LT1024
Dual, Matched
Picoampere, Microvolt Input,
Low Noise Op Amp
DESCRIPTIO
The LT
®
1024 dual, matched internally compensated
universal precision operational amplifier can be used in
practically all precision applications requiring multiple op
amps. The LT1024 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. Extremely high
common mode and power supply rejection ratios,
practically immeasurable warm-up drift, and the ability to
deliver 5mA load current with a voltage gain of a million,
round out the LT1024’s superb precision specifications.
Tight matching is guaranteed on offset voltage,
noninverting bias currents and common mode and power
supply rejections.
The all-around excellence of the LT1024 eliminates the
necessity of the time-consuming error analysis procedure
of precision system design in many dual applications; the
LT1024 can be stocked as the universal dual op amp in the
14-pin DIP configuration.
For a single op amp with similar specifications, see the
LT1012 data sheet; for a single supply dual precision op
amp in the 8-pin configuration, see the LT1013 data sheet.
FEATURES
■
■
■
■
■
■
■
■
■
Guaranteed
Offset Voltage: 50µV Max
Guaranteed
Bias Current:
25°C: 120pA Max
–55°C to 125°C: 700pA Max
Guaranteed
Drift: 1.5µV/°C Max
Low Noise, 0.1Hz to 10Hz: 0.5µV
P-P
Guaranteed
Supply Current: 600µA Max
Guaranteed
CMRR: 112dB Min
Guaranteed
PSRR: 112dB Min
Guaranteed
Voltage Gain with 5mA Load Current
Guaranteed
Matching Characteristics
APPLICATIO S
■
■
■
■
■
■
■
■
Strain Gauge Signal Conditioner
Dual Limit Precision Threshold Detection
Charge Integrators
Wide Dynamic Range Logarithmic Amplifiers
Light Meters
Low Frequency Active Filters
Standard Cell Buffers
Thermocouple Amplifiers
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
R5
2.2k
†
R1*
100k
3
R2
10k
Two Op Amp Instrumentation Amplifier
R4
100k
Input Bias Current vs Temperature
100
INPUT BIAS CURRENT (pA)
50
UNDERCANCELLED UNIT
0
OVERCANCELLED UNIT
–50
–
1/2 LT1024
13
R3
10k
10
–
1/2 LT1024
6
OUTPUT
–
INPUTS
4
+
11
+
GAIN = R4 1 + 1
R3
2
+
TYPICAL PERFORMANCE:
OFFSET VOLTAGE = 20µV
BIAS CURRENT =
±30pA
OFFSET CURRENT = 30pA
–100
(
R2 + R3 + R2 + R3 ~ 100
R1 R4
R5
)
–150
–50 –25
* TRIM FOR COMMON-MODE REJECTION
†
TRIM FOR GAIN
LT1024 • TA01
U
U
U
50
25
0
75
TEMPERATURE (°C)
100
125
LTC1024 • TA02
1024fa
1
LT1024
ABSOLUTE
(Note 1)
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
NULL (A)
NULL (A)
–IN (A)
+IN (A)
V
–
(B)
1
2
3
4
5
6
7
–
+ A
B
14
V
+
(A)
13 OUT (A)
12 V
–
(A)
+
–
11 +IN (B)
10 –IN (B)
9
8
NULL (B)
NULL (B)
Supply Voltage ......................................................
±20V
Differential Input Current (Note 2) ......................
±10mA
Input Voltage .........................................................
