LT1008
Picoamp Input Current,
Microvolt Offset,
Low Noise Op Amp
DESCRIPTIO
The LT
®
1008 is a universal precision operational amplifier
that can be used in practically all precision applications.
The LT1008 combines for the first time, picoampere bias
currents (which are maintained over the full – 55°C to
125°C temperature range), microvolt offset voltage (and
low drift with time and temperature), low voltage and
current noise, and low power dissipation. Extremely high
common mode and power supply rejection ratios, and the
ability to deliver 5mA load current with high voltage gain
round out the LT1008’s superb precision specifications.
The all around excellence of the LT1008 eliminates the
necessity of the time consuming error analysis procedure
of precision system design in many applications; the
LT1008 can be stocked as the universal precision op amp.
The LT1008 is externally compensated with a single ca-
pacitor for additional flexibility in shaping the frequency
response of the amplifier. It plugs into and upgrades all
standard LM108A/LM308A applications. For an internally
compensated version with even lower offset voltage but
otherwise similar performance see the LT1012.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
FEATURES
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■
■
■
■
Guaranteed Bias Current
T
A
= 25°C: 100pA Max
T
A
= – 55°C to 125°C: 600pA Max
Guaranteed Offset Voltage: 120μV Max
Guaranteed Drift: 1.5μV/°C Max
Low Noise, 0.1Hz to 10Hz: 0.5μV
P-P
Guaranteed Low Supply Current: 600μA Max
Guaranteed CMRR: 114dB Min
Guaranteed PSRR: 114dB Min
Guaranteed Voltage Gain with 5mA Load Current
Available in 8-Lead PDIP and SO Packages
APPLICATIO S
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Precision Instrumentation
Charge Integrators
Wide Dynamic Range Logarithmic Amplifiers
Light Meters
Low Frequency Active Filters
Standard Cell Buffers
Thermocouple Amplifiers
TYPICAL APPLICATIO
Input Amplifier for 4.5 Digit Voltmeter
100
Input Bias Current vs Temperature
1000pF
1
INPUT
0.1V
1V
9M
10V
900k
100V
90k
1000V
10k
FN507
ALLEN BRADLEY
DECADE VOLTAGE DIVIDER
100k
5%
15V
8
7
LT1008
6
9k*
0.1V
1V
10V
100V
1k*
1000V TO 1V FULL-SCALE
ANALOG-TO-DIGITAL
CONVERTER
INPUT BIAS CURRENT (pA)
50
UNDERCANCELLED UNIT
0
OVERCANCELLED UNIT
–50
+
3
–
2
4
–15V
–100
*RATIO MATCH
±0.01%
THIS APPLICATION REQUIRES LOW
BIAS CURRENT AND OFFSET VOLTAGE,
LOW NOISE AND LOW DRIFT WITH
TIME AND TEMPERATURE
1008 TA01
–150
–50 –25
U
U
U
50
25
0
75
TEMPERATURE (°C)
100
125
1008 TA02
1008fb
1
LT1008
ABSOLUTE
AXI U
RATI GS
(Note 1)
Operating Temperature Range
LT1008M
(OBSOLETE) ...............
– 55°C to 125°C
LT1008C ................................................. 0°C to 70°C
LT1008I ............................................. – 40°C to 85°C
Lead Temperature (Soldering, 10 sec).................. 300°C
Supply Voltage ......................................................
±20V
Differential Input Current (Note 2) .....................
±10mA
Input Voltage ........................................................
