LT1112IS8#TRPBF [Linear]
LT1112 - Dual Low Power Precision, Picoamp Input Op Amps; Package: SO; Pins: 8; Temperature Range: -40°C to 85°C;型号: | LT1112IS8#TRPBF |
厂家: | Linear |
描述: | LT1112 - Dual Low Power Precision, Picoamp Input Op Amps; Package: SO; Pins: 8; Temperature Range: -40°C to 85°C 放大器 光电二极管 |
文件: | 总16页 (文件大小:331K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LT1112/LT1114
Dual/Quad Low Power
Precision, Picoamp Input Op Amps
U
FEATURES
DESCRIPTIO
The LT®1112 dual and LT1114 quad op amps achieve a
new standard in combining low cost and outstanding
precision specifications.
■
Offset Voltage – Prime Grade: 60µV Max
Offset Voltage – Low Cost Grade
■
(Including Surface Mount Dual/Quad): 75µV Max
■
Offset Voltage Drift: 0.5µV/°C Max
The performance of the selected prime grades matches or
exceeds competitive devices. In the design of the LT1112/
LT1114 however, particular emphasis has been placed on
optimizing performance in the low cost plastic and SO
packages. For example, the 75µV maximum offset voltage
in these low cost packages is the lowest on any dual or
quad non-chopper op amp.
■
Input Bias Current: 250pA Max
■
0.1Hz to 10Hz Noise: 0.3µVP-P, 2.2pAP-P
■
Supply Current per Amplifier: 400µA Max
■
CMRR: 120dB Min
■
Voltage Gain: 1 Million Min
■
Guaranteed Specs with ±1.0V Supplies
■
Guaranteed Matching Specifications
The LT1112/LT1114 also provide a full set of matching
specifications, facilitating their use in such matching
dependent applications as two and three op amp instru-
mentation amplifiers.
■
SO-8 Package – Standard Pinout
■
LT1114 in Narrow Surface Mount Package
U
APPLICATIO S
Another set of specifications is furnished at ±1V supplies.
This, combined with the low 320µA supply current per
amplifier, allows the LT1112/LT1114 to be powered by
two nearly discharged AA cells.
■
Picoampere/Microvolt Instrumentation
■
Two and Three Op Amp Instrumentation Amplifers
■
Thermocouple and Bridge Amplifiers
■
Low Frequency Active Filters
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Protected by U.S. Patents 4,575,685; 4,775,884 and 4,837,496
■
Photo Current Amplifiers
■
Battery-Powered Systems
U
TYPICAL APPLICATIO
Distribution of Input Offset Voltage
(In All Packages)
Dual Output, Buffered Reference (On Single 3V Supply)
30
25
20
15
3V
TOTAL SUPPLY CURRENT = 700µA
V
= ±15V
= 25°C
S
A
2V REFERENCE: SOURCES 1.7mA, SINKS 5mA
T
R
X
15k
OPTIONAL R = 300Ω INCREASES SOURCE
X
CURRENT TO 5mA
0.765V REFERENCE: SOURCES 5mA,
SINKS 0.5mA
TEMPERATURE COEFFICIENT LIMITED
BY REFERENCE = 20ppm/°C
–
2
3
8
1
1/2 LT1112
+
2.000V
MINIMUM SUPPLY = 2.7V
75k
0.1%
10
5
LT1004-1.2
–
6
5
0
7
0.765V
1/2 LT1112
+
10
INPUT OFFSET VOLTAGE (µV)
50
70
–70 –50 –30 –10
30
4
LT1112/14 • TA02
46.4k
0.1%
LT1112/14 • TA01
111214fb
1
LT1112/LT1114
W W
U W
(Note 1)
ABSOLUTE AXI U RATI GS
Specified Temperature Range (Note 12)
LT1112AM/LT1112M
Supply Voltage ..................................................... ±20V
Differential Input Current (Note 2) ..................... ±10mA
Input Voltage (Equal to Supply Voltage) ............... ±20V
Output Short-Circuit Duration......................... Indefinite
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................ 300°C
Operating Temperature Range (Note 11)
LT1114AM/LT1114M (OBSOLETE)... –55°C to 125°C
LT1112AC/LT1112C/LT1112S8
LT1114AC/LT1114C/LT1114S .......... –40°C to 85°C
LT1112I/LT1114I .............................. –40°C to 85°C
LT1112MPS8 ................................... –55°C to 125°C
LT1112AM/LT1112M
LT1114AM/LT1114M (OBSOLETE)... –55°C to 125°C