±20V
Output Short Circuit Duration .......................... Indefinite
Operating Temperature Range
LT1024AM/LT1024M
(OBSOLETE).....–55°C
to 125°C
LT1024AC/LT1024C ................................ 0°C to 70°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER
PART NUMBER
LT1024ACN
LT1024CN
OUT (B)
V
+
(B)
N PACKAGE
14-PIN PDIP
T
JMAX
= 100°C,
θ
JA
= 100°C/W,
θ
JC
= 60°C/W (N)
NOTE: DEVICE MAY BE OPERATED EVEN IF
INSERTION IS REVERSED; THIS IS DUE
TO INHERENT SYMMETRY OF PIN LOCATIONS
OF AMPLIFIERS A AND B (NOTE 3)
D PACKAGE
14-PIN SIDE BRAZED (HERMETIC)
T
JMAX
= 150°C,
θ
JA
= 100°C/W,
θ
JC
= 60°C/W (D)
ORDER
PART NUMBER
LT1024AMD
LT1024MD
OBSOLETE PACKAGE
Consider the N14 Package as an Alternate Source
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
Individual Amplifiers. V
S
=
±15V,
V
CM
= 0V, T
A
= 25°C unless otherwise noted.
SYMBOL PARAMETER
V
OS
Input Offset Voltage
Long Term Input Offset Voltage Stability
I
OS
I
B
e
n
e
n
i
n
A
VOL
CMRR
PSRR
Input Offset Current
Input Bias Current
Input Noise Voltage
Input Noise Voltage Density
Input Noise Current Density
Large-Signal Voltage Gain
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Input Voltage Range
V
OUT
Output Voltage Swing
Slew Rate
I
S
Supply Current per Amplifier
R
L
= 10kΩ
0.1Hz to 10Hz
f
O
= 10Hz (Note 4)
f
O
= 1000Hz (Note 4)
f
O
= 10Hz
V
OUT
=
±12V,
R
L
≥
10kΩ
V
OUT
=
±10V,
R
L
≥
2kΩ
V
CM
=
±13.5V
V
S
=
±2V
to
±20V
250
150
112
112
±13.5
±13
0.1
CONDITIONS
LT1O24AM/LT1O24AC
MIN
TYP
MAX
15
0.3
20
±25
0.5
17
14
20
2000
1000
132
132
±14.0
±14
0.2
380
600
180
100
108
108
±13.5
±13
0.1
33
24
100
±120
50
LT1024M/LT1O24C
MIN
TYP
MAX
20
0.3
25
±30
0.5
17
14
20
2000
1000
132
132
±14.0
±14
0.2
380
700
33
24
180
±200
100
UNITS
µV
µV/month
pA
pA
µV
P-P
nV/√Hz
nV/√Hz
fA/√Hz
V/mV
V/mV
dB
dB
V
V
V/µs
µA
1024fa
2
U
W
U
U
W W
W
LT1024
ELECTRICAL CHARACTERISTICS
Matching Specifications. V
S
=
±15V,
V
CM
= 0V, T
A
= 25°C unless otherwise noted.
SYMBOL
PARAMETER
Input Offset Voltage Match
I
B +
I
OS+
∆CMRR
∆PSRR
Average Noninverting Bias
Current
Noninverting Offset Current
Common Mode Rejection Ratio
Match
Power Supply Rejection Ratio
Match
Channel Separation
V
CM
=
±13.5V
V
S
=
±2V
to 20V
f
≤
10Hz (Note 4)
110
110
134
CONDITIONS
LT1024AM/LT1024AC
MIN
TYP
MAX
20
±30
30
132
132
150
75
±150
150
106
106
134
LT1O24M /LT1O24C
MIN
TYP
MAX
25
±40
30
132
132
150
150
±250
300
UNITS
µV
pA
pA
dB
dB
dB
Individual Amplifiers. The
●
denotes the specifications which apply over the full operating temperature range of 0°C
≤
T
A
= 70°C for
the LT1024AC and LT1024C; – 55°C
≤
T
A
≤
125°C for the LT1024AM and LT1024M. V
S
=
±15V,
V
CM
= 0V, unless otherwise noted.
