LF411
Low Offset, Low Drift JFET Input Operational Amplifier
General Description
These devices are low cost, high speed, JFET input opera-
tional amplifiers with very low input offset voltage and guar-
anteed input offset voltage drift. They require low supply
current yet maintain a large gain bandwidth product and fast
slew rate. In addition, well matched high voltage JFET input
devices provide very low input bias and offset currents. The
LF411 is pin compatible with the standard LM741 allowing
designers to immediately upgrade the overall performance of
existing designs.
These amplifiers may be used in applications such as high
speed integrators, fast D/A converters, sample and hold
circuits and many other circuits requiring low input offset
voltage and drift, low input bias current, high input imped-
ance, high slew rate and wide bandwidth.
Features
n
Internally trimmed offset voltage:
0.5 mV(max)
n
Input offset voltage drift:
10 V/C(max)
n
Low input bias current:
50 pA
n
Low input noise current:
0.01 pA/
Hz
n
Wide gain bandwidth:
3 MHz(min)
n
High slew rate:
10V/s(min)
n
Low supply current:
1.8 mA
n
High input impedance:
10
12
n
Low total harmonic distortion:
0.02%
n
Low 1/f noise corner:
50 Hz
n
Fast settling time to 0.01%:
2 s
Typical Connection
Ordering Information
LF411XYZ
X indicates electrical grade
Y indicates temperature range
"M" for military
"C" for commercial
Z indicates package type
"H" or "N"
Connection Diagrams
BI-FET II
TM
is a trademark of National Semiconductor Corporation.
DS005655-1
Metal Can Package
DS005655-5
Note: Pin 4 connected to case.
Top View
Order Number LF411ACH
or LF411MH/883 (Note 11)
See NS Package Number H08A
Dual-In-Line Package
DS005655-7
Top View
Order Number LF411ACN, LF411CN
See NS Package Number N08E
August 2000
LF41
1
Low
Offset,
Low
Drift
JFET
Input
Operational
Amplifier
2001 National Semiconductor Corporation
DS005655
www.national.com
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
LF411A
LF411
Supply Voltage
22V
18V
Differential Input Voltage
38V
30V
Input Voltage Range
(Note 2)
19V
15V
Output Short Circuit
Duration
Continuous
Continuous
H Package
N Package
Power Dissipation
(Notes 3, 10)
670 mW
670 mW
H Package
N Package
T
j
max
150C
115C
j
A
162C/W (Still Air)
120C/W
65C/W (400 LF/min
Air Flow)
j
C
20C/W
Operating Temp.
Range
(Note 4)
(Note 4)
Storage Temp.
Range
-65C
T
A
150C
-65C
T
A
150C
Lead Temp.
(Soldering,
10 sec.)
260C
260C
ESD Tolerance
Rating to be determined.
DC Electrical Characteristics
(Note 5)
Symbol
Parameter
Conditions
LF411A
LF411
Units
Min
Typ
Max
Min
Typ
Max
V
OS
Input Offset Voltage
R
S
=10 k
, T
A
=25C
0.3
0.5
0.8
2.0
mV
V
OS
/
T
Average TC of Input
R
S
=10 k
(Note 6)
7
10
7
20
V/C
Offset Voltage
(Note 6)
I
OS
Input Offset Current
V
S
=
15V
T
j
=25C
25
100
25
100
pA
(Notes 5, 7)
T
j
=70C
2
2
nA
T
j
=125C
25
25
nA
I
B
Input Bias Current
V
S
=
15V
T
j
=25C
50
200
50
200
pA
(Notes 5, 7)
T
j
=70C
4
4
nA
T
j
=125C
50
50
nA
R
IN
Input Resistance
T
j
=25C
10
12
10
12
A
VOL
Large Signal Voltage
V
S
=
15V, V
O
=
10V,
50
200
25
200
V/mV
Gain
R
L
=2k, T
A
=25C
Over Temperature
25
200
15
200
V/mV
V
O
Output Voltage Swing
V
S
=
15V, R
L
=10k
12
13.5
12
13.5
V
V
CM
Input Common-Mode
16
+19.5
11
+14.5
V
Voltage Range
-16.5
-11.5
V
CMRR
Common-Mode
R
S
10k
80
100
70
100
dB
Rejection Ratio
PSRR
Supply Voltage
(Note 8)
80
100
70
100
dB
Rejection Ratio
I
S
Supply Current
1.8
2.8
1.8
3.4
mA
AC Electrical Characteristic
(Note 5)
Symbol
Parameter
Conditions
LF411A
LF411
Units
Min
Typ