LT1112AC/LT1112C/LT1112S8
LT1114AC/LT1114C/LT1114S .......... –40°C to 85°C
LT1112I/LT1114I .............................. –40°C to 85°C
LT1112MPS8 ................................... –55°C to 125°C
U W
U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
ORDER PART
NUMBER
ORDER PART
+
OUT A
–IN A
+IN A
1
2
3
4
8
7
6
5
V
NUMBER
TOP VIEW
OUT B
–IN B
+IN B
A
+
LT1112S8
OUT A
–IN A
+IN A
1
2
3
4
8
7
6
5
V
LT1112ACN8
LT1112CN8
LT1112IN8
B
LT1112IS8
–
OUT B
–IN B
+IN B
V
A
LT1112MPS8
N8 PACKAGE
8-LEAD PDIP
B
–
V
S8 PART MARKING
TJMAX = 150°C, θJA = 130°C/W
S8 PACKAGE
8-LEAD PLASTIC SO
J8 PACKAGE 8-LEAD CERDIP
JMAX = 160°C, θJA = 100°C/W
1112
LT1112AMJ8
LT1112MJ8
T
TJMAX = 150°C, θJA = 190°C/W
1112I
1112MP
OBSOLETE PACKAGE
Consider the N8 Package for Alternate Source
TOP VIEW
ORDER PART
NUMBER
ORDER PART
NUMBER
TOP VIEW
1
2
3
4
5
6
7
OUT D
–IN D
+IN D
14
13
12
11
10
9
OUT A
–IN A
+IN A
OUT A
–IN A
+IN A
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
OUT D
–IN D
+IN D
A
B
D
C
LT1114S
LT1114IS
LT1114ACN
LT1114CN
LT1114IN
A
B
D
C
–
+
V
V
+
–
+IN C
–IN C
OUT C
+IN B
–IN B
OUT B
V
V
+IN B
–IN B
OUT B
NC
+IN C
–IN C
OUT C
NC
8
N PACKAGE
14-LEAD PDIP
TJMAX = 150°C, θJA = 110°C/W
S PACKAGE
J PACKAGE 14-LEAD CERDIP
16-LEAD PLASTIC SO (NARROW)
LT1114AMJ
LT1114MJ
T
JMAX = 160°C, θJA = 80°C/W (J)
TJMAX = 150°C, θJA = 150°C/W
OBSOLETE PACKAGE
Consider the N Package for Alternate Source
Consult LTC Marketing for parts specified with wider operating temperature ranges.
111214fb
2
LT1112/LT1114
ELECTRICAL CHARACTERISTICS
VS = ±15V, VCM = 0V, TA = 25°C, unless otherwise noted.
LT1112M/C/I
LT1114M/C/I
LT1112AM/AC
LT1114AM/AC
SYMBOL PARAMETER
CONDITIONS (Note 3)
MIN
TYP MAX MIN
TYP MAX
UNITS
V
Input Offset Voltage
20
40
60
110
25
45
75
130
µV
µV
OS
V = ±1.0V
S
∆V
Long Term Input Offset
Voltage Stability
0.3
0.3
µV/Mo
OS
∆Time
I
Input Offset Current
50
180
±250
0.9
60
75
230
330
pA
pA
OS
B
LT1114S/LT1114IS
I
Input Bias Current
±70
0.3
± 80
±100 ±450
±280
pA
pA
LT1114S/LT1114IS
e
Input Noise Voltage
0.1Hz to 10Hz (Note 10)
0.3
0.9
µV
P-P
n
Input Noise Voltage Density
f = 10Hz (Note 10)
O
16
14
28
18
16
14
28
18
nV/√Hz
nV/√Hz
O
f = 1000Hz (Note 10)
i
Input Noise Current
0.1Hz to 10Hz
2.2
2.2
pA
P-P
n
Input Noise Current Density
f = 10Hz
f = 1000Hz
O
0.030
0.008
0.030
0.008
pA/√Hz
pA/√Hz
O
V
Input Voltage Range
± 13.5 ± 14.3
± 13.5 ± 14.3
V
dB
dB
V
CM
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Minimum Supply Voltage
V
= ±13.5V
120
116
136
126
115
114
136
126
CM
V = ±1.0V to ±20V
S
(Note 5)
± 1.0
± 1.0
R
IN
Input Resistance
Differential Mode
Common Mode
(Note 4)
20
50
800
15
40
700
MΩ
GΩ
A
V
Large-Signal Voltage Gain
V = ±12V, R = 10kΩ
1000
800
5000
1500
800
600
5000
1300
V/mV
V/mV
VOL
OUT
O
L
V = ±10V, R = 2kΩ
O
L
Output Voltage Swing
R = 10kΩ
± 13.0 ± 14.0
± 11.0 ± 12.4
± 13.0 ± 14.0
± 11.0 ± 12.4
V
V
L
R = 2kΩ
L
SR
Slew Rate
0.16
450
0.30
750
0.16
450
0.30
750
V/µs
GBW
Gain-Bandwidth Product
Supply Current per Amplifier
f
= 10kHz
kHz
O
I
350
320
400
370
350
320
450
420
µA
µA
S
V = ±1.0V
S
Channel Separation
Offset Voltage Match
f = 10Hz
150
35
150
40
dB
O
∆V
(Note 6)
100
450
130
µV
OS
+
∆I
Noninverting Bias Current Match
(Notes 6, 7)
100
100
120
500
680
pA
pA
B
LT1114S/LT1114IS
(Notes 6, 8)
∆CMRR
∆PSRR
Common Mode Rejection Match
Power Supply Rejection Match
117
114
136
130
113
112
136
130
dB
dB
(Notes 6, 8)
111214fb
3
LT1112/LT1114
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range of –55°C ≤ TA ≤ 125°C, otherwise specifications are at TA = 25°C. VS = ±15V, unless otherwise noted.
