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LT1112/LT1114 Dual/Quad Low Power Precision, Picoamp Input Op Amps
FEATURES
s s s
DESCRIPTIO
s s s s s s s s s
S8 Package - Standard Pinout 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 LT1114 in Narrow Surface Mount Package
The LT1112 dual and LT1114 quad op amps achieve a new standard in combining low cost and outstanding precision specifications. 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 75V maximum offset voltage in 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 matching specifications, facilitating their use in such matching dependent applications as two and three op amp instrumentation amplifiers. Another set of specifications is furnished at 1V supplies. This, combined with the low 320A supply current per amplifier, allows the LT1112/LT1114 to be powered by two nearly discharged AA cells.
Protected by U.S. Patents 4,575,685; 4,775,884 and 4,837,496
APPLICATI
s s s s s s
S
Picoampere/Microvolt Instrumentation Two and Three Op Amp Instrumentation Amplifers Thermocouple and Bridge Amplifiers Low Frequency Active Filters Photo Current Amplifiers Battery-Powered Systems
Dual Output, Buffered Reference (On Single 3V Supply)
TOTAL SUPPLY CURRENT = 700A 2V REFERENCE: SOURCES 1.7mA, SINKS 5mA RX OPTIONAL RX = 300 INCREASES SOURCE CURRENT TO 5mA 0.765V REFERENCE: SOURCES 5mA, SINKS 0.5mA TEMPERATURE COEFFICIENT LIMITED BY REFERENCE = 20ppm/C 2.000V MINIMUM SUPPLY = 2.7V 3V
30 25
15k
PERCENT OF UNITS
75k 0.1%
LT1004-1.2
46.4k 0.1%
+
5
-
6
+
3
-
2
8 1
20 15 10 5
1/2 LT1112
1/2 LT1112 4
7
0.765V
0 -70 -50
LT1112/14 * TA01
U
Distribution of Input Offset Voltage (In All Packages)
VS = 15V TA = 25C 50 30 -30 -10 10 INPUT OFFSET VOLTAGE (V) 70
LT1112/14 * TA02
UO
1
LT1112/LT1114 ABSOLUTE AXI U RATI GS
Operating Temperature Range LT1112AM/LT1112M LT1114AM/LT1114M ...................... - 55C to 125C LT1112AC/LT1112C/LT1112S8 LT1114AC/LT1114C/LT1114S .......... - 40C to 85C
Supply Voltage ..................................................... 20V Differential Input Current (Note 1) ..................... 10mA Input Voltage (Equal to Supply Voltage) ............... 20V Output Short-Circuit Duration ......................... Indefinite Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................ 300C
PACKAGE/ORDER I FOR ATIO
TOP VIEW OUT A 1 -IN A 2 +IN A 3 V- 4 J8 PACKAGE 8-LEAD CERAMIC DIP B 5 +IN B A 8 7 6 V
+
ORDER PART NUMBER LT1112AMJ8 LT1112MJ8 LT1112ACN8 LT1112CN8
OUT B -IN B
N8 PACKAGE 8-LEAD PLASTIC DIP
TJMAX = 160C, JA = 100C/W (J8) TJMAX = 140C, JA = 130C/W (N8)
TOP VIEW OUT A -IN A +IN A V+ +IN B -IN B OUT B 1 2 3 4 5 6 7 B C A D 14 OUT D 13 -IN D 12 +IN D 11 V - 10 +IN C 9 8 -IN C OUT C
ORDER PART NUMBER LT1114AMJ LT1114MJ LT1114ACN LT1114CN
J PACKAGE N PACKAGE 14-LEAD CERAMIC DIP 14-LEAD PLASTIC DIP
TJMAX = 160C, JA = 80C/W (J) TJMAX = 140C, JA = 110C/W (N)
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
