 200 pA
Ti s; 70°C 1.6 8 nA
Rm Input Resistance TI -- 25% 5 M 1011 n
AVOL Large SignalVoltage Gain Vs = i15V. TA = 25'C
Vo-- i10V,RL=2kn 25 100 V/mV
Over Temperature 15 V/mV
V0 OutputVoltage Swing Vs = * 15V, RL = 10 kn. i 12 i 13 V
VCM InputCommon-Mode Voltage Vs = i15V +15.1
, 11 V
Range - 12
GMRR Common-Mode Rejection Ratio Rs s; 10 en 70 90 dB
PSRR Supply Voltage Rejection Ratio (Note 6) 77 96 dB
Is Supply Current 2 4 mA
LVLSH'I
LF13741
AC Electrical Characteristics (Note 4)
Symbol Parameter Condltlons Min Typ Max Units
SR Slew Rate vs = i15V, TA = 25t 0.5 V/ps
GBW Gain-Bandwidth Product Vs = i 15V, TA = 25°C 1.0 MHz
en Equivalent Input Noise Voltage TA = 25°C. Rs = 1000
f = 100 Hz 50 nvMTi
f = 1000 Hz 37 nvMTi
In Equivalent Input Noise Current Ti = 25 C p A I FE
f = 100 Hz 0.01 Fr/Tr-iz"
f-- 1000 Hz 0.01 p z
Note 1: The value gtven Is in 400 Linear Feet/Min air flow.
Note 2: The Value gMm is in static air.
Note 3: Unless otherwise spatMed the absolute maximum negative input voltage is equal to the negative power supply voltage.
Note 4: These specifications apply for Vs ' 115V and ty'C 3 TA s; + 700. Vos, IB, and log are measured at Vtas = 0.
Note 5: The input bias currents are junction leakage currents which 'approximately double for every 10'C increase in the iunetion temperature, Ty Due to limited
prottmiion test time, the input bias currents measured are correlated to junction temperature. In normal operation the junction temperature rises above the ambient
temperature as a result of internal power dissipation, PD. Ti == TA + 0% PD where (rm is the thermal resistance from junction to ambient. Use of a heat sink is
recommended if input bias current is to be kept to a minimum.
Note 6: Supply Voltage Rejection Ratio is measured tor both supply magnitudes increasing or decreasing simultaneously in accordance with common practice trom
Its = t10v to t15V.
Typical Performance Characteristics
IWT IIAS 0083‘” ‘IA’
IEGATIVE COWOIUODE
II'UT VBYlAGE llllT (V) IEBATIVE 00TH" VOLTAGE SWIG (V)
mrrrur voma: sum «v.»
Input Blas Current
ttt y'. ""
, -u°c
Att " n s "
comumnz VULTAGE M
Negative Current lelt
n g t. S mm:
a MI " an so
0tltNT SINK CURRENTHIM
Negative Common-Mode
" Input Voltage lell
" s TA 5 an":
ll 5 " " "
IIGITIV! MY " LTABE M
Voltage Swing
I I In " "
SUNLV VOLTAGE (sv)
INN" IIAS CURREIY (M)
POSITIVE OUWUT VOLTAGE nuns: (V)
0"" l0” VOUABE GAIN (WV)
UMYV GAII mn'fl‘l’fl (“Ill
a Input Bias Current
vs-usv
" " M " "
TEMPERATURE (°CI
Posltlve Current Limit
" III "
tt0TNT SOURCE CURRENT
" g TA 5 "rt
SUPPLY VOLTAGE (till
Galn Bandwidth
Vs' LHV
" 2n " " 50
TEWE‘MYURE Ctr)
Open Loop Voltage Galn (WV)
rosmv: mm: cmanuan:
voume ulm (V) sumv CURRENT (M)
mmur voum: smur- tvm
SLEI RATE (V/ufl
' Supply Current
" S i" S "h
I " II tit "
SUWLV VOLTAGE (sA0
Positive Common-Mode
Input Voltage lelt
" s I. s WM:
5 II) 15 "
POSITIVE SUPPLY VOLTAGE WI
Output Voltage Swing
vs . mv
t. " 25':
01mm LoAn ta.) ta
Slew Rate
- :IEV
tty 20 30 ID
TEMPEttATtlttg ce)
TLIH/9296-3
lVLSI-J'I
LF13741
Typical Performance Characteristics (Continued)
' Bode Plot
" vs-asv
a . lk'
s 4 ii,'.