LT1112MJ8/MPS8
LT1114MJ
LT1112AMJ8
LT1114AMJ
SYMBOL PARAMETER
Input Offset Voltage
CONDITIONS (Note 3)
MIN
TYP MAX MIN
TYP MAX
UNITS
V
●
●
●
35
120
45
45
70
150
160
260
µV
µV
µV
OS
LT1112MPS8
V = ±1.2V
60
220
0.5
S
∆V
Average Input Offset Voltage Drift (Note 9)
LT1112MPS8
●
●
0.15
0.20
0.4
0.75
1.3
µV/°C
µV/°C
OS
∆Temp
I
I
Input Offset Current
●
●
●
●
●
80
400
100
500
pA
pA
V
OS
B
Input Bias Current
±150 ±600
± 13.5 ± 14.1
±170 ±700
± 13.5 ± 14.1
V
Input Voltage Range
CM
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
V
= ±13.5V
116
112
130
124
111
110
130
124
dB
dB
CM
V = ±1.2V to ±20V
S
A
V = ±12V, R = 10kΩ
V = ±10V, R = 2kΩ
●
●
500
200
2500
600
400
170
2500
500
V/mV
V/mV
VOL
O
O
L
L
V
Output Voltage Swing
Slew Rate
R = 10kΩ
●
●
●
± 13.0 ± 13.85
± 13.0 ± 13.85
V
V/µs
µA
OUT
L
SR
0.12
0.22
380
55
0.12
0.22
380
I
Supply Current per Amplifier
Offset Voltage Match (Note 6)
460
200
530
S
∆V
●
●
70
70
240
270
µV
µV
OS
LT1112MPS8
Offset Voltage Match Drift
(Notes 6, 9)
●
●
0.2
0.7
0.3
0.5
1.0
1.9
µV/°C
µV/°C
LT1112MPS8
(Notes 6, 7)
(Notes 6, 8)
(Notes 6, 8)
+
∆I
Noninverting Bias Current Match
Common Mode Rejection Ratio
Power Supply Rejection Ratio
●
●
●
150
130
126
750
170
130
126
850
pA
dB
dB
B
∆CMRR
∆PSRR
112
109
106
106
The ● denotes the specifications which apply over the full operating temperature range of 0°C ≤ TA ≤ 70°C, otherwise specifications
are at TA = 25°C. VS = ±15V, unless otherwise noted.
LT1112ACN8
LT1114ACN
LT1112CN8/S8/IS8
LT1114CN/S/IS
SYMBOL PARAMETER
Input Offset Voltage
CONDITIONS (Note 3)
MIN
TYP MAX MIN
TYP MAX
UNITS
V
LT1112CN8
●
●
●
27
35
50
100
125
175
30
45
65
125
150
210
µV
µV
µV
OS
LT1112S8, LT1114CN/S
V = ±1.2V
S
∆V
Average Input Offset Voltage Drift LT1112CN8
●
●
0.15
0.3
0.5
1.1
0.2
0.4
0.75
1.3
µV/°C
µV/°C
OS
∆Temp
(Note 9)
LT1112S8, LT1114CN/S
I
Input Offset Current
●
●
60
220
70
90
290
420
pA
pA
OS
B
LT1114S
LT1114S
I
Input Bias Current
●
●
±80
±300
±90
±115 ±550
±350
pA
pA
V
Input Voltage Range
●
●
●
±13.5 ±14.2
±13.5 ± 14.2
V
dB
dB
CM
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
V
= ± 13.5V
118
114
133
125
113
112
133
125
CM
V = ±1.2V to ± 20V
S
A
VOL
V = ±12V, R = 10kΩ
●
●
800
500
4000
1300
650
400
4000
1000
V/mV
V/mV
O
L
L
V = ±10V, R = 2kΩ
O
V
Output Voltage Swing
Slew Rate
R = 10kΩ
L
●
●
±13.0 ±13.9
0.14 0.27
±13.0 ±13.9
0.14 0.27
V
OUT
SR
V/µs
111214fb
4
LT1112/LT1114
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range of 0°C ≤ TA ≤ 70°C, otherwise specifications are at TA = 25°C. VS = ±15V, unless otherwise noted.
