DESCRIPTIO Voltage Noise 1.1nV/Hz 1kHz 0.85nV/Hz 1kHz 1.0nV/Hz 10
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LT1028/LT1128 Ultralow Noise Precision High Speed
DESCRIPTIO
Voltage Noise 1.1nV/Hz 1kHz 0.85nV/Hz 1kHz 1.0nV/Hz 10Hz 35nVP-P Typ, 0.1Hz 10Hz Voltage Current Noise 100% Tested Gain-Bandwidth Product LT1028: 50MHz LT1128: 13MHz Slew Rate LT1028: 11V/µs LT1128: 5V/µs Offset Voltage: 40µV Drift with Temperature: 0.8µV/°C Voltage Gain: Million Available 8-Pin Package
LT®1028(gain stable)/LT1128(gain stable) achieve standard excellence noise performance with 0.85nV/Hz 1kHz noise, 1.0nV/Hz 10Hz noise. This ultralow noise combined with excellent high speed specifications (gain-bandwidth product 75MHz LT1028, 20MHz LT1128), distortion-free output, true precision parameters (0.1µV/°C drift, 10µV offset voltage, million voltage gain). Although LT1028/ LT1128 input stage operates nearly collector current achieve voltage noise, input bias current only 25nA. LT1028/LT1128's voltage noise less than noise resistor. Therefore, even very source impedance transducer audio amplifier applications, LT1028/LT1128's contribution total system noise will negligible.
registered trademarks Linear Technology Corporation
APPLICATIO
Noise Frequency Synthesizers High Quality Audio Infrared Detectors Accelerometer Gyro Amplifiers Bridge Signal Conditioning Magnetic Search Coil Amplifiers Hydrophone Amplfier
TYPICAL APPLICATIO
VOLTAGE NOISE DENSITY (nV/Hz)
Flux Gate Amplifier
DEMODULATOR SYNC
LT1028 SQUARE WAVE DRIVE 1kHz FLUX GATE TYPICAL SCHONSTEDT #203132 OUTPUT DEMODULATOR
CORNER 3.5Hz
1028/1128 TA01
Voltage Noise Frequency
MAXIMUM ±15V 25°C CORNER 14Hz TYPICAL FREQUENCY (Hz)
1028/1128 TA02
LT1028/LT1128 ABSOLUTE RATI (Note
Operating Temperature Range LT1028/LT1128AM, (OBSOLETE) 55°C 125°C LT1028/LT1128AC, (Note 40°C 85°C Storage Temperature Range Devices 65°C 150°C Lead Temperature (Soldering, sec.). 300°C
Supply Voltage -55°C 105°C ±22V 105°C 125°C ±16V Differential Input Current (Note ±25mA Input Voltage Equal Supply Voltage Output Short Circuit Duration Indefinite
PACKAGE/ORDER ATIO
VIEW TRIM TRIM
ORDER PART NUMBER
OVERCOMP
(CASE)
LT1028AMH LT1028MH LT1028ACH LT1028CH
PACKAGE 8-LEAD TO-5 METAL TJMAX 175°C, 140°C/W, 40°C/W
OBSOLETE PACKAGE
Consider Packages Alternate Source
VIEW TRIM TRIM
ORDER PART NUMBER LT1028ACN8 LT1028CN8 LT1128ACN8 LT1128CN8 LT1028AMJ8 LT1028MJ8 LT1028ACJ8 LT1028CJ8 LT1128AMJ8 LT1128MJ8 LT1128CJ8
VIEW TRIM
OVERCOMP
PACKAGE 8-LEAD PLASTIC TJMAX 130°C, 130°C/W PACKAGE 8-LEAD CERAMIC TJMAX 165°C, 100°C/W
OBSOLETE PACKAGE
Consider Package Alternate Source
Consult Marketing parts specified with wider operating temperature ranges.
ORDER PART NUMBER
VIEW TRIM
TRIM OVERCOMP
LT1028CS8 LT1128CS8 PART MARKING 1028 1128
PACKAGE 8-LEAD PLASTIC SOIC TJMAX 135°C, 140°C/W
ORDER PART NUMBER
TRIM OVERCOMP
LT1028CSW
PACKAGE 16-LEAD PLASTIC TJMAX 140°C, 130°C/W NOTE: THIS DEVICE RECOMMENDED DESIGNS
LT1028/LT1128
ELECTRICAL CHARACTERISTICS ±15V, 25°C, unless otherwise noted.
