LINEAR TECHNOLOGY LT1055, LT1056 User Manual

FEATURES

■

Guaranteed

Offset Voltage: 150µV Max

–55°C to 125°C: 500µV Max

■

Guaranteed

■

Guaranteed

Drift: 4µV/°C Max

Bias Current
70°C: 150pA Max
125°C: 2.5nA Max

■

Guaranteed

■

Available in 8-Pin PDIP and SO Packages

Slew Rate: 12V/µs Min

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APPLICATIO S

■

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

LT1055/LT1056

Precision, High Speed,

JFET Input Operational Amplifiers

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DESCRIPTIO

The LT®1055/LT1056 JFET input operational amplifiers
combine precision specifications with high speed perfor­mance.

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
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.

TYPICAL APPLICATIO

1Hz to 10kHz Voltage-to-Frequency Converter

4.7k
15V

10kHZ

TRIM

75k

0V TO 10V

INPUT

*1% FILM

5k

= 1N4148

2N3906

–15V

0.1µF

22k

3.3M

0.1µF

THE LOW OFFSET VOLTAGE OF LT1056
CONTRIBUTES ONLY 0.1Hz OF ERROR
WHILE ITS HIGH SLEW RATE PERMITS
10kHz OPERATION.

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3M

0.001 (POLYSTYRENE)

33pF

–

+

15V

7

LT1056

4

–15V

2

3

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.

Distribution of Input Offset Voltage

(H Package)

140

VS = ±15V

= 25°C

T

A

120

634 UNITS TESTED
FROM THREE RUNS

OUTPUT
1Hz TO 10kHz

LM329

0.005%
LINEARITY

LT1055/56 TA01

1.5k

6

100

80

60

NUMBER OF UNITS

40

20

0

–400

INPUT OFFSET VOLTAGE (µV)

–200

0

50% TO ±60µV

200

400

LT1055/56 TA02

10556fc

1

LT1055/LT1056

WW

W

ABSOLUTE MAXIMUM RATINGS

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(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

U

W

PACKAGE/ORDER INFORMATION

ORDER PART

NUMBER

LT1055CN8
LT1056CN8

BAL

1

–IN

2

+IN

3

–

V

4

N8 PACKAGE
8-LEAD PDIP

T

= 150°C, θJA = 130°C/ W

JMAX

TOP VIEW

N/C

8

+

V

7

OUT

6

BAL

5

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

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ORDER PART

NUMBER

LT1055S8
LT1056S8

S8 PART

MARKING

1

BAL

–IN

2

+IN

3

–

V

4

S8 PACKAGE

8-LEAD PLASTIC SO

T

= 150°C, θJA = 150°C/ W

JMAX

TOP VIEW

8

N/C

+

V

7

OUT

6

BAL

5

1055
1056

TOP VIEW

NC

BALANCE

–IN

+IN

8-LEAD TO-5 METAL CAN

T

= 150°C, θJA = 150°C/ W, θJC = 45°C/ W

JMAX

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.

1

2

3

H PACKAGE

8

4

V

ELECTRICAL CHARACTERISTICS

SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

V

OS

I

OS

Input Offset Voltage (Note 2) LT1055 H Package — 50 150 — 70 400 µV

Input Offset Current Fully Warmed Up — 2 10 — 2 20 pA

+

V

7

6

OUT

5

BALANCE

–

LT1055ACH
LT1055CH
LT1055AMH
LT1055MH

OBSOLETE PACKAGE

Consider the N8 Package for Alternate Source

TA = 25°C. VS = ± 15V, VCM = 0V unless otherwise noted.

LT1055AM/LT1056AM LT1055CH/LT1056CH
LT1055AC/LT1056AC LT1055CN8/LT1056CN8

LT1056 H Package — 50 180 — 70 450 µV
LT1055 N8 Package — — — — 120 700 µV
LT1056 N8 Package — — — — 140 800 µV

ORDER PART

NUMBER

LT1056ACH
LT1056CH
LT1056AMH
LT1056MH

LT1055M/LT1056M

10556fc

2

LT1055/LT1056

ELECTRICAL CHARACTERISTICS

TA = 25°C. VS = ± 15V, VCM = 0V unless otherwise noted.

