LF151
LF251 - LF351
WIDE BANDWIDTH
SINGLE J-FET OPERATIONAL AMPLIFIER
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 J–FET INPUT
STAGE
N
DIP8
(Plastic Package)
s
INTERNAL FREQUENCY COMPENSATION
s
LATCH UP FREE OPERATION
s
HIGH SLEW RATE : 16V/µs (typ)
D
SO8
(Plastic Micropackage)
DESCRIPTION
These circuits are high speed J–FET input single-
operational amplifiers incorporating well matched,
high voltage J–FET 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.
PIN CONNECTIONS
(top view)
ORDER CODE
Package
Part Number
LF351
LF251
LF151
Temperature Range
N
0°C, +70°C
-40°C, +105°C
-55°C, +125°C
•
•
•
D
•
•
•
N =
Dual in Line Package (DIP)
D =
Small Outline Package (SO) - also available in Tape & Reel (DT)
1
2
3
4
8
7
6
5
1-
2-
3-
4-
5-
6-
7-
8-
Offset null 1
Inverting input
Non-inverting input
V
CC-
Offset null 2
Output
V
CC+
N.C.
March 2001
1/9
LF151 - LF251 - LF351
SCHEMATIC DIAGRAM
INPUT OFFSET VOLTAGE NULL CIRCUIT
ABSOLUTE MAXIMUM RATINGS
Symbol
V
CC
V
i
V
id
P
tot
T
oper
T
stg
1.
2.
3.
4.
Parameter
Supply voltage - note
1)
Input Voltage - note
2)
Differential Input Voltage - note
3)
Power Dissipation
Output Short-circuit Duration - note
4)
Operating Free-air Temperature Range
Storage Temperature Range
LF151
LF251
LF351
Unit
V
V
V
mW
±18
±15
±30
680
Infinite
-55 to +125
-40 to +105
-65 to +150
0 to +70
°C
°C
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 -
.
The magnitude of the input voltage must never exceed the magnitude of the supply voltage or 15 volts, whichever is less.
Differential voltages are the non-inverting input terminal with respect to the inverting input terminal.
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
2/9
LF151 - LF251 - LF351
ELECTRICAL CHARACTERISTICS
V
CC
= ±15V, T
amb
= +25°C (unless otherwise specified)
Symbol
V
io
DV
io
I
io
Parameter
Input Offset Voltage (R
s
=
10kΩ)
T
amb
= +25°C
T
min
≤
T
amb
≤
T
max
Input Offset Voltage Drift
Input Offset Current- note
1)
T
amb
= +25°C
T
min
≤
T
amb
≤
T
max
Input Bias Current -note 1
T
amb
= +25°C
T
min
≤
T
amb
≤
T
max
Large Signal Voltage Gain
(R
L
= 2kΩ, V
o
= ±10V)
T
amb
= +25°C
T
min
≤
T
amb
≤
T
max
Supply Voltage Rejection Ratio (R
S
=
10kΩ)
T
amb
= +25°C
T
min
≤
T
amb
≤
T
max
Supply Current, no load
T
amb
= +25°C
T
min
≤
T
amb
≤
T
max
Input Common Mode Voltage Range
Common Mode Rejection Ratio (R
S
=
10kΩ)
T
amb
= +25°C
T
min
≤
T
amb
≤
T
max
Output Short-circuit Current
T
amb
= +25°C
T
min
≤
T
amb
≤
T
max
Output Voltage Swing
T
amb
= +25°C
±V
opp
T
min
≤
T
amb
≤
T
max
R
L
=
R
L
=
R
L
=
R
L
=
2kΩ
10kΩ
2kΩ
10kΩ
±11
50
25
80
80
Min.
Typ.
3
10
5
100
4
200
20
V/mV
200
dB
86
Max.
10
13
µV/°C
pA
nA
nA
20
Unit
mV
I
ib
A
vd
SVR
I
CC
V
icm
CMR
1.4
+15
-12
86
3.4
3.4
mA
V
dB
70
70
10
10
10
12
10
12
12
mA
40
60
60
V
12
13.5
I
OS
SR
t
r
K
ov
GBP
R
i
Slew Rate
V
i
= 10V, R
L
= 2kΩ, C
L
= 100pF, T
amb
= +25°C, unity gain
Rise Time
V
i
= 20mV, R
L
= 2kΩ, C
L
= 100pF, T
amb
= +25°C, unity gain
Overshoot
V
i
= 20mV, R
L
= 2kΩ, C
L
= 100pF, T
amb
= +25°C, unity gain
Gain Bandwidth Product
f = 100kHz, T
amb
= +25°C,V
in
= 10mV, R
L
= 2kΩ, C
L
= 100pF
Input Resistance
V/µs
16
µs
0.1
%
10
MHz
2.5
4
10
12
0.01
15
45
nV
-----------
-
Hz
Degrees
Ω
THD
e
n
∅m
1.
Total Harmonic Distortion ( f = 1kHz, A
v
= 20dB
R
L
= 2kΩ, C
L
= 100pF, T
amb
= +25°C,V
o
= 2V
pp
)
Equivalent Input Noise Voltage
R
S
=
100Ω, f = 1KHz
Phase Margin
The input bias currents are junction leakage currents which approximately double for every 10°C increase in the junction temperature.
MAXIMUM PEAK-TO-PEAK OUTPUT
3/9
LF151 - LF251 - LF351
VOLTAGE versus FREQUENCY
VOLTAGE versus FREQUENCY
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 LOAD RESISTANCE
MAXIMUM PEAK-TO-PEAK OUTPUT
VOLTAGE versus SUPLY VOLTAGE
MAXIMUM PEAK-TO-PEAK OUTPUT
4/9
INPUT BIAS CURRENT versus FREE AIR
LF151 - LF251 - LF351
TEMPERATURE
AMPLIFICATION versus FREE AIR TEMP.
LARGE SIGNAL DIFFERENTIAL VOLTAGE
AMPLIFICATION AND PHASE SHIFT versus
FREQUENCY
TOTAL POWER DISSIPATION versus FREE AIR
TEMPERATURE
SUPPLY CURRENT PER AMPLIFIER versus
FREE AIR TEMPERATURE
SUPPLY CURRENT PER AMPLIFIER versus
SUPPLY VOLTAGE
LARGE SIGNAL DIFFERENTIAL VOLTAGE
COMMON MODE REJECTION RATIO versus
5/9
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