LT1028AM/AC LT1128AM/AC
SYMBOL Time PARAMETER Input Offset Voltage Long Term Input Offset Voltage Stability Input Offset Current Input Bias Current Input Noise Voltage Input Noise Voltage Density Input Noise Current Density Input Resistance Common Mode Differential Mode Input Capacitance Input Voltage Range Common Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain CONDITIONS (Note (Note 0.1Hz 10Hz (Note 10Hz (Note 1000Hz, 100% tested 10Hz (Note 1000Hz, 100% tested 1.00 0.85 ±11.0 ±12.2 30.0 20.0 15.0 ±12.3 ±13.0 ±11.0 ±12.2 11.0 15.0
LT1028M/C LT1128M/C
±12.2 30.0 20.0 15.0 ±13.0 ±12.2 15.0 UNITS µV/Mo nVP-P nV/Hz nV/Hz pA/Hz pA/Hz V/µV V/µV V/µV V/µs V/µs
10.0
±180 12.0
CMRR PSRR AVOL
VOUT
Maximum Output Voltage Swing Slew Rate Gain-Bandwidth Product Open-Loop Output Impedance Supply Current
±11V ±18V ±12V ±10V 600, ±10V AVCL AVCL 20kHz (Note 200kHz (Note
LT1028 LT1128 LT1028 LT1128
±11.0 ±12.0 ±10.5 11.0
10.5
-55°C 125°C. ±15V, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
SYMBOL Temp CMRR PSRR AVOL VOUT PARAMETER Input Offset Voltage Average Input Offset Drift Input Offset Current Input Bias Current Input Voltage Range Common Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing Supply Current CONDITIONS (Note (Note
denotes specifications which apply over temperature range LT1028AM LT1128AM
LT1028M LT1128M
0.25 ±11.7 14.0 10.0 ±11.6 ±300 UNITS µV/°C V/µV V/µV
±10.3V ±4.5V ±16V ±10V ±10V
±10.3 ±11.7 14.0 10.0 ±10.3 ±11.6
±150 ±10.3 ±10.3 11.5
13.0
LT1028/LT1128
70°C. ±15V, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
PARAMETER Input Offset Voltage Average Input Offset Drift Input Offset Current Input Bias Current Input Voltage Range Common Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing Supply Current CONDITIONS (Note (Note
denotes specifications which apply over temperature range LT1028AC LT1128AC LT1028C LT1128C
±120 ±10.5 ±11.5 ±9.0 10.5 ±12.0 25.0 18.0 ±12.7 ±10.5 ±240 UNITS µV/°C V/µV V/µV
SYMBOL Temp CMRR PSRR AVOL VOUT
±10.5V ±4.5V ±18V ±10V ±10V (Note
±10.5 ±12.0 25.0 18.0 ±11.5 ±12.7 ±9.5 ±11.0
11.5
ELECTRICAL CHARACTERISTICS
SYMBOL Temp CMRR PSRR AVOL VOUT PARAMETER Input Offset Voltage Average Input Offset Drift Input Offset Current Input Bias Current Input Voltage Range Common Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing Supply Current CONDITIONS
denotes specifications which apply over temperature range 40°C 85°C. ±15V, unless otherwise noted. (Note LT1028C LT1028AC LT1128C LT1128AC
(Note ±10.5V ±4.5V ±18V ±10V ±10V
±140
0.25 ±11.8 20.0 14.0 ±12.5
±280
UNITS µV/°C V/µV V/µV
±10.4 ±11.8 20.0 14.0 ±11.0 ±12.5
±10.4 ±11.0 11.0
12.5
Note Absolute Maximum Ratings those values beyond which life device impaired. Note Input Offset Voltage measurements performed automatic test equipment approximately sec. after application power. addition, 25°C, offset voltage measured with chip heated approximately 55°C account chip temperature rise when device fully warmed Note Long Term Input Offset Voltage Stability refers average trend line Offset Voltage Time over extended periods after first days operation. Excluding initial hour operation, changes during first days typically 2.5µV. Note This parameter tested sample basis only. Note 10Hz noise voltage density sample tested every with exception packages. Devices 100% tested 10Hz available request. Note Current noise defined measured with balanced source resistors. resultant voltage noise (after subtracting resistor noise
basis) divided source resistors obtain current noise. Maximum 10Hz current noise inferred from 100% testing 1kHz. Note Gain-bandwidth product tested. guaranteed design inference from slew rate measurement. Note This parameter 100% tested. Note inputs protected back-to-back diodes. Current-limiting resistors used order achieve noise. differential input voltage exceeds ±1.8V, input current should limited 25mA. Note This parameter guaranteed design, fully warmed 70°C. includes chip temperature increase supply load currents. Note LT1028/LT1128 designed, characterized expected meet these extended temperature limits, tested -40°C 85°C. Guaranteed grade parts available. Consult factory.
