LT1055/LT1056
Precision, High Speed,
JFET Input Operational Amplifiers
FEATURES
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DESCRIPTIO
■
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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
The LT
®
1055/LT1056 JFET input operational amplifiers
combine precision specifications with high speed perfor-
mance.
For the first time, 16V/µs slew rate and 6.5MHz gain
bandwidth product are simultaneously achieved with off-
set 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 operat-
ing currents. The lower power dissipation LT1055 achieves
lower bias and offset currents and offset voltage. The
additional 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.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
APPLICATIO S
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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 APPLICATIO
4.7k
15V
1Hz to 10kHz Voltage-to-Frequency Converter
3M
0.001 (POLYSTYRENE)
10kHZ
TRIM
5k
OUTPUT
1Hz TO 10kHz
0.005%
LINEARITY
0V TO 10V
INPUT
75k
2
–
+
33pF
15V
7
LT1056
6
4
–15V
1.5k
NUMBER OF UNITS
0.1µF
22k
3
3.3M
2N3906
= 1N4148
*1% FILM
–15V
0.1µF
THE LOW OFFSET VOLTAGE OF LT1056
CONTRIBUTES ONLY 0.1Hz OF ERROR
WHILE ITS HIGH SLEW RATE PERMITS
10kHz OPERATION.
LM329
LT1055/56 TA01
U
Distribution of Input Offset Voltage
(H Package)
140
120
100
80
60
40
20
0
–400
200
–200
400
0
INPUT OFFSET VOLTAGE (µV)
LT1055/56 TA02
U
U
V
S
=
±15V
T
A
= 25°C
634 UNITS TESTED
FROM THREE RUNS
50% TO
±60µV
10556fc
1
LT1055/LT1056
ABSOLUTE
MAXIMUM
RATINGS
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
PACKAGE/ORDER INFORMATION
TOP VIEW
BAL 1
–IN 2
+IN
3
V
–
ORDER PART
NUMBER
8
7
6
5
N/C
V
+
OUT
BAL
BAL 1
LT1055CN8
LT1056CN8
4
N8 PACKAGE
8-LEAD PDIP
T
JMAX
= 150°C,
θ
JA
= 130°C/ W
TOP VIEW
NC
8
BALANCE
1
–IN 2
7
V
+
6
OUT
5
BALANCE
4
V
–
H PACKAGE
8-LEAD TO-5 METAL CAN
+IN
3
T
JMAX
= 150°C,
θ
JA
= 150°C/ W,
θ
JC
= 45°C/ W
OBSOLETE PACKAGE
Consider the N8 Package for Alternate Source
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/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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
T
A
= 25°C. V
S
=
±15V,
V
CM
= 0V unless otherwise noted.
LT1055AM/LT1056AM
LT1055AC/LT1056AC
MIN
TYP
MAX
—
—
—
—
—
50
50
—
—
2
150
180
—
—
10
LT1055M/LT1056M
LT1055CH/LT1056CH
LT1055CN8/LT1056CN8
MIN
TYP
MAX
—
—
—
—
—
70
70
120
140
2
400
450
700
800
20
I
OS
Input Offset Current
2
U
U
W
W W
U
W
(Note 1)
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
TOP VIEW
8
7
6
5
N/C
V
+
OUT
BAL
ORDER PART
NUMBER
–IN 2
+IN
3
V
–
LT1055S8
LT1056S8
S8 PART
MARKING
1055
1056
4
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 150°C/ W
ORDER PART
NUMBER
LT1055ACH
LT1055CH
LT1055AMH
LT1055MH
LT1056ACH
LT1056CH
LT1056AMH
LT1056MH
UNITS
µV
µV
µV
µV
pA
10556fc
LT1055/LT1056
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
I
B
Input Bias Current
Input Resistance:Differential
CONDITIONS
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
MAX
—
—
—
—
—
—
—
—
—
—
—
150
130
±11
86
90
±12
10
12
—
—
—
—
—
±10
30
10
12
10
12
10
11
4
1.8
2.5
28
14
1.8
400
300
±12
100
106
±13.2
13
16
5.0
6.5
2.8
5.0
±5
±50
130
—
—
—
—
—
—
50
20
4
—
—
—
—
—
—
—
—
—
—
4.0
6.5
—
LT1055M/LT1056M
LT1055CH/LT1056CH
LT1055CN8/LT1056CN8
MIN
TYP
MAX
—
—
—
—
—
—
—
—
—
—
—
120
100
±11
83
88
±12
7.5
9.0
—
—
—
—
—
±10
30
10
12
10
12
10
11
4
2.0
2.8
30
15
1.8
400
300
±12
98
104
±13.2
12
14
4.5
5.5
2.8
5.0
±5
±50
150
—
—
—
—
—
—
60
22
4
—
—
—
—
—
—
—
—
—
—
4.0
7.0
—
UNITS
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