SYMBOL PARAMETER
V
OS
Input Offset Voltage
Average Temperature Coefficient of
Input Offset Voltage
I
OS
Input Offset Current
Average Temperature Coefficient of
Input Offset Current
I
B
Input Bias Current
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
0°C to 70°C
–55°C to 125°C
0°C to 70°C
–55°C to 125°C
V
OUT
=
±12V,
R
L
≥
10kΩ
V
OUT
=
±10V,
R
L
≥
2kΩ
V
CM
=
±13.5V
V
S
=
±2.5V
to
±18V
0°C to 70°C
–55°C to 125°C
CONDITIONS
0°C to 70°C
–55°C to 125°C
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
LT1024AM/LT1024AC
MIN
TYP
MAX
30
40
0.25
40
80
0.5
±40
±100
0.4
1
150
100
108
108
±13.5
±13
±14
400
800
1000
600
128
128
120
200
1.5
250
350
2.5
±250
±700
3
6
MIN
LT1024M/LT1024C
TYP
MAX
35
50
0.3
50
100
0.7
±50
±200
0.5
2
200
300
2.0
300
500
3
±400
±1300
4
12
UNITS
µV
µV
µV/°C
pA
pA
pA/°C
pA
pA
pA/°C
pA/°C
V/mV
V/mV
dB
dB
V
150
100
106
106
±13.5
±13
1000
600
128
128
±14
400
900
V
µA
1024fa
3
LT1024
Matching Specifications. The
●
denotes the specifications which apply over
the temperature range of 0°C
≤
T
A
= 70°C for the LT1024AC and LT1024C; – 55°C
≤
T
A
≤
125°C for the LT1024AM and LT1024M,
V
S
=
±15V,
V
CM
= 0V unless otherwise noted.
SYMBOL PARAMETER
Input Offset Voltage Match
Input Offset Voltage Tracking
I
B +
I
OS+
∆CMRR
∆PSRR
Average Noninverting Bias Current
Noninverting Offset Current
0°C to 70°C
–55°C to 125°C
0°C to 70°C
–55°C to 125°C
CONDITIONS
0°C to 70°C
–55°C to 125°C
●
●
●
●
●
●
●
●
●
ELECTRICAL CHARACTERISTICS
LT1024AM/LT1024AC
MIN
TYP
MAX
35
50
0.3
±40
±100
40
80
106
106
128
128
170
280
2
±300
±800
300
800
MIN
LT1024M/LT1024C
TYP
MAX
45
70
0.4
±50
±200
50
150
300
500
3.5
±500
±1400
500
1500
UNITS
µV
µV
µV/°C
pA
pA
pA
pA
dB
dB
Common Mode Rejection Ratio Match V
CM
=
±13.5V
Power Supply Rejection Ratio Match
V
S
=
±2.5V
to
±18V
104
104
128
128
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
Differential input voltages greater than 1V will cause excessive
current to flow through the input protection diodes unless limiting
resistance is used.
Note 3:
The V
+
supply terminals are completely independent and may be
powered by separate supplies if desired (this approach, however, would
sacrifice the advantages of the power supply rejection ratio matching). The
V
–
supply terminals are both connected to the common substrate and
must be tied to the same voltage. Both V
–
pins should be used.
Note 4:
This parameter is tested on a sample basis only.
