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부품번호 LM308A 기능
기능 Precision Operational Amplifier
제조업체 Motorola Inc
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LM308A 데이터시트, 핀배열, 회로
Order this document by LM308A/D
Precision Operational
Amplifier
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
LM308A
SUPER GAIN
OPERATIONAL AMPLIFIER
SEMICONDUCTOR
TECHNICAL DATA
8
1
N SUFFIX
PLASTIC PACKAGE
CASE 626
Frequency Compensation
Standard Compensation
Modified Compensation
Inverting
Input
Noninverting
Input
R2
R1
R3 +
Compen A Cf
Output
Inverting
Input
Compen B
Noninverting
Input
R1
R3
Cf 30
1
1 + R2
R1
R2
+
100 pF
Output
Compen B
8
1
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SO–8)
PIN CONNECTIONS
Standard Feedforward
Compensation
Feedforward Compensations for
Decoupling Load Capacitance
10 k
Input
5.0 pF
10
k
+
500 pF
Compen A
Input
Output
Compen B
3.0 k
10 pF
RS > 10 k
100 k
C2* 10 pF
0.01 µF
500
+ Compen B
500 pF 3.0 k
Compen A
10 pF
Output
CL
75 pF to
0.01µF
*C2
>
5
x 105
R2
pF
Compen A 1
Inputs
2
3
VEE 4
+
8 Compen B
7 VCC
6 Output
5 NC
(Top View)
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
LM308AN
LM308AD
TA = 0° to +70°C
Plastic DIP
SO–8
MOTOROLA ANALOG IC DEVICE DATA
© Motorola, Inc. 1996
Rev 0
1




LM308A pdf, 반도체, 판매, 대치품
LM308A
SUGGESTED DESIGN APPLICATIONS
INPUT GUARDING
Special care must be taken in the assembly of printed
circuit boards to take full advantage of the low input currents
of the LM308A amplifier. Boards must be thoroughly cleaned
with alcohol and blown dry with compressed air. After
cleaning, the boards should be coated with epoxy or silicone
rubber to prevent contamination.
Figure 7. Fast (1) Summing Amplifier with
Low Input Current
Even with properly cleaned and coated boards, leakage
currents may cause trouble at +125°C, particularly since the
input pins are adjacent to pins that are at supply potentials.
This leakage can be significantly reduced by using guarding
to lower the voltage difference between the inputs and
adjacent metal runs. The guard, which is a conductive ring
surrounding the inputs, is connected to a low–impedance
point that is at approximately the same voltage as the inputs.
Leakage currents from high voltage pins are then absorbed
by the guard.
Figure 8. Sample and Hold
RS
Input
R1
150 k 0.002 µF
C5 (2)
R4
LM308A
R2
1M
Compen B
300 pF
0.002
µF
2
3
1.0 M
150 pF
1
6
Output
LM101A (3)
or equiv
(1) Power Bandwidth: 250 kHz
Small Signal Bandwidth:
3.5 MHz
Slew Rate: 10 V/µs
(2) C5 =
6 X 10–8
R1
(3) In addition to increasing speed,
the LM101A raises high and low
frequency gain, increases output
drive capability and eliminates
thermal feedback.
VCC
Input
1.0 M
Sample
Q1
Q2
1.0 µF (1)
Output
30 pF
(1) Teflon, Polyethylene or Polycarbonate
Dielectric Capacitor
Figure 9. Connection of Input Guards
Inverting Amplifier
Follower
Noninverting Amplifier
R1
Input
R2
R3 (1)
C1
Output
(1) Used to compensate for large source resistances.
R3 (1)
Input
C1
Output
R3 (1)
R2
Output
R1
C1
Input
R1 R2
Note: must be an impedance.
R1 +R2
4 MOTOROLA ANALOG IC DEVICE DATA

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LM308A 전자부품, 판매, 대치품
LM308A
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola
data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals”
must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of
others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other
applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury
or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola
and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees
arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that
Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal
Opportunity/Affirmative Action Employer.
MOTOROLA ANALOG IC DEVICE DATA
7

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