1/9
s
INTERNALLY ADJUSTABLE INPUT OFFSET
VOLTAGE
s
LOW POWER CONSUMPTION
s
WIDE COMMON-MODE (UP TO V
CC
+
) AND
DIFFERENTIAL VOLTAGE RANGE
s
LOW INPUT BIAS AND OFFSET CURRENT
s
OUTPUT SHORT-CIRCUIT PROTECTION
s
HIGH INPUT IMPEDANCE JFET INPUT
STAGE
s
INTERNAL FREQUENCY COMPENSATION
s
LATCH UP FREE OPERATION
s
HIGH SLEW RATE : 16V/
s (typ)
DESCRIPTION
These circuits are high speed JFET input single-
operational amplifiers incorporating well matched,
high voltage JFET and bipolar transistors in a
monolithic integrated circuit.
The devices feature high slew rates, low input bias
and offset currents, and low offset voltage temper-
ature coefficient.
ORDER CODE
N = Dual in Line Package (DIP)
D = Small Outline Package (SO) - also available in Tape & Reel (DT)
PIN CONNECTIONS (top view)
Part Number
Temperature Range
Package
N
D
LF351
0C, +70C
LF251
-40C, +105C
LF151
-55C, +125C
N
DIP8
(Plastic Package)
D
SO8
(Plastic Micropackage)
1
2
3
4
8
6
5
7
1 - Offset null 1
2 - Inverting input
3 - Non-inverting input
4 - V
CC
-
5 - Offset null 2
6 - Output
7 - V
CC
+
8 - N.C.
LF151
LF251 - LF351
WIDE BANDWIDTH
SINGLE J-FET OPERATIONAL AMPLIFIER
March 2001
LF151 - LF251 - LF351
2/9
SCHEMATIC DIAGRAM
INPUT OFFSET VOLTAGE NULL CIRCUIT
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
LF151
LF251
LF351
Unit
V
CC
Supply voltage - note
1)
1.
All voltage values, except differential voltage, are with respect to the zero reference level (ground) of the supply voltages where the zero reference
level is the midpoint between V
CC
+
and V
CC
-
.
18
V
V
i
Input Voltage - note
2)
2.
The magnitude of the input voltage must never exceed the magnitude of the supply voltage or 15 volts, whichever is less.
15
V
V
id
Differential Input Voltage - note
3)
3.
Differential voltages are the non-inverting input terminal with respect to the inverting input terminal.
30
V
P
tot
Power Dissipation
680
mW
Output Short-circuit Duration - note
4)
4.
The output may be shorted to ground or to either supply. Temperature and/or supply voltages must be limited to ensure that the dissipation rating
is not exceeded
Infinite
T
oper
Operating Free-air Temperature Range
-55 to +125
-40 to +105
0 to +70
C
T
stg
Storage Temperature Range
-65 to +150
C
LF151 - LF251 - LF351
3/9
ELECTRICAL CHARACTERISTICS
V
CC
= 15V, T
amb
= +25C (unless otherwise specified)
MAXIMUM PEAK-TO-PEAK OUTPUT
Symbol
Parameter
Min.
Typ.
Max.
Unit
V
io
Input Offset Voltage (R
s
=
10k
)
T
amb
= +25C
T
min
T
amb
T
max
3
10
13
mV
DV
io
Input Offset Voltage Drift
10
V/C
I
io
Input Offset Current- note
1)
T
amb
= +25C
T
min
T
amb
T
max
1.
The input bias currents are junction leakage currents which approximately double for every 10C increase in the junction temperature.
