Linear Technology LT1125, LT1124 Datasheet

FEATURES

■

100% Tested Low Voltage Noise: 2.7nV/√Hz Typ

4.2nV/√Hz Max

■

Slew Rate: 4.5V/µs Typ

■

Gain Bandwidth Product: 12.5MHz Typ

■

Offset Voltage, Prime Grade: 70µV Max

Low Grade: 100µV Max

■

High Voltage Gain: 5 Million Min

■

Supply Current Per Amplifier: 2.75mA Max

■

Common Mode Rejection: 112dB Min

■

Power Supply Rejection: 116dB Min

■

Available in 8-Pin SO Package

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APPLICATIO S

■

Two and Three Op Amp Instrumentation Amplifiers

■

Low Noise Signal Processing

■

Active Filters

■

Microvolt Accuracy Threshold Detection

■

Strain Gauge Amplifiers

■

Direct Coupled Audio Gain Stages

■

Tape Head Preamplifiers

■

Infrared Detectors

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

Protected by U.S. patents 4,775,884 and 4,837,496.

LT1124/LT1125

Dual/Quad Low Noise,

High Speed Precision Op Amps

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DESCRIPTIO

The LT®1124 dual and LT1125 quad are high performance
op amps that offer higher gain, slew rate and bandwidth
than the industry standard OP-27 and competing OP-270/
OP-470 op amps. In addition, the LT1124/LT1125 have
lower IB and I
than the OP-270/OP-470.

In the design, processing and testing of the device, par­ticular attention has been paid to the optimization of the
entire distribution of several key parameters. Slew rate,
gain bandwidth and 1kHz noise are 100% tested for each
individual amplifier. Consequently, the specifications of
even the lowest cost grades (the LT1124C and the
LT1125C) have been spectacularly improved compared
to equivalent grades of competing amplifiers.

Power consumption of the LT1124 is one half of two
OP-27s. Low power and high performance in an 8-pin SO
package make the LT1124 a first choice for surface mounted
systems and where board space is restricted.

For a decompensated version of these devices, with three
times higher slew rate and bandwidth, please see the
LT1126/LT1127 data sheet.

than the OP-27; lower VOS and noise

OS

TYPICAL APPLICATIO

Instrumentation Amplifier with Shield Driver

3

INPUT

+

1/4

LT1125

2

–

GUARD

+

8

–

GUARD

13

–

1/4

LT1125

12

+

1/4

LT1125

1

10

+

9

–

14

U

R

F

3.4k

R

G

100Ω

R

G

100Ω

R

F

3.4k

1k

30k1k

15V

5

4

+

1/4

LT1125

6

–

11

–15V

GAIN

POWER BW

SMALL-SIGNAL BW

NOISE

V

7

OUTPUT

30k

= 30 (1 + RF/RG) ≈ 1000
= 170kHz
= 400kHz
= 3.8µV/ Hz AT OUTPUT

√

= 35µV

OS

1124/25 TA01

Input Offset Voltage Distribution

(All Packages, LT1124 and LT1125)

DUALS

VS = ±15V
T

= 25°C

A

30

20

PERCENT OF UNITS

10

0

–60 –20

–100

INPUT OFFSET VOLTAGE (µV)

758

QUADS

200

2316 UNITS

TESTED

60

1124/25 TA02

10020

1

LT1124/LT1125

1
2
3
4

8
7
6
5

TOP VIEW

OUT A

–IN A
+IN A

V

–

V

+

OUT B
–IN B
+IN B

N8 PACKAGE
8-LEAD PDIP

J8 PACKAGE

8-LEAD CERDIP

A

B

1
2
3
4
5
6
7

TOP VIEW

N PACKAGE

14-LEAD PDIP

J PACKAGE

14-LEAD CERDIP

14
13
12
11
10

9
8

OUT A

–IN A
+IN A

V

+

+IN B
–IN B

OUT B

OUT D
–IN D
+IN D
V

–

+IN C
–IN C
OUT C

B

A

C

D

A

W

O

LUTEXI TIS

S

A

WUW

U

(Note 1)

ARB

G

Supply Voltage ..................................................... ±22V

Input Voltages ......................... Equal to Supply Voltage

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

Differential Input Current (Note 6) ..................... ±25mA

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

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

/

PACKAGE

+IN A

–

V
+IN B
–IN B

T

NOTE: THIS PIN CONFIGURATION DIFFERS FROM THE
8-PIN PDIP CONFIGURATION. INSTEAD, IT FOLLOWS
THE INDUSTRY STANDARD LT1013DS8 SO PACKAGE
PIN LOCATIONS