LT1112ACN8
LT1114ACN
LT1112CN8/S8/IS8
LT1114CN/S/IS
SYMBOL PARAMETER
CONDITIONS (Note 3)
MIN
TYP MAX MIN
TYP MAX
UNITS
I
Supply Current per Amplifier
●
370
440
370
500
µA
S
∆V
Offset Voltage Match
(Note 6)
LT1112CN8
LT1112S8, LT1114CN/S
●
●
45
55
170
220
55
70
210
270
µV
µV
OS
Offset Voltage Match Drift
(Notes 6, 9)
LT1112N8
●
●
0.2
0.4
0.7
1.6
0.3
0.5
1.0
1.9
µV/°C
µV/°C
LT1112S8, LT1114CN/S
+
∆I
Noninverting Bias Current Match
(Notes 6, 7)
●
●
120
530
135
160
620
880
pA
pA
B
LT1114S
∆CMRR
∆PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
(Notes 6, 8)
(Notes 6, 8)
●
●
114
110
134
128
109
108
134
128
dB
dB
The ● denotes the specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 85°C, otherwise specifications
are at TA = 25°C. VS = ±15V, unless otherwise noted. (Note 12)
LT1112ACN8
LT1114ACN
LT1112CN8/IN8/S8/IS8
LT1114CN/S/IS
SYMBOL PARAMETER
Input Offset Voltage
CONDITIONS (Note 3)
MIN
TYP MAX MIN
TYP MAX
UNITS
V
LT1112CN8/IN8
●
●
●
30
40
55
110
135
200
35
45
60
135
160
240
µV
µV
µV
OS
LT1112S8/IS8, LT1114CN/S/IS
V = ±1.2V
S
∆V
Average Input Offset Voltage Drift LT1112CN8/IN8
LT1112S8/IS8, LT1114CN/S/IS
●
●
0.15
0.30
0.50
1.10
0.20
0.40
0.75
1.30
µV/°C
µV/°C
OS
∆Temp
I
I
Input Offset Current
●
●
70
330
85
400
600
pA
pA
OS
B
LT1114S/IS
LT1114S/IS
110
Input Bias Current
●
●
±110 ±500
± 13.5 ± 14.1
±120 ±550
±150 ±800
± 13.5 ± 14.1
pA
pA
V
Input Voltage Range
●
●
●
V
dB
dB
CM
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
V
= ±13.5V
117
113
132
125
112
111
132
125
CM
V = ±1.2V to ± 20V
S
A
V = ±12V, R = 10kΩ
●
●
700
400
3300
1100
600
300
3300
900
V/mV
V/mV
VOL
O
L
L
V = ±10V, R = 2kΩ
O
V
Output Voltage Swing
Slew Rate
R = 10kΩ
L
●
●
●
± 13.0 ± 13.85
± 13.0 ± 13.85
V
V/µs
µA
OUT
SR
0.13
0.24
370
0.13
0.24
370
I
Supply Current per Amplifier
450
510
S
∆V
OS
Offset Voltage Match
(Note 6)
LT1112CN8/IN8
LT1112S8/IS8, LT1114CN/S/IS
●
●
50
60
180
230
60
70
225
270
µV
µV
Offset Voltage Match Drift
(Notes 6)
LT1112CN8/IN8
●
●
0.2
0.4
0.7
1.6
0.3
0.5
1.0
1.9
µV/°C
µV/°C
LT1112S8/IS8, LT1114CN/S/IS
+
∆I
Noninverting Bias Current Match
(Notes 6, 7)
●
●
140
660
155
190
770
1300
pA
pA
B
LT1114S/IS
(Notes 6, 8)
(Notes 6, 8)
∆CMRR
∆PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
●
●
113
110
133
127
109
107
133
127
dB
dB
Note 3: Typical parameters are defined as the 60% yield of parameter
distributions of individual amplifiers; i.e., out of 100 LT1114s (or 100
LT1112s) typically 240 op amps (or 120) will be better than the indicated
specification.
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: Differential input voltages greater than 1V will cause excessive
current to flow through the input protection diodes unless limiting
resistance is used.
Note 4: This parameter is guaranteed by design and is not tested.
111214fb
5
LT1112/LT1114
ELECTRICAL CHARACTERISTICS
Note 5: Offset voltage, supply current and power supply rejection ratio are
Note 10: These parameters are not tested. More than 99% of the op amps
tested during product characterization have passed the maximum limits.
100% passed at 1kHz.
Note 11: The LT1112AC/LT1112C/LT1112S8/LT1112I and LT1114AC/
LT1114C/LT1114S/LT1114I are guaranteed functional over the
temperature range of –40°C to 85°C.
Note 12: The LT1112AC/LT1112C/LT1112S8/LT1114AC/LT1114C/
LT1114S are guaranteed to meet specified performance from 0°C to 70°C
and are designed, characterized and expected to meet specified
performance from –40°C to 85°C, but are not tested or QA sampled at
these temperatures. The LT1112I/LT1114I are guaranteed to meet
specified performance from –40°C to 85°C.
measured at the minimum supply voltage.
Note 6: Matching parameters are the difference between amplifiers A and
D and between B and C on the LT1114; between the two amplifiers on the
LT1112.
Note 7: This parameter is the difference between two noninverting input
bias currents.
Note 8: ∆CMRR and ∆PSRR are defined as follows: (1) CMRR and PSRR
are measured in µV/V on the individual amplifiers. (2) The difference is
calculated between the matching sides in µV/V. (3) The result is converted
to dB.
Note 9: This parameter is not 100% tested.