±20V
Output Short-Circuit Duration ......................... Indefinite
Storage Temperature Range ................. – 65°C to 150°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
COMP2
8
COMP1 1
–IN 2
+IN 3
4
V
–
(CASE)
H PACKAGE
8-LEAD TO-5 METAL CAN
T
JMAX
= 150°C,
θ
JA
= 150°C/W,
θ
JC
= 45°C/W
COMP1 1
7 V
+
6 OUT
5 NC
–IN 2
+IN 3
V
–
4
–
+
N8 PACKAGE
8-LEAD PDIP
T
JMAX
= 150°C,
θ
JA
= 130°C/W
J8 PACKAGE 8-LEAD CERDIP
T
JMAX
= 150°C,
θ
JA
= 100°C/W
ORDER PART
NUMBER
LT1008MH
LT1008CH
ORDER PART
NUMBER
LT1008MJ8
LT1008CJ8
OBSOLETE PACKAGES
Consider N8 or S8 Package for Alternate Source
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
SYMBOL
V
OS
PARAMETER
Input Offset Voltage
V
S
=
±15V,
V
CM
= 0V, T
A
= 25°C, unless otherwise noted.
LT1008M/I
MIN TYP MAX
30
40
0.3
30
40
120
180
100
150
LT1008C
MIN TYP MAX
30
40
0.3
30
40
100
150
120
180
UNITS
μV
μV
μV/Month
pA
pA
pA
pA
μV
P-P
30
22
nV√Hz
nV/√Hz
fA/√Hz
V/mV
V/mV
1008fb
CONDITIONS
(Note 3)
Long-Term Input Offset Voltage Stability
I
OS
I
B
e
n
Input Offset Current
(Note 3)
Input Bias Current
(Note 3)
Input Noise Voltage
Input Noise Voltage Density
i
n
A
VOL
Input Noise Current Density
Large-Signal Voltage Gain
0.1Hz to 10Hz
f
O
= 10Hz (Note 4)
f
O
= 1000Hz (Note 5)
f
O
= 10Hz
V
OUT
=
±12V,
R
L
≥
10k
V
OUT
=
±10V,
R
L
≥
2k
200
120
2
U
U
W
W W
U
W
TOP VIEW
TOP VIEW
8
7
6
5
COMP2
V
+
OUT
NC
COMP1 1
–IN 2
+IN 3
V
–
4
8
7
6
5
COMP2
V
+
OUT
NC
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 190°C/W
ORDER PART
NUMBER
LT1008CN8
LT1008IN8
ORDER PART
NUMBER
LT1008S8
S8 PART
MARKING
1008
Order Options
Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
±30 ±100
±40 ±150
0.5
17
14
20
2000
600
200
120
30
22
±30 ±100
±40 ±150
0.5
17
14
20
2000
600
LT1008
ELECTRICAL CHARACTERISTICS
SYMBOL
CMRR
PSRR
V
OUT
I
S
PARAMETER
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Input Voltage Range
Output Voltage Swing
Slew Rate
Supply Current
V
S
=
±15V,
V
CM
= 0V, T
A
= 25°C, unless otherwise noted.
LT1008M/I
MIN TYP MAX
114
114
±13
0.1
132
132
±14
0.2
380
600
LT1008C
MIN TYP MAX
114
114
±13
0.1
132
132
±14
0.2
380
600
UNITS
dB
dB
V
V
V/μs
μA
CONDITIONS
V
CM
=
±13.5V
V
S
=
±2V
to
±20V
R
L
= 10k
C
F
= 30pF
(Note 3)
±13.5 ±14
±13.5 ±14
The
●
indicates specifications which apply over the full operating temperature range of – 55°C
≤
T
A
≤
125°C for the LT1008M, – 40°C
≤
T
A
≤
85°C for the LT1008I and 0°C
≤
T
A
≤
70°C for the LT1008C. V
S
=
±15V,
V
CM
= 0V, unless otherwise noted.
