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LT1112/LT1114
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Dual/Quad Low PowerPrecision, Picoamp Input Op Amps
The LT1112 dual and LT1114 quad op amps achieve anew standard in combining low cost and outstandingprecision specifications.
The performance of the selected prime grades matches orexceeds competitive devices. In the design of the LT1112/LT1114 however, particular emphasis has been placed onoptimizing performance in the low cost plastic and SOpackages. For example, the 75V maximum offset voltagein these low cost packages is the lowest on any dual or
quad non-chopper op amp.The LT1112/LT1114 also provide a full set of matchingspecifications, facilitating their use in such matchingdependent applications as two and three op amp instru-mentation amplifiers.
Another set of specifications is furnished at1V supplies.This, combined with the low 320A supply current peramplifier, allows the LT1112/LT1114 to be powered bytwo nearly discharged AA cells.
Offset Voltage Prime Grade: 60V Max Offset Voltage Low Cost Grade
(Including Surface Mount Dual/Quad): 75V Max Offset Voltage Drift: 0.5V/C Max Input Bias Current: 250pA Max 0.1Hz to 10Hz Noise: 0.3VP-P, 2.2pAP-P Supply Current per Amplifier: 400A Max CMRR: 120dB Min Voltage Gain: 1 Million Min Guaranteed Specs with 1.0V Supplies Guaranteed Matching Specifications SO-8 Package Standard Pinout LT1114 in Narrow Surface Mount Package
Picoampere/Microvolt Instrumentation Two and Three Op Amp Instrumentation Amplifers Thermocouple and Bridge Amplifiers Low Frequency Active Filters Photo Current Amplifiers
Battery-Powered Systems
Protected by U.S. Patents 4,575,685; 4,775,884 and 4,837,496
Distribution of Input Offset Voltage(In All Packages)
INPUT OFFSET VOLTAGE (V)
70
PERCENTOFUNITS
20
25
30
10 30
15
10
50 30 10 50 70
5
0
VS= 15VTA= 25C
LT1112/14 TA02
+
1/2 LT1112
+
1/2 LT1112
LT1004-1.275k0.1%
46.4k0.1%
2
3
6
5
4
7
8
1
0.765V
RX15k
3V
2.000V
LT1112/14 TA01
TOTAL SUPPLY CURRENT = 700A
2V REFERENCE: SOURCES 1.7mA, SINKS 5mAOPTIONAL RX= 300INCREASES SOURCECURRENT TO 5mA
0.765V REFERENCE: SOURCES 5mA,SINKS 0.5mA
TEMPERATURE COEFFICIENT LIMITED
BY REFERENCE = 20ppm/C
MINIMUM SUPPLY = 2.7V
Dual Output, Buffered Reference (On Single 3V Supply)
DESCRIPTIO UFEATURES
APPLICATIO SU
TYPICAL APPLICATIO U
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
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ORDER PARTNUMBER
ORDER PARTNUMBER
S8 PART MARKING
TJMAX= 150C, JA= 190C/W
LT1112S8LT1112IS8LT1112MPS8
LT1112ACN8LT1112CN8LT1112IN8
11121112I1112MP
ORDER PARTNUMBER
ORDER PARTNUMBER
LT1114SLT1114IS
LT1114ACNLT1114CNLT1114IN
TJMAX= 150C, JA= 110C/W
J8 PACKAGE 8-LEAD CERDIP
TJMAX= 160C, JA= 100C/W
TJMAX= 150C, JA= 150C/W
TOP VIEW
OUT A
IN A
+IN A
V
V+
OUT B
IN B
+IN B
N8 PACKAGE8-LEAD PDIP
1
2
3
4
8
7
6
5
A
B
1
2
3
4
5
6
7
TOP VIEW
N PACKAGE14-LEAD PDIP
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
A D
B C
1
2
3
4
8
7
6
5
TOP VIEW
V+
OUT B
IN B
+IN B
OUT A
IN A
+IN A
V
S8 PACKAGE8-LEAD PLASTIC SO
B
A
TOP VIEW
S PACKAGE16-LEAD PLASTIC SO (NARROW)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
OUT A
IN A
+IN A
V+
+IN B
IN B
OUT B
NC
OUT D
IN D
+IN D
V
+IN C
IN C
OUT C
NC
A D
B C
(Note 1)ABSOLUTE AXI U RATI GSW WW U
LT1112AMJ8LT1112MJ8
TJMAX= 150C, JA= 130C/W
OBSOLETE PACKAGEConsider the N8 Package for Alternate Source
LT1114AMJLT1114MJ
J PACKAGE 14-LEAD CERDIP
TJMAX= 160C, JA= 80C/W (J)
OBSOLETE PACKAGEConsider the N Package for Alternate Source
PACKAGE/ORDER I FOR ATIOU UW
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Supply Voltage ..................................................... 20VDifferential Input Current (Note 2) ..................... 10mAInput Voltage (Equal to Supply Voltage) ............... 20VOutput Short-Circuit Duration ......................... IndefiniteStorage Temperature Range ................ 65C to 150CLead Temperature (Soldering, 10 sec)................ 300COperating Temperature Range (Note 11)