VOS VOS Time IOS IB en Input Offset Voltage Long Term Input Offset Voltage Stability Input Offset Current LT1114S Input Bias Current LT1114S Input Noise Voltage
VS = 15V, VCM = 0V, TA = 25C, unless otherwise noted. LT1112AM/AC LT1114AM/AC MIN TYP MAX
20 40 0.3 50 70 180 250 0.9 60 110
CONDITIONS (Note 2)
VS = 1.0V
0.1Hz to 10Hz (Note 9)
2
U
U
W
WW
U
W
TOP VIEW OUT A 1 -IN A 2 +IN A 3 V- 4 B 5 +IN B A 8 7 6 V+ OUT B -IN B
ORDER PART NUMBER LT1112S8 PART MARKING 1112 ORDER PART NUMBER LT1114S
S8 PACKAGE 8-LEAD PLASTIC SO
TJMAX = 140C, JA = 190C/W
TOP VIEW OUT A 1 -IN A 2 +IN A 3 V+ 4 +IN B 5 -IN B 6 OUT B 7 NC 8 B C A D 16 OUT D 15 -IN D 14 +IN D 13 V - 12 +IN C 11 -IN C 10 OUT C 9 NC
S PACKAGE 16-LEAD PLASTIC SO (NARROW) TJMAX = 140C, JA = 150C/W
LT1112M/C/S8 LT1114M/C/S MIN TYP MAX
25 45 0.3 60 75 80 100 0.3 230 330 280 450 0.9 75 130
UNITS
V V V/Mo pA pA pA pA VP-P
0.3
LT1112/LT1114
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
Input Noise Voltage Density in Input Noise Current Input Noise Current Density VCM CMRR PSRR RIN Input Voltage Range Common-Mode Rejection Ratio Power Supply Rejection Ratio Minimum Supply Voltage Input Resistance Differential Mode Common Mode Large-Signal Voltage Gain Output Voltage Swing Slew Rate Gain-Bandwidth Product Supply Current per Amplifier VS = 1.0V Channel Separation VOS IB
+
VS = 15V, VCM = 0V, TA = 25C, unless otherwise noted. LT1112AM/AC LT1114AM/AC MIN TYP MAX
16 14 2.2 0.030 0.008 13.5 14.3 136 126 13.5 115 114 1.0 50 800 5000 1500 14.0 12.4 0.30 750 350 320 150 35 100 100 450 113 112 400 370 15 800 600 13.0 11.0 0.16 450 40 700 5000 1300 14.0 12.4 0.30 750 350 320 150 40 100 120 136 130 130 500 680 450 420 120 116 1.0 20 1000 800 13.0 11.0 0.16 450 28 18
CONDITIONS (Note 2)
fO = 10Hz (Note 9) fO = 1000Hz (Note 9) 0.1Hz to 10Hz fO = 10Hz fO = 1000Hz VCM = 13.5V VS = 1.0V to 20V (Note 4) (Note 3) VO = 12V, RL = 10k VO = 10V, RL = 2k RL = 10k RL = 2k fO = 10kHz
LT1112M/C/S8 LT1114M/C/S MIN TYP MAX
16 14 2.2 0.030 0.008 14.3 136 126 28 18
UNITS
nV/Hz nV/Hz pAP-P pA/Hz pA/Hz V dB dB V M G V/mV V/mV V V V/s kHz A A dB V pA pA dB dB
AVOL VOUT SR GBW IS
fO = 10Hz (Note 5) LT1114S (Notes 5, 7) (Notes 5, 7) 117 114
Offset Voltage Match Noninverting Bias Current Match (Notes 5, 6) Common-Mode Rejection Match Power Supply Rejection Match
CMRR PSRR
136 130
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
VOS VOS Temp IOS IB VCM CMRR PSRR AVOL 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 VCM = 13.5V VS = 1.2V to 20V
VS = 15V, - 55C TA 125C, unless otherwise noted. LT1112AMJ8 LT1114AMJ MIN TYP MAX
q q q q q q q q q q
CONDITIONS (Note 2)
VS = 1.2V (Note 8)
LT1112MJ8 LT1114MJ MIN TYP MAX
45 70 0.20 100 170 13.5 111 110 400 170 14.1 130 124 2500 500 150 260 0.75 500 700
UNITS
V V V/C pA pA V dB dB V/mV V/mV
35 60 0.15 80 150 13.5 116 112 500 200 14.1 130 124 2500 600
120 220 0.5 400 600
VO = 12V, RL = 10k VO = 10V, RL = 2k
3
LT1112/LT1114
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