LT1055M/LT1056M
LT1055AM/LT1056AM LT1055CH/LT1056CH
LT1055AC/LT1056AC LT1055CN8/LT1056CN8

SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

I

B

Input Bias Current Fully Warmed Up — ±10 ±50 — ±10 ±50 pA

= 10V — 30 130 — 30 150 pA

V

CM

Input Resistance:Differential — 10

Common Mode V

= –11V to 8V — 10

CM

V

= 8V to 11V — 10

CM

12
12
11

—— 1012— Ω
—— 1012— Ω
—— 1011— Ω

Input Capacitance — 4 — — 4 — pF

e

n

Input Noise Voltage 0.1Hz to 10Hz LT1055 — 1.8 — — 2.0 — µV

LT1056 — 2.5 — — 2.8 — µV

P-P
P-P

Input Noise Voltage Density f0 = 10Hz (Note 3) — 28 50 — 30 60 nV/√Hz

f

= 1kHz (Note 4) — 14 20 — 15 22 nV/√Hz

0

I

n

A

VOL

Input Noise Current Density f0 = 10Hz, 1kHz (Note 5) — 1.8 4 — 1.8 4 fA/√Hz

Large-Signal Voltage Gain V0 = ±10V RL = 2k 150 400 — 120 400 — V/mV

R

= 1k 130 300 — 100 300 — V/mV

L

Input Voltage Range ±11 ±12 — ±11 ±12 — V

CMRR Common Mode Rejection Ratio VCM = ±11V 86100—8398— dB

PSRR Power Supply Rejection Ratio VS = ±10V to ±18V 90 106 — 88 104 — dB

V

OUT

Output Voltage Swing RL = 2k ±12 ±13.2 — ±12 ±13.2 — V

SR Slew Rate LT1055 10 13 — 7.5 12 — V/µs

LT1056 12 16 — 9.0 14 — V/µs

GBW Gain Bandwidth Product f = 1MHz LT1055 — 5.0 — — 4.5 — MHz

LT1056 — 6.5 — — 5.5 — MHz

I

S

Supply Current LT1055 — 2.8 4.0 — 2.8 4.0 mA

LT1056 — 5.0 6.5 — 5.0 7.0 mA

Offset Voltage Adjustment Range R

= 100k — ±5—— ±5—mV

POT

The ● denotes the specifications which apply over the temperature range 0°C ≤ TA ≤ 70°C.
V

= ±15V, VCM = 0V unless otherwise noted.

S

LT1055AC LT1055CH/LT1056CH
LT1056AC LT1055CN8/LT1056CN8

SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

V

OS

Input Offset Voltage (Note 2) LT1055 H Package

LT1056 H Package
LT1055 N8 Package
LT1056 N8 Package

Average Temperature H Package (Note 6)
Coefficient of Input Offset N8 Package (Note 6)

●

— 100 330 — 140 750 µV

●

— 100 360 — 140 800 µV

●

— — — — 250 1250 µV

●

— — — — 280 1350 µV

●

— 1.2 4.0 — 1.6 8.0 µV/°C

●

— — — — 3.0 12.0 µV/°C

Voltage

I

OS

I

B

A

VOL

CMRR Common Mode Rejection Ratio VCM = ±10.5V

PSRR Power Supply Rejection Ratio VS = ±10V to ±18V

V

OUT

Input Offset Current Warmed Up LT1055

T

= 70°C LT1056

A

Input Bias Current Warmed Up LT1055

= 70°C LT1056

T

A

Large-Signal Voltage Gain VO = ±10V, RL = 2k

Output Voltage Swing RL = 2k

●

— 10 50 — 16 80 pA

●

— 14 70 — 18 100 pA

●

— ±30 ±150 — ±40 ±200 pA

●

— ±40 ±80 — ±50 ±240 pA

●

80 250 — 60 250 — V/mV

●

85100—8298— dB

●

89 105 — 87 103 — dB

●

±12 ±13.1 — ±12 ±13.1 — V

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3

LT1055/LT1056

ELECTRICAL CHARACTERISTICS

–55°C ≤ T

≤ 125°C. VS = ±15V, VCM = 0V, unless otherwise noted.