LT1112AM/LT1112MLT1114AM/LT1114M (OBSOLETE) ... 55C to 125CLT1112AC/LT1112C/LT1112S8LT1114AC/LT1114C/LT1114S .......... 40C to 85CLT1112I/LT1114I .............................. 40C to 85CLT1112MPS8 ................................... 55C to 125C
Specified Temperature Range (Note 12)LT1112AM/LT1112MLT1114AM/LT1114M (OBSOLETE) ... 55C to 125CLT1112AC/LT1112C/LT1112S8LT1114AC/LT1114C/LT1114S .......... 40C to 85CLT1112I/LT1114I .............................. 40C to 85CLT1112MPS8 ................................... 55C to 125C
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SYMBOL PARAMETER CONDITIONS (Note 3) MIN TYP MAX MIN TYP MAX UNITS
VOS Input Offset Voltage 20 60 25 75 VVS= 1.0V 40 110 45 130 V
VOS Long Term Input Offset 0.3 0.3 V/MoTime Voltage Stability
IOS Input Offset Current 50 180 60 230 pALT1114S/LT1114IS 75 330 pA
IB Input Bias Current 70 250 80 280 pALT1114S/LT1114IS 100 450 pA
en Input Noise Voltage 0.1Hz to 10Hz (Note 10) 0.3 0.9 0.3 0.9 VP-P
Input Noise Voltage Density fO= 10Hz (Note 10) 16 28 16 28 nV/ HzfO= 1000Hz (Note 10) 14 18 14 18 nV/ Hz
in Input Noise Current 0.1Hz to 10Hz 2.2 2.2 pAP-P
Input Noise Current Density fO= 10Hz 0.030 0.030 pA/ HzfO= 1000Hz 0.008 0.008 pA/ Hz
VCM Input Voltage Range 13.5 14.3 13.5 14.3 V
CMRR Common Mode Rejection Ratio VCM= 13.5V 120 136 115 136 dB
PSRR Power Supply Rejection Ratio VS= 1.0V to 20V 116 126 114 126 dB
Minimum Supply Voltage (Note 5) 1.0 1.0 V
RIN Input Resistance Differential Mode (Note 4) 20 50 15 40 M Common Mode 800 700 G
AVOL Large-Signal Voltage Gain VO= 12V, RL= 10k 1000 5000 800 5000 V/mVVO= 10V, RL= 2k 800 1500 600 1300 V/mV
VOUT
Output Voltage Swing RL= 10k 13.0 14.0 13.0 14.0 V
RL= 2k 11.0 12.4 11.0 12.4 V
SR Slew Rate 0.16 0.30 0.16 0.30 V/ s
GBW Gain-Bandwidth Product fO= 10kHz 450 750 450 750 kHz
IS Supply Current per Amplifier 350 400 350 450 AVS= 1.0V 320 370 320 420 A
Channel Separation fO= 10Hz 150 150 dB
VOS Offset Voltage Match (Note 6) 35 100 40 130 V
IB+ Noninverting Bias Current Match 100 450 100 500 pA(Notes 6, 7) LT1114S/LT1114IS 120 680 pA
CMRR Common Mode Rejection Match (Notes 6, 8) 117 136 113 136 dB
PSRR Power Supply Rejection Match (Notes 6, 8) 114 130 112 130 dB
VS= 15V, VCM= 0V, TA= 25C, unless otherwise noted.
LT1112AM/ACLT1114AM/AC
LT1112M/C/ILT1114M/C/I
ELECTRICAL CHARACTERISTICS
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SYMBOL PARAMETER CONDITIONS (Note 3) MIN TYP MAX MIN TYP MAX UNITSVOS Input Offset Voltage 35 120 45 150 V
LT1112MPS8 45 160 VVS= 1.2V 60 220 70 260 V
VOS Average Input Offset Voltage Drift (Note 9) 0.15 0.5 0.20 0.75 V/CTemp LT1112MPS8 0.4 1.3 V/C
IOS Input Offset Current 80 400 100 500 pA
IB Input Bias Current 150 600 170 700 pA
VCM Input Voltage Range 13.5 14.1 13.5 14.1 V
CMRR Common Mode Rejection Ratio VCM= 13.5V 116 130 111 130 dB
PSRR Power Supply Rejection Ratio VS= 1.2V to 20V 112 124 110 124 dB
AVOL Large-Signal Voltage Gain VO= 12V, RL= 10k 500 2500 400 2500 V/mV
VO= 10V, RL= 2k 200 600 170 500 V/mVVOUT Output Voltage Swing RL= 10k 13.0 13.85 13.0 13.85 V
SR Slew Rate 0.12 0.22 0.12 0.22 V/ s
IS Supply Current per Amplifier 380 460 380 530 A
VOS Offset Voltage Match (Note 6) 55 200 70 240 VLT1112MPS8 70 270 V
Offset Voltage Match Drift 0.2 0.7 0.3 1.0 V/C(Notes 6, 9) LT1112MPS8 0.5 1.9 V/C
IB+ Noninverting Bias Current Match (Notes 6, 7) 150 750 170 850 pA
CMRR Common Mode Rejection Ratio (Notes 6, 8) 112 130 106 130 dB
PSRR Power Supply Rejection Ratio (Notes 6, 8) 109 126 106 126 dB
The denotes the specifications which apply over the full operatingtemperature range of 55C TA125C, otherwise specifications are at TA= 25C. VS= 15V, unless otherwise noted.