LT1028/LT1128
TYPICAL PERFOR CHARACTERISTICS
10Hz Voltage Noise Distribution
NUMBER UNITS
VOLTAGE NOISE (µV)
±15V 25°C UNITS MEASURED FROM RUNS
VOLTAGE NOISE DENSITY (nV/Hz)
LT1020/1120 TPC01
Total Noise Matched Source Resistance
TOTAL NOISE DENSITY (nV/Hz)
TOTAL NOISE DENSITY (nV/Hz)
CURRENT NOISE DENSITY (pA/Hz)
10Hz NOISE ONLY ±15V 25°C MATCHED SOURCE RESISTANCE 1kHz
LT1028/1128 TPC04
0.1Hz 10Hz Voltage Noise
±15V 25°C
VOLTAGE DENSITY (nV/Hz)
10nV
TIME (SEC)
LT1028/1128 TPC07
Wideband Noise, 20kHz
Wideband Voltage Noise (0.1Hz Frequency Indicated)
±15V 25°C
VERTICAL SCALE 0.5µV/DIV HORIZONTAL SCALE 0.5ms/DIV
0.01 100k BANDWIDTH (Hz)
LT1028/1128 TPC03
Total Noise Unmatched Source Resistance
Current Noise Spectrum
MAXIMUM CORNER 800Hz TYPICAL
10Hz
1kHz
CORNER 250Hz
NOISE ONLY ±15V 25°C UNMATCHED SOURCE RESISTANCE
LT1028/1128 TPC05
FREQUENCY (Hz)
LT1028/1128 TPC06
0.01Hz Voltage Noise
±15V 25°C
Voltage Noise Temperature
±15V
10Hz 1kHz
10nV
TIME (SEC)
TEMPERATURE (°C)
LT1028/1128 TPC08
LT1028/1128 TPC09
LT1028/LT1128
TYPICAL PERFOR CHARACTERISTICS
Distribution Input Offset Voltage
UNITS OFFSET VOLTAGE (µV)
LT1028/1128 TPC10
OFFSET VOLTAGE CHANGE (µV)
OFFSET VOLTAGE (µV)
±15V 25°C UNITS TESTED FROM FOUR RUNS
Warm-Up Drift
CHANGE OFFSET VOLTAGE (µV) METAL PACKAGE TIME AFTER POWER (MINUTES) DUAL-IN-LINE PACKAGE PLASTIC CERDIP
INPUT BIAS OFFSET CURRENTS (nA)
±15V 25°C
INPUT BIAS CURRENT (nA)
LT1028/1128 TPC13
Voltage Noise Supply Voltage
VOLTAGE NOISE DENSITY (nV/Hz)
25°C 1.25
SUPPLY CURRENT (mA)
±15V
SHORT-CIRCUIT CURRENT (mA) SINKING SOURCING
10Hz 1kHz
0.75
SUPPLY VOLTAGE
LT1028/1128 TPC16
Offset Voltage Drift with Temperature Representative Unit50 ±15V
Long-Term Stability Five Representative Unit10 ±15V 25°C AFTER PRE-WARM
TEMPERATURE (°C)
TIME (MONTHS)
LT1028/1128 TPC11
LT1028/1128 TPC12
Input Bias Offset Currents Over Temperature
BIAS CURRENT OFFSET CURRENT ±15V
Bias Current Over Common Mode Range
300M ±15V 65nA 25°C POSITIVE INPUT CURRENT (UNDERCANCELLED) DEVICE
NEGATIVE INPUT CURRENT (OVERCANCELLED) DEVICE COMMON MODE INPUT VOLTAGE
TEMPERATURE (°C)
LT1028/1128 TPC14
LT1028/1128 TPC15
Supply Current Temperature
TEMPERATURE (°C)
Output Short-Circuit Current Time
-50°C 25°C 125°C ±15V
125°C 25°C -50°C
TIME FROM OUTPUT SHORT GROUND (MINUTES)
LT1028/1128 TPC18
LT1028/1128 TPC17
LT1028/LT1128
TYPICAL PERFOR CHARACTERISTICS
Voltage Gain Frequency
±15V 25°C
OVERSHOOT
LT1128 0.01
LT1028
GAIN ±15V 25°C 10pF 100k FREQUENCY (Hz)
100M
-100 ±15V 25°C 10000
100k 100M FREQUENCY (Hz)
LT1028/1128 TPC19
LT1028/1128 TPC20
Gain Error Frequency Closed-Loop Gain 1000
TYPICAL PRECISION
VOLTAGE GAIN (dB)
LT1128 Gain Phase Frequency
PHASE
PHASE MARGIN (DEG)
LT1128 Capacitance Load Handling
30pF
GAIN ERROR
LT1128