O

RDER I FOR ATIO

TOP VIEW

1

2

A

3

B

4

S8 PACKAGE

8-LEAD PLASTIC SO

= 140°C, θJA = 190°C

JMAX

8

–IN A
OUT A

7

+

V

6

OUT B

5

WU

ORDER PART

NUMBER

LT1124CS8
LT1124AIS8
LT1124IS8

S8 PART MARKING

1124
1124AI
1124I

U

Operating Temperature Range

LT1124AC/LT1124C

LT1125AC/LT1125C (Note 10) .......... – 40°C to 85°C

LT1124AI/LT1124I ............................ –40°C to 85°C

LT1124AM/LT1124M

LT1125AM/LT1125M ...................... –55°C to 125°C

ORDER PART

NUMBER

LT1124CJ8
LT1124ACN8
LT1124CN8
LT1124AMJ8
LT1124MJ8

T

= 160°C, θJA = 100°C (J8)

JMAX

= 140°C, θJA = 130°C (N8)

T

JMAX

TOP VIEW

1

OUT A

2

–IN A
+IN A

+

V
+IN B
–IN B

OUT B

NC

LECTRICAL C CHARA TERIST

E

A

3
4
5

B

6
7
8

SW PACKAGE

16-LEAD PLASTIC (WIDE) SO

T

= 140°C, θJA = 130°C

JMAX

16

OUT D

15

D

C

–IN D

14

+IN D

–

13

V

12

+IN C

11

–IN C

10

OUT C

9

NC

LT1125CS

ICS

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

T

= 160°C, θJA = 80°C (J)

JMAX

T

= 140°C, θJA = 110°C (N)

JMAX

LT1125CJ
LT1125ACN
LT1125CN
LT1125AMJ
LT1125MJ

LT1124AC/AI/AM LT1124/C/I/M

LT1125AC/AM LT1125/C/M

SYMBOL PARAMETER CONDITIONS (Note 2) MIN TYP MAX MIN TYP MAX UNITS

V

OS

∆V

OS

∆Time Voltage Stability
I

OS

2

Input Offset Voltage LT1124 20 70 25 100 µV

LT1125 25 90 30 140 µV

Long Term Input Offset 0.3 0.3 µV/Mo

Input Offset Current LT1124 5 15 6 20 nA

LT1125 6 20 7 30 nA

LT1124/LT1125

LECTRICAL C CHARA TERIST

E

SYMBOL PARAMETER CONDITIONS (Note 2) MIN TYP MAX MIN TYP MAX UNITS

I

B

e

n

i

n

V

CM

CMRR Common Mode Rejection Ratio VCM = ±12V 112 126 106 124 dB
PSRR Power Supply Rejection Ratio VS = ±4V to ±18V 116 126 110 124 dB
A

VOL

V

OUT

SR Slew Rate RL ≥ 2k (Notes 3, 7) 3 4.5 2.7 4.5 V/µs
GBW Gain Bandwidth Product fO = 100kHz (Note 3) 9 12.5 8 12.5 MHz
Z

O

I

S

Input Bias Current ±7 ±20 ±8 ±30 nA
Input Noise Voltage 0.1Hz to 10Hz (Notes 8, 9) 70 200 70 nV
Input Noise Voltage Density fO = 10Hz (Note 4) 3.0 5.5 3.0 5.5 nV/√Hz

f

Input Noise Current Density fO = 10Hz 1.3 1.3 pA/√Hz

f

Input Voltage Range ±12 ±12.8 ±12 ±12.8 V

Large-Signal Voltage Gain RL ≥ 10k, V

R

Maximum Output Voltage Swing RL ≥ 2k ±13 ±13.8 ±12.5 ±13.8 V

Open-Loop Output Resistance V
Supply Current per Amplifier 2.3 2.75 2.3 2.75 mA
Channel Separation f ≤ 10Hz (Note 9) 134 150 130 150 dB

V

ICS

= 1000Hz (Note 3) 2.7 4.2 2.7 4.2 nV/√Hz

O

= 1000Hz 0.3 0.3 pA/√Hz

O

≥ 2k, V

L

= 0, I

OUT

= ±10V, RL = 2k

OUT

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

LT1124AC/AI/AM LT1124C/I/M

LT1125AC/AM LT1125C/M

= ±10V 5 17 3.0 15 V/µV

OUT

= ±10V 2 4 1.5 3 V/µV

OUT

= 0 75 75 Ω

OUT

P-P

The ● denotes the specifications which apply over the –55°C ≤ TA ≤ 125°C temperature range, VS = ±15V, unless otherwise noted.