VOUT SR IS VOS IB+ CMRR PSRR Output Voltage Swing Slew Rate Supply Current per Amplifier Offset Voltage Match Offset Voltage Match Drift Noninverting Bias Current Match Common-Mode Rejection Ratio Power Supply Rejection Ratio (Note 5) (Notes 5, 8) (Notes 5, 6) (Notes 5, 7) (Notes 5, 7)
VS = 15V, - 55C TA 125C, unless otherwise noted. LT1112AMJ8 LT1114AMJ MIN TYP MAX
q q q q q q q q
CONDITIONS (Note 2)
RL = 10k
LT1112MJ8 LT1114MJ MIN TYP MAX
13.0 13.85 0.12 0.22 380 70 0.3 170 106 106 130 126 530 240 1.0 850
UNITS
V V/s A V V/C pA dB dB
13.0 13.85 0.12 0.22 380 55 0.2 150 112 109 130 126 460 200 0.7 750
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
VOS VOS Temp IOS IB VCM CMRR PSRR AVOL VOUT SR IS VOS Input Offset Voltage
VS = 15V, 0C TA 70C, unless otherwise noted. LT1112ACN8 LT1114ACN MIN TYP MAX
q q q q q q q q q q
CONDITIONS (Note 2)
LT1112N8 LT1112S8, LT1114N/S VS = 1.2V LT1112N8 LT1112S8, LT1114N/S LT1114S
LT1112N8/S8 LT1114CN/S MIN TYP MAX
30 45 65 0.2 0.4 70 90 90 115 13.5 113 112 650 400 13.0 0.14 14.2 133 125 4000 1000 13.9 0.27 370 55 70 0.3 0.5 135 160 109 108 134 128 500 210 270 1.0 1.9 620 880 125 150 210 0.75 1.3 290 420 350 550
UNITS
V V V V/C V/C pA pA pA pA V dB dB V/mV V/mV V V/s A V V V/C V/C pA pA dB dB
27 35 50 0.15 0.3 60 80 13.5 118 114 800 500 13.0 0.14 14.2 133 125 4000 1300 13.9 0.27 370 45 55 0.2 0.4 120 114 110 134 128
100 125 175 0.5 1.1 220 300
Average Input Offset Voltage Drift (Note 8) Input Offset Current Input Bias Current
LT1114S Input Voltage Range Common-Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Output Voltage Swing Slew Rate Supply Current per Amplifier Offset Voltage Match (Note 5) Offset Voltage Match Drift (Notes 5, 8) IB+ CMRR PSRR Noninverting Bias Current Match (Notes 5, 6) Common-Mode Rejection Ratio Power Supply Rejection Ratio LT1112N8 LT1112S8, LT1114N/S LT1112N8 LT1112S8, LT1114N/S LT1114S (Notes 5, 7) (Notes 5, 7) VCM = 13.5V VS = 1.2V to 20V VO = 12V, RL = 10k VO = 10V, RL = 2k RL = 10k
q q q q q q q q q q q q q q q
440 170 220 0.7 1.6 530
4
LT1112/LT1114
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
VOS VOS Temp IOS IB VCM CMRR PSRR AVOL VOUT SR IS VOS Input Offset Voltage
VS = 15V, - 40C TA 85C, (Note 10) LT1112ACN8 LT1114ACN MIN TYP MAX
q q q q q q q q q q
CONDITIONS (Note 2)
LT1112N8 LT1112S8, LT1114N/S VS = 1.2V LT1112N8 LT1112S8, LT1114N/S LT1114S
LT1112N8/S8 LT1114CN/S MIN TYP MAX
35 45 60 0.20 0.40 85 110 120 150 13.5 112 111 600 300 0.13 14.1 132 125 3300 900 0.24 370 60 70 0.3 0.5 155 190 109 107 133 127 510 225 270 1.0 1.9 770 1300 135 160 240 0.75 1.30 400 600 550 800
UNITS
V V V V/C V/C pA pA pA pA V dB dB V/mV V/mV V V/s A V V V/C V/C pA pA dB dB
30 40 55 0.15 0.30 70 110 13.5 117 113 700 400 0.13 14.1 132 125 3300 1100 0.24 370 50 60 0.2 0.4 140 113 110 133 127
110 135 200 0.50 1.10 330 500
Average Input Offset Voltage Drift Input Offset Current Input Bias Current