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Input Bias and Offset Current,
Noninverting Bias Current Match
vs Temperature
Input Bias Current Over
Common Mode Range
Distribution of Input Bias Current
(In All Packages Except LT1114S)
30
20
10
0
150
100
50
200
100
0
V
T
= ±15V
= 25°C
V
T
= ±15V
= 25°C
INCM
S
A
S
A
R
+
= 800GΩ
∆I
B
I
OS
DEVICE WITH POSITIVE INPUT CURRENT
DEVICE WITH NEGATIVE INPUT CURRENT
I
(UNDERCANCELLED)
B
0
–50
–100
–150
–
I
B
(OVERCANCELLED)
–100
I
B
+
V
CM
V
S
= ±15V
–200
–300
–100
0
100
200
300
–75 –50 –25
0
25 50 75 100 125
–15
–5
0
5
10
15
–200
–10
TEMPERATURE (°C)
INPUT BIAS CURRENT (pA)
COMMON MODE INPUT VOLTAGE (V)
LT1112/14 • TPC03
LT1112/14 • TPC01
LT1112/14 • TPC02
Drift with Temperature
LT1112N8/J8, LT1114J
Drift with Temperature
LT1112S8, LT1114N/S
Distribution of Offset Voltage at
VS = ±1.0V (In All Packages)
25
20
15
10
5
30
25
20
15
10
5
960 OP AMPS TESTED
240 LT1112S8
80 LT1114N
V = ±15V
S
850 OP AMPS TESTED
100 LT1112J8
165 LT1112N8
80 LT1114J
V
= ±15V
T = 25°C
A
S
40 LT1114S
20
15
10
5
0
0
0
–1.4
–0.6 –0.2 0.2
0.6 1.0 1.4
–80 –60 –40 –20
0
20 40 60 80 100
–1.0
0
0.2
–0.8 –0.6 –0.4 –0.2
0.4 0.6 0.8
OFFSET VOLTAGE DRIFT WITH TEMPERATURE (µV/°C)
INPUT OFFSET VOLTAGE (µV)
OFFSET VOLTAGE DRIFT WITH TEMPERATURE (µV/°C)
LT1112/14 • TPC05
LT1112/14 • TPC06
LT1112/14 • TPC04
111214fb
6
LT1112/LT1114
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Distribution of Offset Voltage
Distribution of Offset Voltage
Match Drift (LT1112S8, LT1114N,
LT1114S Packages)
Distribution of Offset
Voltage Match
Match Drift (LT1112J8, LT1112N8,
LT1114J Packages)
20
15
10
5
30
25
20
15
10
5
25
20
15
V
T
= ±15V
= 25°C
V
= ±15V
V = ±15V
S
364 PAIRS TESTED
S
A
S
342 PAIRS TESTED
10
5
0
0
0
0.4 0.6
OFFSET VOLTAGE MATCH DRIFT (µV/°C)
–0.8 –0.6 –0.4 –0.2
0
0.2
0.8
–1.6 –1.2 –0.8 –0.4
0
0.4 0.8 1.2 1.6
–100–80 –60 –40 –20
0
20 40 60 80 100
OFFSET VOLTAGE MATCH DRIFT (µV/°C)
∆V , OFFSET VOLTAGE MATCH (µV)
OS
LT1112/14 • TPC08
LT1112/14 • TPC09
LT1112/14 • TPC07
Noise Spectrum
0.1Hz to 10Hz Noise
0.01Hz to 1Hz Noise
1000
100
10
V
T
= ±1V TO ±20V
= 25°C
V
T
= ±15V
= 25°C
V
T
= ±15V
= 25°C
S
A
S
A
S
A
CURRENT NOISE
VOLTAGE NOISE
1/f
CORNER
2.5Hz
1/f
CORNER
140Hz
1
1
10
100
1000
2
6
20
0
4
8
10
0
40
60
TIME (SEC)
80
100
FREQUENCY (Hz)
TIME (SEC)
LT1112/14 • TPC10
LT1112/14 • TPC11
LT1112/14 • TPC12
Supply Current per Amplifier
vs Supply Voltage
Long Term Stability of Three
Representative Units
Warm-Up Drift
3
2
1
0
6
4
600
500
400
300
200
V
T
= ±15V
= 25°C
V
T
= ±15V
= 25°C
S
A
S
A
2A
3A
2
2B
1A
3B
LT1112S8, LT1114N/S PACKAGES
0
T
= 125°C
A
LT1114J PACKAGE
–2
–4
–6
T
= 25°C
A
1B
LT1112J8, N8 PACKAGES
T
A
= –55°C
0
0.5
1.0
1.5
2.0
2.5
0
2
3
4
5
6
1
±10
±15
0
±20
±5
TIME AFTER POWER ON (MINUTES)
TIME (MONTHS)
SUPPLY VOLTAGE (V)
LT1112/14 • TPC13
LT1112/14 • TPC14
LT1112/14 • TPC15
111214fb
7
LT1112/LT1114
TYPICAL PERFOR A CE CHARACTERISTICS
U W
Common Mode Range and
Voltage Swing with Respect to
Supply Voltages
Minimum Supply Voltage vs Temp
Voltage Gain at Minimum Supply
Voltage
Output Voltage Swing
vs Load Current
+
+
V
±1.2
±1.1
±1.0
±0.9
V
V
L
= ±1V TO ±20V
S
+
+
+
+
+
–
–
–
–
V
V
V
V
V
V
V
V
V
– 0.2
– 0.4
– 0.6
– 0.8
– 1.0
+ 0.8
+ 0.6
+ 0.4
+ 0.2
I
< 100µA
+
+
V
V
– 1
– 2
V
T
= ±1V TO ± 20V
= 25°C
S
A
SWING
MAX I AT ±1V = 1.3mA
L
AT ±1.5V = 3mA
+
–
–
CM RANGE
V
V
V
– 3
+ 3
+ 2
100
80
SWING
60
CM RANGE
40
–
V
+ 1
–
–
V
V
–75
–25
25
75
125
–50
0
25
50
75 100 125
3
9
–25
–9
–6
SINK
–3
0
6
SOURCE
TEMPERATURE (°C)
TEMPERATURE (°C)
OUTPUT CURRENT (mA)
LT1112/14 • TPC17
LT1112/14 • TPC16
LT1112/14 • TPC18
Voltage Gain
Voltage Gain vs Frequency
Gain, Phase Shift vs Frequency
–15
–10
–5
0
40
30
100
120
140
160
180
200
140
120
100
80
V
= ±15V
= 25°C
V = ±15V
S
T = 25°C
A
S
A
V
T
= ±15V
= 25°C
S
A
T
PHASE
20
R
= 10k
L
GAIN
60
10
R
= 2k
L
40
5
20
0
10
PHASE MARGIN = 70°C
0
–10
15
–20
0.01 0.1
–15
–5
0
5
10
15
0.01
