TL081
General purpose JFET single operational amplifiers
Features
■
Wide common-mode (up to VCC+) 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 (typ)
N
DIP8
(Plastic package)
D
SO-8
(Plastic micropackage)
Description
The TL081, TL081A and TL081B are high-speed
JFET input single operational amplifiers
incorporating well matched, high-voltage JFET
and bipolar transistors in a monolithic integrated
circuit.
Pin connections
(top view)
The devices feature high slew rates, low input
bias and offset currents, and low offset voltage
temperature coefficient.
1 - Offset null 1
2 - Inverting input
3 - Non-inverting input
4 - VCC5 - Offset null 2
6 - Output
7 - VCC+
8 - N.C.
June 2008
Rev 3
1/15
www.st.com
15
Schematic diagram
1
TL081
Schematic diagram
Figure 1.
Schematic diagram
V CC
Non-inverting
input
Inverting
input
100 Ω
200 Ω
Output
30k
100 Ω
8.2k
1.3k
35k
1.3k
35k
100 Ω
V CC
Offset Null1
Figure 2.
Offset Null2
Input offset voltage null circuit
TL081
N2
N1
100k Ω
V CC
2/15
TL081
2
Absolute maximum ratings
Absolute maximum ratings
Table 1.
Absolute maximum ratings
Symbol
VCC
Vin
Parameter
Supply voltage (1)
Input voltage
(2)
Vid
Differential input voltage
Ptot
Power dissipation
TL081C, AC,
BC
TL081I, AI, BI
(3)
Output short-circuit duration (4)
Unit
±18
V
±15
V
±30
V
680
mW
Infinite
Tstg
Storage temperature range
Rthja
Thermal resistance junction to
ambient(5) (6)
SO-8
DIP8
125
85
Rthjc
Thermal resistance junction to case(5) (6)
SO-8
DIP8
40
41
°C/W
HBM: human body model(7)
500
V
200
V
1.5
kV
ESD
-65 to +150
MM: machine model(8)
(9)
CDM: charged device model
°C
°C/W
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 VCC+ and VCC-.
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. 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.
5. Short-circuits can cause excessive heating and destructive dissipation.
6. Rth are typical values.
7. Human body model: 100 pF discharged through a 1.5kΩ resistor between two pins of the device, done for
all couples of pin combinations with other pins floating.
8. Machine model: a 200 pF cap is charged to the specified voltage, then discharged directly between two
pins of the device with no external series resistor (internal resistor < 5 Ω), done for all couples of pin
combinations with other pins floating.
9. Charged device model: all pins plus package are charged together to the specified voltage and then
discharged directly to the ground.
Table 2.
Symbol
Operating conditions
Parameter
VCC
Supply voltage range
Toper
Operating free-air temperature range
TL081I, AI, BI
TL081C, AC, BC
6 to 36
-40 to +105
Unit
V
0 to +70
°C
3/15
Electrical characteristics
TL081
3
Electrical characteristics
Table 3.
VCC = ±15V, Tamb = +25°C (unless otherwise specified)
Symbol
Parameter
TL081I, AC, AI, BC,
BI
Min.
Vio
DVio
Input offset voltage (Rs = 50Ω)
TL081
Tamb = +25°C
TL081A
TL081B
Tmin ≤ Tamb ≤ Tmax TL081
TL081A
TL081B
Input offset voltage drift
Typ.
Max.
3
3
1
10
6
3
13
7
5
TL081C
Unit
Min.
Typ.
Max.
3
10
mV
13
10
10
µV/°C
(1)
Iio
Input offset current
Tamb = +25°C
Tmin ≤ Tamb ≤ Tmax
5
100
4
5
100
10
pA
nA
Iib
Input bias current (1)
Tamb = +25°C
Tmin ≤ Tamb ≤ Tmax
20
200
20
20
400
20
nA
Avd
Large signal voltage gain (RL = 2kΩ, Vo = ±10V)
Tamb = +25°C
Tmin ≤ Tamb ≤ Tmax
50
25
200
25
15
200
V/mV
SVR
Supply voltage rejection ratio (RS = 50Ω)
Tamb = +25°C
Tmin ≤ Tamb ≤ Tmax
80
80
86
70
70
86
dB
ICC
Supply current, no load
Tamb = +25°C
Tmin ≤ Tamb ≤ Tmax
Vicm
Input common mode voltage range
CMR
Common mode rejection ratio (RS = 50Ω)
Tamb = +25°C
Tmin ≤ Tamb ≤ Tmax
80
80
86
Output short-circuit current
Tamb = +25°C
Tmin ≤ Tamb ≤ Tmax
10
10
40
10
12
10
12
8
Ios
±Vopp
SR
4/15
Output voltage swing
Tamb = +25°C
Tmin ≤ Tamb ≤ Tmax
1.4
RL = 2kΩ
RL = 10kΩ
RL = 2kΩ
RL = 10kΩ
Slew rate (Tamb = +25°C)
Vin = 10V, RL = 2kΩ, CL = 100pF, unity gain
±11
2.5
2.5
+15
-12
1.4
2.5
2.5
mA
+15
-12
V
70
70
86
dB
10
10
40
12
13.5
10
12
10
12
12
13.5
V
16
8
16
V/µs
±11
60
60
60
60
mA
TL081
Table 3.
Electrical characteristics
VCC = ±15V, Tamb = +25°C (unless otherwise specified) (continued)
Symbol
Parameter
TL081I, AC, AI, BC,
BI
Min.
Typ.
Max.
TL081C
Unit
Min.
Typ.