LT1114S Input Voltage Range Common-Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Output Voltage Swing Slew Rate Supply Current per Amplifier Offset Voltage Match (Note 5) Offset Voltage Match Drift (Notes 5) IB+ CMRR PSRR Noninverting Bias Current Match (Notes 5, 6) Common-Mode Rejection Ratio Power Supply Rejection Ratio LT1112N8 LT1112S8, LT1114N/S LT1112N8 LT1112S8, LT1114N/S LT1114S (Notes 5, 7) (Notes 5, 7) VCM = 13.5V VS = 1.2V to 20V VO = 12V, RL = 10k VO = 10V, RL = 2k RL = 10k
q q q q q q q q q q q q q q q
13.0 13.85 450 180 230 0.7 1.6 660
13.0 13.85
The q denotes specifications which apply over the operating temperature range. Note 1: Differential input voltages greater than 1V will cause excessive current to flow through the input protection diodes unless limiting resistance is used. Note 2: 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 3: This parameter is guaranteed by design and is not tested. Note 4: Offset voltage, supply current and power supply rejection ratio are measured at the minimum supply voltage. Note 5: 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 6: This parameter is the difference between two noninverting input bias currents. Note 7: CMRR and PSRR are defined as follows: (1) CMRR and PSRR are measured in V/V on the individual amplifiers. (2) The difference is calculated between the matching sides in V/V. (3) The result is converted to dB. Note 8: This parameter is not 100% tested. Note 9: 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 10: The LT1112/LT1114 are not tested and are not quality assurance sampled at - 40C and at 85C. These specifications are guaranteed by design, correlation and/or inference from - 55C, 0C, 25C, 70C and/or 125C tests.
5
LT1112/LT1114
TYPICAL PERFOR A CE CHARACTERISTICS
Input Bias and Offset Current, Noninverting Bias Current Match vs Temperature
INPUT BIAS, OFFSET, MATCH CURRENT (pA) 200 IB+ IOS 0 IB (UNDERCANCELLED)
100
INPUT BIAS CURRENT (pA)
50 0 -50
PERCENT OF UNITS
-100
-100
-200 -75 -50 -25 0 25 50 75 TEMPERATURE (C) VS = 15V
VCM
100 125
-150 -15
10 -5 0 5 -10 COMMON-MODE INPUT VOLTAGE (V)
LT1112/14 * TPC01
Drift with Temperature LT1112N8/J8, LT1114J
20 850 OP AMPS TESTED 100 LT1112J8 165 LT1112N8 80 LT1114J VS = 15V
Drift with Temperature LT1112S8, LT1114N/S
25 960 OP AMPS TESTED 240 LT1112S8 80 LT1114N 40 LT1114S VS = 15V 30
20
PERCENT OF INPUTS
PERCENT OF UNITS
15
PERCENT OF UNITS
15
10
10
5
5
0 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 OFFSET VOLTAGE DRIFT WITH TEMPERATURE (V/C)
LT1112/14 * TPC04
0 0.6 1.0 1.4 -1.4 -1.0 -0.6 -0.2 0.2 OFFSET VOLTAGE DRIFT WITH TEMPERATURE (V/C)
LT1112/14 * TPC05
Distribution of Offset Voltage Match
25 VS = 15V TA = 25C 20 PERCENT ON UNITS
PERCENT OF UNITS
Distribution of Offset Voltage Match Drift (LT1112J8, LT1112N8, LT1114J Packages)
30 25 20 15 10 5 0 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 OFFSET VOLTAGE MATCH DRIFT (V/C)
LT1112/14 * TPC08
VS = 15V 342 PAIRS TESTED 15
PERCENT OF UNITS
15
10
5
