LT1055/LT1056
Precision, High Speed,
JFET Input Operational Amplifiers
FEATURES
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DESCRIPTION
The
LT
®
1055/LT1056
JFET input operational amplifiers
combine precision specifications with high speed per-
formance.
For the first time, 16V/µs slew rate and 6.5MHz gain
bandwidth product are simultaneously achieved with offset
voltage of typically 50µV, 1.2µV/°C drift, bias currents of
40pA at 70°C and 500pA at 125°C.
The 150µV maximum offset voltage specification is the
best available on any JFET input operational amplifier.
The LT1055 and LT1056 are differentiated by their operating
currents. The lower power dissipation LT1055 achieves
lower bias and offset currents and offset voltage. The ad-
ditional power dissipation of the LT1056 permits higher
slew rate, bandwidth and faster settling time with a slight
sacrifice in DC performance.
The voltage-to-frequency converter shown below is one
of the many applications which utilize both the precision
and high speed of the LT1055/LT1056.
For a JFET input op amp with 23V/µs guaranteed slew
rate, refer to the LT1022 data sheet.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
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Guaranteed
Offset Voltage: 150µV Max
–55°C to 125°C: 500µV Max
Guaranteed
Drift: 4µV/°C Max
Guaranteed
Bias Current
70°C: 150pA Max
125°C: 2.5nA Max
Guaranteed
Slew Rate: 12V/µs Min
Available in 8-Pin PDIP and SO Packages
APPLICATIONS
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Precision, High Speed Instrumentation
Logarithmic Amplifiers
D/A Output Amplifiers
Photodiode Amplifiers
Voltage-to-Frequency Converters
Frequency-to-Voltage Converters
Fast, Precision Sample-and-Hold
TYPICAL APPLICATION
1Hz to 10kHz Voltage-to-Frequency Converter
4.7k
15V
3M
0.001 (POLYSTYRENE)
NUMBER OF UNITS
10kHz
TRIM
5k
OUTPUT
1Hz TO 10kHz
0.005%
LINEARITY
140
120
100
80
60
40
20
0
–200
200
400
0
INPUT OFFSET VOLTAGE (µV)
LT1055/56 TA02
LT1055/56 TA01
Distribution of Input Offset Voltage
(H Package)
V
S
= ±15V
T
A
= 25°C
634 UNITS TESTED
FROM THREE RUNS
50% TO ±60µV
0V TO 10V
INPUT
75k
0.1µF
2
–
+
33pF
15V
7
LT1056
4
–15V
6
1.5k
22k
3
2N3906
= 1N4148
*1% FILM
–15V
3.3M
0.1µF
LM329
THE LOW OFFSET VOLTAGE OF LT1056
CONTRIBUTES ONLY 0.1Hz OF ERROR
WHILE ITS HIGH SLEW RATE PERMITS
10kHz OPERATION.