0.1
1
10
–10
100 1k
10k 100k 1M 10M
1
10
OUTPUT VOLTAGE (V)
FREQUENCY (MHz)
FREQUENCY (Hz)
LT1112/14 • TPC21
LT1112/14 • TPC19
LT1112/14 • TPC20
Common Mode Rejection
vs Frequency
Power Supply Rejection
vs Frequency
Channel Separation vs Frequency
160
140
140
120
100
80
V
= ±15V
= 25°C
V
T
= ±15V
= 25°C
S
A
V
T
= ±15V
= 25°C
S
A
S
A
T
120
100
80
NEGATIVE
SUPPLY
140
120
100
80
POSITIVE
SUPPLY
60
60
40
20
40
AMP 1 IN UNITY-GAIN
20V , R = 2k
P-P
L
AMP 2 IN GAIN = 1000
= 100Ω, R = 100k
20
R
S
F
0
1k
FREQUENCY (Hz)
100k 1M
1
10
100
1k
1M
0.1
1
10 100
10k
10k 100k
10k
FREQUENCY (Hz)
1M
1
10
100
1k
100k
FREQUENCY (Hz)
LT1112/14 • TPC23
LT1112/14 • TPC24
LT1112/14 • TPC22
111214fb
8
LT1112/LT1114
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Slew Rate, Gain-Bandwidth
Product and Phase Margin
vs Temperature
Capacitive Loading Handling
Closed-Loop Output Impedance
0.4
0.3
1000
100
10
120
100
80
60
40
20
0
V
T
= ±15V
= 25°C
V
T
= ±15V
= 25°C
S
A
S
A
SLEW
80
70
60
0.2
A
= 100
A = +1
V
V
φm
1
A
= +1
800
700
600
V
0.1
GBW
A
V
= 10
0.01
0.001
–50
0
25
50
75 100 125
1
10
100
1k
10k
100k 1M
–25
0.001 0.01
CAPACITIVE LOAD (µF)
0.1
1
10
0.00001 0.0001
FREQUENCY (Hz)
TEMPERATURE (°C)
LT1112/14 • TPC25
LT1112/14 • TPC26
LT1112/14 • TPC27
Undistorted Output Voltage
vs Frequency
Small-Signal Transient Response
Large-Signal Transient Response
28
24
20
16
12
8
T
= 25°C
= 10k
A
L
R
V
= ±15V
S
V
= ±5V
S
4
2µs/DIV
50µs/DIV
0
A
V = +1
F = 10k
AV = +1
1
10
100
1000
R
C
L = 500pF
FREQUENCY (kHz)
CF = 100pF
VS = ±15V
VS = ±15V
LT1112/14 • TPC30
111214fb
9
LT1112/LT1114
W U U
U
APPLICATIO S I FOR ATIO
The LT1112 dual and LT1114 quad in the plastic and
ceramic DIP packages are pin compatible to and directly
replace such precision op amps as the OP-200, OP-297,
AD706 duals and OP-400, OP-497, AD704 quads with
improved price/performance.
output clips cleanly, without any glitches or phase rever-
sal. The OP-297 exhibits phase reversal. The photos also
illustrate that both the input and output ranges of the
LT1112 are within 800mV of the supplies. The effect of
inputandoutputoverdriveontheotheramplifiersinthe
LT1112 or LT1114 packages is negligible, as each
amplifier is biased independently.
The LT1112 in the S8 surface mount package has the
standard pin configuration, i.e., the same configuration as
the plastic and ceramic DIP packages.
Advantages of Matched Dual and Quad Op Amps
The LT1114 quad is offered in the narrow 16-pin surface
mount package. All competitors are in the wide 16-pin
package which occupies 1.8 times the area of the narrow
package. The wide package is also 1.8 times thicker than
the narrow package.
In many applications the performance of a system de-
pendsonthematchingbetweentwooperationalamplifiers
rather than the individual characteristics of the two op
amps. Two or three op amp instrumentation amplifiers,
tracking voltage references and low drift active filters are
some of the circuits requiring matching between two op
amps.
TheinputsoftheLT1112/1114areprotectedwithback-to-
back diodes. In the voltage follower configuration, when
the input is driven by a fast large-signal pulse (>1V), the
input protection diodes effectively short the output to the
input during slewing, and a current, limited only by the
output short-circuit protection, will flow through the
diodes.
The well-known triple op amp configuration illustrates
theseconcepts.Outputoffsetisafunctionofthedifference
between the offsets of the two halves of the LT1112. This
error cancellation principle holds for a considerable num-
ber of input referred parameters in addition to offset
voltage and its drift with temperature. Input bias current
will be the average of the two noninverting input currents
The use of a feedback resistor is recommended because
this resistor keeps the current below the short-circuit
limit,resultinginfasterrecoveryandsettlingoftheoutput.