0 -100 -80 -60 - 40 -20 0 20 40 60 80 100 VOS, OFFSET VOLTAGE MATCH (V)
LT1112/14 * TPC07
6
+
IB
-
IB (OVERCANCELLED)
UW
Input Bias Current Over Common-Mode Range
150 100 VS = 15V TA = 25C RINCM = 800G DEVICE WITH POSITIVE INPUT CURRENT DEVICE WITH NEGATIVE INPUT CURRENT
20 30
Distribution of Input Bias Current (In All Packages Except LT1114S)
VS = 15V TA = 25C
10
15
0 0 100 200 -300 -200 -100 INPUT BIAS CURRENT (pA)
300
LT1112/14 * TPC02
LT1112/14 * TPC03
Distribution of Offset Voltage at VS = 1.0V (In All Packages)
TA = 25C 25 20 15 10 5 0 -80 -60 -40 -20 0 20 40 60 80 100 INPUT OFFSET VOLTAGE (V)
LT1112/14 * TPC06
Distribution of Offset Voltage Match Drift (LT1112S8, LT1114N, LT1114S Packages)
20 VS = 15V 364 PAIRS TESTED
10
5
0 -1.6 -1.2 -0.8 -0.4 0 0.4 0.8 1.2 1.6 OFFSET VOLTAGE MATCH DRIFT (V/C)
LT1112/14 * TPC09
LT1112/LT1114
TYPICAL PERFOR A CE CHARACTERISTICS
Noise Spectrum
1000
VOLTAGE NOISE DENSITY (nV/Hz) CURRENT NOISE DENSITY (fA/Hz)
VS = 1V TO 20V TA = 25C
NOISE VOLTAGE (0.2V/DIV)
100
CURRENT NOISE
VOLTAGE NOISE 10 1/fCORNER 2.5Hz
1/fCORNER 140Hz 10 100 FREQUENCY (Hz) 1000
LT1112/14 * TPC10
1 1
0
2
6 4 TIME (SEC)
NOISE VOLTAGE (0.2V/DIV)
Warm-Up Drift
3
CHANGE IN OFFSET VOLTAGE (V)
CHANGE IN OFFSET VOLTAGE (V)
2A
4 2 0 -2 -4 -6
SUPPLY CURRENT PER AMPLIFIER (A)
VS = 15V TA = 25C
2 LT1112S8, LT1114N/S PACKAGES
1
LT1114J PACKAGE LT1112J8, N8 PACKAGES
0 0 0.5 1.0 1.5 2.0 TIME AFTER POWER ON (MINUTES) 2.5
MINIMUM SUPPLY (V)
Minimum Supply Voltage vs Temp Voltage Gain at Minimum Supply Voltage
COMMON-MODE RANGE OR OUTPUT SWING (V)
1.2 1.1 1.0 0.9
V + - 0.8 V + - 1.0 V - + 0.8 V - + 0.6 V - + 0.4 V - + 0.2 V- -75
OUTPUT SWING (V)
VOLTAGE GAIN (V/mV)
100 80 60 40
-50 -25
50 25 0 75 TEMPERATURE (C)
UW
LT1112/14 * TPC13
0.1Hz to 10Hz Noise
VS = 15V TA = 25C
0.01Hz to 1Hz Noise
VS = 15V TA = 25C
8
10
0
20
60 40 TIME (SEC)
80
100
LT1112/14 * TPC11
LT1112/14 * TPC12
Long Term Stability of Three Representative Units
6 VS = 15V TA = 25C
600
Supply Current per Amplifier vs Supply Voltage
500
3A 2B 1A 3B 1B
400
TA = 125C TA = 25C TA = -55C
300
0
1
2 3 4 TIME (MONTHS)
5
6
200
0
10 15 5 SUPPLY VOLTAGE (V)
20
LT1112/14 * TPC14
LT1112/14 * TPC15
Common-Mode Range and Voltage Swing with Respect to Supply Voltages
V+ V + - 0.2 V + - 0.4 V + - 0.6 SWING CM RANGE VS = 1V TO 20V IL < 100A
V+ V+ - 1 V+ - 2 V+ - 3 V- + 3 V- + 2 V- + 1
Output Voltage Swing vs Load Current
VS = 1V TO 20V TA = 25C MAX IL AT 1V = 1.3mA AT 1.5V = 3mA
SWING CM RANGE
100
125
-25 25 75 TEMPERATURE (C)
125
V- -9 -6 SINK 6 SOURCE OUTPUT CURRENT (mA) -3 0 3 9
LT1112/14 * TPC16
LT1112/14 * TPC17
LT1112/14 * TPC18
7
LT1112/LT1114
TYPICAL PERFOR A CE CHARACTERISTICS
Voltage Gain
-15 VS = 15V TA = 25C VOLTAGE GAIN (dB)
CHANGE IN OFFSET VOLTAGE (V)
-10 -5
RL = 10k 0 RL = 2k 5 10
GAIN (dB)
15 -15
-10
-5 0 5 OUTPUT VOLTAGE (V)
Common-Mode Rejection vs Frequency
140 140
COMMON-MODE REJECTION RATIO (dB)
120 100 80 60 40 20 0 1 10 10k 1k 100 FREQUENCY (Hz)
POWER SUPPLY REJECTION RATIO (dB)
