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LT1012A/LT1012 Picoamp Input Current, Microvolt Offset, Low Noise Op Amp DESCRIPTIO
The LT (R)1012 is an internally compensated universal precision operational amplifier which can be used in practically all precision applications. The LT1012 combines picoampere bias currents (which are maintained over the full -55C to 125C temperature range), microvolt offset voltage (and low drift with time and temperature), low voltage and current noise, and low power dissipation. The LT1012 achieves precision operation on two Ni-Cad batteries with 1mW of power dissipation. Extremely high common mode and power supply rejection ratios, practically unmeasurable warm-up drift, and the ability to deliver 5mA load current with a voltage gain of one million round out the LT1012's superb precision specifications. The all around excellence of the LT1012 eliminates the necessity of the time consuming error analysis procedure of precision system design in many applications; the LT1012 can be stocked as the universal internally compensated precision op amp.
, LTC and LT are registered trademarks of Linear Technology Corporation. Protected by U. S. patents 4,575,685 and 4,775,884
FEATURES
s
s s s s s s s s
OP-07 Type Performance: at 1/8th of OP-07's Supply Current at 1/20th of OP-07's Bias and Offset Currents Guaranteed Offset Voltage: 25V Max Guaranteed Bias Current: 100pA Max Guaranteed Drift: 0.6V/C Max Low Noise, 0.1Hz to 10Hz: 0.5VP-P Guaranteed Low Supply Current: 500A Max Guaranteed CMRR: 114dB Min Guaranteed PSRR: 114dB Min Guaranteed Operation at 1.2V Supplies
APPLICATIO S
s s s s s s s
Replaces OP-07 While Saving Power Precision Instrumentation Charge Integrators Wide Dynamic Range Logarithmic Amplifiers Light Meters Low Frequency Active Filters Thermocouple Amplifiers
TYPICAL APPLICATIO
R1 1M -IN 3 R2 20k 2 R3 1M +IN 7 6 4 R5 975k
250V Common Mode Range Instrumentation Amplifier (AV = 1)
200
Typical Distribution of Input Offset Voltage
1140 UNITS FROM THREE RUNS VS = 15V TA = 25C VCM = 0V
1 6V TO 18V R6 25k 2 6 LT1012 3 OUT R1 TO R6: VISHAY 444 ACCUTRACT THIN FILM SIP NETWORK X : VISHAY 444 PIN NUMBERS VISHAY INTERTECHNOLOGY, INC 63 LINCOLN HIGHWAY MALVERN, PA 19355 50k OPTIONAL CMRR TRIM
160
- +
7
NUMBER OF UNITS
120
COMMON MODE INPUT 250V
4
80
5
R4 19.608k - 6V TO -18V
40
0
-40
COMMON MODE REJECTION RATIO = 74dB (RESISTOR LIMITED) WITH OPTIONAL TRIM = 130dB OUTPUT OFFSET (TRIMMABLE TO ZERO) = 500V OUTPUT OFFSET DRIFT = 10V/C INPUT RESISTANCE = 1M LT1012A * TA01
U
U
U
20 40 -20 0 INPUT OFFSET VOLTAGE (V)
LT1012A * TA02
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LT1012A/LT1012
ABSOLUTE
AXI U
RATI GS
Supply Voltage ...................................................... 20V Differential Input Current (Note 1) ...................... 10mA Input Voltage ......................................................... 20V Output Short Circuit Duration .......................... Indefinite
PACKAGE/ORDER I FOR ATIO
TOP VIEW VOS TRIM -IN +IN V- 1 2 3 4 - + 8 7 6 5 VOS TRIM V+ OUT OVER COMP
VOS TRIM 1 -IN 2 +IN 3
S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 100C, JA = 170C/W
H PACKAGE 8-LEAD TO-5 METAL CAN TJMAX = 150C, JA = 150C/W, JC = 45C/W
ORDER PART NUMBER LT1012S8 LT1012IS8 LT1012ACS8 LT1012AIS8 S8 PART MARKING 1012 1012I 1012A 1012AI
ORDER PART NUMBER LT1012AMH LT1012MH LT1012ACH LT1012CH LT1012DH
OBSOLETE PACKAGE
Consider the S8 or N8 Packages for Alternate Source
Consult LTC Marketing for parts specified with wider operating temperature ranges.