LT1112AMJ8LT1114AMJ
LT1112MJ8/MPS8LT1114MJ
ELECTRICAL CHARACTERISTICS
The denotes the specifications which apply over the full operating temperature range of 0C TA70C, otherwise specificationsare at TA= 25C. VS= 15V, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS (Note 3) MIN TYP MAX MIN TYP MAX UNITS
VOS Input Offset Voltage LT1112CN8 27 100 30 125 VLT1112S8, LT1114CN/S 35 125 45 150 VVS= 1.2V 50 175 65 210 V
VOS Average Input Offset Voltage Drift LT1112CN8 0.15 0.5 0.2 0.75 V/CTemp (Note 9) LT1112S8, LT1114CN/S 0.3 1.1 0.4 1.3 V/C
IOS Input Offset Current 60 220 70 290 pALT1114S 90 420 pA
IB Input Bias Current 80 300 90 350 pALT1114S 115 550 pA
VCM Input Voltage Range 13.5 14.2 13.5 14.2 V
CMRR Common Mode Rejection Ratio VCM= 13.5V 118 133 113 133 dB
PSRR Power Supply Rejection Ratio VS= 1.2V to 20V 114 125 112 125 dB
AVOL Large-Signal Voltage Gain VO= 12V, RL= 10k 800 4000 650 4000 V/mVVO= 10V, RL= 2k 500 1300 400 1000 V/mV
VOUT Output Voltage Swing RL= 10k 13.0 13.9 13.0 13.9 V
SR Slew Rate 0.14 0.27 0.14 0.27 V/ s
LT1112ACN8LT1114ACN
LT1112CN8/S8/IS8LT1114CN/S/IS
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The denotes the specifications which apply over the full operatingtemperature range of 0C TA70C, otherwise specifications are at TA= 25C. VS= 15V, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS (Note 3) MIN TYP MAX MIN TYP MAX UNITSIS Supply Current per Amplifier 370 440 370 500 A
VOS Offset Voltage Match LT1112CN8 45 170 55 210 V(Note 6) LT1112S8, LT1114CN/S 55 220 70 270 V
Offset Voltage Match Drift LT1112N8 0.2 0.7 0.3 1.0 V/C(Notes 6, 9) LT1112S8, LT1114CN/S 0.4 1.6 0.5 1.9 V/C
IB+ Noninverting Bias Current Match 120 530 135 620 pA(Notes 6, 7) LT1114S 160 880 pA
CMRR Common Mode Rejection Ratio (Notes 6, 8) 114 134 109 134 dB
PSRR Power Supply Rejection Ratio (Notes 6, 8) 110 128 108 128 dB
LT1112ACN8LT1114ACN
LT1112CN8/S8/IS8LT1114CN/S/IS
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS (Note 3) MIN TYP MAX MIN TYP MAX UNITS
VOS Input Offset Voltage LT1112CN8/IN8 30 110 35 135 VLT1112S8/IS8, LT1114CN/S/IS 40 135 45 160 VVS= 1.2V 55 200 60 240 V
VOS Average Input Offset Voltage Drift LT1112CN8/IN8 0.15 0.50 0.20 0.75 V/CTemp LT1112S8/IS8, LT1114CN/S/IS 0.30 1.10 0.40 1.30 V/C
IOS Input Offset Current 70 330 85 400 pALT1114S/IS 110 600 pA
IB Input Bias Current 110 500 120 550 pALT1114S/IS 150 800 pA
VCM Input Voltage Range 13.5 14.1 13.5 14.1 VCMRR Common Mode Rejection Ratio VCM= 13.5V 117 132 112 132 dB
PSRR Power Supply Rejection Ratio VS= 1.2V to 20V 113 125 111 125 dB
AVOL Large-Signal Voltage Gain VO= 12V, RL= 10k 700 3300 600 3300 V/mVVO= 10V, RL= 2k 400 1100 300 900 V/mV
VOUT Output Voltage Swing RL= 10k 13.0 13.85 13.0 13.85 V
SR Slew Rate 0.13 0.24 0.13 0.24 V/ s
IS Supply Current per Amplifier 370 450 370 510 A
VOS Offset Voltage Match LT1112CN8/IN8 50 180 60 225 V(Note 6) LT1112S8/IS8, LT1114CN/S/IS 60 230 70 270 V
Offset Voltage Match Drift LT1112CN8/IN8 0.2 0.7 0.3 1.0 V/C(Notes 6) LT1112S8/IS8, LT1114CN/S/IS 0.4 1.6 0.5 1.9 V/C
IB+ Noninverting Bias Current Match 140 660 155 770 pA(Notes 6, 7) LT1114S/IS 190 1300 pA
CMRR Common Mode Rejection Ratio (Notes 6, 8) 113 133 109 133 dB
PSRR Power Supply Rejection Ratio (Notes 6, 8) 110 127 107 127 dB
The denotes the specifications which apply over the full operating temperature range of 40C TA85C, otherwise specificationsare at TA= 25C. VS= 15V, unless otherwise noted. (Note 12)
LT1112ACN8LT1114ACN
LT1112CN8/IN8/S8/IS8LT1114CN/S/IS
Note 1:Stresses beyond those listed under Absolute Maximum Ratingsmay cause permanent damage to the device. Exposure to any AbsoluteMaximum Rating condition for extended periods may affect devicereliability and lifetime.
