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WIDE BANDWIDTH SINGLE J-FET OPERATIONAL AMPLIFIERS
LF151
LF251 - LF351
WIDE BANDWIDTH
SINGLE J-FET OPERATIONAL AMPLIFIER
. INTERNALLY ADJUSTABLE INPUT OFFSET
VOLTAGE
. LOW INPUT BIAS AND OFFSET CURRENT
. OUTPUT SHORT-CIRCUIT PROTECTION
. HIGH INPUT IMPEDANCE J–FET INPUT
STAGE
. INTERNAL FREQUENCY COMPENSATION
. LATCH UP FREE OPERATION
N
DIP8
(Plastic Package)
D
SO8
(Plastic Micropackage)
. HIGH SLEW RATE : 16V/ m s (typ)
DESCRIPTION
These circuits are high speed J–FET input single
operationalamplifiers incorporating well matched, high
voltage J–FET and bipolar transistors in a monolithic
integrated circuit.
The devicesfeaturehigh slew rates, low input bias and
offset currents, and low offset voltage temperature
coefficient.
ORDER CODES
Part Number
Temperature
Package
ND
LF351
0 o C, +70 o C
•
•
LF251
–40 o C, +105 o C
•
•
LF151
–55 o C, +125 o C
•
•
PIN CONNECTIONS (top view)
1
8
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.
2
7
3
6
4
5
October 1997
1/9
. LOW POWER CONSUMPTION
. WIDE COMMON-MODE (UP TO V CC + )AND
DIFFERENTIAL VOLTAGE RANGE
311389602.002.png
LF151 - LF251 - LF351
SCHEMATIC DIAGRAM
V CC
Non-inve rting
input
Inve rting
input
100 W
200W
Output
100W
30k
8.2k
1.3k
35k
1.3k
35k
100W
V CC
Offse t Null1
Offs e t Null2
INPUT OFFSET VOLTAGE NULL CIRCUITS
LF3 5 1
N1
N2
100k W
V CC
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V CC
Supply Voltage - (note 1)
18
V
V i
Input Voltage - (note 3)
± 15
V
V id
Differential Input Voltage - (note 2)
30
V
P tot
Power Dissipation
680
mW
Output Short-circuit Duration - (note 4)
Infinite
T oper
Operating Free Air Temperature Range
LF351
LF251
LF151
0to70
–40 to 105
–55 to 125
o C
o C
Notes : 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 – .
2. Differential voltages are at the non-inverting input terminal with respect to the inverting input terminal.
3. The magnitude of the input voltage must never exceed the magnitude of the supply voltage or 15 volts, whichever is less.
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.
T stg
Storage Temperature Range
–65 to 150
2/9
±
±
311389602.003.png
LF151 - LF251 - LF351
ELECTRICAL CHARACTERISTICS
V CC =
± 15V, T amb =25 o C (unless otherwise specified)
Symbol
Parameter
LF151 - LF251 - LF351
Unit
Min.
Typ.
Max.
V io
Input Offset Voltage (R S = 10k
W
)
mV
3
10
13
3
T amb
3
T max.
DV io
Input Offset Voltage Drift
10
m
V/ o C
I io
Input Offset Current *
T amb =25 o C
T min.
5
100
4
pA
nA
3
T amb
3
T max.
I ib
Input Bias Current *
T amb =25 o C
T min.
20
200
20
pA
nA
3
T amb
3
T max.
A vd
Large Signal Voltage Gain (R L =2k
W
,V O =
10V)
V/mV
50
25
200
3
T amb
3
T max.
SVR
Supply Voltage Rejection Ratio (R S = 10k
W
)
dB
80
80
86
3
T amb
3
T max.
I CC
Supply Current (no load)
T amb =25 o C
T min.
mA
1.4
3.4
3.4
3
T amb
3
T max.
V icm
Input Common Mode Voltage Range
±
11
+15
-12
V
CMR
Common Mode Rejection Ratio (R S = 10k
W
)
dB
70
70
86
3
T amb
3
T max.
Ios
Output Short-circuit Current
T amb =25 o C
T min.
mA
10
10
40
60
60
3
T amb
3
T max.
±
V OPP Output Voltage Swing
T amb =25 o C
W
R L = 10k W
10
12
10
12
12
13.5
V
T min.
3
T amb
3
T max.