2
U
U
W
WW U
W
(Note 1)
Operating Temperature Range LT1012AM/LT1012M (OBSOLETE)....- 55C to 125C LT1012I/LT1012AI ............................. - 40C to 85C LT1012AC/LT1012C LT1012D/LT1012S8 ................................ 0C to 70C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
TOP VIEW VOS TRIM 8 - + 4 TOP VIEW 7V
+
VOS TRIM -IN +IN V-
1 2 3 4 N8 PACKAGE 8-LEAD PDIP - +
8 7 6 5
VOS TRIM V+ OUT OVER COMP
6 OUT
5 OVER COMP - (CASE) V
TJMAX = 100C, JA = 130C/W
ORDER PART NUMBER LT1012ACN8 LT1012AIN8 LT1012CN8 LT1012DN8 LT1012IN8
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LT1012A/LT1012
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER VOS Input Offset Voltage (Note 3) Long Term lnput Offset Voltage Stability IOS IB en en in AVOL CMRR PSRR Input Offset Current (Note 3) Input Bias Current (Note 3) Input Noise Voltage Input Noise Voltage Density Input Noise Current Density Large Signal Voltage Gain Common Mode Rejection Ratio 0.1Hz to 10Hz fO = 10Hz (Note 4) fO = 1000Hz (Note 5) fO = 10Hz VOUT = 12V, RL 10k VOUT = 10V, RL 2k VCM = 13.5V CONDITIONS
VS = 15V, VCM = OV, TA = 25C, unless otherwise noted.
LT1O12AM/AC/AI MIN TYP MAX 8 20 0.3 15 25 25 35 0.5 17 14 20 300 300 114 114 13.5 13 0.1 2000 1000 132 132 14 14 0.2 370 380 500 600 300 200 114 114 13.5 13 0.1 30 22 100 150 100 150 25 90 MIN LT1O12M/I TYP MAX 8 20 0.3 15 25 25 35 0.5 17 14 20 2000 1000 132 132 14 14 0.2 380 380 600 200 200 110 110 13.5 13 0.1 30 22 100 150 100 150 35 90 MIN LT1O12C TYP MAX 10 25 0.3 20 30 30 40 0.5 17 14 20 2000 1000 132 132 14 14 0.2 380 380 600 30 22 150 200 150 200 50 120 UNITS V V V/month pA pA pA pA VP-P nVHz nVHz fA/Hz V/mV V/mV dB dB V V V/s A A
Power SuppIy Rejection Ratio VS = 1.2V to 20V Input Voltage Range
VOUT
Output Voltage Swing Slew Rate
RL = 10k
IS
Supply Current (Note 3)
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LT1012A/LT1012
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER VOS Input Offset Voltage (Note 3) Long Term Input Offset Voltage Stability lOS IB en en in AVOL CMRR PSRR Input Offset Current (Note 3) Input Bias Current (Note 3) Input Noise Voltage Input Noise Voltage Density lnput Noise Current Density Large-Signal Voltage Gain 0.1Hz to 10Hz fO = 10Hz (Note 5) fO = 1000Hz (Note 5) fO = 10Hz VOUT = 12V,RL 10k VOUT = 10V,RL 2k VS = 1.2V to 20V CONDITIONS
VS = 15V, VCM = 0V, TA = 25C, unless otherwise noted.
MIN LT1012D TYP 12 25 0.3 20 30 30 40 0.5 17 14 20 200 200 110 110 13.5 2000 1000 132 132 14.0 14 0.2 380 600 200 120 110 110 13.5 13 0.1 30 22 150 150 MAX 60 MIN LT1012S8 TYP 15 25 0.4 50 60 80 120 0.5 17 14 20 2000 1000 132 132 14.0 14 0.2 380 600 30 22 280 380 300 400 MAX 120 180 UNITS V V V/month pA pA pA pA VP-P nVHz nVHz fA/Hz V/mV V/mV dB dB V V V/s A
Common Mode Rejection Ratio VCM = 13.5V Power Supply Rejection Ratio Input Voltage Range
VOUT
Output Voltage Swing Slew Rate
RL = 10k
13 0.1
IS
Supply Current
(Note 3)
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LT1012A/LT1012
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER VOS Input Offset Voltage (Note 3) Average Temperature Coefficient of Input Offset Voltage IOS Input Offset Current (Note 3) Average Temperature Coefficient of Input Offset Current IB Input Bias Current (Note 3) Average Temperature Coefficient of Input Bias Current AVOL CMRR PSRR Large-Signal Voltage Gain Common Mode Rejection Ratio Power Supply Rejection Ratio Input Voltage Range VOUT IS Output Voltage Swing Supply Current RL = 10k
The q denotes the specifications which apply over the full operating temperature range of -55C TA 125C for LT1012AM and LT1012M, and -40C TA 85C for LT1012AI and LT1012I. VS = 15V, VCM = 0V, unless otherwise noted.