GAIN
±15V 25°C 10pF 100k FREQUENCY (Hz) 100M
OVERSHOOT
±15V 25°C 10mVP-P 10000
LT1028 0.01
0.001
GAIN ERROR CLOSED-LOOP GAIN OPEN-LOOP GAIN FREQUENCY (Hz)
LT1028/1128 TPC22
-100,
LT1028/1128 TPC23
Voltage Gain Supply Voltage
25°C
Voltage Gain Load Resistance
PEAK-TO-PEAK OUTPUT VOLTAGE
±15V
Maximum Undistorted Output Frequency
±15V 25°C
VOLTAGE GAIN (V/µV)
VOLTAGE GAIN (V/µV)
-55°C
25°C 125°C
ILMAX 35mA -55°C 27mA 25°C 16mA 125°C SUPPLY VOLTAGE LOAD RESISTANCE
LT`1028/1128 TPC25
LT1028/1128 TPC26
PHASE MARGIN (DEG)
VOLTAGE GAIN (dB)
VOLTAGE GAIN (dB)
LT1028 Gain, Phase Frequency
PHASE
LT1028 Capacitance Load Handling
30pF
1000 CAPACITIVE LOAD (pF)
LT1028/1128 TPC21
1000 CAPACITIVE LOAD (pF)
LT1028/1128
LT1128
LT1028
100k FREQUENCY (Hz)
LT1028/1128 TPC27
LT1028/LT1128
TYPICAL PERFOR CHARACTERISTICS
LT1028 Large-Signal Transient Response
50mV SLEW RATE (V/µs) 20mV/DIV
5V/DIV
-10V -50mV
1µs/DIV 15pF
LT1128 Large-Signal Transient Response
50mV
SLEW RATE (V/µs)
-10V -50mV
2µs/DIV 30pF
Closed-Loop Output Impedance
±15V 25°C 1000 LT1128 LT1028
OUTPUT IMPEDANCE
SLEW RATE (V/µs)
SLEW RATE (V/µs)
LT1128 LT1028
0.01
0.001
FREQUENCY (Hz)
100k
LT1028/1128 TPC34
LT1028 Small-Signal Transient Response
LT1028 Slew Rate, Gain-Bandwidth Product Over Temperature
GAIN-BANDWIDTH PRODUCT 20kHz), (MHz)
±15V FALL RISE
0.2µs/DIV 15pF, 80pF
TEMPERATURE (°C)
LT1028/1128 TPC30
LT1128 Small-Signal Transient Response
LT1128 Slew Rate, Gain-Bandwidth Product Over Temperature
GAIN-BANDWIDTH PRODUCT 200kHz), (MHz)
FALL
RISE
0.2µs/DIV 10pF
TEMPERATURE (°C)
LT1028/1128 TPC33
LT1128 Slew Rate, Gain-Bandwidth Product Over-Compensation Capacitor
LT1028 Slew Rate, Gain-Bandwidth Product Over-Compensation Capacitor
SLEW RATE
SLEW
GAIN 200kHz
GAIN 20kHz
FROM ±15V 25°C
1000 10000 OVER-COMPENSATION CAPACITOR (pF)
LT1028/1128 TPC35
1000 10000 OVER-COMPENSATION CAPACITOR (pF)
LT1028/1128 TPC36
LT1028/LT1128
TYPICAL PERFOR CHARACTERISTICS
Common Mode Limit Over Temperature
COMMON MODE LIMIT REFERRED POWER SUPPLY
COMMON MODE REJECTION RATIO (dB)
POWER SUPPLY REJECTION RATIO (dB)
±15V
±15V
TEMPERATURE (°C)
LT1028/1128 TPC37
LT1028 Total Harmonic Distortion Frequency Load Resistance
TOTAL HARMONIC DISTORTION
TOTAL HARMONIC DISTORTION
1000
0.01
NOISE VOLTAGE DENSITY (nV/÷Hz)
1000
0.01
-1000 1000 20VP-P ±15V 25°C FREQUENCY (kHz)
LT1028/1128 TPC40
0.001
LT1128 Total Harmonic Distortion Frequency Load Resistance
TOTAL HARMONIC DISTORTION TOTAL HARMONIC DISTORTION
1000
0.01
0.001
Common Mode Rejection Ratio Frequency
LT1128 100k FREQUENCY (Hz) LT1028 ±15V 25°C
Power Supply Rejection Ratio Frequency
±15V 25°C
NEGATIVE SUPPLY POSITIVE SUPPLY
100k FREQUENCY (Hz)
LT1028/1128 TPC39
LT1028/1128 TPC38
LT1028 Total Harmonic Distortion Closed-Loop Gain