R L =2k W
R L = 10k
W
SR
Slew Rate
(V i = 10V, R L =2k
C L = 100pF, T amb =25 o C, unity gain)
V/
m
s
W,
12
16
t r
Rise Time
(V i = 20mV, R L =2k
,C L = 100pF, T amb =25 o C, unity gain)
m
s
W
0.1
K OV
Overshoot
(V i = 20mV, R L =2k
W
,C L = 100pF, T amb =25 o C, unity gain)
10
%
GBP
Gain Bandwidth Product
(f = 100kHz, T amb =25 o C, V in = 10mV, R L =2k
W
,C L =
100pF)
2.5
4
MHz
R i
Input Resistance
10 12
W
THD
Total Harmonic Distortion (f = 1kHz, A V = 20dB, R L =2k
W
,
%
0.01
Hz
j m Phase Margin 45 Degrees
* The input bias currents are junction leakage currents which approximately double for every 10 o C increase in the junction temperature.
e n
Equivalent Input Noise Voltage (f = 1kHz, R s = 100
W
)
15
nV
/```
3/9
T amb =25 o C
T min.
±
T amb =25 o C
T min.
T amb =25 o C
T min.
T amb =25 o C
T min.
R L =2k
C L = 100pF, T amb =25 o C, V O =2V PP )
311389602.004.png
LF151 - LF251 - LF351
MAXIMUM PEAK-TO-PEAK OUTPUT
VOLTAGE VERSUS FREQUENCY
MAXIMUM PEAK-TO-PEAK OUTPUT
VOLTAGE VERSUS FREQUENCY
30
30
=10k W
V CC
= 15V
R L
R L
=2k W
25
T amb
T amb
=+25 C
25
V CC = 15V
=+25 C
S e e F igure 2
S e e Figure 2
20
20
V CC
= 10V
V CC = 10V
15
15
10
V CC
= 5V
10
V CC = 5V
5
5
0
0
100
1K
10K
100K
1M
10M
100
1K
10K
100K
1M
10M
FREQUENCY (Hz)
FREQUENCY (Hz)
MAXIMUM PEAK-TO-PEAK OUTPUT
VOLTAGE VERSUS FREQUENCY
MAXIMUM PEAK-TO-PEAK OUTPUT
VOLTAGE VERSUS FREE AIR TEMP.
30
30
T amb =+25 C
V CC = 15V
25
R L =2k W
Se e Figure 2
25
20
20
15
15
R L =10k W
R L =2k W
T amb =-55 C
10
10
5
5
V CC = 15V
S e e Figu re 2
T amb =+125 C
0
0
10k
40k 100k
400k 1M
4M
10M
-75
-5 0
-2 5
0
25
50
75
-5 0
125
TE MP ER ATURE ( C)
FREQUENC Y (Hz)
MAXIMUM PEAK-TO-PEAK OUTPUT
VOLTAGE VERSUS LOAD RESISTANCE
MAXIMUM PEAK-TO-PEAK OUTPUT
VOLTAGE VERSUS SUPPLY VOLTAGE
30
30
V CC = 15V
S e e Figu re 2
25
20
T amb =+25 C
25
R L =10k W
T amb =+25 C
20
15
15
10
10
5
5
0
0.1 0.2
0.4
0.7 1 2
4
7 10
0
2
4
6
8
10
12 14
16
LOAD RES ISTANCE (k W )
S UP P LY VOLTAGE (V)
4/9
311389602.005.png
LF151 - LF251 - LF351
INPUT BIAS CURRENT VERSUS
FREE AIR TEMPERATURE
LARGE SIGNAL DIFFERENTIAL
VOLTAGE AMPLIFICATION VERSUS
FREE AIR TEMPERATURE
100
1000
400
200
100
V CC = 15V
10
1
40
20
V CC = 15V
10
4
2
1
0.1
V O = 10V
R L =2k W
0.01
-75 -50 -25 0 2 5 50 75 100 125
TEMPERATURE ( C )
-50 -25
0
25
50
75
100 125
TE MPERATURE ( C)
LARGE SIGNAL DIFFERENTIAL
VOLTAGE AMPLIFICATION AND PHASE
SHIFT VERSUS FREQUENCY
TOTAL POWER DISSIPATION VERSUS
FREE AIR TEMPERATURE
100
DIFF E RE NTIAL
VOLTAGE
AMPLIFICATION
(le ft s ca le )
180
250
225
200
175
150
100
75
50
25
0
V CC
+/-15 V
No s igna l
No loa d
P HASE S HIFT
(right sca le)
10
90
R= k W
C = 100pF
V= V
T= 5 C
1
L
L
CC
amb
0
100
1K
10K
100K
1M
10M
-75 -50 -25 0 25 50 75 100 125
TEMPERATURE ( C)
FREQUENC Y (Hz)
SUPPLY CURRENT PER AMPLIFIER
VERSUS FREE AIR TEMPERATURE
SUPPLY CURRENT PER AMPLIFIER
VERSUS SUPPLY VOLTAGE
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
V CC = 15V
No signa l
No loa d
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
T amb
= +25 C
No s igna l
No load
-75 -5 0 -25 0 25 50 75 100 125
TEMPERATURE ( C)
02 4 6 8 0 2 4 6
SUPPLY VOLTAGE (V)
5/9
311389602.001.png

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