Note 2:Differential input voltages greater than 1V will cause excessivecurrent to flow through the input protection diodes unless limitingresistance is used.
Note 3:Typical parameters are defined as the 60% yield of parameterdistributions of individual amplifiers; i.e., out of 100 LT1114s (or 100LT1112s) typically 240 op amps (or 120) will be better than the indicatedspecification.Note 4:This parameter is guaranteed by design and is not tested.
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Note 5:Offset voltage, supply current and power supply rejection ratio aremeasured at the minimum supply voltage.Note 6:Matching parameters are the difference between amplifiers A andD and between B and C on the LT1114; between the two amplifiers on theLT1112.Note 7:This parameter is the difference between two noninverting inputbias currents.Note 8:CMRR and PSRR are defined as follows: (1) CMRR and PSRRare measured in V/V on the individual amplifiers. (2) The difference iscalculated between the matching sides in V/V. (3) The result is convertedto dB.Note 9:This parameter is not 100% tested.
ELECTRICAL CHARACTERISTICS
Note 10:These parameters are not tested. More than 99% of the op ampstested 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 thetemperature range of 40C to 85C.
Note 12: The LT1112AC/LT1112C/LT1112S8/LT1114AC/LT1114C/LT1114S are guaranteed to meet specified performance from 0C to 70Cand are designed, characterized and expected to meet specifiedperformance from 40C to 85C, but are not tested or QA sampled atthese temperatures. The LT1112I/LT1114I are guaranteed to meetspecified performance from 40C to 85C.
TYPICAL PERFOR A CE CHARACTERISTICSUW
Input Bias and Offset Current,Noninverting Bias Current Matchvs Temperature
TEMPERATURE (C)
75200
INPU
TBIAS,
OFFSET,
MATCHCURRENT(pA)
100
0
100
200
50 25 0 25
LT1112/14 TPC01
50 75 100 125
IB+
IOS
IB (OVERCANCELLED)
VS= 15V
IB (UNDERCANCELLED)
Input Bias Current OverCommon Mode Range
Distribution of Input Bias Current(In All Packages Except LT1114S)
INPUT OFFSET VOLTAGE (V)
800
PERCENT
OFUNITS
5
15
20
25
40 0 20 100
LT1112/14 TPC06
10
60 20 40 60 80
30TA= 25C
Drift with TemperatureLT1112S8, LT1114N/S
Distribution of Offset Voltage atVS= 1.0V (In All Packages)
INPUT BIAS CURRENT (pA)
3000
PERCENTOFUNITS
10
20
30
200 100 0 100
LT1112/14 TPC03
200 300
VS= 15VTA= 25C
Drift with TemperatureLT1112N8/J8, LT1114J
OFFSET VOLTAGE DRIFT WITH TEMPERATURE (V/C)
0.8
PERCENT
OFINPUTS
10
15
0.8
LT1112/14 TPC04
5
00.4 0 0.4
20
0.6 0.2 0.2 0.6
850 OP AMPS TESTED100 LT1112J8165 LT1112N880 LT1114J
VS= 15V
COMMON MODE INPUT VOLTAGE (V)
15150
INPUTBIASCURRENT(pA)
100
50
0
50
150
10 5 0 5
LT1112/14 TPC02
10 15
100
+IB
VCM
VS= 15VTA= 25CRINCM= 800G
DEVICE WITH POSITIVE INPUT CURRENT
DEVICE WITH NEGATIVE INPUT CURRENT
OFFSET VOLTAGE DRIFT WITH TEMPERATURE (V/C)
1.40
PERCENT
OFUNITS
10
25
0.6 0.2 0.6
LT1112/14 TPC05
5
20
15
1.0 0.2 1.0 1.4
960 OP AMPS TESTED240 LT1112S880 LT1114N40 LT1114S
VS= 15V
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Distribution of Offset VoltageMatch Drift (LT1112J8, LT1112N8,