5
100
4
pA
nA
I
ib
Input Bias Current -note 1
T
amb
= +25C
T
min
T
amb
T
max
20
200
20
nA
A
vd
Large Signal Voltage Gain
(
R
L
= 2k
, V
o
= 10V)
T
amb
= +25C
T
min
T
amb
T
max
50
25
200
V/mV
SVR
Supply Voltage Rejection Ratio (R
S
=
10k
)
T
amb
= +25C
T
min
T
amb
T
max
80
80
86
dB
I
CC
Supply Current, no load
T
amb
= +25C
T
min
T
amb
T
max
1.4
3.4
3.4
mA
V
icm
Input Common Mode Voltage Range
11
+15
-12
V
CMR
Common Mode Rejection Ratio (R
S
=
10k
)
T
amb
= +25C
T
min
T
amb
T
max
70
70
86
dB
I
OS
Output Short-circuit Current
T
amb
= +25C
T
min
T
amb
T
max
10
10
40
60
60
mA
V
opp
Output Voltage Swing
T
amb
= +25C
R
L
= 2k
R
L
= 10k
T
min
T
amb
T
max
R
L
= 2k
R
L
= 10k
10
12
10
12
12
13.5
V
SR
Slew Rate
V
i
= 10V, R
L
= 2k
, C
L
= 100pF, T
amb
= +25C, unity gain
12
16
V/
s
t
r
Rise Time
V
i
= 20mV, R
L
= 2k
, C
L
= 100pF, T
amb
= +25C, unity gain
0.1
s
K
ov
Overshoot
V
i
= 20mV, R
L
= 2k
, C
L
= 100pF, T
amb
= +25C, unity gain
10
%
GBP
Gain Bandwidth Product
f = 100kHz, T
amb
= +25C,V
in
= 10mV, R
L
= 2k
, C
L
= 100pF
2.5
4
MHz
R
i
Input Resistance
10
12
THD
Total Harmonic Distortion ( f = 1kHz, A
v
= 20dB
R
L
= 2k
,
C
L
= 100pF, T
amb
= +25C,V
o
= 2V
pp
)
0.01
e
n
Equivalent Input Noise Voltage
R
S
=
100
,
f = 1KHz
15
m
Phase Margin
45
Degrees
nV
Hz
------------
LF151 - LF251 - LF351
4/9
VOLTAGE versus FREQUENCY
MAXIMUM PEAK-TO-PEAK OUTPUT
VOLTAGE versus FREQUENCY
MAXIMUM PEAK-TO-PEAK OUTPUT
VOLTAGE versus LOAD RESISTANCE
MAXIMUM PEAK-TO-PEAK OUTPUT
VOLTAGE versus FREQUENCY
MAXIMUM PEAK-TO-PEAK OUTPUT
VOLTAGE versus FREE AIR TEMP.
MAXIMUM PEAK-TO-PEAK OUTPUT
VOLTAGE versus SUPLY VOLTAGE
INPUT BIAS CURRENT versus FREE AIR
LF151 - LF251 - LF351
5/9
TEMPERATURE
LARGE SIGNAL DIFFERENTIAL VOLTAGE
AMPLIFICATION AND PHASE SHIFT versus
FREQUENCY
SUPPLY CURRENT PER AMPLIFIER versus
FREE AIR TEMPERATURE
LARGE SIGNAL DIFFERENTIAL VOLTAGE
AMPLIFICATION versus FREE AIR TEMP.
TOTAL POWER DISSIPATION versus FREE AIR
TEMPERATURE
SUPPLY CURRENT PER AMPLIFIER versus
SUPPLY VOLTAGE
COMMON MODE REJECTION RATIO versus
LF151 - LF251 - LF351
6/9
FREE AIR TEMPERATURE
OUTPUT VOLTAGE versus ELAPSED TIME
VOLTAGE FOLLOWER LARGE SIGNAL PULSE
RESPONSE
EQUIVALENT INPUT NOISE VOLTAGE versus
FREQUENCY
TOTAL HARMONIC DISTORTION versus FREQUENCY
LF151 - LF251 - LF351
7/9
PARAMETER MEASUREMENT INFORMATION
Figure 1 : Voltage Follower
Figure 2 : Gain-of-10 inverting amplifier
TYPICAL APPLICATION
(0.5Hz) SQUARE WAVE OSCILLATOR
HIGH Q NOTCH FILTER
LF151 - LF251 - LF351
8/9
PACKAGE MECHANICAL DATA
8 PINS - PLASTIC DIP
Dim.
Millimeters
Inches
Min.
Typ.
Max.
Min.
Typ.
Max.
A
3.32
0.131
a1
0.51
0.020
B
1.15
1.65
0.045
0.065
b
0.356
0.55
0.014
0.022
b1
0.204
0.304
0.008
0.012
D
10.92
0.430
E
7.95
9.75
0.313
0.384
e
2.54
0.100
e3
7.62
0.300
e4
7.62
0.300
F
6.6
0260
i
5.08
0.200
L
3.18
3.81
0.125
0.150
Z
1.52
0.060
LF151 - LF251 - LF351
9/9
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from
its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics
2001 STMicroelectronics - Printed in Italy - All Rights Reserved
STMicroelectronics GROUP OF COMPANIES
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http://www.st.com
PACKAGE MECHANICAL DATA
8 PINS - PLASTIC MICROPACKAGE (SO)
Dim.
Millimeters
Inches
Min.
Typ.
Max.
Min.
Typ.
Max.
A
1.75
0.069
a1
0.1
0.25
0.004
0.010
a2
1.65
0.065
a3
0.65
0.85
0.026
0.033
b
0.35
0.48
0.014
0.019
b1
0.19
0.25
0.007
0.010
C
0.25
0.5
0.010
0.020
c1
45 (typ.)
D
4.8
5.0
0.189
0.197
E
5.8
6.2
0.228
0.244
e
1.27
0.050
e3
3.81
0.150
F
3.8
4.0
0.150
0.157
L
0.4
1.27
0.016
0.050
M
0.6
0.024
S
8 (max.)
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