LT1124AM LT1124M
LT1125AM LT1125M

SYMBOL PARAMETER CONDITIONS (Note 2) MIN TYP MAX MIN TYP MAX UNITS

V

OS

∆V

OS

∆Temp Voltage Drift
I

OS

I

B

V

CM

CMRR Common Mode Rejection Ratio VCM = ±11.3V ● 106 122 100 120 dB
PSRR Power Supply Rejection Ratio VS = ±4V to ±18V ● 110 122 104 120 dB
A

VOL

V

OUT

SR Slew Rate RL ≥ 2k (Notes 3, 7) ● 2.3 3.8 2 3.8 V/µs
I

S

Input Offset Voltage LT1124 ● 50 170 60 250 µV

LT1125

Average Input Offset (Note 5) ● 0.3 1.0 0.4 1.5 µV/°C

Input Offset Current LT1124 ● 18 45 20 60 nA

LT1125

Input Bias Current ● ±18 ±55 ±20 ±70 nA
Input Voltage Range ● ±11.3 ±12 ±11.3 ±12 V

Large-Signal Voltage Gain RL ≥ 10k, V

≥ 2k, V

R

L

Maximum Output Voltage Swing RL ≥ 2k ● ±12.5 ±13.6 ±12 ±13.6 V

Supply Current per Amplifier ● 2.5 3.25 2.5 3.25 mA

= ±10V ● 3 10 2.0 10 V/µV

OUT

= ±10V ● 1 3 0.7 2 V/µV

OUT

● 55 190 70 290 µV

● 18 55 20 70 nA

3

LT1124/LT1125

LECTRICAL C CHARA TERIST

E

ICS

The ● denotes the specifications which apply over the 0°C ≤ TA ≤ 70°C

temperature range, VS = ±15V, unless otherwise noted.

LT1124AC LT1124C

SYMBOL PARAMETER CONDITIONS (Note 2) MIN TYP MAX MIN TYP MAX UNITS

V

OS

∆V

OS

∆Temp Voltage Drift
I

OS

I

B

V

CM

CMRR Common Mode Rejection Ratio VCM = ±11.5V ● 109 125 102 122 dB
PSRR Power Supply Rejection Ratio VS = ±4V to ±18V ● 112 125 107 122 dB
A

VOL

V

OUT

SR Slew Rate RL ≥ 2k (Notes 3, 7) ● 2.6 4 2.4 4 V/µs
I

S

Input Offset Voltage LT1124 ● 35 120 45 170 µV

LT1125 ● 40 140 50 210 µV

Average Input Offset (Note 5) ● 0.3 1 0.4 1.5 µV/°C

Input Offset Current LT1124 ● 625 735 nA

LT1125 ● 735 845 nA

Input Bias Current ● ±8 ±35 ±9 ±45 nA
Input Voltage Range ● ±11.5 ±12.4 ±11.5 ±12.4 V

Large-Signal Voltage Gain RL ≥ 10k, V

Maximum Output Voltage Swing RL ≥ 2k ● ±12.5 ±13.7 ±12 ±13.7 V

Supply Current per Amplifier ● 2.4 3 2.4 3 mA

≥ 2k, V

R

L

= ±10V ● 4.0 15 2.5 14 V/µV

OUT

= ±10V ● 1.5 3.5 1.0 2.5 V/µV

OUT

LT1125AC LT1125C

The ● denotes the specifications which apply over the –40°C ≤ TA ≤ 85°C temperature range, VS = ±15V,
unless otherwise noted. (Note 10)

LT1124AC/AI LT1124C/I

SYMBOL PARAMETER CONDITIONS (Note 2) MIN TYP MAX MIN TYP MAX UNITS

V

OS

∆V

OS

∆Temp Voltage Drift
I

OS

I

B

V

CM

CMRR Common Mode Rejection Ratio VCM = ±11.4V ● 107 124 101 121 dB
PSRR Power Supply Rejection Ratio VS = ±4V to ±18V ● 111 124 106 121 dB
A

VOL

V

OUT

SR Slew Rate RL ≥ 2k (Notes 3, 7) ● 2.4 3.9 2.1 3.9 V/µs
I

S

Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.

Note 2: Typical parameters are defined as the 60% yield of parameter
distributions of individual amplifiers; i.e., out of 100 LT1125s (or 100
LT1124s) typically 240 op amps (or 120) will be better than the indicated
specification.

Note 3: This parameter is 100% tested for each individual amplifier.
Note 4: This parameter is sample tested only.
Note 5: This parameter is not 100% tested.
Note 6: The inputs are protected by back-to-back diodes. Current limiting

resistors are not used in order to achieve low noise. If differential input
voltage exceeds ±1.4V, the input current should be limited to 25mA.

