LT1124/LT1125
Dual/Quad Low Noise,
High Speed Precision Op Amps
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 I
B
and I
OS
than the OP-27; lower V
OS
and noise
than the OP-270/OP-470.
In the design, processing and testing of the device, par-
ticular 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.
FEATURES
s
s
s
s
s
s
s
s
s
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
APPLICATIO S
s
s
s
s
s
s
s
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.
TYPICAL APPLICATIO
3
Instrumentation Amplifier with Shield Driver
+
1/4
LT1125
1
1k
R
F
3.4k
5
30k
Input Offset Voltage Distribution
(All Packages, LT1124 and LT1125)
V
S
=
±
15V
T
A
= 25°C
758 DUALS
200 QUADS
2316 UNITS
TESTED
2
–
15V
30
GUARD
INPUT
+
–
GUARD
+
8
1/4
LT1125
10
OUTPUT
30k
6
R
G
100Ω
–
PERCENT OF UNITS
R
G
100Ω
+
4
1/4
LT1125
11
–15V
7
20
–
9
10
13
–
1/4
LT1125
14
R
F
3.4k
1k
GAIN = 30 (1 + R
F
/R
G
)
≈
1000
POWER BW = 170kHz
SMALL-SIGNAL BW = 400kHz
NOISE = 3.8µV/
√
Hz AT OUTPUT
V
OS
= 35µV
0
–100
12
+
1124/25 TA01
U
U
U
20
60
– 60
– 20
INPUT OFFSET VOLTAGE (µV)
100
1124/25 TA02
1
LT1124/LT1125
ABSOLUTE
AXI U
RATI GS
(Note 1)
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
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/ORDER I FOR ATIO
TOP VIEW
+IN A 1
V
–
2
+IN B 3
B
–IN B 4
5
OUT B
A
8
7
6
–IN A
OUT A
V
+
ORDER PART
NUMBER
LT1124CS8
LT1124AIS8
LT1124IS8
S8 PART MARKING
1124
1124AI
1124I
LT1125CS
OUT A
–IN A
+IN A
V
+
+IN B
–IN B
OUT B
1
2
3
4
5
6
7
OUT A 1
–IN A 2
+IN A 3
V
–
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 140°C,
θ
JA
= 190°C
NOTE: THIS PIN CONFIGURATION DIFFERS FROM THE
8-PIN PDIP CONFIGURATION. INSTEAD, IT FOLLOWS
THE INDUSTRY STANDARD LT1013DS8 SO PACKAGE
PIN LOCATIONS
TOP VIEW
OUT A
1
A
D
16 OUT D
15 –IN D
14 +IN D
13
B
C
V
–
–IN A 2
+IN A 3
V
+
4
+IN B 5
–IN B 6
OUT B 7
NC 8
12 +IN C
11 –IN C
10 OUT C
9
NC
SW PACKAGE
16-LEAD PLASTIC (WIDE) SO
T
JMAX
= 140°C,
θ
JA
= 130°C
ELECTRICAL CHARACTERISTICS
SYMBOL
V
OS
∆V
OS
∆Time
I
OS
PARAMETER
Input Offset Voltage
Long Term Input Offset
Voltage Stability
Input Offset Current
LT1124
LT1125
LT1124
LT1125
T
A
= 25°C, V
S
=
±15V,
unless otherwise noted.
LT1124AC/AI/AM
LT1125AC/AM
MIN
TYP
MAX
20
25
0.3
5
6
15
20
70
90
LT1124/C/I/M
LT1125/C/M
MIN
TYP
MAX
25
30
0.3
6
7
20
30
100
140
CONDITIONS (Note 2)
2
U
U
W
W W
U
W
TOP VIEW
8
A
B
4
5
7
6
V
+
OUT B
–IN B
+IN B
ORDER PART
NUMBER
LT1124CJ8
LT1124ACN8
LT1124CN8
LT1124AMJ8
LT1124MJ8
J8 PACKAGE
8-LEAD CERDIP
N8 PACKAGE
8-LEAD PDIP
T
JMAX
= 160°C,
θ
JA
= 100°C (J8)
T
JMAX
= 140°C,
θ
JA
= 130°C (N8)
TOP VIEW
14 OUT D
A
D
13 –IN D
12 +IN D
11 V
–
B
C
10 +IN C
9
8
–IN C
OUT C
LT1125CJ
LT1125ACN
LT1125CN
LT1125AMJ
LT1125MJ
J PACKAGE
N PACKAGE
14-LEAD CERDIP 14-LEAD PDIP
T
JMAX
= 160°C,
θ
JA
= 80°C (J)
T
JMAX
= 140°C,
θ
JA
= 110°C (N)
UNITS
µV
µV
µV/Mo
nA
nA
LT1124/LT1125
ELECTRICAL CHARACTERISTICS
SYMBOL
I
B
e
n
PARAMETER
Input Bias Current
Input Noise Voltage
Input Noise Voltage Density
i
n
V
CM
CMRR
PSRR
A
VOL
V
OUT
SR
GBW
Z
O
I
S
Input Noise Current Density
Input Voltage Range
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Maximum Output Voltage Swing
Slew Rate
Gain Bandwidth Product
Open-Loop Output Resistance
Supply Current per Amplifier
Channel Separation
f
≤
10Hz (Note 9)
V
OUT
=
±10V,
R
L
= 2k
134
V
CM
=
±12V
V
S
=
±4V
to
±18V
R
L
≥
10k, V
OUT
=
±10V
R
L
≥
2k, V
OUT
=
±10V
R
L
≥
2k
R
L
≥
2k (Notes 3, 7)
f
O
= 100kHz (Note 3)
V
OUT
= 0, I
OUT
= 0
0.1Hz to 10Hz (Notes 8, 9)
f
O
= 10Hz (Note 4)
f
O
= 1000Hz (Note 3)
f
O
= 10Hz
f
O
= 1000Hz
±12
112
116
5
2
±13
3
9
T
A
= 25°C, V
S
=
±15V,
unless otherwise noted.