–400
10556fd
For more information
www.linear.com/LT1055
1
LT1055/LT1056
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltage .......................................................±20V
Differential Input Voltage ........................................±40V
Input Voltage ..........................................................±20V
Output Short-Circuit Duration .......................... Indefinite
Operating Temperature Range
LT1055AM/LT1055M/LT1056AM/
LT1056M
(OBSOLETE)
...................... –55°C to 125°C
LT1055AC/LT1055C/LT1056AC/
LT1056C .................................................. 0°C to 70°C
Storage Temperature Range
All Devices ......................................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
PIN CONFIGURATION
TOP VIEW
BAL 1
–IN 2
+IN 3
V
–
4
8
7
6
5
N/C
V
+
TOP VIEW
BAL 1
–IN 2
+IN 3
V
–
4
8
7
6
5
N/C
V
+
OUT
BAL
OUT
BAL
N8 PACKAGE
8-LEAD PDIP
T
JMAX
= 150°C,
θ
JA
= 130°C/W
TOP VIEW
NC
BALANCE 1
–IN 2
+IN 3
8
7
V
+
6 OUT
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 130°C/W
5 BALANCE
4
V
–
H PACKAGE
8-LEAD TO-5 METAL CAN
T
JMAX
= 150°C,
θ
JA
= 150°C/W,
θ
JC
= 45°C/W
Consider the N8 for Alternate Source
OBSOLETE PACKAGE
10556fd
2
For more information
www.linear.com/LT1055
LT1055/LT1056
ORDER INFORMATION
LEAD FREE FINISH
LT1055CN8#PBF
LT1056CN8#PBF
LT1055S8#PBF
LT1056S8#PBF
LT1055ACH#PBF
LT1055CH#PBF
LT1055AMH#PBF
LT1055MH#PBF
LT1056ACH#PBF
LT1056CH#PBF
LT1056AMH#PBF
LT1056MH#PBF
TAPE AND REEL
LT1055CN8#TRPBF
LT1056CN8#TRPBF
LT1055S8#TRPBF
LT1056S8#TRPBF
LT1055ACH#TRPBF
LT1055CH#TRPBF
LT1055AMH#TRPBF
LT1055MH#TRPBF
LT1056ACH#TRPBF
LT1056CH#TRPBF
LT1056AMH#TRPBF
LT1056MH#TRPBF
PART MARKING
LT1055CN8
LT1056CN8
1055
1056
LT1055ACH
LT1055CH
LT1055AMH
LT1055MH
LT1056ACH
LT1056CH
LT1056AMH
LT1056MH
PACKAGE DESCRIPTION
8-Lead PDIP
8-Lead PDIP
8-Lead Plastic SO
8-Lead Plastic SO
OBSOLETE PACKAGE
8-Lead TO-5 Metal Can
8-Lead TO-5 Metal Can
8-Lead TO-5 Metal Can
8-Lead TO-5 Metal Can
8-Lead TO-5 Metal Can
8-Lead TO-5 Metal Can
8-Lead TO-5 Metal Can
8-Lead TO-5 Metal Can
0°C to 70°C
0°C to 70°C
–55°C to 125°C
–55°C to 125°C
0°C to 70°C
0°C to 70°C
–55°C to 125°C
–55°C to 125°C
TEMPERATURE RANGE
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part markings, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
V
OS
Input Offset Voltage (Note 2)
CONDITIONS
LT1055 H Package
LT1056 H Package
LT1055 N8 Package
LT1056 N8 Package
Fully Warmed Up
Fully Warmed Up
V
CM
= 10V
T
A
= 25°C. V
S
= ±15V, V
CM
= 0V unless otherwise noted.
LT1055AM/LT1056AM
LT1055AC/LT1056AC
MIN
TYP
50
50
MAX
150
180
LT1055M/LT1056M
LT1055CH/LT1056CH
LT1055CN8/LT1056CN8
MIN
TYP
70
70
120
140
