LMC6001
Ultra Ultra-Low Input Current Amplifier
General Description
Featuring 100% tested input currents of 25 fA max., low op-
erating power, and ESD protection of 2000V, the LMC6001
achieves a new industry benchmark for low input current op-
erational amplifiers. By tightly controlling the molding com-
pound, National is able to offer this ultra-low input current in
a lower cost molded package.
To avoid long turn-on settling times common in other low in-
put current opamps, the LMC6001A is tested 3 times in the
first minute of operation. Even units that meet the 25 fA limit
are rejected if they drift.
Because of the ultra-low input current noise of 0.13 fA/
Hz,
the LMC6001 can provide almost noiseless amplification of
high resistance signal sources. Adding only 1 dB at 100 k
,
0.1 dB at 1 M
and 0.01 dB or less from 10 M
to 2,000 M
,
the LMC6001 is an almost noiseless amplifier.
The LMC6001 is ideally suited for electrometer applications
requiring ultra-low input leakage such as sensitive photode-
tection transimpedance amplifiers and sensor amplifiers.
Since input referred noise is only 22 nV/
Hz, the LMC6001
can achieve higher signal to noise ratio than JFET input type
electrometer amplifiers. Other applications of the LMC6001
include long interval integrators, ultra-high input impedance
instrumentation amplifiers, and sensitive electrical-field mea-
surement circuits.
Features
(Max limit, 25C unless otherwise noted)
n
Input current (100% tested):
25 fA
n
Input current over temp.:
2 pA
n
Low power:
750 A
n
Low V
OS
:
350 V
n
Low noise:
22 nV/
Hz
@
1 kHz Typ.
Applications
n
Electrometer amplifier
n
Photodiode preamplifier
n
Ion detector
n
A.T.E. leakage testing
Connection Diagrams
8-Pin DIP
DS011887-1
Top View
8-Pin Metal Can
DS011887-2
Top View
March 1995
LMC6001
Ultra
Ultra-Low
Input
Current
Amplifier
1999 National Semiconductor Corporation
DS011887
www.national.com
Ordering Information
Package
Industrial Temperature Range
NSC Package
-40C to +85C
Drawing
8-Pin
LMC6001AIN, LMC6001BIN,
N08E
Molded DIP
LMC6001CIN
8-Pin
LMC6001AIH, LMC6001BIH
H08C
Metal Can
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2
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Differential Input Voltage
Supply Voltage
Voltage at Input/Output Pin
(V
+
) + 0.3V, (V
-
) - 0.3V
Supply Voltage (V
+
- V
-
)
-0.3V to +16V
Output Short Circuit to V
+
(Notes 2, 10)
Output Short Circuit to V
-
(Note 2)
Lead Temperature
(Soldering, 10 Sec.)
260C
Storage Temperature
-65C to +150C
Junction Temperature
150C
Current at Input Pin
10 mA
Current at Output Pin
30 mA
Current at Power Supply Pin
40 mA
Power Dissipation
(Note 9)
ESD Tolerance (Note 9)
2 kV
Operating Ratings
(Note 1)
Temperature Range
LMC6001AI, LMC6001BI, LMC6001CI
-40C
T
J
+85C
Supply Voltage
4.5V
V
+
15.5V
Thermal Resistance (Note 11)
JA
, N Package
100C/W
JA
, H Package
145C/W
JC
, H Package
45C/W
Power Dissipation
(Note 8)
DC Electrical Characteristics
Limits in standard typeface guaranteed for T
J
= 25C and limits in boldface type apply at the temperature extremes. Unless
otherwise specified, V
+
= 5V, V
-
= 0V, V
CM
= 1.5V, and R
L
>
1M.
