LT1012A/LT1012
Picoamp Input Current,
Microvolt Offset,
Low Noise Op Amp
DESCRIPTIO
The LT
®
1012 is an internally compensated universal
precision operational amplifier which can be used in
practically all precision applications. The LT1012
combines 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. The LT1012 achieves precision
operation on two Ni-Cad batteries with 1mW of power
dissipation. Extremely high common mode and
power supply rejection ratios, practically unmeasurable
warm-up drift, and the ability to deliver 5mA load current
with a voltage gain of one million round out the LT1012’s
superb precision specifications.
The all around excellence of the LT1012 eliminates the
necessity of the time consuming error analysis procedure
of precision system design in many applications; the
LT1012 can be stocked as the universal internally
compensated precision op amp.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Protected by U. S. patents 4,575,685 and 4,775,884
FEATURES
s
s
s
s
s
s
s
s
s
OP-07 Type Performance:
at 1/8th of OP-07’s Supply Current
at 1/20th of OP-07’s Bias and Offset Currents
Guaranteed
Offset Voltage: 25µV Max
Guaranteed
Bias Current: 100pA Max
Guaranteed
Drift: 0.6µV/°C Max
Low Noise, 0.1Hz to 10Hz: 0.5µV
P-P
Guaranteed
Low Supply Current: 500µA Max
Guaranteed
CMRR: 114dB Min
Guaranteed
PSRR: 114dB Min
Guaranteed
Operation at
±1.2V
Supplies
APPLICATIO S
s
s
s
s
s
s
s
Replaces OP-07 While Saving Power
Precision Instrumentation
Charge Integrators
Wide Dynamic Range Logarithmic Amplifiers
Light Meters
Low Frequency Active Filters
Thermocouple Amplifiers
TYPICAL APPLICATIO
R1
1M
–IN 3
R2
20k
2
R3
1M
+IN 7
6
4
R5
975k
±
250V Common Mode Range Instrumentation Amplifier (A
V
= 1)
200
Typical Distribution of Input
Offset Voltage
1140 UNITS
FROM THREE
RUNS
V
S
=
±15V
T
A
= 25°C
V
CM
= 0V
1
6V TO 18V
R6
25k
2
6
LT1012
3
OUT
R1 TO R6: VISHAY 444
ACCUTRACT THIN FILM
SIP NETWORK
X : VISHAY 444 PIN NUMBERS
VISHAY INTERTECHNOLOGY, INC
63 LINCOLN HIGHWAY
MALVERN, PA 19355
50k
OPTIONAL
CMRR
TRIM
160
–
+
7
NUMBER OF UNITS
120
COMMON
MODE
INPUT
±
250V
4
80
5
R4
19.608k
– 6V TO –18V
40
0
–40
COMMON MODE REJECTION RATIO = 74dB (RESISTOR LIMITED)
WITH OPTIONAL TRIM = 130dB
OUTPUT OFFSET (TRIMMABLE TO ZERO) = 500µV
OUTPUT OFFSET DRIFT = 10µV/°C
INPUT RESISTANCE = 1M
LT1012A • TA01
U
U
U
20
40
–20
0
INPUT OFFSET VOLTAGE (µV)
LT1012A • TA02
sn1012 1012afbs
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LT1012A/LT1012
ABSOLUTE
AXI U
RATI GS
Supply Voltage ......................................................
±
20V
Differential Input Current (Note 1) ......................
±
10mA
Input Voltage .........................................................
±
20V
Output Short Circuit Duration .......................... Indefinite
PACKAGE/ORDER I FOR ATIO
TOP VIEW
VOS
TRIM
–IN
+IN
V
–
1
2
3
4
–
+
8
7
6
5
VOS
TRIM
V
+
OUT
OVER
COMP
V
OS
TRIM
1
–IN
2
+IN
3
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
=
100°C,
θ
JA
= 170°C/W
H PACKAGE
8-LEAD TO-5 METAL CAN
T
JMAX
= 150°C,
θ
JA
= 150°C/W,
θ
JC
= 45°C/W
ORDER PART NUMBER
LT1012S8
LT1012IS8
LT1012ACS8
LT1012AIS8
S8 PART MARKING
1012
1012I
1012A
1012AI
ORDER PART NUMBER
LT1012AMH
LT1012MH
LT1012ACH
LT1012CH
LT1012DH
OBSOLETE PACKAGE
Consider the S8 or N8 Packages for Alternate Source
Consult LTC Marketing for parts specified with wider operating temperature ranges.