k" -N g
" M5 a
rnmusucv mm
Undlstttrted Output
" Voltage Swlng
Its" "
11 “l. . n
TA . 15°C
" Alt -I
" <1% DIST
OUTPUT vomn: anus w":
" 10k ttlot "
FREQUENCY (u)
LF13741 Pulse Responses
Small Slgnal Non-lnvertlng
Pulse Response
COHOHUDE REJECYIDI RATIO (‘3)
EOUIVALEIT II'UT NOISE VOLTAGE (-VA/fli)
Common-Mode Rejectlon
tt Ratio
vs . 215v
T . 25"C
" 100 " I" tWlk tM
FREQUEXCV (H1)
Equivalent Input
Nolse Voltage
" tN "
FREQUENCY (Hz)
NWEH SUPPLY REJECTION RATIO (fl)
OUTPUT IMPEDANCE (n)
Power Supply Rejection
Its I ttW
?SIJFPLV
Ill tin " IOI
[HEIWEHCV thd
lWi "'
" Output Impedance
" " MW
TA I 25“:
m " "i took "I
FREQUENCY (Hz)
TL/ HN296-4
Small Signal Inverting
Pulse Response
TIME 0.5uI/DIV
Av = + 1(Follower)
OUTPUT VOLTAGE SWING (50 mV/DIVI
TL/H/9296-5
Av = -1tlnverter)
Mlc4lgi19
_ _ J: - SEW:
TIME os us/DIV
TL/H/9296-6
Typical Performance Characteristics (Continued)
LF13741 Pulse Responses (Continued)
Large Slgnal Non-inverting
Pulse Response
OUTPUT VOLTAGE SWING (5V/DIV)
TIME tll .us/DIV
TL/H/9296-7
Application Hints
GENERAL CHARACTERISTICS
The LF13741 makes the job of converting from a bipolar to
an FET input op amp easy. As a systems designer you are
probably very familiar with the operating characteristics of a
741 op amp. In fact, many of you have used 741s with FET
input followers-thath lust what the LF13741 is, but it's all
on a single die.
When you need a low cost, reliable, well known op amp with
low input currents and moderate speed, use an LF13741.
DIFFERENTIAL INPUTS
You don't have to use clamps across the inputs for differen-
tial input voltages of less than 40V. The input JFETs of the
LF13741, in addition to being well matched, have large re-
verse breakdown voltages from gate to source and drain.
POSITIVE INPUT COMMON-MODE
VOLTAGE LIMIT
With the LF13741 (unlike the normal 741) you can take both
inputs above the positive supply voltage by more than 0.1 V
before the amph'iitar ceases to function. This feature enables
you to use the LF13741 to monitor and/or limit the Current
from the same supply used to power it (see typical applica-
tions).
If you exceed the positive common-mode voltage limit on
only one input, the output phase will remain correct. When
you exceed the limit on both inputs, the output phase is
unpredictable.
NEGATIVE INPUT COMMON-MODE
VOLTAGE LIMIT
There are two negative input voltage ranges of interest:
1. The range between the negative common-mode voltage
limit and the negative supply voltage.
2. Voltages which are more negative than the negative sup-
ply voltage.
Large Signal inverting
Pulse Response
dtlta!?iIl
OUTPUT VOLTAGE SWING l5V/DIV)
TIME 1ha/0N
TL/H/9296-8
If you take only one of the inputs of the LF13741 into the
first range, the output phase will remain correct. When you
take both inputs into this range the output will go toward the
positive supply voltage.
If you force either or both of the inputs into the second
range, an internal diode will be turned "ON." Unless you
externally limit the diode current to about 1 mA, the device
will be destroyed. In either case, limited or unlimited input
current. you cannot predict the output.
HANDLING
You do not have to take any special precautions in handling
the LF13741. It has JFET, as opposed to fragile MOSFET,
inputs.
APPLYING POWER
You should never: reverse the power supplies to the
LF13741; plug a part in backwards in a powered socket or
board; make the negative supply voltage more positive than
an input voltage.
Any one of these supply conditions will forward bias an in-
ternal diode. If you have not externally limited the resulting
current, the device will be destroyed.
LAYOUT
To ensure stability of response you should take care with
lead dress, component placement and power supply decou-
pling. For example, the body of feedback resistors (from
output to input pins) should be placed close to the inverting
input pin. Noise "pickup" and capacitance to ground from
the input pin will be minimized-effects which are usually
desirable.
Because of the very low input bias currents of the LF13741,
special care should be taken in printed circuit board layouts
to prevent unnecessary leakage from the input nodes, (see
Typical Applications).
LVLSH'I
LF13741
Application Hints (Continued)
FEEDBACK POLE
You create a feedback pole when you place resistive feed-
back around an amplifier. The parallel resistance and ca-
pacitance 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
there is negligibte effect on stability margin. However, if the
feedback pole is less than approximately six times the ex-
pected 3 dB frequency (a distinct possibility when using FET
op amps), you should place a lead capacitor 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 (Figure 1).
Typical Applications (Continued)
-1._ '
J-s-Ii""",
Tuwezee-e
Paresltic Input capacitance Ct I (a pF tor LF13741 plus any addnional
layout capacitance) interacts with feedback elements and creates undesir-
able high frequency pole. To compensate. add C2 such that: R262 I m GI.