VS = 15V TA = 25C
NEGATIVE SUPPLY
CHANNEL SEPARATION (dB)
Slew Rate, Gain-Bandwidth Product and Phase Margin vs Temperature
GAIN-BANDWIDTH PRODUCT (kHz) SLEW RATE (V/s)
0.4 SLEW 80 0.2
OUTPUT IMPEDANCE ()
0.3
m
AV = 100 1 0.1 0.01
AV = +1
70
OVERSHOOT (%)
800 GBW 700 60
600 -50 -25
50 25 0 75 TEMPERATURE (C)
8
UW
10 15
LT1112/14 * TPC19
Voltage Gain vs Frequency
140 120 100 VS = 15V TA = 25C
30 40
Gain, Phase Shift vs Frequency
100 VS = 15V TA = 25C 120
PHASE SHIFT (DEG)
PHASE
80 60 40 20 0 -20 0.01 0.1 1 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
LT1112/14 * TPC20
20 GAIN 10
140
160
0
PHASE MARGIN = 70C
180
-10 0.01
200 0.1 1 10
LT1112/14 * TPC21
FREQUENCY (MHz)
Power Supply Rejection vs Frequency
160
VS = 15V TA = 25C
Channel Separation vs Frequency
VS = 15V TA = 25C 140
120 100 80 POSITIVE SUPPLY 60 40
120
100 AMP 1 IN UNITY-GAIN 20VP-P, RL = 2k AMP 2 IN GAIN = 1000 RS = 100, RF = 100k 1 10 1k 100 10k FREQUENCY (Hz) 100k 1M
80
20 0.1 1 10 100 1k 10k FREQUENCY (Hz) 100k 1M
100k
1M
LT1112/14 * TPC22
LT1112/14 * TPC23
LT1112/14 * TPC24
Closed-Loop Output Impedance
1000 100
PHASE MARGIN (DEG) 120
Capacitive Loading Handling
VS = 15V TA = 25C
VS = 15V TA = 25C
100 80 60
10
AV = +1 40 AV = 10 20 0 0.1 0.00001 0.0001 0.001 0.01 CAPACITIVE LOAD (F)
100
125
0.001
1
10
100 1k 10k FREQUENCY (Hz)
100k
1M
1
10
LT1112/14 * TPC25
LT1112/14 * TPC26
LT1112/14 * TPC27
LT1112/LT1114
TYPICAL PERFOR A CE CHARACTERISTICS
Small-Signal Transient Response Large-Signal Transient Response
28
PEAK-TO-PEAK OUTPUT VOLTAGE (V)
20mV/DIV
5V/DIV
2s/DIV AV = +1 CL = 500pF VS = 15V AV = +1 RF = 10k CF = 100pF VS = 15V
APPLICATI
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. 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. 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. The inputs of the LT1112/1114 are protected with back-toback diodes. In the voltage follower configuration, when
Voltage Follower with Input Exceeding the Common-Mode Range (VS = 5V)
INPUT: 5.2V Sine Wave
U
W
UW
Undistorted Output Voltage vs Frequency
TA = 25C RL = 10k VS = 15V 20 16 12 8 4 0 1 10 100 FREQUENCY (kHz) 1000
LT1112/14 * TPC30
24
VS = 5V
50s/DIV
U
UO
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 use of a feedback resistor is recommended because this resistor keeps the current below the short-circuit limit, resulting in faster recovery and settling of the output. The input voltage of the LT1112/1114 should never exceed 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 output clips cleanly, without any glitches or phase reversal. The OP297 exhibits phase reversal. The photos also illustrate that both the input and output ranges of the LT1112 are within
LT1112 Output
OP-297 Output
9
LT1112/LT1114
APPLICATI S I FOR ATIO U
Input offset current = 100pA Input resistance = 800G Input noise = 0.42VP-P
Three Op Amp Instrumentation Amplifier
IN-
1/2 LT1112 OR 1/4 LT1114 -A
