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LF157N-LF255D-LF255N-LF256D-LF256N-LF257D-LF355D-LF356D-LF356N-LF357D-LF357N
WIDE BANDWIDTH SINGLE J-FET OPERATIONAL AMPLIFIERS
- Offset Null2- Output VCC+- N.C.WIDE BANDWIDTH
SINGLE J-FET OPERATIONAL AMPLIFIERS HIGH INPUT IMPEDANCE J-FET INPUT
STAGE. HIGH SPEED J-FET OP-AMPs: upto 20MHz,
50V/μs. OFFSET VOLTAGEADJUSTMENT DOESNOT
DEGRADE DRIFT OR COMMON-MODE
REJECTION ASIN MOST OF MONOLITHIC
AMPLIFIERS. INTERNAL COMPENSATION AND LARGE
DIFFERENTIAL INPUT VOLTAGECAPABILITY
(UP TO VCC+)
TYPICAL APPLICATIONS. PRECISION HIGH SPEED INTEGRATORS. FAST D/A AND CONVERTERS. HIGH IMPEDANCE BUFFERS. WIDEBAND, LOW NOISE, LOW DRIFT
AMPLIFIERS. LOGARITHIMIC AMPLIFIERS. PHOTOCELL AMPLIFIERS. SAMPLE AND HOLD CIRCUITS
DIP8(Plastic Package)- Offset Null1- Inverting input- Non-inverting input VCC-
PIN CONNECTIONS (top view)
DESCRIPTIONThese circuits are monolithic J-FET input operational
amplifiers incorporating well matched,high voltage
J-FETon the same chip with standard bipolar transis-
tors.
This amplifiers feature low input bias and offset cur-
rents, low input offsetvoltage and input offset voltage
drift,coupledwith offsetadjust whichdoesnotdegrade
driftor common-mode rejection.
The devicesare also designed forhigh slewrate,wide
bandwidth,extremelyfastsettlingtime,lowvoltageand
current noise anda low1/f noise level.
LF155-LF255-LF355
LF156-LF256-LF356
LF157-LF257-LF357July 1998
SO8(Plastic Micropackage)
ORDER CODES
Part Number Temperature
Range
PackageLF355, LF356, LF357 0oC, +70oC ••
LF255, LF256, LF257 –40oC, +105oC ••
LF155, LF156, LF157 –55oC, +125oC ••
Example: LF355N
1/14
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value UnitVCC Supply Voltage ±22 V Input Voltage- (note1) ±20 V
Vid Differential Input Voltage ±40 V
Ptot Power Dissipation 570 mW
Output Short-circuit Duration Infinite
Toper Operating FreeAir Temperature Range LF155-LF156-LF157
LF255-LF256-LF257
LF355-LF356-LF357
-55to +125
–40to +105
0to70C
Tstg Storage Temperature Range –65to 150 oC
SCHEMATIC DIAGRAM
Vio ADJUSTMENT
LF155- LF156- LF1572/14
ELECTRICAL CHARACTERISTICS
LF155, LF156, LF157 -55oC≤ Tamb≤ +125oC ±5V ≤ VCC ≤ ±20V
LF255, LF256, LF257 -40oC≤ Tamb≤ +105oC ±5V ≤ VCC ≤ ±20V
(unless otherwise specified)
Symbol Parameter
LF155- LF156- LF157
LF255- LF256- LF257 Unit
Min. Typ. Max.Vio Input Offset Voltage (RS =50Ω)
Tamb =25oC
Tmin.≤ Tamb≤ Tmax. LF155, LF156, LF157
LF255, LF256, LF257
Iio Input Offset Current- (note3)
Tamb =25oC
Tmin.≤ Tamb≤ Tmax. LF155, LF156, LF157
LF255, LF256, LF257
Iib Input Bias Current- (note3)
Tamb =25oC
Tmin.≤ Tamb≤ Tmax. LF155, LF156, LF157
LF255, LF256, LF257 100
Avd Large Signal Voltage Gain (RL =2kΩ,VO= ±10V, VCC= ±15V)
Tamb =25oC
Tmin.≤ Tamb≤ Tmax.