20VP-P 1kHz ±15V 25°C NON-INVERTING GAIN
High Frequency Voltage Noise Frequency
0.001
INVERTING GAIN MEASURED EXTRAPOLATED CLOSED LOOP GAIN 100k
0.0001
100k FREQUENCY (Hz)
LT1028/1128 TPC42
LT1028/1128 TPC41
LT1128 Total Harmonic Distortion Closed-Loop Gain
20VP-P 1kHz ±15V 25°C NON-INVERTING GAIN
1000
0.01
-1000 1000 20VP-P ±15V 25°C FREQUENCY (kHz)
LT1028/1128 TPC43
0.001
INVERTING GAIN
MEASURED EXTRAPOLATED CLOSED LOOP GAIN 100k
0.0001
LT1028/1128 TPC44
LT1028/LT1128
APPLICATI ATIO OISE
largest term, example above, LT1028/ LT1128's voltage noise becomes negligible. further increased, current noise becomes important. 1kHz, when excess 20k, current noise component larger than resistor noise. total noise versus matched source resistance plot illustrates above calculations. plot also shows that current noise more dominant frequencies, such 10Hz. This because resistor noise flat with frequency, while corner current noise typically 250Hz. 10Hz when current noise term will exceed resistor noise. When source resistance unmatched, total noise versus unmatched source resistance plot should consulted. Note that total noise lower source resistances below because resistor noise contribution less. When total noise improved, however. This because bias current cancellation used reduce input bias current. cancellation circuitry injects correlated current noise components into inputs. With matched source resistors injected current noise creates common-mode voltage noise gets rejected amplifier. With source resistance input only, cancellation noise added amplifier's inherent noise. summary, LT1028/LT1128 optimum amplifiers noise performance, provided that source resistance kept low. following table depicts which manufactured Linear Technology should used minimize noise, source resistance increased beyond LT1028/LT1128's level usefulness.
1028/1128 AI01
Voltage Noise Current Noise LT1028/LT1128's less than 1nV/Hz voltage noise three times better than lowest voltage noise heretofore available LT1007/1037). necessary condition such voltage noise operating input transistors nearly collector currents, because voltage noise inversely proportional square root collector current. Current noise, however, directly proportional square root collector current. Consequently, LT1028/LT1128's current noise significantly higher than most monolithic amps. Therefore, realize truly noise performance important understand interaction between voltage noise (en), current noise (In) resistor noise (rn). Total Noise Source Resistance total input referred noise given [en2 (InReq)2]1/2 where total equivalent source resistance inputs, 4kTReq 0.13Req nV/Hz 25°C numerical example, consider total noise 1kHz gain 1000 amplifier shown below.