Max
Min
Typ
Max
SR
Slew Rate
V
S
=
15V, T
A
=25C
10
15
8
15
V/s
GBW
Gain-Bandwidth Product
V
S
=
15V, T
A
=25C
3
4
2.7
4
MHz
e
n
Equivalent Input Noise Voltage
T
A
=25C, R
S
=100
,
f=1 kHz
25
25
i
n
Equivalent Input Noise Current
T
A
=25C, f=1 kHz
0.01
0.01
THD
Total Harmonic Distortion
A
V
=+10, R
L
=10k,
V
O
=20 Vp-p,
BW=20 Hz-20 kHz
<
0.02
<
0.02
%
LF41
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2
AC Electrical Characteristic
(Note 5) (Continued)
Note 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 guarantee specific performance limits.
Note 2: Unless otherwise specified the absolute maximum negative input voltage is equal to the negative power supply voltage.
Note 3: For operating at elevated temperature, these devices must be derated based on a thermal resistance of
j
A.
Note 4: These devices are available in both the commercial temperature range 0C
T
A
70C and the military temperature range -55C
T
A
125C. The
temperature range is designated by the position just before the package type in the device number. A "C" indicates the commercial temperature range and an "M"
indicates the military temperature range. The military temperature range is available in "H" package only.
Note 5: Unless otherwise specified, the specifications apply over the full temperature range and for V
S
=
20V for the LF411A and for V
S
=
15V for the LF411. V
OS
,
I
B
, and I
OS
are measured at V
CM
=0.
Note 6: The LF411A is 100% tested to this specification. The LF411 is sample tested to insure at least 90% of the units meet this specification.
Note 7: The input bias currents are junction leakage currents which approximately double for every 10C increase in the junction temperature, T
j
. Due to limited
production 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, P
D
. T
j
=T
A
+
jA
P
D
where
jA
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 8: Supply voltage rejection ratio is measured for both supply magnitudes increasing or decreasing simultaneously in accordance with common practice, from
15V to
5V for the LF411 and from
20V to
5V for the LF411A.
Note 9: RETS 411X for LF411MH and LF411MJ military specifications.
Note 10: Max. Power Dissipation is defined by the package characteristics. Operating the part near the Max. Power Dissipation may cause the part to operate
outside guaranteed limits.
Typical Performance Characteristics
Input Bias Current
DS005655-11
Input Bias Current
DS005655-12
Supply Current
DS005655-13
Positive Common-Mode
Input Voltage Limit
DS005655-14
Negative Common-Mode
Input Voltage Limit
DS005655-15
Positive Current Limit
DS005655-16
LF41
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Typical Performance Characteristics
(Continued)
Negative Current Limit
DS005655-17
Output Voltage Swing
DS005655-18
Output Voltage Swing
DS005655-19
Gain Bandwidth
DS005655-20
Bode Plot
DS005655-21
Slew Rate
DS005655-22
Distortion vs Frequency
DS005655-23
Undistorted Output
Voltage Swing
DS005655-24
Open Loop Frequency
Response
DS005655-25
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Typical Performance Characteristics
(Continued)
Pulse Response
R
L
=2 k
, C
L
10 pF
Common-Mode Rejection
Ratio
DS005655-26
Power Supply
Rejection Ratio
DS005655-27
Equivalent Input Noise
Voltage
DS005655-28
Open Loop Voltage Gain
DS005655-29
Output Impedance
DS005655-30
Inverter Settling Time
DS005655-31
Small Signal Inverting
DS005655-39
Small Signal Non-Inverting
DS005655-40
LF41
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