800mV of the supplies. The effect of input and output overdrive on the other amplifiers in the LT1112 or LT1114 packages is negligible, as each amplifier is biased independently. Advantages of Matched Dual and Quad Op Amps In many applications the performance of a system depends on the matching between two operational amplifiers 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. The well-known triple op amp configuration illustrates these concepts. Output offset is a function of the difference between the offsets of the two halves of the LT1112. This error cancellation principle holds for a considerable number 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 (IB+). The difference between these two currents (IB+) is the offset current of the instrumentation amplifier. Common-mode and power supply rejections will be dependent only on the match between the two amplifiers (assuming perfect resistor matching). The concepts of common-mode and power supply rejection ratio match (CMRR and PSRR) are best demonstrated 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 guaranteeing all of these matching parameters, can significantly improve the performance of matching-dependent circuits. Typical performance of the instrumentation amplifier: Input offset voltage = 35V Offset voltage drift = 0.3V/C Input bias current = 80pA
R8 200 R2 R5 10k 100 1% 0.5%
IN+
1/2 LT1112 OR 1/4 LT1114 D
R7 9.88k 0.5% R9 200
When the instrumentation amplifier is used with high impedance sources, the LT1114 is recommended because its CMRR vs frequency performance is better than the LT1112's. For example, with two matched 1M source resistors, CMRR at 100Hz is 100dB with the LT1114, 76dB with the LT1112. This difference is explained by the fact that capacitance between adjacent pins on an IC package is about 0.25pF (including package, socket and PC board trace capacitances). 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 x 109 input impedance mismatch, which is only 76dB higher than the 1M source resistors. On the quad package, all four inputs are adjacent to a power supply terminal-therefore, there is no mismatch.
10
+
C1 33pF
R10 1M
LT1097 OR 1/4LT1114 B OR C
-
+
-
W
U
UO
+
R4 100 0.5% R1 10k 1% R3 2.1k 1%
R6 10k 0.5%
OUTPUT
GAIN = 1000 TRIM R8 FOR GAIN TRIM R9 FOR DC COMMON-MODE REJECTION TRIM R10 FOR AC COMMON-MODE REJECTION
LT1112/14 * AI02
LT1112/LT1114
TYPICAL APPLICATI
Dual Buffered 0.617V Reference Powered by Two AA Batteries
+1.5V 15k RX*
LT1004-1.2 100pF
1/2 LT1112 RY* *OPTIONAL -1.5V
SCHE ATIC DIAGRA
12pF 30k Q35 Q34 30k
(1/2 LT1112, 1/4 LT1114)
V+ 20A 35A Q19 1.5k Q21 Q33 Q25 S Q27 Q29 Q24 28 3k Q11 Q23 2.5k Q20 Q26 Q28 Q32 90 30 OUT 80A Q22
800
30pF
4k
Q5
Q6 Q8 Q7 Q13 Q4
INVERTING INPUT
S Q1 Q2
S S Q3 50k 1.5k Q12 J1 Q16 10k Q18 460 15A 5A 5A V- 460 460 Q14 Q15 200 Q17 Q30
-
Q9 NONINVERTING INPUT
Q10
+
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 representation that the interconnection of circuits as described herein will not infringe on existing patent rights.