LT1114J Packages)
Distribution of Offset
Voltage Match
VOS, OFFSET VOLTAGE MATCH (V)100
PERCENTOFUNITS
15
20
25
60
LT1112/14 TPC07
10
5
0
60 20 20 1004080 40 0 80
VS= 15VTA= 25C
OFFSET VOLTAGE MATCH DRIFT (V/C)
0.80
PERCENTONUNITS
5
10
15
20
0.4 0 0.4 0.8
LT1112/14 TPC08
25
30
0.6 0.2 0.2 0.6
VS= 15V342 PAIRS TESTED
OFFSET VOLTAGE MATCH DRIFT (V/C)
1.60
PERCENTOFUNITS
5
10
15
20
1.2 0.8 0.4 0
LT1112/14 TPC09
0.4 0.8 1.2 1.6
VS= 15V364 PAIRS TESTED
Distribution of Offset VoltageMatch Drift (LT1112S8, LT1114N,
LT1114S Packages)
TYPICAL PERFOR A CE CHARACTERISTICSUW
0.1Hz to 10Hz Noise 0.01Hz to 1Hz Noise
Supply Current per Amplifiervs Supply Voltage
TIME (MONTHS)
06
CHANGEINOFFSETVOLTAGE(V)
4
2
0
2
6
1 2 3 4
LT1112/14 TPC14
5 6
4
VS= 15VTA= 25C 2A
2B
1A
1B
3A
3B
Long Term Stability of ThreeRepresentative UnitsWarm-Up Drift
SUPPLY VOLTAGE (V)
0
SUPPLYCURRENTPERAMP
LIFIER(A)
400
500
20
LT1112/14 TPC15
300
2005 10 15
600
TA= 125C
TA= 25C
TA= 55C
Noise Spectrum
FREQUENCY (Hz)
11
10
100
1000
10 100 1000
LT1112/14 TPC10
VOLTA
GENOISEDENSITY(nV/Hz)
CURRENTNOISEDENSITY(fA/Hz)
VS= 1V TO 20VTA= 25C
CURRENT NOISE
VOLTAGE NOISE
1/fCORNER2.5Hz
1/fCORNER140Hz
TIME (SEC)
0
NO
ISEVOLTAGE(0.2V/DIV)
8
LT1112/14 TPC11
2 4 6 10
VS= 15VTA= 25C
TIME AFTER POWER ON (MINUTES)
00
CHANGEINOFFSETVOLT
AGE(V)
1
2
3
0.5 1.0 1.5 2.0
LT1112/14 TPC13
2.5
VS= 15VTA= 25C
LT1112S8, LT1114N/S PACKAGES
LT1114J PACKAGE
LT1112J8, N8 PACKAGES
TIME (SEC)
0
NO
ISEVOLTAGE(0.2V/DIV)
80
LT1112/14 TPC12
20 40 60 100
VS= 15VTA= 25C
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Common Mode Range andVoltage Swing with Respect to
Supply Voltages
Output Voltage Swing
vs Load Current
Minimum Supply Voltage vs TempVoltage Gain at Minimum Supply
Voltage
OUTPUT CURRENT (mA)
9
V+ 1
0 6
LT1112/14 TPC18
6 3 3 9
V
OUTPUTSWING(V)
V+
V+ 2
V+ 3
V + 3
V + 2
V + 1
SINK SOURCE
VS= 1V TO 20VTA= 25CMAX ILAT 1V = 1.3mA AT 1.5V = 3mA
TEMPERATURE (C)75
VCOMMONMODERANGEOROUTPUTSWING(V) V+
25
LT1112/14 TPC17
V+ 0.2
25 125
V+ 0.4
V+ 0.6
V+ 0.8
V+ 1.0
V+ 0.8
V+ 0.6
V+ 0.4
V+ 0.2
75
VS= 1V TO 20VIL< 100A
SWING
CM RANGE
SWING
CM RANGE
TEMPERATURE (C)50
MINIMUMSUPPLY(V)
60
80
100
1.2
0.9
0 50 75
LT1112/14 TPC16
40
1.0
1.1
25 25 100 125
VOLTAGEGAIN(V/mV)
TYPICAL PERFOR A CE CHARACTERISTICSUW
Power Supply Rejectionvs Frequency
Voltage Gain
OUTPUT VOLTAGE (V)
1515
CHAN
GEINOFFSETVOLTAGE(V)
10
5
0
5
15
10 5 0 5
LT1112/14 TPC19
10 15
10
VS= 15VTA= 25C
RL= 10k
RL= 2k
FREQUENCY (Hz)
0.1
POWERSUPPLYREJECTIO
NRATIO(dB)
100
120
140
100 10k
LT1112/14 TPC23
80
60
1 10 1k 100k 1M
40
20
VS= 15VTA= 25C
POSITIVESUPPLY
NEGATIVESUPPLY
FREQUENCY (Hz)
1
80
100
120
1k 100k
LT1112/14 TPC22
60
40
10 100 10k 1M
20
0
COMMONMODEREJECTIONRATIO(dB)
140VS= 15VTA= 25C
Common Mode Rejectionvs Frequency Channel Separation vs Frequency
Gain, Phase Shift vs FrequencyVoltage Gain vs Frequency
FREQUENCY (Hz)
0.01
VOLTAGEGAIN(dB)
60
80
100
1M
LT1112/14 TPC20
40
20
201 100 10k
0
140
120
0.1 10M10 1k 100k
VS= 15VTA= 25C
FREQUENCY (MHz)
0.0110
GAIN(dB) 20