CONDITIONS
q q q
MIN
LT1012AM/AI TYP MAX 30 40 0.2 30 70 0.3 80 150 0.6 60 180 0.6 250 350 2.5 600 800 6.0
MIN
LT1012M/I TYP 30 40 0.2 30 70 0.3 80 150 0.6
MAX 180 250 1.5 250 350 2.5 600 800 6.0
UNITS V V V/C pA pA pA/C pA pA pA/C V/mV V/mV dB dB V
q q q
q q q
VOUT = 12V, RL 10k VOUT = 10V, RL 2k VCM = 13.5V VS = 1.5V to 20V
q q q q q q q
200 200 110 110 13.5 13
1000 600 128 126 14 400 650
150 100 108 108 13.5 13
1000 600 128 126 14 400 800
V A
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LT1012A/LT1012
The q denotes the specifications which apply over the full operating temperature range of 0C TA 70C. VS = 15V, VCM = 0V, unless otherwise noted.
SYMBOL PARAMETER VOS Input Offset Voltage (Note 3) Average Temperature Coefficient of Input Offset Voltage IOS Input Offset Current (Note 3) Average Temperature Coefficient of Input Offset Current IB Input Bias Current (Note 3) Average Temperature Coefficient of Input Bias Current AVOL CMRR PSRR Large-Signal Voltage Gain Common Mode Rejection Ratio Power Supply Rejection Ratio Input Voltage Range VOUT IS Output Voltage Swing Supply Current RL = 10k VOUT = 12V, RL 10k VOUT = 10V, RL 2k VCM = 13.5V VS = 1.3V to 20V CONDITIONS
q q q q q q q q q q q q q q q q
ELECTRICAL CHARACTERISTICS
MIN
LT1012AC TYP 20 30 0.2 25 40 0.3 35 50 0.3
MAX 60 160 0.6 230 300 2.5 230 300 2.5
MIN
LT1012C TYP 20 30 0.2 35 45 0.3 35 50 0.3
MAX 100 200 1.0 230 300 2.5 230 300 2.5
UNITS V V V/C pA pA pA/C pA pA pA/C V/mV V/mV dB dB V
200 200 110 110 13.5 13
1500 1000 130 128
150 150 108 108 13.5
1500 800 130 128
14 400 600
13
14 400 800
V A
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LT1012A/LT1012
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER VOS Input Offset Voltage (Note 3) Average Temperature Coefficient of Input Offset Voltage IOS Input Offset Current (Note 3) Average Temperature Coefficient of Input Offset Current IB Input Bias Current (Note 3) Average Temperature Coefficient of Input Bias Current AVOL CMRR PSRR Large-Signal Voltage Gain Common Mode Rejection Ratio Power Supply Rejection Ratio Input Voltage Range VOUT IS Output Voltage Swing Supply Current RL = 10k
The q denotes the specifications which apply over the full operating temperature range of 0C TA 70C. VS = 15V, VCM = 0V, unless otherwise noted.
CONDITIONS
q q q q q q q q q
MIN
LT1012D TYP 25 40 0.3 35 45 0.35 50 65 0.4
MAX 140 1.7 380 4.0 420 5.0
MIN
LT1012S8 TYP 30 45 0.3 60 80 0.4 100 150 0.5
MAX 200 270 1.8 380 500 4.0 420 550 5.0
UNITS V V V/C pA pA pA/C pA pA pA/C V/mV V/mV dB dB V
VOUT = 12V, RL 10k VOUT = 10V, RL 2k VCM = 13.5V VS = 1.3V to 20V
q q q q q q q
150 150 108 108 13.5 13
1500 800 130 128
150 100 108 108 13.5
1500 800 130 128
14 400 800
13
14 400 800
V A
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. 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 3: These specifications apply for VMIN VS 20V and -13.5V VCM 13.5V (for VS = 15V). VMIN = 1.2V at 25C, 1.3V from 0C to 70C, 1.5V from - 55C to 125C. Note 4: 10Hz noise voltage density is sample tested on every lot. Devices 100% tested at 10Hz are available on request. Note 5: This parameter is tested on a sample basis only.
