Linear Technology LT1008S8, LT1008MH, LT1008IN8, LT1008CN8, LT1008CJ8 Datasheet

FEATURES

LT1008

Picoamp Input Current,

Microvolt Offset,

Low Noise Op Amp

U

DESCRIPTIO

■

Guaranteed Bias Current

TA = 25°C: 100pA Max
TA = –55°C to 125°C: 600pA Max

■

Guaranteed Offset Voltage: 120µV Max

■

Guaranteed Drift: 1.5µV/°C Max

■

Low Noise, 0.1Hz to 10Hz: 0.5µV

■

Guaranteed Low Supply Current: 600µA Max

■

Guaranteed CMRR: 114dB Min

■

Guaranteed PSRR: 114dB Min

■

Guaranteed Voltage Gain with 5mA Load Current

P-P

U

APPLICATIO S

■

Precision Instrumentation

■

Charge Integrators

■

Wide Dynamic Range Logarithmic Amplifiers

■

Light Meters

■

Low Frequency Active Filters

■

Standard Cell Buffers

■

Thermocouple Amplifiers

The LT®1008 is a universal precision operational amplifier
that can be used in practically all precision applications.
The LT1008 combines for the first time, 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, and the
ability to deliver 5mA load current with high voltage gain
round out the LT1008’s superb precision specifications.

The all around excellence of the LT1008 eliminates the
necessity of the time consuming error analysis procedure
of precision system design in many applications; the
LT1008 can be stocked as the universal precision op amp.

The LT1008 is externally compensated with a single ca­pacitor for additional flexibility in shaping the frequency
response of the amplifier. It plugs into and upgrades all
standard LM108A/LM308A applications. For an internally
compensated version with even lower offset voltage but
otherwise similar performance see the LT1012.

, LTC and LT are registered trademarks of Linear Technology Corporation.

TYPICAL APPLICATIO

Input Amplifier for 4.5 Digit Voltmeter

1000pF

1

–

INPUT

1V

9M

900k

90k

10k

0.1V

10V

100V

1000V

100k

5%

FN507
ALLEN BRADLEY
DECADE VOLTAGE DIVIDER

2

3

8

LT1008

+

4

–15V

U

15V

7

6

9k*

1k*

*RATIO MATCH ±0.01%

THIS APPLICATION REQUIRES LOW
BIAS CURRENT AND OFFSET VOLTAGE,
LOW NOISE AND LOW DRIFT WITH
TIME AND TEMPERATURE

0.1V

1V

10V
100V
1000V

TO 1V FULL-SCALE
ANALOG-TO-DIGITAL
CONVERTER

1008 TA01

Input Bias Current vs Temperature

100

50

0

–50

INPUT BIAS CURRENT (pA)

–100

–150

–50

UNDERCANCELLED UNIT

OVERCANCELLED UNIT

25

0

–25

TEMPERATURE (°C)

50

75

100

125

1008 TA02

1

LT1008

1

2

3

4

8

7

6

5

TOP VIEW

COMP2
V

+

OUT
NC

COMP1

–IN
+IN

V

–

S8 PACKAGE

8-LEAD PLASTIC SO

WWWU

ABSOLUTE AXI U RATI GS

(Note 1)

Supply Voltage ...................................................... ±20V

Differential Input Current (Note 2) ..................... ±10mA

Input Voltage ........................................................ ±20V

Output Short-Circuit Duration......................... Indefinite

Storage Temperature Range ................. –65°C to 150°C

UU

W

PACKAGE/ORDER I FOR ATIO

TOP VIEW

COMP2

8

–

(CASE)

7

–
+

5

4

1

COMP1

2

–IN

+IN

3

V

H PACKAGE

8-LEAD TO-5 METAL CAN

T

= 150°C, θJA = 150°C/W, θJC = 45°C/W

JMAX

ORDER PART

NUMBER

+

V

6

OUT

NC

COMP1

1

–IN

2

+IN

3

–

V

4

N8 PACKAGE
8-LEAD PDIP

T

= 150°C, θJA = 130°C/W

JMAX

J8 PACKAGE 8-LEAD CERDIP

= 150°C, θJA = 100°C/W

T

JMAX

ORDER PART

NUMBER

Operating Temperature Range

LT1008M (OBSOLETE) ............... –55°C to 125°C

LT1008C................................................. 0°C to 70°C

LT1008I ............................................. –40°C to 85°C

Lead Temperature (Soldering, 10 sec)..................300°C

TOP VIEW

COMP2

8

+

V

7

OUT

6

NC

5

T

= 150°C, θJA = 190°C/W

JMAX

ORDER PART

NUMBER

ORDER PART

NUMBER

S8 PART

MARKING

LT1008MH
LT1008CH

OBSOLETE PACKAGES

Consider N8 or S8 Package for Alternate Source

Consult LTC Marketing for parts specified with wider operating temperature ranges.