2
±10
30
10
12
10
12
10
11
4
2.0
2.8
50
20
4
120
100
±11
83
88
±12
30
15
1.8
400
300
±12
98
104
±13.2
60
22
4
MAX
400
450
700
800
20
±50
150
UNITS
µV
µV
µV
µV
pA
pA
pA
Ω
Ω
Ω
pF
µV
P-P
µV
P-P
nV/√Hz
nV/√Hz
fA/√Hz
V/mV
V/mV
V
dB
dB
V
10556fd
I
OS
I
B
Input Offset Current
Input Bias Current
Input Resistance:Differential
Input Capacitance
2
±10
30
10
12
10
12
10
11
4
1.8
2.5
28
14
1.8
150
130
±11
86
90
±12
400
300
±12
100
106
±13.2
10
±50
130
Common Mode V
CM
= –11V to 8V
V
CM
= 8V to 11V
0.1Hz to 10Hz
LT1055
LT1056
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Input Noise Voltage
Input Noise Voltage Density
f
O
= 10Hz (Note 3)
f
O
= 1kHz (Note 4)
f
O
= 10Hz, 1kHz (Note 5)
V
O
= ±10V
R
L
= 2k
R
L
= 1k
I
n
A
VOL
Input Noise Current Density
Large-Signal Voltage Gain
Input Voltage Range
CMRR
PSRR
V
OUT
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing
V
CM
= ±11V
V
S
= ±10V to ±18V
R
L
= 2k
For more information
www.linear.com/LT1055
3
LT1055/LT1056
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
SR
GBW
I
S
Slew Rate
Gain Bandwidth Product
Supply Current
Offset Voltage Adjustment Range R
POT
= 100k
f = 1MHz
CONDITIONS
LT1055
LT1056
LT1055
LT1056
LT1055
LT1056
T
A
= 25°C. V
S
= ±15V, V
CM
= 0V unless otherwise noted.t
LT1055AM/LT1056AM
LT1055AC/LT1056AC
MIN
10
12
TYP
13
16
5.0
6.5
2.8
5.0
±5
4.0
6.5
MAX
LT1055M/LT1056M
LT1055CH/LT1056CH
LT1055CN8/LT1056CN8
MIN
7.5
9.0
TYP
12
14
4.5
5.5
2.8
5.0
±5
4.0
7.0
MAX
UNITS
V/µs
V/µs
MHz
MHz
mA
mA
mV
The
l
denotes the specifications which apply over the temperature range 0°C ≤ T
A
≤ 70°C. V
S
= ±15V, V
CM
= 0V unless otherwise noted.
LT1055AC
LT1056AC
SYMBOL PARAMETER
V
OS
Input Offset Voltage (Note 2)
CONDITIONS
LT1055 H Package
LT1056 H Package
LT1055 N8 Package
LT1056 N8 Package
H Package (Note 6)
N8 Package (Note 6)
Warmed Up
T
A
= 70°C
Warmed Up
T
A
= 70°C
LT1055
LT1056
LT1055
LT1056
l
l
l
l
l
l
LT1055CH/LT1056CH
LT1055CN8/LT1056CN8
MAX
330
360
MIN
TYP
140
140
250
280
1.6
3.0
16
18
±40
±50
60
82
87
±12
250
98
103
±13.1
MAX
750
800
1250
1350
8.0
12.0
80
100
±200
±240
UNITS
µV
µV
µV
µV
µV/°C
µV/°C
pA
pA
pA
pA
V/mV
dB
dB
V
MIN
TYP
100
100
Average Temperature
Coefficient of Input Offset
Voltage
I
OS
I
B
A
VOL
CMRR
PSRR
V
OUT
Input Offset Current
Input Bias Current
Large-Signal Voltage Gain
1.2
4.0
l
l
l
l
l
l
l
l
10
14
±30
±40
80
85
89
±12
250
100
105
±13.1
50
70
±150
±80
V
O
= ±10V, R
L
= 2k
Common Mode Rejection Ratio V
CM
= ±10.5V
Power Supply Rejection Ratio
V
S
= ±10V to ±18V
Output Voltage Swing
R
L
= 2k
The
l
denotes the specifications which apply over the temperature range –55°C ≤ T
A
≤ 125°C. V
S
= ±15V, V
CM
= 0V, unless otherwise noted.