Optional Offset Nulling Circuit
V+
5k TO 100k
POT
2 (9)
14 (7)
LT1024
13
(6)
OUTPUT
1 (8)
3
(10)
4
(11)
–
1/2
+
12 (5)
V–
INPUT OFFSET VOLTAGE CAN BE ADJUSTED
OVER A
±800µV
RANGE WITH A 5k TO
100k POTENTIOMETER
LT1024 • EC01
TYPICAL PERFOR A CE CHARACTERISTICS
Offset Voltage vs Source
Resistance (Balanced or Unbalanced)
1000
V
S
=
±15V
INPUT OFFSET VOLTAGE (µV)
100
– 55°C TO 125°C
25°C
10
INPUT OFFSET CURRENT (pA)
1
1k
3k
10k 30k 100k 300k 1M
SOURCE RESISTANCE (Ω)
3M 10M
LT1024 • TPC01
4
U W
Input Offset Current vs
Temperature
60
50
40
30
20
10
0
– 50 –25
V
S
=
±15V
V
CM
= 0V
50
25
75
0
TEMPERATURE (°C)
100
125
LT1024 • TPC02
1024fa
LT1024
TYPICAL PERFOR A CE CHARACTERISTICS
Input Bias Current Over
Common Mode Range
60
40
CHANGE IN OFFSET VOLTAGE (µV)
V
S
=
±15V
T
A
= 25°C
INPUT BIAS CURRENT (pA)
DEVICE WITH POSITIVE
INPUT CURRENT
R
IN CM
= 2 x 10
12
Ω
DEVICE WITH NEGATIVE
INPUT CURRENT
OFFSET VOLTAGE (µV)
20
0
–20
I
B
–40
V
CM
– 60
–15
–
+
10
–5
0
5
–10
COMMON MODE INPUT VOLTAGE (V)
Supply Current vs Supply
Voltage per Amplifier
500
NOISE VOLTAGE 400nV/DIVISION
VOLTAGE NOISE DENSITY (nV/√Hz)
CURRENT NOISE DENSITY (fA/√Hz)
SUPPLY CURRENT (µA)
400
25°C
125°C
–55°C
300
0
±10
±15
±
5
SUPPLY VOLTAGE (V)
Total Noise vs Source
Resistance
10.0
COMMON MODE REJECTION RATIO (dB)
TOTAL NOISE DENSITY (µV/√Hz)
AT 10Hz
AT 1kHz
120
100
80
60
40
20
0
1
V
S
=
±15V
T
A
= 25°C
10
10k
1k
100
FREQUENCY (Hz)
100k
1M
CMRR
MATCH
(∆CMRR)
POWER SUPPLY REJECTION RATIO (dB)
T
A
= 25°C
V
S
=
±2V
TO
±
20V
1.0
R
R
–
+
R
S
= 2R
0.1
AT 10Hz
AT 1kHz
0.01
10
2
RESISTOR NOISE
ONLY
10
8
10
3
10
4
10
5
10
6
10
7
SOURCE RESISTANCE (Ω)
U W
15
LT1024 • TPC03
LT1024 • TPC06
LT1024 • TPC09
Warm-Up Drift
5
60
V
S
=
±15V
T
A
= 25°C
40
20
Offset Voltage Drift and
Tracking with Temperatures of
Representative Units
V
S
=
±15V
2
1
1
0
–20
–40
–60
–50 –25
2
2
1 INDIVIDUAL AMPLIFIERS
2 TRACKING (MATCH DRIFT)
50
25
75
0
TEMPERATURE (°C)
100
125
4
3
2
1
0
0
1
3
4
2
TIME AFTER POWER ON (MINUTES)
5
LT1024 • TPC04
LT1024 • TPC05
0.1Hz to 10Hz Noise
T
A
= 25°C
V
S
±2V
TO
±
20V
Noise Spectrum
1000
T
A
= 25°C
V
S
±2
TO
±20V
100
CURRENT NOISE
VOLTAGE NOISE
10
1/f CORNER
2.5Hz
1/f CORNER
120Hz
1
1
10
100
FREQUENCY (Hz)
1000
LT1024 • TPC08
±
20
0
2
6
4
TIME (SECONDS)
8
10
LT1024 • TPC07
Common Mode Rejection and
CMRR Match vs Frequency
140
140
120
100
80
60
40
Power Supply Rejection vs
Frequency
V
S
=
±15V
T
A
= 25°C
POSITIVE
SUPPLY
NEGATIVE
SUPPLY
20
0.1
1
10
100 1k
10k
FREQUENCY (Hz)
100k
1M
LT1024 • TPC10
LT1024 • TPC11
1024fa
5
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