ELECTRICAL CHARACTERISTICS

SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

V

I

OS

I

B

e

i

n

A

2

OS

n

VOL

Input Offset Voltage 30 120 30 120 µV

Long-Term Input Offset Voltage Stability 0.3 0.3 µV/Month
Input Offset Current 30 100 30 100 pA

Input Bias Current ±30 ±100 ±30 ±100 pA

Input Noise Voltage 0.1Hz to 10Hz 0.5 0.5 µV
Input Noise Voltage Density fO = 10Hz (Note 4) 17 30 17 30 nV√Hz

Input Noise Current Density fO = 10Hz 20 20 fA/√Hz
Large-Signal Voltage Gain V

LT1008MJ8
LT1008CJ8

LT1008CN8
LT1008IN8

LT1008S8

1008

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

LT1008M/I LT1008C

(Note 3) 40 180 40 180 µV

(Note 4) 40 150 40 150 pA

(Note 5) ±40 ±150 ±40 ±150 pA

= 1000Hz (Note 5) 14 22 14 22 nV/√Hz

f

O

= ±12V, RL ≥ 10k 200 2000 200 2000 V/mV

OUT

V

= ±10V, RL ≥ 2k 120 600 120 600 V/mV

OUT

P-P

LT1008

ELECTRICAL CHARACTERISTICS

SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

CMRR Common Mode Rejection Ratio VCM = ±13.5V 114 132 114 132 dB
PSRR Power Supply Rejection Ratio VS = ±2V to ±20V 114 132 114 132 dB

Input Voltage Range ±13.5 ±14 ±13.5 ±14 V

V

I

OUT

S

Output Voltage Swing RL = 10k ±13 ±14 ±13 ±14 V
Slew Rate CF = 30pF 0.1 0.2 0.1 0.2 V/µs
Supply Current (Note 3) 380 600 380 600 µA

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

LT1008M/I LT1008C

The ● indicates specifications which apply over the full operating temperature range of –55°C ≤ TA ≤ 125°C for the LT1008M, –40°C
≤ TA ≤ 85°C for the LT1008I and 0°C ≤ TA ≤ 70°C for the LT1008C. VS = ±15V, VCM = 0V, unless otherwise noted.

LT1008M/I LT1008C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

V

OS

I

OS

I

B

A

VOL

CMRR Common Mode Rejection Ratio VCM = ±13.5V ● 108 128 110 130 dB
PSRR Power Supply Rejection Ratio VS = ±2.5V to ±20V ● 108 126 110 128 dB

V

OUT

I

S

Input Offset Voltage ● 50 250 40 180 µV

(Note 3)

Average Temperature Coefficient of
Input Offset Voltage

Input Offset Current ● 60 250 40 180 pA

(Note 3)

Average Temperature Coefficient of
Input Offset Current

Input Bias Current ● ±80 ±600 ±40 ±180 pA

(Note 3)

Average Temperature Coefficient of
Input Bias Current

Large-Signal Voltage Gain V

Input Voltage Range ● ±13.5 ±13.5 V
Output Voltage Swing RL = 10k ● ±13 ±14 ±13 ±14 V
Supply Current ● 400 800 400 800 µA

= ±12V, RL ≥ 10k ● 100 1000 150 1500 V/mV

OUT

● 60 320 50 250 µV

● 0.2 1.5 0.2 1.5 µV/°C

● 80 350 50 250 pA

● 0.4 2.5 0.4 2.5 pA/°C

● ±150 ±800 ±50 ±250 pA

● 0.6 6 0.4 2.5 pA/°C

(LT1008S8 only) VS = ±15V, VCM = 0V, TA = 25°C, unless otherwise noted.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

I

OS

I

B

e

n

Input Offset Voltage 30 200 µV

(Note 3) 40 250 µV

Long-Term Input Offset Voltage Stability 0.3 µV/Month
Input Offset Current 100 280 pA

(Note 3) 120 380 pA

Input Bias Current ±100 ±300 pA

(Note 3) ±120 ±400 pA

Input Noise Voltage 0.1Hz to 10Hz 0.5 µV
Input Noise Voltage Density fO = 10Hz (Note 5) 17 30 nV/√Hz

= 1000Hz (Note 5) 14 22 nV/√Hz

f

O

P-P

3

LT1008

ELECTRICAL CHARACTERISTICS

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

i

n

A

VOL

CMRR Common Mode Rejection Ratio VCM = ±13.5V 110 132 dB
PSRR Power Supply Rejection Ratio VS = ±2V to ±20V 110 132 dB

V

OUT

I

S

Input Noise Current Density fO = 10Hz 20 fA/√Hz
Large-Signal Voltage Gain V

Input Voltage Range ±13.5 ±14 V
Output Voltage Swing RL = 10k ±13 ±14 V
Slew Rate CF = 30pF 0.1 0.2 V/µs
Supply Current (Note 3) 380 600 µA

(LT1008S8 only) VS = ±15V, VCM = 0V, TA = 25°C, unless otherwise noted.

