Motorola LM308AD, LM308AN Datasheet

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The LM308A operational amplifier provides high input impedance, low
input offset and temperature drift, and low noise. These characteristics are
made possible by use of a special Super Beta processing technology. This
amplifier is particularly useful for applications where high accuracy and low
drift performance are essential. In addition high speed performance may be
improved by employing feedforward compensation techniques to maximize
slew rate without compromising other performance criteria.

The LM308A offers extremely low input offset voltage and drift
specifications allowing usage in even the most critical applications without
external offset nulling.

• Operation from a Wide Range of Power Supply Voltages

• Low Input Bias and Offset Currents

• Low Input Offset Voltage and Guaranteed Offset Voltage Drift

Performance

• High Input Impedance

Frequency Compensation

Standard Compensation

Input

Input

R1

R3

Compen A

Inverting

Noninverting

+

R2

C

f

Cf

Compen B

≥

30

1 +

Output

1

R2
R1

Modified Compensation

Inverting

Noninverting

R1

Input

R3

Input

+

100 pF

R2

Output

Compen B

SUPER GAIN

OPERATIONAL AMPLIFIER

SEMICONDUCTOR

TECHNICAL DATA

8

1

N SUFFIX

PLASTIC PACKAGE

CASE 626

8

1

D SUFFIX

PLASTIC PACKAGE

CASE 751

(SO–8)

PIN CONNECTIONS

Standard Feedforward

Compensation

10 k

Input

500 pF

Compen A

5.0 pF
10

k

+

Compen B

3.0 k
10 pF

Output

Feedforward Compensations for

Decoupling Load Capacitance

RS > 10 k

Input

0.01

MOTOROLA ANALOG IC DEVICE DATA

Compen A Compen B

Inputs

100 k

10 pFC2*

µ

F

+

3.0 k

500 pF

Compen A

500

Compen B

10 pF

*C2 >

5 x 10

R2

Output

C

L

75 pF to

0.01

µ

F

5

pF

Device

LM308AN
LM308AD

 Motorola, Inc. 1996 Rev 0

1

–

2

+

3

4

V

EE

(Top View)

ORDERING INFORMATION

Operating

Temperature Range

TA = 0° to +70°C

8

7

6

5

V
Output
NC

CC

Package

Plastic DIP

SO–8

1

LM308A

MAXIMUM RATINGS (T

Power Supply Voltage V
Input Voltage (See Note 1) V
Input Differential Current ( See Note 2) I
Output Short Circuit Duration t
Operating Ambient Temperature Range T
Storage Temperature Range T
Junction Temperature T

NOTES: 1. For supply voltages less than ±15 V , the maximum input voltage is equal to the supply

voltage.

2.The inputs are shunted with back–to–back diodes for overvoltage protection. Therefore,
excessive current will flow if a differential input voltage in excess of 1.0 V is applied
between the inputs, unless some limiting resistance is used.

ELECTRICAL CHARACTERISTICS (Unless otherwise noted these specifications apply for supply voltages of +5.0 V ≤ V

and –5.0 V ≥ VEE ≥ –15 V, TA = +25°C.)

Input Offset Voltage V
Input Offset Current I
Input Bias Current I
Input Resistance r
Power Supply Currents ICC, I

(VCC = +15 V, VEE = –15 V)

Large Signal Voltage Gain A

(VCC = +15 V, VEE = –15 V, VO = ±10 V, RL ≥ 10 kΩ)

The following specifications apply over the operating temperature range.

Input Offset Voltage V
Input Offset Current I
Average Temperature Coefficient of Input Offset Voltage ∆VIO/∆T – 1.0 5.0 µV/°C

TA (min) ≤ TA ≤ TA (max)
Average Temperature Coefficient of Input Offset Current ∆IIO/∆T – 2.0 10 pA/°C
Input Bias Current I
Large Signal Voltage Gain A

(VCC +15 V, VEE= –15 V, VO = ±10 V, RL ≥ 10 kΩ)
Input Voltage Range V

(VCC = +15 V, VEE= –15 V)
Common Mode Rejection CMR 96 110 – dB

(RS ≤ 50 kΩ)
Supply Voltage Rejection PSR 96 110 – dB

(RS ≤ 50 kΩ)
Output Voltage Range

(VCC = +15 V, VEE= –15 V, RL = 10 kΩ)

= +25°C, unless otherwise noted.)

A

Rating Symbol Value Unit

CC, VEE

I

ID

SC

A

stg

J

Characteristic

±18 Vdc
±15 V
±10 mA

Indefinite

0 to +70 °C

–65 to +150

+150 °C

Symbol Min Typ Max Unit

IO
IO
IB

i

VOL

IO
IO

IB

VOL

ICR

V

OR

°C

EE

≤ +15 V

CC

– 0.3 0.5 mV
– 0.2 1.0 nA
– 1.5 7.0 nA

10 40 – MΩ

– ±0.3 ±0.8 mA

80 300 – V/mV

– – 0.73 mV
– – 1.5 nA

– – 10 nA

60 – – V/mV

±14 – – V

±13 ±14 – V

2

MOTOROLA ANALOG IC DEVICE DATA

Figure 1. Input Bias and Input Offset Currents

2.0

1.8

1.6

1.4

1.2

1.0

0.8

, INPUT BIAS CURRENT (nA)

0.6

IB

I

0.4

0.2
0

–60 –40 –20 0 20 40 60 80 100 120 140

T, TEMPERATURE (°C) ri, INPUT RESISTANCE (Ω)

I

IO

I

IB

Figure 3. V oltage Gain versus Supply Voltages

130

120

TA = 0°C

110

100

, VOLTAGE GAIN (dB)

VOL

A

90

80

+25°C
–55°C
+70°C

+125°C

CF = 0
f = 100 Hz

0 5.0 10 15 20

VCC = VEE

, SUPPLY VOLTAGES (V)

LM308A

0.25

0.20

0.15

0.10

, INPUT OFFSET CURRENT (nA)

0.05
IO

I

0

Figure 2. Maximum Equivalent Input Offset

V oltage Error versus Input Resistance

100

10

1.0

0.1

EQUIVALENT INPUT OFFSET VOLTAGE (mV)

100 k 1.0 M 10 M 100 M

Figure 4. Power Supply Currents versus

Power Supply Voltages

500

µ

400

TA = –55°C

300

200

, SUPPLY CURRENTS ( A)

EE

I

100

=

CC

I

0

0 5.0 10

0°C

+25°C
+70°C

+125°C

VCC =



VEE

, SUPPLY VOLTAGES (V)

15 20

Figure 5. Open Loop Frequency Response Figure 6. Large Signal Frequency Response

140
120
100

80
60
40

, VOLTAGE GAIN (dB)

20

VOL

A

0

–20

1.0 10 100 1.0 k 10 k 100 k 1.0 M 10 M 100 M

CF = 3.0 pF

CF = 30 pF

CF = 100 pF

f, FREQUENCY (Hz) f, FREQUENCY (Hz)

MOTOROLA ANALOG IC DEVICE DATA

20

)

p–p

16

±

12

8.0

4.0

, OUTPUT VOL TAGE RANGE ( V

OR

V

CF = 30 pF

0

1.0 k 10 k 100 k 1.0 M

CF = 3.0 pF

VCC = +15 V
VEE = –15 V

°

C

TA = +25

3