+
+
(IB ). The difference between these two currents (∆IB ) is
the offset current of the instrumentation amplifier. Com-
mon mode and power supply rejections will be dependent
only on the match between the two amplifiers (assuming
perfect resistor matching).
The input voltage of the LT1112/1114 should never ex-
ceed the supply voltages by more than a diode drop.
However, the example below shows that as the input
voltage exceeds the common mode range, the LT1112’s
Voltage Follower with Input Exceeding the Common Mode Range (VS = ±5V)
INPUT: ± 5.2V Sine Wave
LT1112 Output
OP-297 Output
111214fb
10
LT1112/LT1114
W U U
APPLICATIO S I FOR ATIO
U
Three Op Amp Instrumentation Amplifier
Typical performance of the instrumentation amplifier:
Input offset voltage = 35µV
Offset voltage drift = 0.3µV/°C
Input bias current = 80pA
Input offset current = 100pA
Input resistance = 800GΩ
Input noise = 0.42µVP-P
R4
100Ω
0.5%
R6
10k
–
IN
+
0.5%
1/2 LT1112
OR
1/4 LT1114
–
R1
10k
1%
A
–
R3
2.1k
1%
LT1097 OR
1/4LT1114
R10
1M
OUTPUT
When the instrumentation amplifier is used with high
impedancesources,theLT1114isrecommendedbecause
its CMRR vs frequency performance is better than the
LT1112’s. For example, with two matched 1MΩ source
resistors, CMRRat100Hzis100dBwiththeLT1114, 76dB
with the LT1112.
C1
33pF
+
B OR C
R8
200Ω
R2
10k
1%
R5
100Ω
0.5%
GAIN = 1000
–
TRIM R8 FOR GAIN
TRIM R9 FOR DC
COMMON MODE REJECTION
TRIM R10 FOR AC
COMMON MODE REJECTION
1/2 LT1112
OR
R7
9.88k
0.5%
1/4 LT1114
+
+
IN
D
This difference is explained by the fact that capacitance
betweenadjacentpinsonanICpackageisabout0.25pF
(including package, socket and PC board trace capaci-
tances).
R9
200Ω
LT1112/14 • AI02
The concepts of common mode and power supply rejec-
tion ratio match (∆CMRR and ∆PSRR) are best demon-
strated with a numerical example:
On the dual op amp package, positive input A is next to the
V– pin (AC ground), while positive input B has no AC
ground pin adjacent to it, resulting in a 0.25pF input
capacitance mismatch. At 100Hz, 0.25pF represents a
6.4 • 109 input impedance mismatch, which is only 76dB
higher than the 1MΩ source resistors.
Assume CMRRA = +1µV/V or 120dB,
and CMRRB = +0.75µV/V or 122.5dB,
then ∆CMRR = 0.25µV/V or 132dB;
if CMRRB = –0.75µV/V which is still 122.5dB,
then ∆CMRR = 1.75µV/V or 115dB.
On the quad package, all four inputs are adjacent to a
power supply terminal—therefore, there is no mismatch.
ClearlytheLT1112/LT1114,byspecifyingandguarantee-
ing all of these matching parameters, can significantly
improve the performance of matching-dependent
circuits.
111214fb
11
LT1112/LT1114
W
W
(1/2 LT1112, 1/4 LT1114)
SCHE ATIC DIAGRA
+
V
20µA
12pF
30k
30k
35µA
80µA
Q35 Q34
Q19
Q22
Q24
30pF
800Ω
1.5k
4k
Q33
Q21
Q6
Q27
Q5
Q25
Q29
S
Q8
Q4
28Ω
90Ω
Q7
3k
OUT
Q13
INVERTING
INPUT
Q11
Q23
2.5k
Q28
30Ω
S
S
Q20
S
Q1
Q2
–
Q26
Q3
50k
1.5k
Q12
J1
Q32
Q9
Q16
10k
Q17
NONINVERTING
INPUT
Q18
Q30
Q10
460Ω
460Ω
+
Q31
15µA
5µA
Q14
Q15
5µA
200Ω
200Ω
–
460Ω
V
Q1 TO Q4 ARE SUPERGAIN TRANSISTORS
LT1112/14 • SD01
111214fb
12
LT1112/LT1114
U
PACKAGE DESCRIPTIO
J8 Package
8-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
.405
(10.287)
MAX
CORNER LEADS OPTION
(4 PLCS)
.005
(0.127)
MIN
6
5
4
8
7
.023 – .045
(0.584 – 1.143)
HALF LEAD
OPTION
.025
.220 – .310
(5.588 – 7.874)
.045 – .068
(0.635)
RAD TYP
(1.143 – 1.650)
FULL LEAD
OPTION
1
2
3
.200
(5.080)
MAX
.300 BSC
(7.62 BSC)
.015 – .060
(0.381 – 1.524)
.008 – .018
(0.203 – 0.457)
0° – 15°
.045 – .065
(1.143 – 1.651)
.125
3.175
MIN
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE
OR TIN PLATE LEADS
.014 – .026
(0.360 – 0.660)
.100
(2.54)
BSC
J8 0801
J Package
14-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
.785
(19.939)
MAX
.005
(0.127)
MIN
14
13
12
11
10
9
8
.220 – .310
.025
(5.588 – 7.874)
(0.635)
RAD TYP
2
3
4
5
6
1
7
.200