LT1055AM
LT1056AM
SYMBOL PARAMETER
V
OS
Input Offset Voltage (Note 2)
Average Temperature
Coefficient of Input Offset
Voltage
I
OS
I
B
A
VOL
CMRR
PSRR
V
OUT
Input Offset Current
Input Bias Current
Large-Signal Voltage Gain
(Note 6)
CONDITIONS
LT1055
LT1056
l
l
l
LT1055M
LT1056M
MAX
500
550
4.0
MIN
TYP
250
250
1.8
MAX
1200
1250
8.0
UNITS
µV
µV
µV/°C
MIN
TYP
180
180
1.3
Warmed Up
T
A
= 125°C
Warmed Up
T
A
= 125°C
LT1055
LT1056
LT1055
LT1056
l
l
l
l
l
l
l
l
0.20
0.25
±0.4
±0.5
40
85
88
±12
120
100
104
±12.9
1.2
1.5
±2.5
±3.0
35
82
86
±12
0.25
0.30
±0.5
±0.6
120
98
102
±12.9
1.8
2.4
±4.0
±5.0
nA
nA
nA
nA
V/mV
dB
dB
V
10556fd
V
O
= ±10V, R
L
= 2k
Common Mode Rejection Ratio V
CM
= ±10.5V
Power Supply Rejection Ratio
V
S
= ±10V to ±17V
Output Voltage Swing
R
L
= 2k
4
For more information
www.linear.com/LT1055
LT1055/LT1056
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
V
OS
I
OS
I
B
Input Offset Voltage (Note 2)
Input Offset Current
Input Bias Current
Input Resistance
Differential
Common Mode
Fully Warmed Up
Fully Warmed Up
V
CM
= 10V
V
CM
= –11V to 8V
V
CM
= 8V to 11V
0.1Hz to 10Hz
f
O
= 10Hz (Note 4)
f
O
= 1kHz (Note 4)
f
O
= 10Hz, 1kHz (Note 5)
V
O
= ±10V
R
L
= 2k
R
L
= 1k
120
100
±11
V
CM
= ±11V
V
S
= ±10V to ±18V
R
L
= 2K
LT1055
LT1056
f = 1MHz
LT1055
LT1056
LT1055
LT1056
R
POT
= 100k
83
88
±12
7.5
9.0
LT1055
LT1056
CONDITIONS
T
A
= 25°C. V
S
= ±15V, V
CM
= 0V unless otherwise noted.
LT1055CS8/LT1056CS8
MIN
TYP
500
5
±30
30
0.4
0.4
0.05
4
2.5
3.5
35
15
2.5
400
300
±12
98
104
±13.2
12
14
4.5
5.5
2.8
5.0
±5
4.0
7.0
70
22
10
MAX
1500
30
±100
150
UNITS
µV
pA
pA
pA
TΩ
TΩ
TΩ
pF
µV
P-P
µV
P-P
nV/√Hz
nV/√Hz
fA/√Hz
V/mV
V/mV
V
dB
dB
V
V/µs
V/µs
MHz
MHz
mA
mA
mV
Input Capacitance
e
n
Input Noise Voltage
Input Noise Voltage Density
i
n
A
VOL
Input Noise Current Density
Large-Signal Voltage Gain
Input Voltage Range
CMRR
PSRR
V
OUT
SR
GBW
I
S
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing
Slew Rate
Gain Bandwidth Product
Supply Current
Offset Voltage Adjustment Range
The
l
denotes the specifications which apply over the temperature range 0°C ≤ T
A
≤ 70°C. V
S
= ±15V, V
CM
= 0V unless otherwise noted.
LT1055CS8/LT1056CS8
SYMBOL PARAMETER
V
OS
I
OS
I
B
A
VOL
CMRR
PSRR
V
OUT
Input Offset Voltage (Note 2)
Average Temperature Coefficient of Input Offset Voltage
Input Offset Current
Input Bias Current
Large-Signal Voltage Gain
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing
Warmed Up, T
A
= 70°C
Warmed Up, T
A
= 70°C
V
O
= ±10V, R
L
= 2k
V
CM
= ±10.5V
V
S
= ±10V to ±18V
R
L
= 2K
CONDITIONS
l
l
l
l
l
l
l
l
MIN
TYP
800
4
18
±60
MAX
2200
15
150
±400
UNITS
µV
µV/°C
pA
pA
V/mV
dB
dB
V
60
82
87
±12
250
98
103
±13.1
10556fd
For more information
www.linear.com/LT1055
5
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