100k
LT1028 LT1128
100k 0.13200 1.84nVHz 0.85nVHz 1.0pA/Hz [0.852 1.842 (1.0 0.2) 2]1/2 2.04nV/Hz Output noise 1000 2.04µV/Hz very source resistance (Req voltage noise dominates. increased resistor noise becomes
Best Lowest Total Noise Source Resistance
SOURCE RESISTANCE() (Note 500k 500k BEST FREQ(10Hz) WIDEBAND(1kHz) LT1028/LT1128 LT1007/1037 LT1001 LT1012 LT1012 LT1055 LT1055 LT1028/LT1128 LT1028/LT1128 LT1007/1037 LT1001 LT1012 LT1055
Note Source resistance defined matched unmatched, e.g., means: each input, input zero other.
LT1028/LT1128
APPLICATI ATIO OISE
Measuring typical 35nV peak-to-peak noise performance LT1028/LT1128 requires special test precautions: device should warmed least five minutes. warms offset voltage changes typically 10µV chip temperature increasing 30°C 40°C from moment power supplies turned second measurement interval these temperature-induced effects easily exceed tens nanovolts. similar reasons, device must well shielded from current eliminate possibility thermoelectric effects excess nanovolts, which would invalidate measurements. Sudden motion vicinity device also "feedthrough" increase observed noise. noise-voltage density test recommended when measuring noise large number units. 10Hz noisevoltage density measurement will correlate well with 0.1Hz 10Hz peak-to-peak noise reading since both results determined white noise location corner frequency.
Noise Testing Voltage Noise LT1028/LT1128's voltage noise density accurately measured using Quan Tech Noise Analyzer, Model 5173 equivalent noise tester. Care should taken, however, subtract noise source resistor used. Prefabricated test cards Model 5173 device under test closed-loop gain with source resistor 1.8k feedback resistor. noise this resistor combination 0.1358 1.0nV/Hz. LT1028/LT1128 with 0.85nV/Hz noise will read (0.852 1.02)1/2 1.31nV/Hz. better resolution, resistors should replaced with source feedback resistor. Even resistor will show apparent noise which high. 0.1Hz 10Hz peak-to-peak noise LT1028/ LT1128 measured test circuit shown. frequency response this noise tester indicates that 0.1Hz corner defined only zero. test time measure 0.1Hz 10Hz noise should exceed seconds, this time limit acts additional zero eliminate noise contributions from frequency band below 0.1Hz.
0.1Hz 10Hz Noise Test Circuit
0.1µF 100k
GAIN (dB)
LT1001
4.7µF
100k VOLTAGE GAIN 50,000 DEVICE UNDER TEST NOTE CAPACITOR VALUES NONPOLARIZED CAPACITORS ONLY 24.3k 0.1µF
2.2µF
4.3k
0.1Hz 10Hz Peak-to-Peak Noise Tester Frequency Response
22µF
0.01
SCOPE 110k
1028/1128 AI02
FREQUENCY (Hz)
LT1028/1128 AI03
LT1028/LT1128
APPLICATI
ATIO OISE
10Hz voltage noise density sample tested every lot. Devices 100% tested 10Hz available request additional charge. 10Hz current noise tested every inferred from 100% testing 1kHz. look current noise spectrum plot will substantiate this statement. only 10Hz current noise exceed guaranteed limits corner higher than 800Hz and/or white noise high. that case then 1kHz test will fail.
Noise Testing Current Noise Current noise density (In) defined following formula, measured circuit shown: [eno2 18.4nV/Hz)2]1/2
1.8k
LT1028 LT1128
1028/1128 AI04
NOISE FILTER LOSS (dB)
Quan Tech Model 5173 used, noise reading input-referred, therefore result should divided resistor noise should multiplied 100% Noise Testing 1kHz voltage current noise 100% tested LT1028/LT1128 part automated testing; approximate frequency response filters shown. limits automated testing established extensive correlation tests units measured with Quan Tech Model 5173.
