LM308ADR2 데이터 시트보기 (PDF) - ON Semiconductor
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LM308ADR2 Datasheet PDF : 8 Pages
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LM308A
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.
Even with properly cleaned and coated boards, leakage
currents may cause trouble at +125°C, particularly since the
RS
Input
R1
150 k 0.002 µF
C5 (2)
R4
R2
1M
LM308A
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.
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.
VCC
Input
1.0 M
Sample
Q1
Q2
1.0 µF (1)
Output
30 pF
(1) Teflon, Polyethylene or Polycarbonate
Dielectric Capacitor
Figure 7. Fast (1) Summing Amplifier with
Low Input Current
Figure 8. Sample and Hold
Inverting Amplifier
R1
R2
Input
Follower
R3 (1)
R3 (1)
Output
Input
C1
(1) Used to compensate for large source resistances.
Output
C1
Noninverting Amplifier
R2
R3 (1)
Output
R1
C1
Input
R1 R2
Note:
must be an impedance.
R1 +R2
Figure 9. Connection of Input Guards
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