(5.080)
MAX
.300 BSC
(7.62 BSC)
.015 – .060
(0.381 – 1.524)
.008 – .018
(0.203 – 0.457)
0° – 15°
.045 – .065
(1.143 – 1.651)
.100
(2.54)
BSC
.125
(3.175)
MIN
.014 – .026
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE
OR TIN PLATE LEADS
(0.360 – 0.660)
J14 0801
OBSOLETE PACKAGES
111214fb
13
LT1112/LT1114
U
PACKAGE DESCRIPTIO
N8 Package
8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.400*
(10.160)
MAX
8
7
6
5
4
.255 ± .015*
(6.477 ± 0.381)
1
2
3
.130 ± .005
.300 – .325
.045 – .065
(3.302 ± 0.127)
(1.143 – 1.651)
(7.620 – 8.255)
.065
(1.651)
TYP
.008 – .015
(0.203 – 0.381)
.120
.020
(0.508)
MIN
(3.048)
MIN
+.035
.325
–.015
.018 ± .003
(0.457 ± 0.076)
.100
(2.54)
BSC
+0.889
8.255
(
)
N8 1002
–0.381
NOTE:
INCHES
1. DIMENSIONS ARE
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
N Package
14-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.770*
(19.558)
MAX
14
13
12
11
10
9
8
.255 ± .015*
(6.477 ± 0.381)
1
2
3
5
6
7
4
.300 – .325
(7.620 – 8.255)
.045 – .065
(1.143 – 1.651)
.130 ± .005
(3.302 ± 0.127)
.020
(0.508)
MIN
.065
(1.651)
TYP
.008 – .015
(0.203 – 0.381)
+.035
.325
.005
(0.127)
MIN
–.015
.120
(3.048)
MIN
.018 ± .003
.100
(2.54)
BSC
+0.889
8.255
(0.457 ± 0.076)
(
)
–0.381
N14 1103
NOTE:
INCHES
MILLIMETERS
1. DIMENSIONS ARE
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
111214fb
14
LT1112/LT1114
U
PACKAGE DESCRIPTIO
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.189 – .197
(4.801 – 5.004)
.045 ±.005
NOTE 3
.050 BSC
7
5
8
6
.245
MIN
.160 ±.005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
.030 ±.005
TYP
1
3
4
2
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
(0.254 – 0.508)
× 45°
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
.008 – .010
(0.203 – 0.254)
0°– 8° TYP
.016 – .050
(0.406 – 1.270)
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
NOTE:
INCHES
1. DIMENSIONS IN
(MILLIMETERS)
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
SO8 0303
S Package
16-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.386 – .394
(9.804 – 10.008)
.045 ±.005
NOTE 3
.050 BSC
16
N
15
14
13
12
11
10
9
N
1
.245
MIN
.160 ±.005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
2
3
N/2
N/2
8
.030 ±.005
TYP
RECOMMENDED SOLDER PAD LAYOUT
3
5
6
7
1
2
4
.010 – .020
(0.254 – 0.508)
× 45°
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
.008 – .010
(0.203 – 0.254)
0° – 8° TYP
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
.016 – .050
(0.406 – 1.270)
S16 0502
NOTE:
1. DIMENSIONS IN
INCHES
(MILLIMETERS)
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
111214fb
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
15
LT1112/LT1114
U
TYPICAL APPLICATIO
Dual Buffered ±0.617V Reference Powered by Two AA Batteries
+1.5V
R *
X
15k
*OPTIONAL
1
3
2
8
+
1/2 LT1112
0.617V
–
20k
0.1%
LT1004-1.2
TOTAL SUPPLY CURRENT = 700µA
WORKS WITH BATTERIES DISCHARGED
TO ±1.3V
100pF
AT ±1.5V: MAXIMUM LOAD CURRENT = 800µA;
–
6
CAN BE INCREASED WITH OPTIONAL R , R ;
X
Y
AT R = R = 750Ω LOAD CURRENT = 2mA
X
Y
7
TEMPERATURE COEFFICIENT LIMITED BY
REFERENCE = 20ppm/°C
1/2 LT1112
4
5
+
R *
Y
20k
0.1%
*OPTIONAL
–1.5V
–0.617V
LT1112/14 • TA03
RELATED PARTS
PART NUMBER
LT1880
DESCRIPTION
COMMENTS
SOT-23
C Up to 1000pF
LOAD
Rail-to-Rail Output, Picoamp Input Precision Op Amp
LT1881/LT1882
Dual/Quad Rail-to-Rail Output, Picoamp Input Precision
Op Amp
LT1884/LT1885
LT6011/LT6012
Dual/Quad Rail-to-Rail Output, Picoamp Input Precision 9.5nV/√Hz Input Noise
Op Amp
Dual/Quad Rail-to-Rail Output, Picoamp Input Precision 135µA Supply Current, 14nV/√Hz
Op Amp
111214fb
LT 0207 REV B • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
16
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© LINEAR TECHNOLOGY CORPORATION 1992
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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