= ±12V, RL ≥ 10k 200 2000 V/mV

OUT

= ±10V, RL ≥ 2k 120 600 V/mV

V

OUT

(LT1008S8 only) The ● indicates specifications which apply over the full operating temperature range of 0°C ≤ TA ≤ 70°C.
VS = ±15V, VCM = 0V, unless otherwise noted.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

I

OS

I

B

A

VOL

CMRR Common Mode Rejection Ratio VCM = ±13.5V ● 108 130 dB
PSRR Power Supply Rejection Ratio VS = ±2.5V to ±20V ● 108 128 dB

V

OUT

I

S

Input Offset Voltage ● 40 280 µV

(Note 3)

Average Temperature Coefficient of ● 0.2 1.8 µV/°C
Input Offset Voltage

Input Offset Current ● 120 380 pA

(Note 3)

Average Temperature Coefficient of ● 0.4 4 pA/°C
Input Offset Current

Input Bias Current ● ±120 ±420 pA

(Note 3)

Average Temperature Coefficient of ● 0.4 5 pA/°C
Input Bias Current

Large-Signal Voltage Gain V

Input Voltage Range ● ±13.5 V
Output Voltage Swing RL = 10k ● ±13 ±14 V
Supply Current ● 400 800 µA

= ±12V, RL ≥ 10k ● 150 1500 V/mV

OUT

● 50 340 µV

● 140 500 pA

● ±140 ±550 pA

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 current limiting
resistors are used.

4

Note 3: These specifications apply for ±2V ≤ V
(±2.5V ≤ V
–13.5V ≤ V

Note 4: 10Hz noise voltage density is sample tested on every lot. Devices
100% tested at 10Hz are available on request.

Note 5: This parameter is tested on a sample basis only.

≤ ±20V over the temperature range) and

S

≤ 13.5V (for VS = ±15V).

CM

≤ ±20V

S

LT1008

COMMON MODE INPUT VOLTAGE (V)

–15

–60

INPUT BIAS CURRENT (pA)

–40

–20

0

20

60

–10

–5 0 5

1008 G03

10 15

40

+

–

I

B

V

CM

DEVICE WITH POSITIVE INPUT CURRENT

DEVICE WITH NEGATIVE INPUT CURRENT

V

S

= ±15V

T

A

= 25°C

R

INCM

= 2 × 1012Ω

U

W

UU

FREQUE CY CO PE SATIO CIRCUITS

Standard Compensation Circuit Alternate* Frequency Compensation

–V

IN

+V

IN

R1 R2

–

2

R3

LT1008

3

+

1

C

**BANDWIDTH AND SLEW RATE
ARE PROPORTIONAL TO 1/C

6

V

8

**

F

OUT

R1C

O

C

≥

F

R1 + R2

C

= 30pF

O

1008 FCC01

R2

FOR > 200, NO EXTERNAL FREQUENCY COMPENSATION IS NECESSARY

R1

F

–V

IN

+V

IN

R1 R2

UW

TYPICAL PERFOR A CE CHARACTERISTICS

Offset Voltage Drift vs Source
Resistance (Balanced or
Unbalanced)

100

Offset Voltage vs Source
Resistance (Balanced or
Unbalanced)

10

VS = ±15V
T

= 25°C

A

*IMPROVES REJECTION OF POWER
SUPPLY NOISE BY A FACTOR OF 5

–

2

8

**

C

S

100pF

6

LT1008

3

+

**BANDWIDTH AND SLEW RATE ARE
PROPORTIONAL TO 1/C

V

OUT

1008 FCC02

S

Input Bias Current vs
Common Mode Range

10

MAXIMUM

1

TYPICAL

0.1
1k 10k

OFFSET VOLTAGE DRIFT WITH TEMPERATURE (µV/°C)

Warm-Up Drift

5

= ±15V

V

S

= 25°C

T

A

4

3

2

1

CHANGE IN OFFSET VOLTAGE (µV)

0

0

TIME AFTER POWER ON (MINUTES)

100k 1M 10M 100M

SOURCE RESISTANCE (Ω)

METAL CAN (H) PACKAGE

DUAL-IN-LINE PACKAGE

PLASTIC (N) OR CERDIP (J)

1

3

2

4

1008 G01

1008 G04

1

MAXIMUM

0.1

TYPICAL

INPUT OFFSET VOLTAGE (mV)

0.01
1k 10k

100k 1M 10M 100M

SOURCE RESISTANCE (Ω)

1008 G02

Offset Voltage Drift with
Long-Term Stability of Four
Representative Units

10

8
6
4
2

0
–2
–4
–6

CHANGE IN OFFSET VOLTAGE (µV)

–8

5

–10

1

0

TIME (MONTHS)

3

4

2

5

1008 G05

Temperature of Four
Representative Units

60

40

20

0

–20

OFFSET VOLTAGE (µV)

–40

–60

–50

–25 0

TEMPERATURE (°C)

50 100 125

25 75

1008 G06

5