30
40
0.1 1 10
LT1112/14 TPC21
10
0
VS= 15VTA= 25C
PHASE
GAIN
PHASE MARGIN = 70C
200
140
120
100
160
180
PHASESHIFT(DEG)
FREQUENCY (Hz)
1
CHANNELSEPARATION(dB)
80
100
120
10k
160
LT1112/14 TPC24
100 1M
140
10 100k1k
VS= 15VTA= 25C
AMP 1 IN UNITY-GAIN20VP-P, RL= 2kAMP 2 IN GAIN = 1000RS= 100, RF= 100k
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Slew Rate, Gain-BandwidthProduct and Phase Margin
vs Temperature Closed-Loop Output Impedance Capacitive Loading Handling
FREQUENCY (Hz)1
0.001
OUTPUTIMPEDANCE()
0.01
0.1
1
10
1000
10 100 1k 10k
LT1112/14 TPC26
100k 1M
100
VS= 15VTA= 25C
AV= 100 AV= +1
CAPACITIVE LOAD (F)0.00001
0
OVERSHOOT(%)
20
40
60
80
120
0.0001 0.001 0.01 0.1
LT1112/14 TPC27
1 10
100
VS= 15VTA= 25C
AV= 10
AV= +1
TEMPERATURE (C)50
600GAIN-BANDWIDTH
PRODUCT(kHz)
800
0.4
0 50 75
LT1112/14 TPC25
700
0.3
0.2
25 25 100 125
SLEWR
ATE(V/s)
80
70
60
PHASEMARGIN(DEG)
m
GBW
SLEW
TYPICAL PERFOR A CE CHARACTERISTICSUW
FREQUENCY (kHz)
1
16
PEAK-TO-PEAKOUTPUTVOLTAGE(V)
20
24
28
10 100 1000
LT1112/14 TPC30
12
8
4
0
VS= 15V
VS= 5V
TA= 25CRL= 10k
20mV/DIV
Large-Signal Transient Response
5V/DIV
Small-Signal Transient Response
50s/DIV2s/DIV
AV= +1CL= 500pFVS= 15V
AV= +1RF= 10kCF= 100pFVS= 15V
Undistorted Output Voltagevs Frequency
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Voltage Follower with Input Exceeding the Common Mode Range (VS= 5V)
INPUT: 5.2V Sine Wave LT1112 Output OP-297 Output
The LT1112 dual and LT1114 quad in the plastic andceramic DIP packages are pin compatible to and directlyreplace such precision op amps as the OP-200, OP-297,AD706 duals and OP-400, OP-497, AD704 quads withimproved price/performance.
The LT1112 in the S8 surface mount package has thestandard pin configuration, i.e., the same configuration asthe plastic and ceramic DIP packages.
The LT1114 quad is offered in the narrow 16-pin surfacemount package. All competitors are in the wide 16-pinpackage which occupies 1.8 times the area of the narrowpackage. The wide package is also 1.8 times thicker thanthe narrow package.
The inputs of the LT1112/1114 are protected with back-to-back diodes. In the voltage follower configuration, whenthe input is driven by a fast large-signal pulse (>1V), theinput protection diodes effectively short the output to theinput during slewing, and a current, limited only by theoutput short-circuit protection, will flow through thediodes.
The use of a feedback resistor is recommended becausethis resistor keeps the current below the short-circuitlimit, resulting in faster recovery and settling of the output.
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 inputvoltage exceeds the common mode range, the LT1112s
output clips cleanly, without any glitches or phase rever-sal. The OP-297 exhibits phase reversal. The photos alsoillustrate that both the input and output ranges of theLT1112 are within 800mV of the supplies. The effect ofinput and output overdrive on the other amplifiers in theLT1112 or LT1114 packages is negligible, as eachamplifier is biased independently.