Symbol
Parameter
Conditions
Typical
(Note 4)
Limits (Note 5)
Units
LMC6001AI
LMC6001BI
LMC6001CI
I
B
Input Current
Either Input, V
CM
= 0V,
10
25
100
1000
fA
V
S
=
5V
2000
4000
4000
I
OS
Input Offset Current
5
1000
2000
2000
V
OS
Input Offset Voltage
0.35
1.0
1.0
mV
1.0
1.7
2.0
V
S
=
5V, V
CM
= 0V
0.7
1.35
1.35
1.35
2.0
TCV
OS
Input Offset
2.5
10
10
V/C
Voltage Drift
R
IN
Input Resistance
>
1
Tera
CMRR
Common Mode
0V
V
CM
7.5V
83
75
72
66
dB
min
Rejection Ratio
V
+
= 10V
72
68
63
+PSRR
Positive Power Supply
5V
V
+
15V
83
73
66
66
Rejection Ratio
70
63
63
-PSRR
Negative Power
0V
V
-
-10V
94
80
74
74
Supply Rejection Ratio
77
71
71
A
V
Large Signal
Sourcing, R
L
= 2 k
1400
400
300
300
V/mV
min
Voltage Gain
(Note 6)
300
200
200
Sinking, R
L
= 2 k
350
180
90
90
(Note 6)
100
60
60
V
CM
Input Common-Mode
V
+
= 5V and 15V
-0.4
-0.1
-0.1
-0.1
V
Voltage
For CMRR
60 dB
0
0
0
max
V
+
- 1.9
V
+
- 2.3
V
+
- 2.3
V
+
- 2.3
V
V
+
- 2.5
V
+
- 2.5
V
+
- 2.5
min
V
O
Output Swing
V
+
= 5V
4.87
4.80
4.75
4.75
V
R
L
= 2 k
to 2.5V
4.73
4.67
4.67
min
0.10
0.14
0.20
0.20
V
0.17
0.24
0.24
max
V
+
= 15V
14.63
14.50
14.37
14.37
V
R
L
= 2 k
to 7.5V
14.34
14.25
14.25
min
0.26
0.35
0.44
0.44
V
0.45
0.56
0.56
max
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3
DC Electrical Characteristics
(Continued)
Limits in standard typeface guaranteed for T
J
= 25C and limits in boldface type apply at the temperature extremes. Unless
otherwise specified, V
+
= 5V, V
-
= 0V, V
CM
= 1.5V, and R
L
>
1M.
Symbol
Parameter
Conditions
Typical
(Note 4)
Limits (Note 5)
Units
LMC6001AI
LMC6001BI
LMC6001CI
I
O
Output Current
Sourcing, V
+
= 5V,
22
16
13
13
mA
min
V
O
= 0V
10
8
8
Sinking, V
+
= 5V,
21
16
13
13
V
O
= 5V
13
10
10
Sourcing, V
+
= 15V,
30
28
23
23
V
O
= 0V
22
18
18
Sinking, V
+
= 15V,
V
O
= 13V (Note 10)
34
28
23
23
22
18
18
I
S
Supply Current
V
+
= 5V, V
O
= 1.5V
450
750
750
750
A
max
900
900
900
V
+
= 15V, V
O
= 7.5V
550
850
850
850
950
950
950
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4
AC Electrical Characteristics
Limits in standard typeface guaranteed for T
J
= 25C and limits in boldface type apply at the temperature extremes. Unless
otherwise specified, V
+
= 5V, V
-
= 0V, V
CM
= 1.5V and R
L
>
1M.
Symbol
Parameter
Conditions
Typical
Limits (Note 5)
Units
(Note 4)
LM6001AI
LM6001BI
LM6001CI
SR
Slew Rate
(Note 7)
1.5
0.8
0.8
0.8
V/s
0.6
0.6
0.6
min
GBW
Gain-Bandwidth Product
1.3
MHz
f
m
Phase Margin
50
Deg
G
M
Gain Margin
17
dB
e
n
Input-Referred Voltage Noise
F = 1 kHz
22
nV/
Hz
i
n
Input-Referred Current Noise
F = 1 kHz
0.13
fA/
Hz
THD
Total Harmonic Distortion
F = 10 kHz, A
V
= -10,
R
L
= 100 k
,
V
O
= 8 V
PP
0.01
%
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is in-
tended to be functional but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The
guaranteed specifications apply only for the test conditions listed.
Note 2: Applies to both single supply and split supply operation. Continuous short circuit operation at elevated ambient temperature can result in exceeding the maxi-
mum allowed junction temperature of 150C. Output currents in excess of
30 mA over long term may adversely affect reliability.
Note 3: The maximum power dissipation is a function of T
J(max)
,
JA
, and T
A
. The maximum allowable power dissipation at any ambient temperature is
P
D
= (T
J(max)
- T
A
)/
JA
.
Note 4: Typical values represent the most likely parametric norm.
Note 5: All limits are guaranteed by testing or statistical analysis.
Note 6: V
+
= 15V, V
CM
= 7.5V and R
L
connected to 7.5V. For Sourcing tests, 7.5V
V
O
11.5V. For Sinking tests, 2.5V
V
O
7.5V.
Note 7: V
+
= 15V. Connected as Voltage Follower with 10V step input. Limit specified is the lower of the positive and negative slew rates.
Note 8: For operating at elevated temperatures the device must be derated based on the thermal resistance
JA
with P
D
= (T
J
- T
A
)/
JA
.
Note 9: Human body model, 1.5 k
in series with 100 pF.
Note 10: Do not connect the output to V
+
, when V
+
is greater than 13V or reliability will be adversely affected.
Note 11: All numbers apply for packages soldered directly into a printed circuit board.
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