APPLICATI
General
ATIO
LT1028/LT1128 series devices inserted directly into OP-07, OP-27, OP-37, LT1007 LT1037 sockets with without removal external nulling components. addition, LT1028/LT1128 fitted 5534 sockets with removal external compensation components. Offset Voltage Adjustment input offset voltage LT1028/LT1128 drift with temperature, permanently trimmed wafer testing level. However, further adjustment necessary, nulling potentiometer will degrade drift with temperature. Trimming value other
Automated Tester Noise Filter
CURRENT NOISE VOLTAGE NOISE
100k
LT1028/1128 AI05
FREQUENCY (Hz)
INPUT
OUTPUT
LT1028 LT1128 -15V
1028/1128 AI06
than zero creates drift (VOS/300)µV/°C, e.g., adjusted 300µV, change drift will 1µV/°C. adjustment range with approximately ±1.1mV. Offset Voltage Drift Thermocouple effects, caused temperature gradients across dissimilar metals contacts input
LT1028/LT1128
APPLICATI ATIO
Frequency Response LT1028's Gain, Phase Frequency plot indicates that device stable closed-loop gains greater than because phase margin about open-loop gain 6dB. voltage follower configuration phase margin seems inadequate. This indeed true when output shorted inverting input noninverting input driven from source impedance. However, when feedback through parallel network (provided 68pF), LT1028 will stable because interaction between input resistance capacitance feedback network. Larger source resistance noninverting input similar effect. following voltage follower configurations stable:
33pF
1028/1128 AI08
terminals, exceed inherent drift amplifier unless proper care exercised. currents should minimized, package leads should short, input leads should close together maintained same temperature. circuit shown measure offset voltage also used burn-in configuration LT1028/LT1128.
Test Circuit Offset Voltage Offset Voltage Drift with Temperature
10k* 200* 10k*
LT1028 LT1128 -15V
100VOS RESISTORS MUST HAVE THERMOELECTRIC POTENTIAL
Unity-Gain Buffer Applications (LT1128 Only) When input driven with fast, largesignal pulse (>1V), output waveform will look shown pulsed operation diagram.
OUTPUT 6V/µ1028/1128 AI07
During fast feedthrough-like portion output, input protection diodes effectively short output input current, limited only output short-circuit protection, will drawn signal generator. With 500, output capable handling current requirements 20mA 10V) amplifier stays active mode smooth transition will occur. with operational amplifiers when pole will created with amplifier's input capacitance, creating additional phase shift reducing phase margin. small capacitor (20pF 50pF) parallel with will eliminate this problem.
LT1028
LT1028
1028/1128 AI09
Another configuration which requires unity-gain stability shown below. When large enough effectively short output input 15MHz, oscillations occur. insertion will prevent LT1028 from oscillating. When 500, additional noise contribution presence will minimal. When 100, necessary, because represents heavy load output through short. When 500, should match example, will stable. noise increase 40%.
LT1028
1028/1128 AI10
LT1028/LT1128
APPLICATI ATIO
tion high (70%) overshoot without 10pF capacitor because additional phase shift caused feedback resistor input capacitance pole. presence 10pF capacitor cancels this pole reduces overshoot Over-Compensation
1.1k
only used noise bandwidth, similar effect achieved using over-compensation terminal. Gain, Phase plot also shows that phase margin about gain (20dB). following configura10pF
LT1028
1028/1128 AI11
TYPICAL APPLICATIO
Strain Gauge Signal Conditioner with Bridge Excitation
5.0V
LT1021-5
LT1128 -15V BRIDGE
REFERENCE OUTPUT 301k*
ZERO TRIM
*RN60C FILM RESISTORS
LT1028
-15V
LT1028's NOISE CONTRIBUTION NEGLIGIBLE COMPARED BRIDGE NOISE.
LT1028/LT1128 equipped with frequency overcompensation terminal (Pin capacitor connected between output will reduce noise bandwidth. Details shown Slew Rate, Gain-Bandwidth Product Over-Compensation Capacitor plot. additional benefit increased capacitive load handling capability.
Noise Voltage Regulator
LT317A LT1021-10 2.3k PROVIDES PRE-REG CURRENT LIMITING
LT1028
2N6387
OUTPUT 30.1k*
LT1028 -15V
1000pF
OUTPUT
GAIN TRIM
49.9*
1028/1128 TA04
1028/1128 TA05
LT1028/LT1128
TYPICAL APPLICATIO
Paralleling Amplifiers Reduce Voltage Noise
LT1028
1.5k
4.7k
100pF
LT1028
1.5k
LT1028
1.5k
ASSUME VOLTAGE NOISE LT1028 SOURCE RESISTOR 0.9nV/Hz. GAIN WITH LT1028s PARALLEL 200. OUTPUT NOISE 0.9nV/Hz. OUTPUT NOISE INPUT REFERRED NOISE nV/Hz. NOISE CURRENT INPUT INCREASES TIMES. GAIN 1000, BANDWIDTH 1MHz, NOISE, 1MHz 0.9µV.