V+ 5k TO 100k POT 1 2
Optional Offset Nulling and Overcompensation Circuits Input offset voltage can be adjusted over a 800V range with a 5k to 100k potentiometer.
-
LT1012
8
7 5
6
OUT
3
+
4 V-
CS
LT1012A * EC01
The LT1012 is internally compensated for unity gain stability. The overcompensation capacitor, CS, can be used to improve capacitive load handling capability, to narrow noise bandwidth, or to stabilize circuits with gain in the feedback loop.
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LT1012A/LT1012 TYPICAL PERFOR A CE CHARACTERISTICS
Offset Voltage vs Source Resistance (Balanced or Unbalanced)
1000 VS = 15V
INPUT OFFSET VOLTAGE (V)
100
NUMBER OF UNITS
- 55C TO 125C 25C
120
NUMBER OF UNITS
10
1 1k 3k 10k 30k 100k 300k 1M SOURCE RESISTANCE () 3M 10M
LT1012A * TPC01
100
60 40 UNDERCANCELLED UNIT
OFFSET VOLTAGE DRIFT WITH TEMPERATURE (V/ C)
Input Bias Current vs Temperature
INPUT BIAS CURRENT (pA)
INPUT BIAS CURRENT (pA)
50
0 OVERCANCELLED UNIT
-50
-100
-150 -50
-25
50 75 0 25 TEMPERATURE (C)
Warm-Up Drift
5
CHANGE IN OFFSET VOLTAGE (V) CHANGE IN OFFSET VOLTAGE (V)
VS = 15V TA = 25C
4
4 2 0 -2 -4 -6 -8
OFFSET VOLTAGE (V)
3
2
METAL CAN (H) PACKAGE DUAL-IN-LINE PACKAGE PLASTIC (N) OR SO (S)
1
0
0
1 3 4 2 TIME AFTER POWER ON (MINUTES)
8
UW
100
Typical Distribution of Input Bias Current
200 VS = 15V TA = 25C VCM = 0V 1020 UNITS FROM THREE RUNS 200
Typical Distribution of Input Offset Current
VS = 15V TA = 25C VCM = 0V 1020 UNITS FROM THREE RUNS
160
160
120
80
80
40
40
0
-120
60 - 60 0 INPUT BIAS CURRENT (pA)
120
0
-120
60 120 -60 0 INPUT OFFSET CURRENT (pA)
LT1012A * TPC03
LT1012A * TPC02
Input Bias Current Over Common Mode Range
VS = 15V TA = 25oC DEVICE WITH POSITIVE INPUT CURRENT RIN CM = 2 X 1012 DEVICE WITH NEGATIVE INPUT CURRENT IB VCM
Offset Voltage Drift vs Source Resistance (Balanced or Unbalanced)
100
20 0 -20 -40 -60 -15
10
- +
1.0
MAXIMUM
TYPICAL 0.1 1k 10k 100k 1M 10M SOURCE RESISTANCE () 100M
125
-10
-5
0
5
10
15
LT1012A * TPC04
COMMON MODE INPUT VOLTAGE
LT1012A * TPC5
LT1012 * TPC06
Long Term Stability of Four Representative Units
10 8 6 40 20 0 -20 -40 60
Offset Voltage Drift with Temperature of Four Representative Units
5
-10
0
1
3 2 TIME (MONTHS)
4
5
-60 -50 -25
50 25 75 0 TEMPERATURE (C)
100
125
LT1012A * TPC07
LT1012A * TPC08
LT1012A * TPC09
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LT1012A/LT1012 TYPICAL PERFOR A CE CHARACTERISTICS
0.1Hz to 10Hz Noise
1000 VOLTAGE NOISE DENSITY (nVHz) CURRENT NOISE DENSITY (fAHz)
TA = 25C VS = 1.2V TO 20V
NOISE VOLTAGE 400nV/DIVISION
TOTAL NOISE DENSITY (V/Hz)
0
2
6 4 TIME (SECONDS)
Supply Current vs Supply Voltage
500 COMMON MODE REJECTION RATIO (dB)
120 100 80 60 40 20 0 1 VS = 15V TA = 25C 10 10k 1k 100 FREQUENCY (Hz) 100k 1M
POWER SUPPLY REJECTION RATIO (dB)
SUPPLY CURRENT (A)
400 25C 125C -55C
300
0
10 15 5 SUPPLY VOLTAGE (V)
Voltage Gain vs Frequency
140 120 40
VOLTAGE GAIN (dB)
100
GAIN (dB)
80 60 40 20 0 VS = 15V TA = 25C 1 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz)
LT1012A * TPC16
VOLTAGE GAIN
-20 0.01 0.1
UW
8 10
LT1012A * TPC10
LT1012A * TPC13
Noise Spectrum
TA = 25C VS = 1.2 TO 20V
Total Noise vs Source Resistance
10.0 TA = 25C VS = 1.2V TO 20V AT 10Hz AT 1kHz
100 CURRENT NOISE VOLTAGE NOISE 10 1/f CORNER 2.5Hz 1/f CORNER 120Hz 1 1 10 100 FREQUENCY (Hz) 1000
LT1012A * TPC11
1.0
R
- +
R
RS = 2R
0.1 AT 10Hz AT 1kHz RESISTOR NOISE ONLY 0.01 102 103 104 105 106 107 SOURCE RESISTANCE () 108
LT1012A * TPC12
Common Mode Rejection vs Frequency
140
140 120 100
Power Supply Rejection vs Frequency
