LF351
Wide bandwidth single JFET operational amplifiers
Features
■
■
■
■
■
■
■
■
■
Internally adjustable input offset voltage
Low power consumption
Wide common-mode (up to V
CC
+
) and differential voltage range
Low input bias and offset current
Output short-circuit protection
High input impedance JFET input stage
Internal frequency compensation
Latch up free operation
High slew rate 16 V/µs (typical)
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 temperature coefficient.
N
DIP8
(Plastic package)
D
SO-8
(Plastic micro package)
Pin connections
(top view)
1
2
3
4
8
7
6
5
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.
April 2008 Rev 2 1/14 www.st.com
14
Schematics
1 Schematics
Figure 1.
Schematic diagram
V
CC
Non-inverting input
Inverting input
100
W
200
W
30k
100
W
Output
1.3k
35k 1.3k
35k 100
W
V
CC
Offset Null1 Offset Null2
Figure 2.
Input offset voltage null circuit
8.2k
LF351
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LF351
2
Absolute maximum ratings and operating conditions
Absolute maximum ratings and operating conditions
Table 1.
Symbol
V
CC
V i
V id
R thja
R thjc
T stg
ESD
Absolute maximum ratings
Parameter
Supply voltage
(1)
Input voltage
(2)
Differential input voltage
(3)
Thermal resistance junction to ambient
(4)
SO-8
DIP8
Thermal resistance junction to case
(4)
SO-8
DIP8
Output short-circuit duration
(5)
Storage temperature range
HBM: human body model
(6)
MM: machine model
(7)
CDM: charged device model
(8)
Value
±18
±15
±30
125
85
40
41
Infinite
-65 to +150
500
200
1.5
Unit
V
V
V
°C/W
°C/W
°C
V
V kV
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.
The magnitude of the input voltage must never exceed the magnitude of the supply voltage or 15 volts, whichever is less.
3.
Differential voltages are the non-inverting input terminal with respect to the inverting input terminal.
4.
Short-circuits can cause excessive heating and destructive dissipation. Values are typical.
5.
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
6.
Human body model: A 100 pF capacitor is charged to the specified voltage, then discharged through a 1.5 k
Ω resistor between two pins of the device. This is done for all couples of connected pin combinations while the other pins are floating.
7.
Machine model: A 200 pF capacitor is charged to the specified voltage, then discharged directly between two pins of the device with no external series resistor (internal resistor < 5
Ω
). This is done for all couples of connected pin combinations while the other pins are floating.
8.
Charged device model: all pins and the package are charged together to the specified voltage and then discharged directly to the ground through only one pin. This is done for all pins.
Table 2.
Symbol
V
CC
T oper
Operating conditions
Parameter
Supply voltage
Operating free-air temperature range
LF151 LF251
6 to 32
-55 to +125 -40 to +105
LF351
0 to +70
Unit
V
°C
3/14
Electrical characteristics LF351
Table 3.
Electrical characteristics at V
CC
= ±15 V, T amb
= +25°C (unless otherwise specified)
Parameter Min. Typ. Max.
Unit Symbol
DV
SVR
I
V
I
I
A io io ib io vd
CC
Input offset voltage (R s
= 10k Ω )
T min
≤ T amb
≤ max
Input offset voltage drift
Input offset current
(1)
T min
≤ T amb
≤ max
Input bias current
(1)
T min
≤ T amb
≤ max
Large signal voltage gain ( R
L
= 2k Ω , V o
= ±10V)
T min
≤ T amb
≤ max
Supply voltage rejection ratio (R
S
= 10k Ω)
T min
≤
T amb
≤ max
Supply current, no load
T min
≤
T amb
≤ max
50
25
80
80
3
10
5
20
200
86
1.4
10
13
100
4
200
20
3.4
3.4
mV
µV/°C pA nA pA nA
V/mV dB mA
V icm
Input common mode voltage range
±11 +15
-12
V
CMR
I
OS
Common mode rejection ratio (R
S
= 10k Ω)
T min
≤ T amb
≤ max
Output short-circuit current
T min
≤ T amb
≤ T max
±V opp
Output voltage swing
T
R
L
R
L
= 2k Ω
= 10k Ω min
≤ amb
≤ max
R
L
R
L
= 2k Ω
= 10k Ω
SR t r
Slew rate, V i
= 10V, R
L
= 2k Ω , C
L
= 100pF, unity gain
Rise time, V i
= 20mV, R
L
= 2k Ω , C
L
= 100pF, unity gain
K ov
Overshoot, V i
= 20mV, R
L
= 2k Ω , C
L
= 100pF, unity gain
GBP Gain bandwidth product, f = 100kHz, V in
= 10mV, R
L
= 2k
Ω
, C
L
= 100pF
R i
Input resistance
THD e
∅ n m
Total harmonic distortion f= 1kHz, A v
= 20dB, R
L
= 2k Ω, C
L
=100pF, V o
= 2V pp
Equivalent input noise voltage
R
S
= 100 Ω, f = 1KHz
Phase margin
70
70
10
10
10
12
10
12
12
2.5
86
40
12
13.5
16
0.1
10
4
10
12
0.01
15
45
60
60 dB mA
V
V/µs
µs
%
MHz
Ω
%
Hz
Degrees
1.