-
+
W
UO
+
1/2 LT1112 *OPTIONAL +0.617V
-
20k 0.1% TOTAL SUPPLY CURRENT = 700A WORKS WITH BATTERIES DISCHARGED TO 1.3V AT 1.5V: MAXIMUM LOAD CURRENT = 800A; CAN BE INCREASED WITH OPTIONAL RX, RY; AT RX = RY = 750 LOAD CURRENT = 2mA TEMPERATURE COEFFICIENT LIMITED BY REFERENCE = 20ppm/C
20k 0.1%
-0.617V
LT1112/14 * TA03
W
Q31
200
Q1 TO Q4 ARE SUPERGAIN TRANSISTORS
LT1112/14 * SD01
11
LT1112/LT1114
PACKAGE DESCRIPTIO
0.290 - 0.320 (7.366 - 8.128)
J8 Package 8-Lead Ceramic DIP
0.008 - 0.018 (0.203 - 0.460) 0.385 0.025 (9.779 0.635) 0 - 15
0.300 - 0.320 (7.620 - 8.128)
N8 Package 8-Lead Plastic DIP
0.009 - 0.015 (0.229 - 0.381) +0.025 0.325 -0.015 8.255 +0.635 -0.381
(
)
0.010 - 0.020 x 45 (0.254 - 0.508)
S8 Package 8-Lead Plastic SOIC
0- 8 TYP 0.016 - 0.050 0.406 - 1.270
0.008 - 0.010 (0.203 - 0.254)
0.290 - 0.320 (7.366 - 8.128)
J Package 14-Lead Ceramic DIP
0.008 - 0.018 (0.203 - 0.460) 0.385 0.025 (9.779 0.635) 0 - 15
0.300 - 0.325 (7.620 - 8.255)
N Package 14-Lead Plastic DIP
0.009 - 0.015 (0.229 - 0.381) +0.025 0.325 -0.015 8.255 +0.635 -0.381
(
)
S Package 16-Lead Plastic SOIC
0 - 8 TYP
0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254)
0.016 - 0.050 0.406 - 1.270
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900 q FAX: (408) 434-0507 q TELEX: 499-3977
U
Dimensions in inches (millimeters) unless otherwise noted.
0.200 (5.080) MAX 0.015 - 0.060 (0.381 - 1.524) 0.005 (0.127) MIN 0.405 (10.287) MAX 8 7 6 5
0.025 (0.635) RAD TYP 1 2 3
0.220 - 0.310 (5.588 - 7.874)
4
0.038 - 0.068 (0.965 - 1.727) 0.014 - 0.026 (0.360 - 0.660)
0.125 3.175 0.100 0.010 MIN (2.540 0.254)
0.055 (1.397) MAX
0.045 - 0.065 (1.143 - 1.651)
0.130 0.005 (3.302 0.127)
0.400 (10.160) MAX 8 7 6 5
0.065 (1.651) TYP 0.125 (3.175) MIN 0.020 (0.508) MIN
0.250 0.010 (6.350 0.254)
0.045 0.015 (1.143 0.381) 0.100 0.010 (2.540 0.254)
1
2
3
4
0.018 0.003 (0.457 0.076)
0.189 - 0.197 (4.801 - 5.004)
0.053 - 0.069 (1.346 - 1.752) 0.004 - 0.010 (0.101 - 0.254) 0.228 - 0.244 (5.791 - 6.197)
8
7
6
5
0.014 - 0.019 (0.355 - 0.483)
0.050 (1.270) BSC
0.150 - 0.157 (3.810 - 3.988)
1
2
3
4
0.200 (5.080) MAX 0.015 - 0.060 (0.381 - 1.524)
0.005 (0.127) MIN
0.785 (19.939) MAX 14 13 12 11 10 9 8
0.025 (0.635) RAD TYP
0.220 - 0.310 (5.588 - 7.874)
1 0.038 - 0.068 (0.965 - 1.727) 0.014 - 0.026 (0.360 - 0.660) 0.100 0.010 (2.540 0.254) 0.125 (3.175) MIN 0.098 (2.489) MAX
2
3
4
5
6
7
0.015 (0.380) MIN 0.130 0.005 (3.302 0.127)
0.045 - 0.065 (1.143 - 1.651)
0.065 (1.651) TYP 14 13 12
0.770 (19.558) MAX 11 10 9 8
0.260 0.010 (6.604 0.254)
0.075 0.015 (1.905 0.381)
0.018 0.003 (0.457 0.076) 0.100 0.010 (2.540 0.254)
0.125 (3.175) MIN
1
2
3
4
5
6
7
0.386 - 0.394 (9.804 - 10.008) 0.053 - 0.069 (1.346 - 1.752) 0.004 - 0.010 (0.101 - 0.254) 16 15 14 13 12 11 10 9
0.014 - 0.019 (0.355 - 0.483)
0.050 (1.270) TYP
0.228 - 0.244 (5.791 - 6.197)
0.150 - 0.157 (3.810 - 3.988)
1
2
3
4
5
6
7
8
LT/GP 1292 10K REV 0
(c) LINEAR TECHNOLOGY CORPORATION 1992

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