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Features
• Low input bias current — 2 nA
• Low input offset current — 200 pA
• Low input offset voltage — 500mV
• Low input offset drift — 5 mV/°C
• Wide supply range — ±3V to ±20V
• Low supply current — 0.6 mA
• High PSRR — 96 dB
• High CMRR — 96 dB
• MIL-STD-883B available
Description
The LM108A operational amplifiers features low input bias
current combined with the advantages of bipolar transistor
construction; input offset voltages and currents are kept
low over a wide range of temperature and supply voltage.
Fairchild Semiconductor’s superbeta bipolar manufacturing
process includes extra treatment at epitaxial gro wth to ensure
low input voltage noise.
The LH2108 consists of two LM108 ICs in one 16-lead DIP.
The “A” versions meet tighter electrical specifications than
the plain versions. All types are av ailable with 883B military
screening.
LM108A/LH2108A
Precision Operational Amplifiers
Rev 1.0.0
LM108A/LH2108A PRODUCT SPECIFICATION
2
Pin Assignments
Absolute Maximum Ratings
Notes:
1. The inputs are shunted with back-to-back diodes for overvoltage protection. Therefore, if a differential input voltage in excess
of 1V is applied between the inputs, excessive current will flow, unless some limiting resistance is provided.
2. For supply voltages less than ±15V, the absolute maximum input voltage is equal to the supply voltage.
Parameter Min. Max. Units
Supply Voltage ±20 V
Differential Input Current1±10 mA
Input Voltage2±15 V
Output Short-Circuit Duration2 Continuous
Operating Temperature Range -55 +125 °C
Storage Temperature Range -65 +150 °C
Lead Soldering Temperature (60 seconds) +300 °C
16-Lead DIP
(Top View)
2
3
4
+VS (A)
Comp (A)
Comp/VOS Trim (A)
-Input (A)
+Input (A)
-VS
NC
Output (B)
13
14
15
16
5
6
7
89
10
11
12 Comp/VOS Trim (B)
-Input (B)
+Input (B)
VOS Trim
NC
Output (A)
+VS (B)
Comp (B)
1
65-108A-02
8-Lead DIP
(Top View)
8-Lead Metal Can
(Top View)
1
8
1
2
345
6
72
3
4
Comp
Comp
-Input
-Input +Input
+Input -VS
-VS
5
6
7
8
NS
NC
Output
Output +VS
+VSComp
Comp
65-108A-01
PRODUCT SPECIFICATION LM108A/LH2108A
3
Thermal Characteristics
Electrical Characteristics
±5V, £ VS £ ±20V and TA £ +25°C unless otherwise noted
Notes:
1. Guaranteed by input bias current specification.
2. Sample tested.
Parameter 8-Lead
Metal Can 8-Lead
Ceramic DIP 16-Lead
Ceramic DIP
Maximum Junction Temperature +175°C +175°C +175°C
Max. PDTA < 50°C 658 mW 833 mW 1042 mW
Thermal Resistance, qJC 50°C/W 45°C/W 60°C/W
Thermal Resistance, qJA 190°C/W 150°C/W 120°C/W
For TA > 50°C Derate at 5.26 mW/°C 8.33 mW/°C 8.38 mW/°C
Parameters Test Conditlons
LM108A/LH2108A LM108/LH2108
UnitsMin. Typ. Max. Min. Typ. Max.