LT1124AC/AI/AM
LT1125AC/AM
MIN
TYP
MAX
±7
70
3.0
2.7
1.3
0.3
±12.8
126
126
17
4
±13.8
4.5
12.5
75
2.3
150
2.75
130
±12
106
110
3.0
1.5
±12.5
2.7
8
±20
200
5.5
4.2
LT1124C/I/M
LT1125C/M
MIN
TYP
MAX
±8
70
3.0
2.7
1.3
0.3
±12.8
124
124
15
3
±13.8
4.5
12.5
75
2.3
150
2.75
5.5
4.2
±30
CONDITIONS (Note 2)
UNITS
nA
nV
P-P
nV/√Hz
nV/√Hz
pA/√Hz
pA/√Hz
V
dB
dB
V/µV
V/µV
V
V/µs
MHz
Ω
mA
dB
The
q
denotes the specifications which apply over the –55°C
≤
T
A
≤
125°C temperature range, V
S
=
±15V,
unless otherwise noted.
LT1124AM
LT1125AM
MIN
TYP
MAX
q
q
q
q
q
q
q
SYMBOL
V
OS
∆V
OS
∆Temp
I
OS
I
B
V
CM
CMRR
PSRR
A
VOL
V
OUT
SR
I
S
PARAMETER
Input Offset Voltage
Average Input Offset
Voltage Drift
Input Offset Current
Input Bias Current
Input Voltage Range
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Maximum Output Voltage Swing
Slew Rate
Supply Current per Amplifier
CONDITIONS (Note 2)
LT1124
LT1125
(Note 5)
LT1124
LT1125
LT1124M
LT1125M
MIN
TYP
MAX
60
70
0.4
20
20
±20
±11.3
100
104
2.0
0.7
±12
2
±12
120
120
10
2
±13.6
3.8
2.5
3.25
250
290
1.5
60
70
±70
UNITS
µV
µV
µV/°C
nA
nA
nA
V
dB
dB
V/µV
V/µV
V
V/µs
mA
50
55
0.3
18
18
±18
±11.3
106
110
3
1
±12.5
2.3
±12
122
122
10
3
±13.6
3.8
2.5
170
190
1.0
45
55
±55
V
CM
=
±11.3V
V
S
=
±4V
to
±18V
R
L
≥
10k, V
OUT
=
±10V
R
L
≥
2k, V
OUT
=
±10V
R
L
≥
2k
R
L
≥
2k (Notes 3, 7)
q
q
q
q
q
q
q
3.25
3
LT1124/LT1125
temperature range, V
S
=
±15V,
unless otherwise noted.