A

The ● denotes the specifications which apply over the temperature range

LT1055AM LT1055M
LT1056AM LT1056M

SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

V

OS

Input Offset Voltage (Note 2) LT1055

LT1056

Average Temperature (Note 6)

●

— 180 500 — 250 1200 µV

●

— 180 550 — 250 1250 µV

●

— 1.3 4.0 — 1.8 8.0 µV/°C
Coefficient of Input Offset
Voltage

I

OS

I

B

A

VOL

CMRR Common Mode Rejection Ratio VCM = ±10.5V

PSRR Power Supply Rejection Ratio VS = ±10V to ±17V

V

OUT

Input Offset Current Warmed Up LT1055

= 125°C LT1056

T

A

Input Bias Current Warmed Up LT1055

= 125°C LT1056

T

A

Large-Signal Voltage Gain VO = ±10V, RL = 2k

Output Voltage Swing RL = 2k

●

— 0.20 1.2 — 0.25 1.8 nA

●

— 0.25 1.5 — 0.30 2.4 nA

●

— ± 0.4 ±2.5 — ± 0.5 ±4.0 nA

●

— ± 0.5 ±3.0 — ± 0.6 ±5.0 nA

●

40 120 — 35 120 — V/mV

●

85100—8298— dB

●

88 104 — 86 102 — dB

●

±12 ± 12.9 — ± 12 ±12.9 — V

TA = 25°C. VS = ± 15V, VCM = 0V unless otherwise noted.

LT1055CS8/LT1056CS8

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

I

OS

I

B

e

n

i

n

A

VOL

CMRR Common Mode Rejection Ratio VCM = ±11V 83 98 dB

PSRR Power Supply Rejection Ratio VS = ±10V to ±18V 88 104 dB

V

OUT

SR Slew Rate LT1055 7.5 12 V/µs

GBW Gain Bandwidth Product f = 1MHz LT1055 4.5 MHz

I

S

Input Offset Voltage (Note 2) 500 1500 µV

Input Offset Current Fully Warmed Up 5 30 pA

Input Bias Current Fully Warmed Up ± 30 ±100 pA

V

= 10V 30 150 pA

CM

Input Resistance Differential 0.4 TΩ

Common Mode V

= –11V to 8V 0.4 TΩ

CM

= 8V to 11V 0.05 TΩ

V

CM

Input Capacitance 4pF

Input Noise Voltage 0.1Hz to 10Hz LT1055 2.5 µV

LT1056 3.5 µV

P-P
P-P

Input Noise Voltage Density fO = 10Hz (Note 4) 35 70 nV/√Hz

f

= 1kHz (Note 4) 15 22 nV/√Hz

O

Input Noise Current Density fO = 10Hz, 1kHz (Note 5) 2.5 10 fA/√Hz

Large-Signal Voltage Gain VO = ±10V RL = 2k 120 400 V/mV

= 1k 100 300 V/mV

R

L

Input Voltage Range ±11 ± 12 V

Output Voltage Swing RL = 2K ±12 ± 13.2 V

LT1056 9.0 14 V/µs

LT1056 5.5 MHz

Supply Current LT1055 2.8 4.0 mA

LT1056 5.0 7.0 mA

Offset Voltage Adjustment Range R

= 100k ±5mV

POT

10556fc

4

LT1055/LT1056

ELECTRICAL CHARACTERISTICS

0°C ≤ T

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

I

OS

I

B

A

CMRR Common Mode Rejection Ratio VCM = ±10.5V ● 82 98 dB

PSRR Power Supply Rejection Ratio VS = ±10V to ±18V ● 87 103 dB

V

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
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.

≤ 70°C. VS = ±15V, VCM = 0V, unless otherwise noted.

A

OS

VOL

OUT

Input Offset Voltage (Note 2) ● 800 2200 µV

Average Temperature Coefficient of Input Offset Voltage ● 415µV/°C

Input Offset Current Warmed Up, TA = 70°C ● 18 150 pA

Input Bias Current Warmed Up, TA = 70°C ● ± 60 ±400 pA

Large-Signal Voltage Gain VO = ±10V, RL = 2k ● 60 250 V/mV

Output Voltage Swing RL = 2K ● ±12 ± 13.1 V

The ● denotes the specifications which apply over the temperature range

LT1055CS8/LT1056CS8

Note 3: 10Hz noise voltage density is sample tested on every lot of A

grades. Devices 100% tested at 10Hz are available on request.

= 25°C

A

Note 4: This parameter is tested on a sample basis only.
Note 5: Current noise is calculated from the formula: i

q = 1.6 • 10
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
tighter drift specifications are available on request.

–19

coulomb. The noise of source resistors up to 1GΩ swamps

n

+

1/2

= (2qlB)

. Devices tested to

, where

10556fc

5