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National Semiconductor
National Semiconductor

LM208A Datasheet

Operational Amplifiers


LM208A Datasheet Preview


May 1989
LM108A LM208A LM308A Operational Amplifiers
General Description
The LM108 LM108A series are precision operational ampli-
fiers having specifications about a factor of ten better than
FET amplifiers over their operating temperature range In
addition to low input currents these devices have extremely
low offset voltage making it possible to eliminate offset ad-
justments in most cases and obtain performance ap-
proaching chopper stabilized amplifiers
The devices operate with supply voltages from g2V to
g18V 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 LM108A 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 LM208A is identical to the LM108A except that the
LM208A has its performance guaranteed over a b25 C to
a85 C temperature range instead of b55 C to a125 C
The LM308A devices have slightly-relaxed specifications
and performances over a 0 C to a70 C temperature range
Features
Y Offset voltage guaranteed less than 0 5 mV
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 5 mV C drift
Compensation Circuits
Standard Compensation Circuit
Alternate Frequency Compensation
Cf
t
R1 CO
R1aR2
CO e 30 pF
TL H 7759 – 1
Bandwidth and slew rate are proportional to 1 Cf
Improves rejection of power supply
noise by a factor of ten
Bandwidth and slew rate are proportional to 1 Cs
Feedforward Compensation
TL H 7759 – 2
C1995 National Semiconductor Corporation TL H 7759
TL H 7759 – 3
RRD-B30M115 Printed in U S A
Page 1

LM108A LM208A Absolute Maximum Ratings
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
(Note 5)
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 Free Air Temperature Range
LM108A
b55 C to a125 C
LM208A
b25 C to a85 C
Storage Temperature Range
b65 C to a150 C
Lead Temperature (Soldering 10 sec ) (DIP)
260 C
Soldering Information
Dual-In-Line Package
Soldering (10 sec )
Small Outline Package
Vapor Phase (60 sec )
Infrared (15 sec )
260 C
215 C
220 C
See An-450 ‘‘Surface Mounting Methods and Their Effect
on Product Reliability’’ for other methods of soldering sur-
face mount devices
ESD Tolerance (Note 6)
2000V
Electrical Characteristics (Note 4)
Parameter
Conditions
Min Typ Max Units
Input Offset Voltage
Input Offset Current
Input Bias Current
Input Resistance
Supply Current
Large Signal Voltage Gain
Input Offset Voltage
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
03 05
mV
0 05 0 2
nA
08 20
nA
30 70
MX
03 06
mA
80 300
V mV
1 0 mV
Average Temperature Coefficient
of Input Offset Voltage
1 0 5 0 mV C
Input Offset Current
0 4 nA
Average Temperature Coefficient
of Input Offset Current
0 5 2 5 pA C
Input Bias Current
3 0 nA
Supply Current
Large Signal Voltage Gain
Output Voltage Swing
Input Voltage Range
Common Mode Rejection Ratio
TA e 125 C
0 15 0 4
mA
VS e g15V VOUT e g10V
RL t 10 kX
40
V mV
VS e g15V RL e 10 kX
g13
g14
V
VS e g15V
g13 5
V
96 110
dB
Supply Voltage Rejection Ratio
96 110
dB
Note 1 The maximum junction temperature of the LM108A is 150 C while that of the LM208A is 100 C For operating at elevated temperatures devices in the H08
package must be derated based on a thermal resistance of 160 C W junction to ambient or 20 C W junction to case The thermal resistance of the dual-in-line
package is 100 C W junction to ambient
Note 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
1V is applied between the inputs unless some limiting resistance is used
Note 3 For supply voltages less than g15V the absolute maximum input voltage is equal to the supply voltage
Note 4 These specifications apply for g5V s VS s g20V and b55 C s TA s 125 C unless otherwise specified With the LM208A however all temperature
specifications are limited to b25 C s TA s 85 C
Note 5 Refer to RETS108AX for LM108AH and LM108AJ-8 military specifications
Note 6 Human body model 1 5 kX in series with 100 pF
2
Page 2

LM308A Absolute Maximum Ratings
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage
g18V
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
0 C to a70 C
Storage Temperature Range
b65 C to a150 C
H-Package Lead Temperature
(Soldering 10 sec )
300 C
Lead Temperature (Soldering 10 sec ) (DIP)
260 C
Soldering Information
Dual-In-Line Package
Soldering (10 sec )
Small Outline Package
Vapor phase (60 sec )
Infrared (15 sec )
260 C
215 C
220 C
See An-450 ‘‘Surface Mounting Methods and Their Effect
on Product Reliability’’ for other methods of soldering sur-
face mount devices
ESD rating to be determined
Electrical Characteristics (Note 4)
Parameter
Conditions
Min Typ Max Units
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
TA e 25 C
TA e 25 C
TA e 25 C
TA e 25 C
TA e 25 C VS e g15V
TA e 25 C VS e g15V
VOUT e g10V RL t 10 kX
VS e g15V RS e 100X
VS e g15V RS e 100X
03 05
mV
02 1
nA
15 7
nA
10 40
MX
03 08
mA
80 300
V mV
0 73 mV
2 0 5 0 mV C
Input Offset Current
1 5 nA
Average Temperature Coefficient
of Input Offset Current
2 0 10 pA C
Input Bias Current
10 nA
Large Signal Voltage Gain
Output Voltage Swing
Input Voltage Range
Common Mode Rejection Ratio
VS e g15V VOUT e g10V
RL t 10 kX
VS e g15V RL e 10 kX
VS e g15V
60
g13
g14
96
g14
110
V mV
V
V
dB
Supply Voltage Rejection Ratio
96 110
dB
Note 1 The maximum junction temperature of the LM308A is 85 C For operating at elevated temperatures devices in the H08 package must be derated based on
a thermal resistance of 160 C W junction to ambient or 20 C W junction to case The thermal resistance of the dual-in-line package is 100 C W junction to
ambient
Note 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
1V is applied between the inputs unless some limiting resistance is used
Note 3 For supply voltages less than g15V the absolute maximum input voltage is equal to the supply voltage
Note 4 These specifications apply for g5V s VS s g15V and 0 C s TA s a70 C unless otherwise specified
3
Page 3
Part Number LM208A
Manufactur National Semiconductor
Description Operational Amplifiers
Total Page 8 Pages
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