FIGURE 1
Clrculta Uslng Guard Rings to Prevent Leakage Currents Between Inputs and v-
Guarded Voltage Follower
0 Vour
TL/H/9296-10
PC Layout
3 OUTPUT
TL/H/9298- 12
Guarded lnvertlng Amplifier
VIN o-MAr-6-----NVV----
AV - "E
-= R3 -- mllnz
TL/H/9296-11
" Layout
D O 3 4 so
ty-O I o--00TP0r
GUARD ,
TL/H/9296-13
Typical Applications (Continued)
Guarded Instrumentation Amplifier
" REFERENCE
VOLTAGE
OR t1R00rl0
Bridge Amplifier
. Vom- _ R2
=rri;RI'''R3m2--"4
OCMRR depends upon m-ro,
R2-R4 matching
OTrirn R4 to boost CMRR
oRti, R6 5% resistors
TL/H/9296-15
TL/H19296-14
lflBI-d'l
LF13741
Typical Applications (Continued)
Auto Zero Circuit for LF356
0 With the output having a 10k load resistor minimum pulse width to zero 2800 pa
. The capacitor on the output reduces the output switch glitch
Long Timer Timer
1/6 LF13333 tW
TIME '
l""" u
I - - -
RESET 5
" amusr
l" 15v
IN ”13333 [l
anssnow
- TIME ADJUST
. Time = :VTHRESHOLD
. Output goes high on time out
. Reverse op amp inputs for output low on time out
. C1 low leakage capacitor
NORMAL
TLIH/9296-17
TL/H/9296-. 1 6
UItra-Low (or High) Duty Cycle
Pulse Generator
OUWU'I
LFIJI"
. Low leakage capacitor
TL/H/9296-18
4.8 - zvs
= " I -
. ‘omPurHlGH R n 4.8 _ Vs
2Vs - 7.8
. = R2G f .._....-
‘OUTPUT LOW n Vs - 7.8
whorevs --- V+ + N-l
Typical Applications (Continued)
UplDown Stttlrtttttttt Generator/Step and Hold
I HOLD RESET
' mp STEP
tl4 ”13333 I """'"'i i'" mm: lm me
" HF tite I
TLt H/9296-1 9
Supply Current Irtdleatttr/Umitttr Low Drlft Adjustable Voltage Reference
TO SYSTEM sumv
sumv 0-1 must couuzmou
" COITROL CIRIUITRV
TLfH/9296-2o
. VOUT switches high when Rsls > VD
. Trim 250k potentiometer for drift adjust
. Trim 100k potentiometer tor VREF adjust
TL/HN29B-21
Low Drift Peak Detector
I mam Vour
T HE ww" 1 - a
nscovsnv
"ME ADJUS‘I T
TL/H/9296-23
'Low leakage capacitor
ӣ8 HT
LF13741
Typical Applications (Continued)
UltrrLow Drift Peak Detector
F0 ttttgt
Ihtt ' manta *c --
- 1mm l "a
It I RECOVERY TIME 'Low leakage capacitor
Tf = "NST
TL/Hl9296-24
'By adding D1 and Rt, Vm - tl during hold mode. Leakage 0102 provided by feedback path through Rt.
OLeakage of circuit is la plus leakage of cs.
IDS clamps VouT A1 to VIN - v.33 to improve speed and to limit the reveise bias of Dit.
cMaximum input frequency should be < Wr R1092, where Cm is the shunt capacitance of D2.
Comparator with Offset Adjust for HI-Z Inputs Low Current Ammeter
A 100 " FS.
' TL/H/9296-25
" + 3V s vm sv' + 0.1V
lruu SCALE
100 nA
500 nA
100 [LA
TUHIBZSG- 25
1 .5M 1.5M
300k 300k
300k 0
Typical Applications (Continued)
Long Tlme Integrator
INTEGRATE
'Low leakage capacitor
Preclslon Current Sink
TL/H/0296-26
Kaur = TIRE. whats IOUT S Koss
TL/H/9296-27
Photo Cell Amplifier (I to V Converter)
Connection Diagrams (Top Views)
TO-99 Metal Can Package
mm? o 0ilTPOT
NON-INVERTING
INPUT T,
TL/H/9296-30
Nola: Pin 4 connected to case.
Order Number LF13741H
500 NS Package Number Hose
0 V001
V001 = toR
TL/H/9296-29
DuaI-ln-Llne Package
BALANCE -1, - "
omtra2 = v+
INPUT -2. L OUTPUT
IC = s- BALANCE
TLfH/988-31
Order Number LF13741N
See NS Package Number NOSE
IMSH'I
This datasheet has been :
www.ic-phoenix.com
Datasheets for electronic components.
National Semiconductor was acquired by Texas Instruments.
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This file is the datasheet for the following electronic components:
LF13741 - product/lf13741?HQS=T|-nu|l-null-dscatalog-df-pf—nu||-wwe
LF13741 H - product/If13741h?HQS=T|-null-nulI-dscatalog-df-pf-nulI-wwe
LF13741 N - product/If13741n?HQS=T|—nuIl-nu|I-dscatalog-df-pf-nu||-wwe
LF13741 N - product/If13741n?HQS=T|—null-nu|I-dscatalog-df-pf-nuII-wwe
LF13741 H - product/If13741h?HQS=T|-nuIl-nu|I-dscatalog-df-pf-nu||-wwe
LF13741 - product/If13741?HQS=T|-nu|I-nuII-dscatalog-df-pf-nu||-wwe