Input Offset Voltage 0.3 0.5 0.7 2.0 mV
Input Offset Current 0.05 0.2 0.05 0.2 nA
Input Bias Current 0.8 2.0 0.8 2.0 nA
Input Resistance1 30 70 30 70 MW
Large Signal Voltage
Gain VS = ±15V,
VOUT ±10V,
RL ³ 10KW
80 300 50 300 V/mV
Supply Current Each Amplifier 0.3 0.6 0.3 0.6 mA
±5V, £ VS £ ±20V; -55°C £ TA £ +25°C unless otherwise noted
Input Offset Voltage 0.4 1.0 1.0 3.0 mV
Avg. Input Offset
Voltage Drift21.0 5.0 3.0 15 mV/°C
Input Offset Current 0.1 0.4 0.1 0.4 nA
Avg. lnput Offset
Current Drift20.5 2.5 0.5 2.5 pA/°C
Input Bias Current 1.0 3.0 1.0 3.0 nA
Large Signal Voltage
Gain VS = ±15V,
VOUT = ±10V,
RL ³ 10 KW
40 200 25 200 V/mV
Output Voltage Swing RL ³ 10 KW,
VS = ±20V ±16 ±18 ±16 ±18 V
Input Voltage Range VS = ±15V ±13.5 ±13.5 V
Common Mode
Rejection Ratio VCM = ±13.5V,
VS = ±15V 96 110 85 100 dB
Power Supply Rejection
Ratio VS = ±15V 96 110 80 96 dB
Supply Current Each Amplifier 0.6 0.6 mA
LM108A/LH2108A PRODUCT SPECIFICATION
4
Figure 1. Offset Adjustment for Non-Inverting Amplifiers Figure 2. Standard Compensation Circuit
Figure 3. Offset Adjustment for Differential Amplifiers Figure 4. Alternate Frequency Compensation
Figure 5. Offset Adjustment for Inverting Amplifiers Figure 6. Feedforward Compensation
65-2652
6
2
3LM108
R5
VOUT
+VIN
R2
100
R4
R1
200K
+VS
R3
50K
-VSRange = ±VS
Gain = 1 +
R2
R1
(
(
(R5
R4 + R2
(
65-2653
6
2
3LM108
R2
VOUTR3
+VIN
-VIN
CF > R1 CL
R1 + R2
(
(
R1
CL = Load Capacitance
CF*
8
1
*Bandwidth and slew rate
are proportional to 1/CF
6
2
3LM108
R2
VOUT
-VIN
R5
20K
R1
+VS
R6
25K
-VSRange = ±VS
Gain =
R5
R4
(
(
R4
10
R1
R3
R2 = R3 + R4 R1
R1 + R3
(
(
R2
R1 65-2654
+VIN
65-2655
6
2
3LM108
R2
VOUT
R1
R3
+VIN
-VIN
8**
CS
100 pF
*Improves rejection of power supply noise by a factor of 10.
**Bandwidth and slew rate are proportional to 1/CS.
65-2650
6
2
3LM108
R3
VOUT
VIN
R2
100
R4
+VS
R5
50K
-VS
Range = ±VSR2
R1
(
(
R1
200K
65-2651
6
2
3
LM108
R2
10K
VOUT
VIN
R3
3K
R1
10K
C2
5 pF
8
1
C3
10 pF
C1
500 pF
Typical Applications
The LM108 series has very low input offset and bias
currents; the user is cautioned that printed circuit board
leakages can produce significant errors especially at high
board temperatures. Careful attention to board layout and
cleaning procedure is required to achieve the LM108A’s
rated performance. It is suggested that board leakage be
minimized by encircling the input pins with a guard ring
maintained at a potential close to that of the inputs. The
guard ring should be driv en by a low impedance source such
as an amplifier’s output or ground.
PRODUCT SPECIFICATION LM108A/LH2108A
5
Mechanical Dimensions
8-Lead TO-99 Metal Can
e1
kk1
e
a
REFERENCE
PLANE
øb
øb1
øD2
øD
øD1
AQ
F
L1
L2
L
BASE and
SEATING
PLANE
Notes:
1.
2.
3.
4.
5.
(All leads) øb applies between L1 & L2. øb1 applies between
L2 & .500 (12.70mm) from the reference plane. Diameter is
uncontrolled in L1 & beyond .500 (12.70mm) from the
reference plane.
Measured from the maximum diameter of the product.
Leads having a maximum diameter .019 (.48mm) measured in
gauging plane, .054 (1.37mm) +.001 (.03mm) –.000 (.00mm)
below the reference plane of the product shall be within
.007 (.18mm) of their true position relative to a maximum width
tab.
The product may be measured by direct methods or by gauge.
All leads – increase maximum limit by .003 (.08mm) when lead
finish is applied.
A .165 .185 4.19 4.70
Symbol Inches
Min. Max. Min. Max.
Millimeters Notes
øb .016 .019 .41 .48
.021 .53
øb1 .016 .41
øD .335 .375 8.51 9.52
øD1 .305 .335 7.75 8.51
øD2 .110 .160 2.79 4.06
.200 BSC 5.08 BSC
e.100 BSC 2.54 BSC
45¡ BSC 45¡ BSC
e1
F — .040 — 1.02
.027 .034 .69 .86
.027 .045 .69 1.14 2
1
1
1, 5
1, 5
a
k
k1
L .500 .750 12.70 19.05
— .050 — 1.27
.250 — 6.35 — 1
L1
L2 .010 .045 .25 1.14
Q
LM108A/LH2108A PRODUCT SPECIFICATION
6
Mechanical Dimensions (continued)
8-Lead Ceramic DIP
58
14
A — .200 — 5.08
Symbol Inches
Min. Max. Min. Max.