Input Offset Voltage LT1124 ● 40 140 50 200 µV

LT1125 ● 45 160 55 240 µV

Average Input Offset (Note 5) ● 0.3 1 0.4 1.5 µV/°C

Input Offset Current LT1124 ● 15 40 17 55 nA

Input Bias Current ● ±15 ±50 ±17 ±65 nA
Input Voltage Range ● ±11.4 ±12.2 ±11.4 ±12.2 V

Large-Signal Voltage Gain RL ≥ 10k, V

Maximum Output Voltage Swing RL ≥ 2k ● ±12.5 ±13.6 ±12 ±13.6 V

Supply Current per Amplifier ● 2.4 3.25 2.4 3.25 mA

LT1125

≥ 2k, V

R

L

= ±10V ● 3.5 12 2.2 12 V/µV

OUT

= ±10V ● 1.2 3.2 0.8 2.3 V/µV

OUT

● 15 50 17 65 nA

Note 7: Slew rate is measured in AV = –1; input signal is ±7.5V, output
measured at ±2.5V.

Note 8: 0.1Hz to 10Hz noise can be inferred from the 10Hz noise voltage
density test. See the test circuit and frequency response curve for 0.1Hz to
10Hz tester in the Applications Information section of the LT1007 or
LT1028 data sheets.

Note 9: This parameter is guaranteed but not tested.
Note 10: The LT1124C/LT1125C and LT1124AC/LT1125AC are guaranteed

to meet specified performance from 0°C to 70°C and are designed,
characterized and expected to meet these extended temperature limits, but
are not tested at –40°C and 85°C. The LT1124AI and LT1124I are
guaranteed to meet the extended temperature limits.

LT1125AC LT1125C

4

LT1124/LT1125

FREQUENCY (Hz)

1

0

POWER SUPPLY REJECTION RATIO (dB)

20

40

120

140

160

10

2

10

8

1124/25 G09

10 10310410510610

7

60

100

80

–PSRR

+PSRR

TA = 25°C

UW

LPER

F

O

R

ATYPICA

0.1Hz to 10Hz Voltage Noise 0.01Hz to 1Hz Voltage Noise Voltage Noise vs Frequency

VOLTAGE NOISE (40nV/DIV)

0

26810

4

TIME (SECONDS)

1124/25 G01

Current Noise vs Frequency vs Temperature vs Time

10.0

√

3.0

1.0

0.3

RMS CURRENT NOISE DENSITY (pA/ Hz)

0.1
10 1k 10k

1/f CORNER
100Hz

100

FREQUENCY (Hz)

VS = ±15V

= 25°C

T

A

MAXIMUM

TYPICAL

1124 G04

CCHARA TERIST

E

C

VOLTAGE NOISE (40nV/DIV)

0

20 60 80 100

Input Bias or Offset Current Output Short-Circuit Current

30

20

10

INPUT BIAS OR OFFSET CURRENT (nA)

0

–75

–25 0 50 100

–50 25 75 125

TEMPERATURE (°C)

40

TIME (SECONDS)

LT1124M/LT1125M

LT1124AM/LT1125AM

ICS

VS = ±15V

1124/25 G02

1124/25 G05

100

√

30

10

3

VS = ±15V

1/f CORNER

2.3Hz

1.0
FREQUENCY (Hz)

1

234

RMS VOLTAGE NOISE DENSITY (nV/ Hz)

1

0.1 10 100 1000

50
40

30
20
10

0
–10
–20
–30

SHORT-CIRCUIT CURRENT (mA)

SINKING SOURCING

–40
–50

0

TIME FROM OUTPUT SHORT TO GND (MINUTES)

VS = ±15V

= 25°C

T

A

MAXIMUM

TYPICAL

1124/25 G03

25°C

–55°C

125°C

125°C
25°C

–55°C

LT1124 G06

Input Bias Current Over the Common Mode Rejection Ratio Power Supply Rejection Ratio
Common Mode Range vs Frequency vs Frequency

20

VS = ±15V

= 25°C

T

A

15

10

5

0

–5

–10

INPUT BIAS CURRENT (nA)

–15

–20

–10 5 15

–15

COMMON MODE INPUT VOLTAGE (V)

DEVICE WITH POSITIVE

INPUT CURRENT

DEVICE WITH NEGATIVE

INPUT CURRENT

–5 10

0

1124/25 G07

160

140

120

100

80

60

40

20

COMMON MODE REJECTION RATIO (dB)

0

1k 100k 1M 10M

10k

FREQUENCY (Hz)

TA = 25°C
V

S

V

CM

= ±15V

= ±10V

1124/25 G08

5