SYMBOL
V
OS
PARAMETER
Input Offset Voltage
(Note 3)
Average Temperature Coefficient of
Input Offset Voltage
I
OS
Input Offset Current
(Note 3)
Average Temperature Coefficient of
Input Offset Current
I
B
Input Bias Current
(Note 3)
Average Temperature Coefficient of
Input Bias Current
A
VOL
CMRR
PSRR
V
OUT
I
S
Large-Signal Voltage Gain
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Input Voltage Range
Output Voltage Swing
Supply Current
R
L
= 10k
V
OUT
=
±12V,
R
L
≥
10k
V
CM
=
±13.5V
V
S
=
±2.5V
to
±20V
CONDITIONS
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
LT1008M/I
MIN TYP MAX
50
60
0.2
60
80
0.4
250
320
1.5
250
350
2.5
LT1008C
MIN TYP MAX
40
50
0.2
40
50
0.4
180
250
1.5
180
250
2.5
UNITS
μV
μV
μV/°C
pA
pA
pA/°C
pA
pA
pA/°C
V/mV
dB
dB
V
V
±80 ±600
±150 ±800
0.6
100
108
108
±13.5
±13
±14
400
800
1000
128
126
6
110
110
±13.5
±13
±40 ±180
±50 ±250
0.4
150 1500
130
128
±14
400
800
2.5
μA
(LT1008S8 only) V
S
=
±15V,
V
CM
= 0V, T
A
= 25°C, unless otherwise noted.
SYMBOL
V
OS
PARAMETER
Input Offset Voltage
(Note 3)
Long-Term Input Offset Voltage Stability
I
OS
I
B
e
n
Input Offset Current
(Note 3)
Input Bias Current
(Note 3)
Input Noise Voltage
Input Noise Voltage Density
0.1Hz to 10Hz
f
O
= 10Hz (Note 5)
f
O
= 1000Hz (Note 5)
CONDITIONS
MIN
TYP
30
40
0.3
100
120
±100
±120
0.5
17
14
30
22
280
380
±300
±400
MAX
200
250
UNITS
μV
μV
μV/Month
pA
pA
pA
pA
μV
P-P
nV/√Hz
nV/√Hz
1008fb
3
LT1008
ELECTRICAL CHARACTERISTICS
SYMBOL
i
n
A
VOL
CMRR
PSRR
V
OUT
I
S
PARAMETER
Input Noise Current Density
Large-Signal Voltage Gain
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Input Voltage Range
Output Voltage Swing
Slew Rate
Supply Current
(LT1008S8 only) V
S
=
±15V,
V
CM
= 0V, T
A
= 25°C, unless otherwise noted.
MIN
200
120
110
110
±13.5
±13
0.1
TYP
20
2000
600
132
132
±14
±14
0.2
380
600
MAX
UNITS
fA/√Hz
V/mV
V/mV
dB
dB
V
V
V/μs
μA
CONDITIONS
f
O
= 10Hz
V
OUT
=
±12V,
R
L
≥
10k
V
OUT
=
±10V,
R
L
≥
2k
V
CM
=
±13.5V
V
S
=
±2V
to
±20V
R
L
= 10k
C
F
= 30pF
(Note 3)
(LT1008S8 only) The
●
indicates specifications which apply over the full operating temperature range of 0°C
≤
T
A
≤
70°C.
V
S
=
±15V,
V
CM
= 0V, unless otherwise noted.
SYMBOL
V
OS
PARAMETER
Input Offset Voltage
(Note 3)
Average Temperature Coefficient of
Input Offset Voltage
I
OS
Input Offset Current
(Note 3)
Average Temperature Coefficient of
Input Offset Current
I
B
Input Bias Current
(Note 3)
Average Temperature Coefficient of
Input Bias Current
A
VOL
CMRR
PSRR
V
OUT
I
S
Large-Signal Voltage Gain
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Input Voltage Range
Output Voltage Swing
Supply Current
R
L
= 10k
V
OUT
=
±12V,
R
L
≥
10k
V
CM
=
±13.5V
V
S
=
±2.5V
to
±20V
CONDITIONS
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
MIN
TYP
40
50
0.2
120
140
0.4
±120
±140
0.4
MAX
280
340
1.8
380
500
4
±420
±550
5
UNITS
μV
μV
μV/°C
pA
pA
pA/°C
pA
pA
pA/°C
V/mV
dB
dB
V
V
150
108
108
±13.5
±13
1500
130
128
±14
400
800
μA
Note 1:Stresses
beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
Differential input voltages greater than 1V will cause excessive
current to flow through the input protection diodes unless current limiting
resistors are used.
