ST TL081 User Manual

General purpose JFET single operational amplifiers

Features

■ Wide common-mode (up to V

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)

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.

CC

+

) and

TL081

N

DIP8

(Plastic package)

D

SO-8

(Plastic micropackage)

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 - V

CC

5 - Offset null 2 6 - Output

+

7 - V

CC

8 - N.C.

June 2008 Rev 3 1/15

www.st.com

15

Schematic diagram TL081

Output

Non-inverting

input

Inverting

input

V

CC

V

CC

100

Ω

1.3k

30k

35k

100

Ω

1.3k

8.2k

Offset Null1 Offset Null2

100

Ω

200

Ω

N1

N2

TL081

100k

Ω

V

CC

1 Schematic diagram

Figure 1. Schematic diagram

Figure 2. Input offset voltage null circuit

2/15

TL081 Absolute maximum ratings

2 Absolute maximum ratings

Table 1. Absolute maximum ratings

Symbol Parameter TL081I, AI, BI

V

CC

V

P

tot

Supply voltage

Input voltage

in

Differential input voltage

id

Power dissipation 680 mW

Output short-circuit duration

T

stg

Storage temperature range -65 to +150 °C

Thermal resistance junction to

R

thja

ambient

SO-8

(1)

(2)

(3)

(4)

(5) (6)

DIP8

Thermal resistance junction to case

R

thjc

SO-8

(5) (6)

DIP8

HBM: human body model

ESD

MM: machine model

CDM: charged device model

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

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. Operating conditions

(7)

(8)

(9)

TL081C, AC,

BC

±18 V

±15 V

±30 V

Infinite

125

85

40 41

500 V

200 V

1.5 kV

CC

+

and V

CC

-

.

Unit

°C/W

Symbol Parameter TL081I, AI, BI TL081C, AC, BC Unit

Supply voltage range 6 to 36 V

CC

Operating free-air temperature range -40 to +105 0 to +70 °C

T

V

oper

3/15

Electrical characteristics TL081

3 Electrical characteristics

Table 3. VCC = ±15V, T

= +25°C (unless otherwise specified)

amb

Symbol Parameter

Input offset voltage (Rs = 50Ω)

T

= +25°C TL081

amb

TL081A

V

io

≤ T

T

min

amb

≤ T

max

TL081B TL081 TL081A TL081B

DV

I

Input offset voltage drift 10 10 µV/°C

io

≤ T

(1)

max

(1)

max

Input offset current

io

T

amb

T

Input bias current

ib

T

amb

T

= +25°C

≤ T

min

= +25°C

≤ T

min

amb

Large signal voltage gain (RL = 2kΩ, Vo = ±10V)

A

vd

T T

amb

min

= +25°C

≤ T

amb

≤ T

max

Supply voltage rejection ratio (R

SVR

T T

amb

min

= +25°C

≤ T

amb

≤ T

max

Supply current, no load

I

CC

V

icm

= +25°C

T

amb

≤ T

T

min

amb

≤ T

max

Input common mode voltage range ±11

Common mode rejection ratio (RS = 50Ω)

CMR

T T

amb

min

= +25°C

≤ T

amb

≤ T

max

Output short-circuit current

I

os

T T

amb

min

= +25°C

≤ T

amb

≤ T

max

Output voltage swing

= +25°C RL = 2kΩ

T

amb

min

≤ T

amb

≤ T

RL = 10kΩ

RL = 2kΩ

max

±V

opp

R

SR

Slew rate (T

= 10V, RL = 2kΩ, CL = 100pF, unity gain

V

in

= +25°C)

amb

= 10kΩ

L

= 50Ω)

S

TL081I, AC, AI, BC,

BI

TL081C

Unit

Min. Typ. Max. Min. Typ. Max.

3

10

3

6

1

3

13

310

mV

13 7 5

5 100

4

20 200

20

5025200 2515200

808086 707086

1.4 2.5

2.5

+15

-12

±11

808086 707086

101040 6060101040 60

510010pA

20 400

20

1.4 2.5

2.5

+15

-12

nA

V/mV

dB

mA

V

dB

mA

60

10 12 10 12

12

13.5

10 12 10 12

12

13.5

V

816 816 V/µs

4/15

TL081 Electrical characteristics

Table 3. VCC = ±15V, T

Symbol Parameter

= +25°C (unless otherwise specified) (continued)

amb

TL081I, AC, AI, BC,

BI

TL081C

Unit

Min. Typ. Max. Min. Typ. Max.

t

r

K

ov

GBP

R

THD

e

n

Rise time (T

Vin = 20mV, RL = 2kΩ, CL = 100pF, unity gain

Overshoot (T

Vin = 20mV, RL = 2kΩ, CL = 100pF, unity gain

Gain bandwidth product (T

Vin = 10mV, RL = 2kΩ, CL = 100pF, F= 100kHz

Input resistance 10

i

Total harmonic distortion (T

F= 1kHz, R Vo = 2V

Equivalent input noise voltage

RS = 100Ω, F= 1kHz

= +25°C)

amb

= +25°C)

amb

= +25°C)

amb

= +25°C),

amb

= 2kΩ,CL = 100pF, Av = 20dB,

L

pp

0.1 0.1 µs

10 10 %

2.5 4 2.5 4 MHz

12

10

12

0.01 0.01 %

15 15

∅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.

Ω

nV

-----------Hz

5/15