The input bias currents are junction leakage currents which approximately double for every 10°C increase in the junction temperature.
4/14
LF351
Figure 3.
Maximum peak-to-peak output voltage versus frequency
Electrical characteristics
Figure 4.
Maximum peak-to-peak output voltage versus frequency
Figure 5.
Maximum peak-to-peak output voltage versus frequency
Figure 6.
Maximum peak-to-peak output voltage versus free air temp.
Figure 7.
Maximum peak-to-peak output voltage versus load resistance
Figure 8.
Maximum peak-to-peak output voltage versus supply voltage
5/14
Electrical characteristics LF351
Figure 9.
Input bias current versus free air temperature
Figure 10.
Large signal differential voltage amplification versus free air temp.
Figure 11.
Large signal differential voltage amplification and phase shift versus frequency
Figure 12.
Total power dissipation versus free air temperature
Figure 13.
Supply current per amplifier versus free air temperature
Figure 14.
Supply current per amplifier versus supply voltage
6/14
LF351
Figure 15.
Common mode rejection ratio versus free air temperature
Electrical characteristics
Figure 16.
Voltage follower large signal pulse response
Figure 17.
Output voltage versus elapsed time Figure 18.
Equivalent input noise voltage versus frequency
Figure 19.
Total harmonic distortion versus frequency
7/14
Parameter measurement information
Figure 20.
Voltage follower Figure 21.
Gain-of-10 inverting amplifier
LF351
8/14
LF351
Figure 22.
Square wave oscillator (0.5 Hz)
Typical application
Figure 23.
High Q notch filter
9/14
Package information LF351
In order to meet environmental requirements, STMicroelectronics offers these devices in
ECOPACK
®
packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics trademark. ECOPACK specifications are available at: www.st.com
.
10/14
LF351
6.1 DIP8 package information
Figure 24.
DIP8 package mechanical drawing
Package information
E
E1 e eA eB
L b b2 c
D
A
A1
A2
Table 4.
Ref.
DIP8 package mechanical data
Dimensions
Millimeters
Min.
Typ.
Max.
5.33
Min.
0.20
9.02
7.62
6.10
0.38
2.92
0.36
1.14
3.30
0.46
1.52
0.25
9.27
7.87
6.35
2.54
7.62
4.95
0.56
1.78
0.36
10.16
8.26
7.11
0.015
0.115
0.014
0.045
0.008
0.355
0.300
0.240
2.92
3.30
10.92
3.81
0.115
0.130
0.018
0.060
0.010
0.365
0.310
0.250
0.100
0.300
0.130
Inches
Typ.
Max.
0.210
0.195
0.022
0.070
0.014
0.400
0.325
0.280
0.430
0.150
11/14
Package information
Figure 25.
SO-8 package mechanical drawing
LF351
12/14 c
D
E
E1
A
A1
A2 b
L k e h ccc
Table 5.
Ref.
SO-8 package mechanical data
Dimensions
Min.
Millimeters
Typ.
Min.
Max.
1.75
0.25
0.10
1.25
0.28
0.17
4.80
5.80
3.80
4.90
6.00
3.90
1.27
0.48
0.23
5.00
6.20
4.00
0.004
0.049
0.011
0.007
0.189
0.228
0.150
0.25
0.40
1°
0.50
1.27
8°
0.10
0.010
0.016
1°
Inches
Typ.
0.193
0.236
0.154
0.050
Max.
0.069
0.010
0.019
0.010
0.197
0.244
0.157
0.020
0.050
8°
0.004
LF351 Ordering information
Table 6.
Order codes
Order code
Temperature range
LF151N
LF151D
LF151DT
LF251N
LF251D
LF251DT
LF351N
LF351D
LF351DT
-55°C, +125°C
-40°C, +105°C
0°C, +70°C
Package
DIP8
SO-8
DIP8
SO-8
DIP8
SO-8
Packing
Tape
Tape or
Tape & reel
Tape
Tape or
Tape & reel
Tape
Tape or
Tape & reel
Marking
LF151N
151
LF251N
251
LF351N
351
Table 7.
Date
17-May-2001
28-April-2008
Document revision history
Revision
1
2
Initial release.
Updated document format.
Changes
13/14
LF351
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