NEGATIVE SUPPLY 80 60 40 POSITIVE SUPPLY VS = 15V TA = 25C 1 10 100 1k 10k FREQUENCY (Hz) 100k 1M
20
20 0.1
LT1012A * TPC14
LT1012A * TPC15
Gain, Phase Shift vs Frequency
100
Voltage Gain vs Load Resistance
10M VS = 15V V0 = 10V 3M - 55C 25C 1M 125C
30
PHASE
120
PHASE SHIFT (DEGREES)
20 GAIN 10 PHASE MARGIN = 70C 0 VS = 15V TA = 25C 0.1 1 FREQUENCY (MHz) 10
LT1012A * TPC17
140
160
300k
180
-10 0.01
200
100k 1 2 5 10 LOAD RESISTANCE (k) 20
LT1012A * TPC18
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LT1012A/LT1012 TYPICAL PERFOR A CE CHARACTERISTICS
Small-Signal Transient Response Small-Signal Transient Response Large-Signal Transient Response
20mV/DIV
20mV/DIV
AV = +1 CLOAD = 100pF
5s/DIV
AV = +1 CLOAD = 1000pF
5s/DIV
2V/DIV
Output Short-Circuit Current vs Time
20
SHORT-CIRCUIT CURRENT (mA) SINKING SOURCING
1
-55C 15 25C 10
SLEW RATE (V/s)
GBW 0.1 SLEW 100
5 0 -5 -10 -15 -20 0
125C VS = 15V 125C 25C -55C
OUTPUT IMPEDANCE ()
2 1 TIME FROM OUTPUT SHORT (MINUTES)
Common Mode Range and Voltage Swing at Minimum Supply Voltage
COMMON MODE RANGE OR OUTPUT VOLTAGE (V)
V+ 1.8 V+ - 0.3 V
+ - 0.6
MINIMUM SUPPLY VOLTAGE (V)
V+ - 0.9 V+ - 1.2 V - + 1.2 V
- + 0.9
V - + 0.6 V- + 0.3 V- -50 -25 CM RANGE
0 25 75 50 TEMPERATURE (C)
10
UW
AV = +1
20s/DIV
Slew Rate, Gain Bandwidth Product vs Overcompensation Capacitor
1000
Closed-Loop Output Impedance
1000 100 10 AV = 1000 1 AV = +1 0.1 0.01 0.001 1 10 100 1 FREQUENCY (Hz) 10 100 I0 = 1mA VS = 15V TA = 25C
GAIN BANDWIDTH PRODUCT (kHz)
0.01
10
0.001
VS = 15V TA = 25C 1
3
1 10 100 1000 10,000 OVERCOMPENSATION CAPACITOR (pF)
LT1012A * TPC20
LT1012A * TPC19
LT1012A * TPC21
Minimum Supply Voltage, Voltage Gain at VMIN
1.6 1.4 1.2 1.0 0.8 RL = 10k RL = 2k 200k 300k 400k
CM RANGE
VOLTAGE GAIN AT MINIMUM SUPPLY VOLTAGE (V/V)
SWING R L = 2k SWING R L = 10k SWING R L = 2k
100k
100
125
-50 -25
50 25 0 75 TEMPERATURE (C)
100
0 125
LT1012A * TPC22
LT1012A * TPC23
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LT1012A/LT1012
APPLICATIO S I FOR ATIO
The LT1012 may be inserted directly into OP-07, LM11, 108A or 101A sockets with or without removal of external frequency compensation or nulling components. The LT1012 can also be used in 741, LF411, LF156 or OP-15 applications provided that the nulling circuitry is removed. Although the OP-97 is a copy of the LT1012, the LT1012 directly replaces and upgrades OP-97 applications. The LT1012C and D have lower offset voltage and drift than the OP-97F. The LT1012A has lower supply current than the OP-97A/E. In addition, all LT1012 grades guarantee operation at 1.2V supplies. Achieving Picoampere/Microvolt Performance In order to realize the picoampere/microvolt level accuracy of the LT1012, proper care must be exercised. For example, leakage currents in circuitry external to the op amp can significantly degrade performance. High quality insulation should be used (e.g. Teflon, Kel-F); cleaning of all insulating surfaces to remove fluxes and other residues will probably be required. Surface coating may be necessary to provide a moisture barrier in high humidity environments. Board leakage can be minimized by encircling the input circuitry with a guard ring operated at a potential close to that of the inputs: in inverting configurations the guard ring should be tied to ground, in non-inverting connections to the inverting input at Pin 2. Guarding both sides of the printed circuit board is required. Bulk leakage reduction depends on the guard ring width. Nanoampere level leakage into the offset trim terminals can affect offset voltage and drift with temperature.