Advantages of Matched Dual and Quad Op Amps
In many applications the performance of a system de-pends on the matching between two operational amplifiersrather than the individual characteristics of the two opamps. Two or three op amp instrumentation amplifiers,
tracking voltage references and low drift active filters aresome of the circuits requiring matching between two opamps.
The well-known triple op amp configuration illustratesthese concepts. Output offset is a function of the differencebetween the offsets of the two halves of the LT1112. Thiserror cancellation principle holds for a considerable num-ber of input referred parameters in addition to offsetvoltage and its drift with temperature. Input bias currentwill be the average of the two noninverting input currents(I
B
+). The difference between these two currents (IB
+) isthe offset current of the instrumentation amplifier. Com-mon mode and power supply rejections will be dependentonly on the match between the two amplifiers (assumingperfect resistor matching).
APPLICATIO S I FOR ATIOWU UU
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The concepts of common mode and power supply rejec-tion ratio match (CMRR and PSRR) are best demon-strated with a numerical example:
Assume CMRRA= +1V/V or 120dB,and CMRRB= +0.75V/V or 122.5dB,then CMRR = 0.25V/V or 132dB;if CMRRB= 0.75V/V which is still 122.5dB,then CMRR = 1.75V/V or 115dB.
Clearly the LT1112/LT1114, by specifying and guarantee-ing all of these matching parameters, can significantlyimprove the performance of matching-dependentcircuits.
Three Op Amp Instrumentation Amplifier
APPLICATIO S I FOR ATIOWU UU
+
+1/2 LT1112
OR1/4 LT1114
A
1/2 LT1112OR
1/4 LT1114
D
IN
IN+
R110k1%
R32.1k1%
R8200
R210k1%
R4
1000.5%
R51000.5%
C133pF
R101M
R6
10k0.5%
R7
9.88k0.5%
R9200
OUTPUT
+
LT1097 OR1/4LT1114
B OR C
GAIN = 1000
TRIM R8 FOR GAIN
TRIM R9 FOR DCCOMMON MODE REJECTION
TRIM R10 FOR ACCOMMON MODE REJECTION
LT1112/14 AI02
Typical performance of the instrumentation amplifier:
Input offset voltage = 35V
Offset voltage drift = 0.3V/CInput bias current = 80pAInput offset current = 100pAInput resistance = 800GInput noise = 0.42VP-P
When the instrumentation amplifier is used with highimpedance sources, the LT1114 is recommended becauseits CMRR vs frequency performance is better than theLT1112s. For example, with two matched 1Msourceresistors, CMRR at 100Hz is 100dB with the LT1114, 76dBwith the LT1112.
This difference is explained by the fact that capacitancebetween adjacent pins on an IC package is about 0.25pF(including package, socket and PC board trace capaci-tances).
On the dual op amp package, positive input A is next to theV pin (AC ground), while positive input B has no ACground pin adjacent to it, resulting in a 0.25pF inputcapacitance mismatch. At 100Hz, 0.25pF represents a6.4 109input impedance mismatch, which is only 76dBhigher than the 1Msource resistors.
On the quad package, all four inputs are adjacent to apower supply terminaltherefore, there is no mismatch.
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(1/2 LT1112, 1/4 LT1114)
12pF 30k
Q35
800 30pF
Q34
Q5Q6
4k
35A
20A
Q22
Q21
Q8Q4
Q7
Q13
Q3
SQ2
S
Q1
SINVERTING
INPUT
NONINVERTINGINPUT
S
Q9
Q10
Q11
50k 1.5k
Q12
V
15A
5A
5A
J1
460
Q15Q14
460460
Q17
Q25
Q19
Q27
1.5k
Q33
Q29
80A
28
90
30
Q20
OUT
Q26
Q30
Q31
200200
V+
Q24
Q16
2.5k
Q32
Q28
Q1 TO Q4 ARE SUPERGAIN TRANSISTORS LT1112/14 SD01
10kQ18
+
30k
Q23
3k
SCHE ATIC DIAGRAWW
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UPACKAGE DESCRIPTIO
J8 Package8-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
J Package14-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
J8 0801
.014 .026
(0.360 0.660)
.200
(5.080)
MAX
.015 .060(0.381 1.524)
.125
3.175MIN
.100(2.54)BSC