Max.
tr
Rise time (Tamb = +25°C)
Vin = 20mV, RL = 2kΩ, CL = 100pF, unity gain
0.1
0.1
µs
Kov
Overshoot (Tamb = +25°C)
Vin = 20mV, RL = 2kΩ, CL = 100pF, unity gain
10
10
%
GBP
Gain bandwidth product (Tamb = +25°C)
Vin = 10mV, RL = 2kΩ, CL = 100pF, F= 100kHz
4
MHz
Ri
THD
2.5
4
2.5
Input resistance
1012
1012
Ω
Total harmonic distortion (Tamb = +25°C),
F= 1kHz, RL = 2kΩ,CL = 100pF, Av = 20dB,
Vo = 2Vpp
0.01
0.01
%
en
Equivalent input noise voltage
RS = 100Ω, F= 1kHz
15
15
nV
-----------Hz
∅m
Phase margin
45
45
degrees
1. The input bias currents are junction leakage currents which approximately double for every 10°C increase in the junction
temperature.
5/15
Electrical characteristics
TL081
Maximum peak-to-peak output
voltage versus frequency
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 temperature
Figure 7.
Maximum peak-to-peak output
voltage versus load resistance
Figure 8.
Maximum peak-to-peak output
voltage versus supply voltage
MAXIMUM PEAK-TO-PEAK OUTPUT
VOLTAGE (V)
Figure 3.
6/15
30
25
RL = 10 kΩ
Tamb = +25˚C
20
15
10
5
0
2
4
6
8
10
12
SUPPLY VOLTAGE ( V)
14
16
TL081
Electrical characteristics
Figure 9.
Input bias current versus free air
temperature
Figure 10. Large signal differential voltage
amplification versus free air temp
100
1000
15V
DIFFERENTIAL VOLTAGE
AMPLIFICATION (V/V)
INPUT BIAS CURRENT (nA)
V CC =
10
1
0.1
0.01
-50
400
200
100
40
20
10
4
2
1
-25
0
25
50
75
100
V CC = 15V
V O = 10V
125
R L = 2k Ω
-75
-50
TEMPERATURE (˚C)
180
10
90
R = 2kW
L
C L = 100pF
V CC = 15V
T amb = +125°C
1
100
1K
10K
0
100K
25
50
75
125
100
Figure 12. Total power dissipation versus free
air temperature
1M
10M
TOTAL POWER DISSIPATION (mW)
DIFFERENTIAL VOLTAGE
AMPLIFICATION (V/V)
DIFFERENTIAL
VOLTAGE
AMPLIFICATION
(left scale)
PHASE SHIFT
(right scale)
0
TEMPERATURE (˚C)
Figure 11. Large signal differential voltage
amplification and phase shift
versus frequency
100
-25
250
225
200
175
150
125
100
75
50
25
0
V CC = 15V
No signal
No load
-75
-50
FREQUENCY (Hz)
-25
0
25
50
75
100
125
TEMPERATURE (˚C)
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
Figure 13. Supply current per amplifier versus Figure 14. Supply current per amplifier versus
free air temperature
supply voltage
V CC = 15V
No signal
No load
-75
-50
-25
0
25
50
TEMPERATURE (˚C)
75
100
125
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
Tamb = +25˚C
No signal
No load
2
4
6
10
12 14
8
SUPPLY VOLTAGE ( V)
16
7/15
Electrical characteristics
TL081
Figure 15. Common mode rejection ratio
versus free air temperature
Figure 16. Equivalent input noise voltage
versus frequency
70
R L = 10 kΩ
VC C = 15V
88
87
86
85
84
83
-75
-50
-25
VCC = 15V
A V = 10
R S = 100 Ω
T amb = +25˚C
60
EQUIVALENT INPUT NOISE
VOLTAGE (nV/VHz)
COMMON MODE MODE REJECTION
RATIO (dB)
89
0
25
50
75
100
50
40
30
20
10
0
125
10
40
TEMPERATURE (˚C)
100
400 1k
4k
10k
40k 100k
FREQUENCY (Hz)
Figure 17. Output voltage versus elapsed time Figure 18. Total harmonic distortion versus
frequency
1
24
OVERSHOOT
20
90%
16
12
8
V
4
10%
0
tr
-4
0
0.1
CC
= 15V
R L = 2kΩ
Tamb = +25˚C
0.2
0.3
0.4
0.5
0.6
0.7
TIME (μs)
INPUT AND OUTPUT VOLTAGES
(V)
6
OUTPUT
INPUT
2
0
VCC=
-2
-6
15V
R L = 2 kW
C L= 100pF
Tamb = +25°C
-4
0
0.5
1
1.5
2
TIME (ms)
8/15
V VCC = = 15V
15V
CC
A AV V= =1 1
V VO O(rms)
= =6V6V
(rms)
0.4
0.1
0.04
T amb
+25˚C
T amb= =+25˚C
0.01
0.004
0.001
100
400
1k
4k
10k
FREQUENCY (Hz)
Figure 19. Voltage follower large signal pulse
response
4
TOTAL HARMONIC DISTORTION
(%)
OUTPUT VOLTAGE (mV)
28
2.5
3
3.5
40k
100k
TL081
4
Parameter measurement information
Parameter measurement information
Figure 20. Voltage follower
Figure 21. Gain-of-10 inverting amplifier
10k Ω
1k Ω
eI
eo
TL081
RL
C L = 100pF
9/15
Typical applications
5
TL081
Typical applications
Figure 22. 0.5 Hz square wave oscillator
R F = 1 0 0k Ω
3.3k Ω
+15V
TL0 81
C F= 3.3 μF
-15V
3.3k Ω
f osc=
Figure 23. High Q notch filter
10/15
1
2 x R F CF
1k Ω
9.1k Ω