OFFSET TRIM V+ OUTPUT 6 OVER COMP 5 4 3 2 7 8
1
V- GUARD
IN
PU
TS
LT1012A * AI01
U
Microvolt level error voltages can also be generated in the external circuitry. Thermocouple effects caused by temperature gradients across dissimilar metals at the contacts to the input terminals can exceed the inherent drift of the amplifier. Air currents over device leads should be minimized, package leads should be short, and the two input leads should be as close together as possible and maintained at the same temperature. Noise Testing For application information on noise testing and calculations, please see the LT1008 data sheet. Frequency Compensation The LT1012 can be overcompensated to improve capacitive load handling capability or to narrow noise bandwidth. In many applications, the feedback loop around the amplifier has gain (e.g. Iogarithmic amplifiers); overcompensation can stabilize these circuits with a single capacitor. The availability of the compensation terminal permits the use of feedforward frequency compensation to enhance slew rate. The voltage follower feedforward scheme bypasses the amplifier's gain stages and slews at nearly 10V/s. The inputs of the LT1012 are protected with back-to-back diodes. Current limiting resistors are not used, because the leakage of these resistors would prevent the realization of picoampere level bias currents at elevated temperatures. 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 use of a feedback resistor, as shown in the voltage follower feedforward diagram, is recommended because this resistor keeps the current below the short-circuit limit, resulting in faster recovery and settling of the output.
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LT1012A/LT1012
APPLICATIO S I FOR ATIO
Test Circuit for Offset Voltage and its Drift with Temperature
50k *
Follower Feedforward Compensation
50pF
15V
- +
5V/DIV
2 100* 3
7 LT1012 4 6 V0
50k*
5k
-15V V0 = 1000V0S
IN
*RESISTORS MUST HAVE LOW THERMOELECTRIC POTENTIAL
LT1012A * AI02
TYPICAL APPLICATIO S
Ampmeter with Six Decade Range
10k 15V Q3 R1 2k 1.2k 0.1F 100pA Q1 Q2 RANGE 1nA 2 549 LT1004C 549
10k CURRENT INPUT
10k
- +
LT1012 3 4 -15V
Q1, Q2, Q3, Q4, RCA CA3146 TRANSISTOR ARRAY. CALIBRATION: ADJUST R1 FOR FULL-SCALE DEFLECTION WITH 1A INPUT CURRENT AMPMETER MEASURES CURRENTS FROM 100pA TO 100A WITHOUT THE USE OF EXPENSIVE HIGH VALUE RESISTORS. ACCURACY AT 100A IS LIMITED BY THE OFFSET VOLTAGE BETWEEN Q1 AND Q2 AND, AT 100pA, BY THE INVERTING BIAS CURRENT OF THE LT1012
12
U
Pulse Response of Feedforward Compensation
10k
W
U
UU
Photoo
2
-
LT1012
6 5
OUT
3
+
0.01F
5s/DIV
LT1012A * AI03
100A METER
15V 7 6 33k
10nA 549 Q4 PIN 13 CA3146 100nA 549 1A 549 10A 549 100A
LT1012A * TA03
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LT1012A/LT1012
TYPICAL APPLICATIO S
Saturated Standard Cell Amplifier
15V 2N3609 3 7 6 OUT
1.018235V
U
+ -
LT1012 LT1008 2 4 -15V SATURATED STANDARD CELL #101 EPPLEY LABS NEWPORT, R.I.