2
U
U
W
W W
U
W
(Note 1)
Operating Temperature Range
LT1012AM/LT1012M
(OBSOLETE)....–
55°C to 125°C
LT1012I/LT1012AI ............................. – 40°C to 85°C
LT1012AC/LT1012C
LT1012D/LT1012S8 ................................ 0°C to 70°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
TOP VIEW
V
OS
TRIM
8
–
+
TOP VIEW
+
7
V
VOS
TRIM
–IN
+IN
V
–
1
2
3
4
N8 PACKAGE
8-LEAD PDIP
–
+
8
7
6
5
VOS
TRIM
V
+
OUT
OVER
COMP
6
OUT
5
OVER
4
COMP
V
–
(CASE)
T
JMAX
= 100°C,
θ
JA
= 130°C/W
ORDER PART NUMBER
LT1012ACN8
LT1012AIN8
LT1012CN8
LT1012DN8
LT1012IN8
sn1012 1012afbs
LT1012A/LT1012
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
V
OS
Input Offset Voltage
(Note 3)
Long Term Input Offset
Voltage Stability
l
OS
I
B
e
n
e
n
i
n
A
VOL
CMRR
PSRR
Input Offset Current
(Note 3)
Input Bias Current
(Note 3)
Input Noise Voltage
Input Noise Voltage Density
lnput Noise Current Density
Large-Signal Voltage Gain
0.1Hz to 10Hz
f
O
= 10Hz (Note 5)
f
O
= 1000Hz (Note 5)
f
O
= 10Hz
V
OUT
=
±12V,R
L
≥
10kΩ
V
OUT
=
±10V,R
L
≥
2kΩ
V
S
=
±1.2V
to
±
20V
CONDITIONS
V
S
=
±
15V, V
CM
= 0V, T
A
= 25°C, unless otherwise noted.
MIN
LT1012D
TYP
12
25
0.3
20
30
±30
±40
0.5
17
14
20
200
200
110
110
±13.5
2000
1000
132
132
±14.0
±14
0.2
380
600
200
120
110
110
±13.5
±13
0.1
30
22
150
±
150
MAX
60
MIN
LT1012S8
TYP
15
25
0.4
50
60
±80
±120
0.5
17
14
20
2000
1000
132
132
±14.0
±14
0.2
380
600
30
22
280
380
±300
±400
MAX
120
180
UNITS
µV
µV
µV/month
pA
pA
pA
pA
µV
P-P
nV√Hz
nV√Hz
fA/√Hz
V/mV
V/mV
dB
dB
V
V
V/µs
µA
Common Mode Rejection Ratio V
CM
=
±13.5V
Power Supply Rejection Ratio
Input Voltage Range
V
OUT
Output Voltage Swing
Slew Rate
R
L
= 10kΩ
±13
0.1
I
S
Supply Current
(Note 3)
sn1012 1012afbs
4
LT1012A/LT1012
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
V
OS
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
Large-Signal Voltage Gain
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Input Voltage Range
V
OUT
I
S
Output Voltage Swing
Supply Current
R
L
= 10kΩ
The
q
denotes the specifications which apply over the full operating
temperature range of –55°C
≤
T
A
≤
125°C for LT1012AM and LT1012M, and –40°C
≤
T
A
≤
85°C for LT1012AI and LT1012I.
V
S
=
±
15V, V
CM
= 0V, unless otherwise noted.
CONDITIONS
q
q
q
LT1012AM/AI
MIN
TYP
MAX
30
40
0.2
30
70
0.3
±80
±150
0.6
200
200
110
110
±13.5
±13
±14
400
650
1000
600
128
126
60
180
0.6
250
350
2.5
±600
±800
6.0
MIN
LT1012M/I
TYP
30
40
0.2
30
70
0.3
±80
±150
0.6
MAX
180
250
1.5
250
350
2.5
±600
±800
6.0
UNITS
µV
µV
µV/°C
pA
pA
pA/°C
pA
pA
pA/°C
V/mV
V/mV
dB
dB
V
q
q
q
q
q
q
V
OUT
=
±12V,
R
L
≥
10kΩ
V
OUT
=
±10V,
R
L
≥
2kΩ
V
CM
=
±13.5V
V
S
=
±1.5V
to
±
20V
q
q
q
q
q
q
q
150
100
108
108
±13.5
±13
1000
600
128
126
±14
400
800
V
µA
sn1012 1012afbs
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PCB Design
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