V/µs
V/µs
MHz
MHz
mA
mA
mV
Common Mode V
CM
= –11V to 8V
V
CM
= 8V to 11V
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 R
POT
= 100k
f = 1MHz
V
CM
=
±11V
V
S
=
±10V
to
±18V
R
L
= 2k
LT1055
LT1056
LT1055
LT1056
LT1055
LT1056
0.1Hz to 10Hz
LT1055
LT1056
f
0
= 10Hz (Note 3)
f
0
= 1kHz (Note 4)
f
0
= 10Hz, 1kHz (Note 5)
V
0
=
±10V
R
L
= 2k
R
L
= 1k
The
●
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
TYP
100
100
—
—
1.2
—
10
14
±30
±40
250
100
105
±13.1
LT1055CH/LT1056CH
LT1055CN8/LT1056CN8
MIN
TYP
MAX
—
—
—
—
—
—
—
—
—
—
60
82
87
±12
140
140
250
280
1.6
3.0
16
18
±40
±50
250
98
103
±13.1
750
800
1250
1350
8.0
12.0
80
100
±200
±240
—
—
—
—
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
V
CM
=
±10.5V
V
S
=
±10V
to
±18V
R
L
= 2k
LT1055
LT1056
LT1055
LT1056
●
●
●
●
●
●
●
●
●
●
●
●
●
●
MIN
—
—
—
—
—
—
—
—
—
—
80
85
89
±12
MAX
330
360
—
—
4.0
—
50
70
±150
±80
—
—
—
—
UNITS
µV
µV
µV
µV
µV/°C
µV/°C
pA
pA
pA
pA
V/mV
dB
dB
V
10556fc
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
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing
V
O
=
±10V,
R
L
= 2k
3
LT1055/LT1056
The
●
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
TYP
180
180
1.3
LT1055M
LT1056M
TYP
250
250
1.8
ELECTRICAL CHARACTERISTICS
CONDITIONS
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
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing
MIN
LT1055
LT1056
●
●
●
MAX
500
550
4.0
MIN
—
—
—
MAX
1200
1250
8.0
UNITS
µV
µV
µV/°C
—
—
—
(Note 6)
Warmed Up
T
A
= 125°C
Warmed Up
T
A
= 125°C
V
CM
=
±10.5V
LT1055
LT1056
LT1055
LT1056
●
●
●
●
●
●
●
●
—
—
—
—
40
85
88
±12
0.20
0.25
±0.4
±0.5
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
V
O
=
±10V,
R
L
= 2k
V
S
=
±10V
to
±17V
R
L
= 2k
T
A
= 25°C. V
S
=
±15V,
V
CM
= 0V unless otherwise noted.
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
LT1055CS8/LT1056CS8
MIN
TYP
MAX
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
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
10556fc
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
4
LT1055/LT1056
The
●
denotes the specifications which apply over the temperature range
0°C
≤
T
A
≤
70°C. V
S
=
±15V,
V
CM
= 0V, unless otherwise noted.
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
●
●
●
●
●
●
●
●
60
82
87
±12
LT1055CS8/LT1056CS8
MIN
TYP
MAX
800
4
18
±60
250
98
103
±13.1
2200
15
150
±400
UNITS
µV
µV/°C
pA
pA
V/mV
dB
dB
V
ELECTRICAL CHARACTERISTICS
For MIL-STD components, please refer to LTC883 data sheet for test
listing and parameters.
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:
Offset voltage is measured under two different conditions:
(a) approximately 0.5 seconds after application of power; (b) at T
A
= 25°C
only, with the chip heated to approximately 38°C for the LT1055 and to
45°C for the LT1056, to account for chip temperature rise when the device
is fully warmed up.
Note 3:
10Hz noise voltage density is sample tested on every lot of A
grades. Devices 100% tested at 10Hz are available on request.
Note 4:
This parameter is tested on a sample basis only.
Note 5:
Current noise is calculated from the formula: i
n
= (2ql
B
)
1/2
, where
q = 1.6 • 10
–19
coulomb. The noise of source resistors up to 1GΩ swamps
the contribution of current noise.
Note 6:
Offset voltage drift with temperature is practically unchanged
when the offset voltage is trimmed to zero with a 100k potentiometer
between the balance terminals and the wiper tied to V
+
. Devices tested to
tighter drift specifications are available on request.
10556fc
5
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