+
R2
R1
THE TYPICAL 30pA BIAS CURRENT OF THE LT1012 WILL DEGRADE THE STANDARD CELL BY ONLY 1ppm/YEAR. NOISE IS A FRACTION OF A ppm. UNPROTECTED GATE MOSFET ISOLATES STANDARD CELL ON POWER DOWN
LT1012A * TA05
Amplifier for Bridge Transducers
R5 56M V+ S1 100k T R3 510k R4 510k 2
R1 100k
-
LT1012 6 OUT
3
+
VOLTAGE GAIN 100
S2 T 100k
R2 100k
R6 56M
LT1012A * TA06
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LT1012A/LT1012
TYPICAL APPLICATIO S
Amplifier for Photodiode Sensor
R1 5M 1%
15V 7k 3 200
S1
2
-
LT1012 6 OUT
LM399
3
+
VOUT = 10V/A
6.5k 1k
R2 5M 1%
Instrumentation Amplifier with 100V Common Mode Range
10M 100
15V 100M - IN 100M +IN 2 7 LT1012 3 6
- +
4
-5V
LT1012A * TA10
10M
-15V A V = 100 ALL RESISTORS 1% OR BETTER
LT1012A * TA09
14
U
Buffered Reference for A-to-D Converters
+ -
7 6 1k 2N3904
LT1012 2 4 3k
OUT 10V 1k*
LT1012A * TA07
*THE 1k PRELOAD MINIMIZES GLITCHES INDUCED BY TRANSIENT LOADS
LT1012A * TA08
Low Power Comparator with <10V Hysteresis
5V 1k 330k 100k 620k 6 100k OUT 2N3904
100k
10k +IN 10k
7 2
-
LT1012 3 + 4
1
OUT
-IN
3
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LT1012A/LT1012
TYPICAL APPLICATIO S
Air Flow Detector
15V 15V R2 10M 15V R1 1k 1 100k 2 IN 0.1V 8 7 6 OUT 9M 1V 100k 5% 3
+
TYPE J
2
-
-
LT1012 3 3 + 4 - 15V
COLD JUNCTION AT AMBIENT
MOUNT R1 IN AIRFLOW. ADJUST R2 SO OUTPUT GOES HIGH WHEN AIRFLOW STOPS
Resistor Multiplier
RIN 1G 3
+
LT1012 6 VOUT
2
-
10k
R1 10M
R2 1k R3 100k
RIN = R1 1 + R3 R2
(
U
Input Amplifier for 4.5 Digit Voltmeter
- +
5
7 6 4 9k* -15V 1000pF 1k* 0.1V 1V 10V 100V 1000V TO 1V FULL SCALE ANALOG TO DIGITAL CONVERTER
LT1012
900k
10V
90k
100V * RATIO MATCH 0.01% FN507 ALLEN BRADLEY DECADE VOLTAGE DIVIDER THIS APPLICATION REQUIRES LOW BIAS CURRENT AND OFFSET VOLTAGE, LOW NOISE, AND LOW DRIFT WITH TIME AND TEMPERATURE
LT1012A * TA12
LT1012A * TA11
1000V 10k
"No Trims" 12-Bit Multiplying DAC Output Amplifier
RFEEDBACK IOUT1 REFERENCE IN 0.1V TO 10V 12-BIT CMOS MULTIPLYING DAC IOUT2 2
-
LT1012 6 OUT
3
+
)
WHEN THE REFERENCE INPUT DROPS TO 0.1V, THE LEAST SIGNIFICANT BIT DECREASES TO THE MICROVOLT/PICOAMPERE RANGE
LT1012 * TA14
LT1012 * TA13
sn1012 1012afbs
15
LT1012A/LT1012
SCHE ATIC DIAGRA
TRIM 1 TRIM 8
800
800
22k Q7 Q8
22k
30pF
Q5
Q6 Q16 Q4 Q3 Q13 S
-IN 2 Q9
S Q1 Q2
S
+IN 3
Q10 Q39 3.7k Q17 Q18 Q19 20k 3.3k 4.3k V
-
4
LT1012A * SD01
16
W
OVER COMP 5 V+ 7 1.3k 4.2k Q20 Q14 Q29 Q22 1.5k 1.5k 2.5k Q43 Q25 Q21 Q27 Q37 Q24 1.3k Q30 40 100 3k 40 Q11 Q23 S Q15 50k 1.5k J1 Q12 Q31 Q32 Q33 Q28 Q26 Q42 1.5k Q38 OUT 6 Q36 Q34 Q35 320 4.8k 3.7k 3.7k 16k 40 330 Q40 Q41 3.3k
sn1012 1012afbs
W
LT1012A/LT1012
PACKAGE DESCRIPTIO U
H Package 8-Lead TO-5 Metal Can (.200 Inch PCD)
(Reference LTC DWG # 05-08-1320)