.300 BSC
(7.62 BSC)
.008 .018
(0.203 0.457)0 15
.005
(0.127)MIN
.405
(10.287)MAX
.220 .310
(5.588 7.874)
1 2 3 4
8 7 6 5
.025
(0.635)RAD TYP
.045 .068
(1.143 1.650)FULL LEAD
OPTION
.023 .045
(0.584 1.143)HALF LEAD
OPTION
CORNER LEADS OPTION(4 PLCS)
.045 .065
(1.143 1.651)NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATEOR TIN PLATE LEADS
J14 0801
.045 .065
(1.143 1.651)
.100(2.54)BSC.014 .026
(0.360 0.660)
.200
(5.080)MAX
.015 .060
(0.381 1.524)
.125
(3.175)MIN
.300 BSC
(7.62 BSC)
.008 .018
(0.203 0.457)0 15
1 2 3 4 5 6 7
.220 .310
(5.588 7.874)
.785
(19.939)MAX
.005
(0.127)
MIN 14 11 891013 12
.025
(0.635)RAD TYP
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATEOR TIN PLATE LEADS
OBSOLETE PACKAGES
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N8 Package8-Lead PDIP (Narrow .300 Inch)(Reference LTC DWG # 05-08-1510)
N Package14-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
UPACKAGE DESCRIPTIO
N8 1002
.065(1.651)
TYP
.045 .065
(1.143 1.651)
.130 .005
(3.302 0.127)
.020
(0.508)MIN.018 .003
(0.457 0.076)
.120
(3.048)MIN
1 2 3 4
8 7 6 5
.255 .015*
(6.477 0.381)
.400*
(10.160)MAX
.008 .015
(0.203 0.381)
.300 .325
(7.620 8.255)
.325+.035.015
+0.8890.381
8.255( )NOTE:
1. DIMENSIONS AREINCHES
MILLIMETERS*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
.100
(2.54)
BSC
N14 1103
.020
(0.508)
MIN
.120
(3.048)MIN
.130 .005
(3.302 0.127)
.045 .065
(1.143 1.651)
.065
(1.651)TYP
.018 .003
(0.457 0.076)
.005
(0.127)
MIN
.255 .015*
(6.477 0.381)
.770*
(19.558)
MAX
31 2 4 5 6 7
891011121314
.008 .015
(0.203 0.381)
.300 .325
(7.620 8.255)
.325+.035.015
+0.8890.381
8.255( )NOTE:
1. DIMENSIONS AREINCHES
MILLIMETERS*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
.100
(2.54)
BSC
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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-tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
S8 Package8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
S Package
16-Lead Plastic Small Outline (Narrow .150 Inch)(Reference LTC DWG # 05-08-1610)
UPACKAGE DESCRIPTIO
.016 .050
(0.406 1.270)
.010 .020(0.254 0.508)
45
0 8TYP.008 .010
(0.203 0.254)
SO8 0303
.053 .069
(1.346 1.752)
.014 .019
(0.355 0.483)TYP
.004 .010
(0.101 0.254)
.050
(1.270)BSC
1 2 3 4
.150 .157
(3.810 3.988)
NOTE 3
8 7 6 5
.189 .197
(4.801 5.004)NOTE 3
.228 .244
(5.791 6.197)
.245MIN .160 .005
RECOMMENDED SOLDER PAD LAYOUT
.045 .005.050 BSC
.030 .005TYP
INCHES
(MILLIMETERS)
NOTE:1. DIMENSIONS IN
2. DRAWING NOT TO SCALE3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
.016 .050
(0.406 1.270)
.010 .020
(0.254 0.508)45
0 8TYP.008 .010
(0.203 0.254)
1
N
2 3 4 5 6 7 8
N/2
.150 .157
(3.810 3.988)NOTE 3
16 15 14 13
.386 .394
(9.804 10.008)NOTE 3
.228 .244
(5.791 6.197)
12 11 10 9
S16 0502
.053 .069
(1.346 1.752)
.014 .019
(0.355 0.483)
TYP
.004 .010
(0.101 0.254)
.050
(1.270)BSC
.245MIN
N
1 2 3 N/2
.160 .005
RECOMMENDED SOLDER PAD LAYOUT
.045 .005.050 BSC
.030 .005TYP
INCHES
(MILLIMETERS)
NOTE:1. DIMENSIONS IN
2. DRAWING NOT TO SCALE3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
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LT 0207 REV B PRINTED IN USA
Dual Buffered 0.617V Reference Powered by Two AA Batteries
+
1/2 LT1112
15k
3
2
7
4
6
5
8
1
RX*
*OPTIONAL
+1.5V
0.617V
LT1004-1.2
100pF
RY*
*OPTIONAL
+
1.5V0.617V
TOTAL SUPPLY CURRENT = 700A
WORKS WITH BATTERIES DISCHARGEDTO 1.3V
AT 1.5V: MAXIMUM LOAD CURRENT = 800A;CAN BE INCREASED WITH OPTIONAL RX, RY;AT RX= RY= 750LOAD CURRENT = 2mA
TEMPERATURE COEFFICIENT LIMITED BYREFERENCE = 20ppm/C
LT1112/14 TA03
1/2 LT1112
20k0.1%
20k0.1%
TYPICAL APPLICATIO U
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
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Linear Technology Corporation