V/mV
SVR Supply Voltage Rejection Ratio- (note4) 85 100 dB
ICC Supply Current (VCC= ±15V,no load)
Tamb =25oC LF155, LF255
LF156, LF256
LF157, LF257
DVio Input Offset Voltage Drift (RS =50Ω)5 μV/oC
DVio/Vio Changein Average Temperature Coefficient withVio adjust
(RS =50Ω)- (note2)
0.5 μV/oC
Vicm Input Common Mode Voltage Range (VCC= ±15V, Tamb =25oC) ±11 +15.1
CMR Common Mode Rejection Ratio 85 100 dB
±VOPP Output Voltage Swing (VCC= ±15V)= 10kΩ =2kΩ
±12
±10
±13
±12
GBP Gain Bandwidth Product (VCC= ±15V, Tamb =25oC)
LF155, LF255
LF156, LF256
LF157, LF257
MHz Slew Rate (VCC= ±15V, Tamb =25oC)=1 LF155, LF255
LF156, LF256=5 LF157, LF257
V/μs Input Resistance (Tamb =25oC) 1012 Ω Input Capacitance (VCC= ±15V, Tamb =25oC) 3 pF Equivalent Input Noise Voltage
(VCC= ±15V, Tamb =25oC,RS= 100Ω)= 1000Hz LF155, LF255
LF156, LF256
LF157, LF257= 100Hz LF155, LF255
LF156, LF256
LF157, LF257Hz Equivalent Input Noise Current
(VCC= ±15V, Tamb =25oC,f= 100Hzorf= 1000Hz) 0.01 pAHz Settling Time (VCC= ±15V, Tamb =25oC)- (note5)
LF155, LF255
LF156, LF256
LF157, LF257
LF155- LF156- LF157
3/14
Notes:1. Unless otherwise specifiedthe absolute maximum negative inputvoltageis equal tothe negative power supply voltage. The temperature coefficientofthe adjusted input offset voltage changes onlya small amount (0.5μV/oC typically) foreachmV adjustment fromits original unadjusted value. Common-mode rejectionandopenloop voltagegain arealsounaffectedby
offset adjustment. The input bias currentsare junction leakage currents which approximately doublefor every10oC increasein thejunction
temperature Tamb. Duetolimitedproduction test time,the inputbias currentmeasuredis correlatedto junction temperature. anormal operation thejunction temperature rises above theambient temperature asa resultof internal power dissipation,
Ptot-Tamb =Tamb+Rth(j-a)xPtotwhere Rth(j-a)isthe thermal resistance from junction toambient. Useofa heatsink isrecommended inputcurrents areto bekepttoa minimum. Supply voltage rejectionis measuredfor both supply magnitudes increasingor decreasing simultaneously,in accordance with
commonpractise. Settlingtimeis defined here,fora unity gain inverter connection using 2kΩ resistorsforthe LF155, LF156 series.Itis thetime
requiredforthe errorvoltage(the voltage atthe inverting inputpinon theamplifier)to settleto within0.01%ofits finalvalue from
the timea 10V step inputis appliedtothe inverter.Forthe LF157 seriesAV=-5, thefeedback resistor from outputto inputis 2kΩ
andtheoutput stepis 10V.
ELECTRICAL CHARACTERISTICS
LF355, LF356, LF357 0oC≤ Tamb≤ +70o CVCC= ±15V, (unless otherwise specified)
Symbol Parameter LF355- LF356- LF357 UnitMin. Typ. Max.Vio Input Offset Voltage (RS =50Ω)
Tamb =25oC
Tmin.≤ Tamb≤ Tmax.
Iio Input Offset Current- (note3)
Tamb =25oC
Tmin.≤ Tamb≤ Tmax.
Iib Input Bias Current- (note3)
Tamb =25oC
Tmin.≤ Tamb≤ Tmax. 200
Avd Large Signal Voltage Gain (RL =2kΩ,VO= ±10V)
Tamb =25oC
Tmin.≤ Tamb≤ Tmax.