.335 - .370 (8.509 - 9.398) DIA .305 - .335 (7.747 - 8.509) .040 (1.016) MAX .050 (1.270) MAX GAUGE PLANE .165 - .185 (4.191 - 4.699) REFERENCE PLANE .500 - .750 (12.700 - 19.050) .016 - .021** (0.406 - 0.533) .027 - .045 (0.686 - 1.143) PIN 1 .028 - .034 (0.711 - 0.864) .200 (5.080) TYP .110 - .160 (2.794 - 4.064) INSULATING STANDOFF *LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE AND THE SEATING PLANE .016 - .024 **FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS (0.406 - 0.610) H8(TO-5) 0.200 PCD 0801
SEATING PLANE .010 - .045* (0.254 - 1.143)
45TYP
OBSOLETE PACKAGE
sn1012 1012afbs
17
LT1012A/LT1012
PACKAGE DESCRIPTIO
.300 - .325 (7.620 - 8.255)
.008 - .015 (0.203 - 0.381)
(
+.035 .325 -.015 8.255 +0.889 -0.381
)
INCHES MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
NOTE: 1. DIMENSIONS ARE
18
U
N8 Package 8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.400* (10.160) MAX 8 7 6 5 .255 .015* (6.477 0.381) 1 2 3 4 .130 .005 (3.302 0.127) .045 - .065 (1.143 - 1.651) .065 (1.651) TYP .120 (3.048) .020 MIN (0.508) MIN .018 .003 (0.457 0.076)
N8 1002
.100 (2.54) BSC
sn1012 1012afbs
LT1012A/LT1012
PACKAGE DESCRIPTIO U
S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.189 - .197 (4.801 - 5.004) NOTE 3 8 N N .245 MIN .160 .005 .228 - .244 (5.791 - 6.197) 1 .030 .005 TYP 2 3 N/2 N/2 .150 - .157 (3.810 - 3.988) NOTE 3 7 6 5 .045 .005 .050 BSC 1 2 3 4 .053 - .069 (1.346 - 1.752) 0- 8 TYP .004 - .010 (0.101 - 0.254) .014 - .019 (0.355 - 0.483) TYP .050 (1.270) BSC
SO8 0502
RECOMMENDED SOLDER PAD LAYOUT
.010 - .020 x 45 (0.254 - 0.508) .008 - .010 (0.203 - 0.254)
.016 - .050 (0.406 - 1.270) 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)
sn1012 1012afbs
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 its circuits as described herein will not infringe on existing patent rights.
19
LT1012A/LT1012
TYPICAL APPLICATIO
10V REFERENCE LT1021-10 235k*
R2 100k
10M
5k* ROSEMOUNT 78S OR EQUIVALENT
392k* -15V
20
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507
q
U
Kelvin-Sensed Platinum Temperature Sensor Amplifier
R1 182k 6.65M RF* 654k 5k R4 5k R3 1k 24.3k 10k 20V 2 200k 4.75k 100 AT 0C 619k * = WIRE WOUND RESISTORS ALL OTHER RESISTORS ARE 1% METAL FILM TRIM R2 AT 0C FOR V0 = 0V TRIM R3 AT 100C FOR V0 = 10V TRIM R4 AT 50C FOR V0 = 5V IN THE ORDER INDICATED POSITIVE FEEDBACK (R1) LINEARIZES THE INHERENT PARABOLIC NONLINEARITY OF THE PLATINUM SENSOR AND REDUCES ERRORS FROM 1.2C TO 0.004C OVER THE - 50C TO 150C RANGE 3
- +
7 LT1012 4 -15V 6 VOUT = 100mV/C - 50C TO 150C
RS
LT1012A * TA04
sn1012 1012afbs LW/TP 1202 1K REV B * PRINTED IN USA
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 1991

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