SYMBOL
V
OS
∆V
OS
∆Temp
I
OS
I
B
V
CM
CMRR
PSRR
A
VOL
V
OUT
SR
I
S
PARAMETER
Input Offset Voltage
Average Input Offset
Voltage Drift
Input Offset Current
Input Bias Current
Input Voltage Range
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Maximum Output Voltage Swing
Slew Rate
Supply Current per Amplifier
ELECTRICAL CHARACTERISTICS
The
q
denotes the specifications which apply over the 0°C
≤
T
A
≤
70°C
LT1124AC
LT1125AC
MIN
TYP
MAX
35
120
40
140
0.3
1
6
7
±8
±12.4
125
125
15
3.5
±13.7
4
2.4
25
35
±35
±11.5
102
107
2.5
1.0
±12
2.4
3
LT1124C
LT1125C
MIN
TYP
MAX
45
170
50
210
0.4
1.5
7
8
±9
±12.4
122
122
14
2.5
±13.7
4
2.4
35
45
±45
CONDITIONS (Note 2)
LT1124
LT1125
(Note 5)
LT1124
LT1125
q
q
q
q
q
q
q
UNITS
µV
µV
µV/°C
nA
nA
nA
V
dB
dB
V/µV
V/µV
V
V/µs
mA
V
CM
=
±11.5V
V
S
=
±4V
to
±18V
R
L
≥
10k, V
OUT
=
±10V
R
L
≥
2k, V
OUT
=
±10V
R
L
≥
2k
R
L
≥
2k (Notes 3, 7)
q
q
q
q
q
q
q
±11.5
109
112
4.0
1.5
±12.5
2.6
3
The
q
denotes the specifications which apply over the –40°C
≤
T
A
≤
85°C temperature range, V
S
=
±15V,
unless otherwise noted. (Note 10)
LT1124AC/AI
LT1125AC
MIN
TYP
MAX
40
140
45
160
0.3
1
15
15
±15
±12.2
124
124
12
3.2
±13.6
3.9
2.4
40
50
±50
±11.4
101
106
2.2
0.8
±12
2.1
3.25
LT1124C/I
LT1125C
MIN
TYP
50
55
0.4
17
17
±17
±12.2
121
121
12
2.3
±13.6
3.9
2.4
SYMBOL
V
OS
∆V
OS
∆Temp
I
OS
I
B
V
CM
CMRR
PSRR
A
VOL
V
OUT
SR
I
S
PARAMETER
Input Offset Voltage
Average Input Offset
Voltage Drift
Input Offset Current
Input Bias Current
Input Voltage Range
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Maximum Output Voltage Swing
Slew Rate
Supply Current per Amplifier
CONDITIONS (Note 2)
LT1124
LT1125
(Note 5)
LT1124
LT1125
q
q
q
q
q
q
q
MAX
200
240
1.5
55
65
±65
UNITS
µV
µV
µV/°C
nA
nA
nA
V
dB
dB
V/µV
V/µV
V
V/µs
mA
V
CM
=
±11.4V
V
S
=
±4V
to
±18V
R
L
≥
10k, V
OUT
=
±10V
R
L
≥
2k, V
OUT
=
±10V
R
L
≥
2k
R
L
≥
2k (Notes 3, 7)
q
q
q
q
q
q
q
±11.4
107
111
3.5
1.2
±12.5
2.4
3.25
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.
Note 7:
Slew rate is measured in A
V
= –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.
4
LT1124/LT1125
TYPICAL PERFOR A CE CHARACTERISTICS
0.1Hz to 10Hz Voltage Noise
0.01Hz to 1Hz Voltage Noise
100
RMS VOLTAGE NOISE DENSITY (nV/
√
Hz)
VOLTAGE NOISE (40nV/DIV)
VOLTAGE NOISE (40nV/DIV)
0
2
4
6
TIME (SECONDS)
Current Noise vs Frequency
10.0
RMS CURRENT NOISE DENSITY (pA/
√
Hz)
INPUT BIAS OR OFFSET CURRENT (nA)
SOURCING
V
S
=
±15V
T
A
= 25°C
SHORT-CIRCUIT CURRENT (mA)
3.0
1.0
MAXIMUM
0.3
1/f CORNER
100Hz
0.1
10
100
1k
FREQUENCY (Hz)
10k
1124 G04
SINKING
TYPICAL
Input Bias Current Over the
Common Mode Range
COMMON MODE REJECTION RATIO (dB)
V
S
=
±15V
T
A
= 25°C
15
20
160
140
120
100
80
60
40
20
0
POWER SUPPLY REJECTION RATIO (dB)
INPUT BIAS CURRENT (nA)
10
5
0
–5
– 10
–15
–20
–15
–10
–5
5
10
0
COMMON MODE INPUT VOLTAGE (V)
15
DEVICE WITH NEGATIVE
INPUT CURRENT
DEVICE WITH POSITIVE
INPUT CURRENT
U W
8
10
1124/25 G01
1124/25 G07
Voltage Noise vs Frequency
V
S
=
±15V
T
A
= 25°C
30
10
MAXIMUM
3
1/f CORNER
2.3Hz
1
0.1
1.0
TYPICAL
0
20
40
60
TIME (SECONDS)
80
100
10
100
FREQUENCY (Hz)
1000
1124/25 G03
1124/25 G02
Input Bias or Offset Current
vs Temperature
30
V
S
=
±15V
50
40
30
20
10
0
–10
–20
–30
–40
–50
Output Short-Circuit Current
vs Time
V
S
=
±15V
25°C
– 55°C
125°C
20
10
125°C
25°C
–55°C
1
0
2
3
4
TIME FROM OUTPUT SHORT TO GND (MINUTES)
LT1124 G06
LT1124M/LT1125M
LT1124AM/LT1125AM
0
–75 –50 –25 0
25 50 75
TEMPERATURE (°C)
100 125
1124/25 G05
Common Mode Rejection Ratio
vs Frequency
T
A
= 25°C
V
S
=
±15V
V
CM
=
±10V
160
140
120
100
80
Power Supply Rejection Ratio
vs Frequency
T
A
= 25°C
– PSRR
60
+PSRR
40
20
0
10
2
10
3
10
4
10
5
10
6
FREQUENCY (Hz)
10
7
10
8
1124/25 G09
1k
10k
100k
1M
FREQUENCY (Hz)
10M
1124/25 G08
1
10
5
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