V/mV
SVR Supply Voltage Rejection Ratio- (note4) 80 100 dB
ICC Supply Current (no load)
Tamb =25oC LF355
LF356, LF357
DVio Input Offset Voltage Drift (RS =50Ω)- (note2) 5 μV/oC
DVio/Vio Changein Average Temperature Coefficient withVio adjust
(RS =50Ω)
0.5 μV/oC
per mV
Vicm Input Common Mode Voltage Range (Tamb =25oC) ±10 +15.1
CMR Common Mode Rejection Ratio 80 100 dB
±VOPP Output Voltage Swing RL= 10kΩ =2kΩ
±12
±10
±13
±12
GBP Gain Bandwidth Product Tamb =25oC) LF355
LF356
LF357
MHz Slew Rate (Tamb =25oC)=1 LF355
LF356=5 LF357
V/μs Input Resistance (Tamb =25oC) 1012 Ω Input Capacitance (Tamb=25oC) 3 pF Equivalent Input Noise Voltage (Tamb =25oC,RS= 100Ω)= 1000Hz LF355
LF356, LF357= 100Hz LF355
LF356, LF357Hz Equivalent Input Noise Current
(Tamb =25oC,f= 100Hzorf= 1000Hz) 0.01 pAHz Settling Time (Tamb =25oC)- (note5) LF355
LF356, LF357
LF155- LF156- LF157
4/14
The LF155, LF156, LF157 series areop ampswithJ-
FETinput transistors. TheseJFETs havelarge reverse
breakdown voltagesfromgatetosourceor drain elimi-
natingtheneed ofclampsacrossthe inputs.Therefore
large differential input voltagescan easilybe accom-
modatedwithoutalarge increaseof inputcurrents.The
maximum differential input voltageis independentof
thesupplyvoltage.However,neitherof thenegativein-
put voltagesshouldbe allowedto exceedthenegative
supplyas this will cause large currentsto flow which
canresultina destroyedunit. Exceeding the negative
common-modelimit oneitherinputwillcauseareversal thephasetotheoutputandforce the amplifier output the correspondinghighor lowstate. Exceedingthe
negativecommon-mode limit on bothinputs will force
theamplifieroutputtoa highstate.Inneithercasedoes latch occur since raising the input back within the
common-mode rangeagain puts theinput stage and
thustheamplifierina normal operatingmode. Exceed-
ingthepositivecommon-modelimit onasingleinputwill
not changethephaseof the output however,if bothin-
putsexceedthelimit, theoutputof theamplifier willbe
forcedtoahighstate.Theseamplifierswill operatewith
the common-modeinput voltageequalto the positive
supply. In fact, the common-modevoltagecanex-
ceedthepositivesupplybyapproximately100mVinde-
pendentof supply volt-age and over thefull operat-
ingtemperaturerange.The positive suplly can there-
forebe used asareferenceonaninputas, forexample, asupply currentmonitor and/orlimiter. Precautions-
shouldbe takentoensurethatthepowersupply forthe
integratedcircuit neverbecomesre-versedin polarity
orthatthe unit isnotinadvertentlyin-stalledbackwardsa socketasan unilimited current surge throughthe
resultingforward diode within theIC couldcausefusin-
goftheinternalconductorsandresultina destroyedunit.
Becausetheseamplifiers are JFET ratherthan MOS-
FET inputop amps theydo not require special han-
dling.
Allofthebiascurrentsintheseamplifiersaresetby FET
current sources. The drain currentsfor the amplifiers
are therefore essentially independentof supply volt-
ages.
Aswith most amplifiers, care should betakenwith lead
dress, componentsplacement and supply decoupling
inorderto ensurestability. Forexample, resistors from
theoutputtoan input shouldbe placedwith thebody
closeto theinputtominimiz ”pickup”andmaximize the
frequencyof the feedbackpoleby minimizing the ca-
pacitancefromthe inputto ground. feedback poleis createdwhen the feedbackaround
any amplifieris resistive. The parallel resistance and
capacitancefromtheinputof thedevice(usuallythein-
vertinginput)toacgroundsetthefrequencyofthepole.In
many instances the frequencyof this poleis much
greaterthanthe expected3 dBfrequencyof the closed
loopgainandconsequentlythereisnegligible effecton
stability margin. However,if the feedback poleis less
than approximately six time the expected3 dB fre-
quencyaleadcapacitorshould beplaced from the out-
putto theinputof theop amp.Thevalue ofthat added
capacitorshouldbe such that the RC time constantof
this capacitorand the resistanceit parallelsis greater
thanor equalto the original feedbackpole time con-
stant.
APPLICATION HINTS
LF155- LF156- LF1575/14
LF155- LF156- LF1576/14
LF155- LF156- LF1577/14