Millimeters Notes
b1 .014 .023 .36 .58
.065 1.65
b2 .045 1.14
c1 .008 .015 .20 .38
E .220 .310 5.59 7.87
e.100 BSC 2.54 BSC
L .125 .200 3.18 5.08
.015 .060 .38 1.52
.005 — .13 — 3
6
8
4
8
2, 8
4
5, 9
eA .300 BSC 7.62 BSC 7
Q
s1 90¡105¡90¡105¡
a
D — .405 — 10.29
Notes:
1.
2.
3.
4.
5.
6.
7.
8.
9.
Index area: a notch or a pin one identification mark shall be located
adjacent to pin one. The manufacturer's identification shall not be
used as pin one identification mark.
The minimum limit for dimension "b2" may be .023 (.58mm) for leads
number 1, 4, 5 and 8 only.
Dimension "Q" shall be measured from the seating plane to the base
plane.
This dimension allows for off-center lid, meniscus and glass overrun.
The basic pin spacing is .100 (2.54mm) between centerlines. Each
pin centerline shall be located within ±.010 (.25mm) of its exact
longitudinal position relative to pins 1 and 8.
Applies to all four corners (leads number 1, 4, 5, and 8).
"eA" shall be measured at the center of the lead bends or at the
centerline of the leads when "a" is 90¡.
All leads – Increase maximum limit by .003 (.08mm) measured at the
center of the flat, when lead finish applied.
Six spaces.
Note 1
D
E
s1
b2
Q
A
e
b1
L
eA
c1
a
PRODUCT SPECIFICATION LM108A/LH2108A
7
Mechanical Dimensions (continued)
16-Lead Ceramic DIP
A — .200 — 5.08
Symbol Inches
Min. Max. Min. Max.
Millimeters Notes
b1 .014 .023 .36 .58
.065 1.65
b2 .050 1.27
c1 .008 .015 .20 .38
E .220 .310 5.59 7.87
e.100 BSC 2.54 BSC
L .115 .160 2.92 4.06
.015 .060 .38 1.52
.005 — .13 — 3
6
8
4
8
2
4
5, 9
eA .300 BSC 7.62 BSC 7
Q
s1 90¡105¡90¡105¡
a
D .745 .840 18.92 21.33
Notes:
1.
2.
3.
4.
5.
6.
7.
8.
9.
Index area: a notch or a pin one identification mark shall be located
adjacent to pin one. The manufacturer's identification shall not be
used as pin one identification mark.
The minimum limit for dimension "b2" may be .023 (.58mm) for leads
number 1, 8, 9 and 16 only.
Dimension "Q" shall be measured from the seating plane to the base
plane.
This dimension allows for off-center lid, meniscus and glass overrun.
The basic pin spacing is .100 (2.54mm) between centerlines. Each
pin centerline shall be located within ±.010 (.25mm) of its exact
longitudinal position relative to pins 1 and 16.
Applies to all four corners (leads number 1, 8, 9, and 16).
"eA" shall be measured at the center of the lead bends or at the
centerline of the leads when "a" is 90¡.
All leads – Increase maximum limit by .003 (.08mm) measured at the
center of the flat, when lead finish applied.
Fourteen spaces.
NOTE 1
D
E
s1 916
81
Q
A
e
b1
L
eA
c1
a
PRODUCT SPECIFICATION LM108A/LH2108A
5/20/98 0.0m 001
Stock#DS3000108A
Ó 1998 Fairchild Semiconductor Corporation
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1.Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2.A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
Ordering Information
Note:
1./883B suffix denotes Mil-Std-883, Level B processing
Part Number Package Operation Temperature Range
LM108D 8-Lead Ceramic DIP -55°C to +125°C
LM108D/883B 8-Lead Ceramic DIP -55°C to +125°C
LM108AD 8-Lead Ceramic DIP -55°C to +125°C
LM108AD/883B 8-Lead Ceramic DIP -55°C to +125°C
LM108T 8-Lead Metal Can TO-99 -55°C to +125°C
LM108T/883B 8-Lead Metal Can TO-99 -55°C to +125°C
LM108AT 8-Lead Metal Can TO-99 -55°C to +125°C
LM108AT/883B 8-Lead Metal Can TO-99 -55°C to +125°C
LH2108D 16-Lead Ceramic DIP -55°C to +125°C
LH2108D/883B 16-Lead Ceramic DIP -55°C to +125°C
LH2108AD 16-Lead Ceramic DIP -55°C to +125°C
LH2108AD/883B 16-Lead Ceramic DIP -55°C to +125°C