Note 3:
These specifications apply for
±2V ≤
V
S
≤ ±20V
(±2.5V
≤
V
S
≤ ±20V
over the temperature range) and
–13.5V
≤
V
CM
≤
13.5V (for V
S
=
±15V).
Note 4:
10Hz noise voltage density is sample tested on every lot. Devices
100% tested at 10Hz are available on request.
Note 5:
This parameter is tested on a sample basis only.
1008fb
4
LT1008
FREQUE CY CO PE SATIO CIRCUITS
Standard Compensation Circuit
R1
–V
IN
R2
+V
IN
1
C
F
**
R1C
O
R1 + R2
C
O
= 30pF
C
F
≥
1008 FCC01
+V
IN
FOR
R2
> 200, NO EXTERNAL FREQUENCY COMPENSATION IS NECESSARY
R1
TYPICAL PERFOR A CE CHARACTERISTICS
Offset Voltage Drift vs Source
Resistance (Balanced or
Unbalanced)
100
OFFSET VOLTAGE DRIFT WITH TEMPERATURE (μV/°C)
Offset Voltage vs Source
Resistance (Balanced or
Unbalanced)
10
V
S
=
±15V
T
A
= 25°C
INPUT BIAS CURRENT (pA)
60
40
INPUT OFFSET VOLTAGE (mV)
10
1
MAXIMUM
1
MAXIMUM
0.1
TYPICAL
I
B
TYPICAL
0.1
1k
10k
100k
1M
10M
SOURCE RESISTANCE (Ω)
100M
1008 G01
–40
–60
–15
V
CM
0.01
1k
100k
1M
10M
10k
SOURCE RESISTANCE (Ω)
100M
1008 G02
10
–5
0
5
–10
COMMON MODE INPUT VOLTAGE (V)
Warm-Up Drift
5
Long-Term Stability of Four
Representative Units
10
CHANGE IN OFFSET VOLTAGE (μV)
8
6
4
2
0
–2
–4
–6
–8
OFFSET VOLTAGE (μV)
40
20
0
–20
–40
60
Offset Voltage Drift with
Temperature of Four
Representative Units
CHANGE IN OFFSET VOLTAGE (μV)
V
S
=
±15V
T
A
= 25°C
4
3
2
METAL CAN (H) PACKAGE
DUAL-IN-LINE PACKAGE
PLASTIC (N) OR CERDIP (J)
1
0
0
1
3
4
2
TIME AFTER POWER ON (MINUTES)
5
–10
0
1
3
2
TIME (MONTHS)
4
5
1008 G05
–60
–50
–25
50
25
75
0
TEMPERATURE (°C)
1008 G04
+
–
+
U W
+
R3
LT1008
3
8
6
V
OUT
3
–
–
2
**BANDWIDTH AND SLEW RATE
ARE PROPORTIONAL TO 1/C
F
U
U W
U
Alternate* Frequency Compensation
R1
–V
IN
2
R2
*IMPROVES REJECTION OF POWER
SUPPLY NOISE BY A FACTOR OF 5
**BANDWIDTH AND SLEW RATE ARE
PROPORTIONAL TO 1/C
S
V
OUT
LT1008
8
6
C
S
**
100pF
1008 FCC02
Input Bias Current vs
Common Mode Range
V
S
=
±15V
T
A
= 25°C
DEVICE WITH POSITIVE INPUT CURRENT
20
R
INCM
= 2
×
10
12
Ω
0
–20
DEVICE WITH NEGATIVE INPUT CURRENT
15
1008 G03
100
125
1008 G06
1008fb
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