LM108 Amplifiers Datasheet

LM108 Datasheet, PDF, Equivalent


Part Number

LM108

Description

Operational Amplifiers

Manufacture

National Semiconductor

Total Page 10 Pages
Datasheet
Download LM108 Datasheet


LM108
December 1994
LM108 LM208 LM308 Operational Amplifiers
General Description
The LM108 series are precision operational amplifiers hav-
ing specifications a factor of ten better than FET amplifiers
over a b55 C to a125 C temperature range
The devices operate with supply voltages from g2V to
g20V and have sufficient supply rejection to use unregulat-
ed supplies Although the circuit is interchangeable with and
uses the same compensation as the LM101A an alternate
compensation scheme can be used to make it particularly
insensitive to power supply noise and to make supply by-
pass capacitors unnecessary
The low current error of the LM108 series makes possible
many designs that are not practical with conventional ampli-
fiers In fact it operates from 10 MX source resistances
introducing less error than devices like the 709 with 10 kX
sources Integrators with drifts less than 500 mV sec and
analog time delays in excess of one hour can be made us-
ing capacitors no larger than 1 mF
The LM108 is guaranteed from b55 C to a125 C the
LM208 from b25 C to a85 C and the LM308 from 0 C to
a70 C
Features
Y Maximum input bias current of 3 0 nA over temperature
Y Offset current less than 400 pA over temperature
Y Supply current of only 300 mA even in saturation
Y Guaranteed drift characteristics
Compensation Circuits
Standard Compensation Circuit
Alternate Frequency Compensation
Cf t
R1 CO
R1 a R2
CO e 30 pF
Bandwidth and slew rate are proportional to 1 Cf
TL H 7758 – 1
TL H 7758 – 2
Improves rejection of power supply noise by a factor of ten
Bandwidth and slew rate are proportional to 1 Cs
Feedforward Compensation
C1995 National Semiconductor Corporation TL H 7758
TL H 7758 – 3
RRD-B30M115 Printed in U S A

LM108
Absolute Maximum Ratings
If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office
Distributors for availability and specifications
(Note 5)
LM108 LM208
Supply Voltage
g20V
Power Dissipation (Note 1)
500 mW
Differential Input Current (Note 2)
g10 mA
Input Voltage (Note 3)
g15V
Output Short-Circuit Duration
Continuous
Operating Temperature Range (LM108)
b55 C to a125 C
(LM208)
b25 C to a 85 C
Storage Temperature Range
b65 C to a150 C
Lead Temperature (Soldering 10 sec)
DIP 260 C
H Package Lead Temp
(Soldering 10 seconds)
300 C
Soldering Information
Dual-In-Line Package
Soldering (10 seconds)
260 C
Small Outline Package
Vapor Phase (60 seconds)
215 C
Infrared (15 seconds)
220 C
See AN-450 ‘‘Surface Mounting Methods and Their Effect on Product
Reliability’’ for other methods of soldering surface mount devices
ESD Tolerance (Note 6)
2000V
LM308
g18V
500 mW
g10 mA
g15V
Continuous
0 C to a70 C
b65 C to a150 C
260 C
300 C
Electrical Characteristics (Note 4)
Parameter
Condition
Input Offset Voltage
Input Offset Current
Input Bias Current
Input Resistance
Supply Current
Large Signal Voltage
Gain
Input Offset Voltage
Average Temperature
Coefficient of Input
Offset Voltage
Input Offset Current
Average Temperature
Coefficient of Input
Offset Current
Input Bias Current
Supply Current
Large Signal Voltage
Gain
Output Voltage Swing
TA e 25 C
TA e 25 C
TA e 25 C
TA e 25 C
TA e 25 C
TA e 25 C VS e g15V
VOUT e g10V RL t 10 kX
TA e a125 C
VS e g15V VOUT e g10V
RL t 10 kX
VS e g15V RL e 10 kX
LM108 LM208
Min Typ Max
07 20
0 05 0 2
08 20
30 70
03 06
50 300
30
3 0 15
04
05 25
25
g13
0 15
g14
30
04
LM308
Min Typ Max
20 75
02 1
15 7
10 40
03 08
25 300
10
6 0 30
15
2 0 10
10
15
g13
g14
Units
mV
nA
nA
MX
mA
V mV
mV
mV C
nA
pA C
nA
mA
V mV
V
2


Features LM108 LM208 LM308 Operational Amplifiers December 1994 LM108 LM208 LM308 Oper ational Amplifiers General Description The LM108 series are precision operatio nal amplifiers having specifications a factor of ten better than FET amplifier s over a b55 C to a 125 C temperature r ange The devices operate with supply vo ltages from g 2V to g 20V and have suff icient supply rejection to use unregula ted supplies Although the circuit is in terchangeable with and uses the same co mpensation as the LM101A an alternate c ompensation scheme can be used to make it particularly insensitive to power su pply noise and to make supply bypass ca pacitors unnecessary The low current er ror of the LM108 series makes possible many designs that are not practical wit h conventional amplifiers In fact it op erates from 10 MX source resistances in troducing less error than devices like the 709 with 10 kX sources Integrators with drifts less than 500 mV sec and an alog time delays in excess of one hour can be made using capaci.
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