Noise, Wide Bandwidth Instrumentation Amplifier
-INPUT
LT1028
68pF
LT1028 +INPUT
68pF
1028/1128 TA09 1028/1128 TA08
GAIN 1000, BANDWIDTH 1MHz INPUT REFERRED NOISE 1.5nV/Hz 1kHz WIDEBAND NOISE 1MHz 3µVRMS LIMITED 100kHz 0.55µVRMS
Phono Preamplifier
LT1028
0.1µF 0.33µF OUTPUT
-15V RESISTORS METAL FILM
LT1028 OUTPUT
PHONO INPUT
1028/1128 TA06
Tape Head Amplifier
0.1µF 31.6k
LT1028 OUTPUT
TAPE HEAD INPUT
1028/1128 TA07
1028/1128 TA03
RESISTORS METAL FILM
Gyro Pick-Off Amplifier
GYRO TYPICAL- NORTHROP CORP. GR-F5AH7-5B SINE DRIVE
LT1028 OUTPUT
LT1028 OUTPUT SYNC DEMODULATOR
LT1028/LT1128
TYPICAL APPLICATIO
Super Distortion Variable Sine Wave Oscillator
0.047 0.047
2N4338
100k LT1055 TRIM LOWEST DISTORTION
<0.0018% DISTORTION NOISE. MEASUREMENT LIMITED RESOLUTION HP339A DISTORTION ANALYZER
Chopper-Stabilized Amplifier
1N758
LT1052 0.01
1N758 -15V 100k
INPUT
LT1028
OUTPUT -15V
1028/1128 TA11
LT1028
2.4k 5.6k 10pF 15µF
1VRMS OUTPUT 1.5kHz 15kHz WHERE R1C1 R2C2 4.7k
LT1004-1.2V
MOUNT 1N4148s CLOSE PROXIMITY
1028/1128 TA10
LT1028/LT1128
SCHE ATIC DIAGRA
NULL 257pF 500µA 900µA 900µA NONINVERTING INPUT 4.5µA 4.5µA 1.5µA 1.5µA INVERTING INPUT 35pF 4.5µA 4.5µA 250pF OUTPUT 1.1mA 2.3mA 400µA
NULL
1.8mA BIAS 300µA 600µA
50pF LT1028 275pF LT1128 OVERCOMP
1028/1128 TA13
LT1028/LT1128 PACKAGE DESCRIPTIO
OBSOLETE PACKAGE
CORNER LEADS OPTION PLCS)
0.045 0.068 (1.143 1.727) FULL LEAD OPTION 0.300 (0.762 BSC)
0.008 0.018 (0.203 0.457)
NOTE: LEAD DIMENSIONS APPLY SOLDER DIP/PLATE PLATE LEADS
0.300 0.325 (7.620 8.255)
0.009 0.015 (0.229 0.381)
0.065 (1.651) 0.125 (3.175) 0.020 (0.508) 0.018 0.003 (0.457 0.076)
+0.035 0.325 -0.015 8.255 +0.889 -0.381
*THESE DIMENSIONS INCLUDE MOLD FLASH PROTRUSIONS. MOLD FLASH PROTRUSIONS SHALL EXCEED 0.010 INCH (0.254mm)
Package 8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference 05-08-1610)
0.010 0.020 (0.254 0.508) 0.008 0.010 (0.203 0.254) 0.053 0.069 (1.346 1.752) 0.004 0.010 (0.101 0.254) 0.228 0.244 (5.791 6.197) 0.150 0.157** (3.810 3.988) 0.189 0.197* (4.801 5.004)
0.014 0.019 (0.355 0.483) *DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH SHALL EXCEED 0.006" (0.152mm) SIDE **DIMENSION DOES INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL EXCEED 0.010" (0.254mm) SIDE
0.016 0.050 (0.406 1.270)
Package 8-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference 05-08-1110)
0.005 (0.127) 0.405 (10.287) 0.023 0.045 (0.584 1.143) HALF LEAD OPTION 0.025 (0.635) 0.220 0.310 (5.588 7.874) 0.200 (5.080) 0.015 0.060 (0.381 1.524) 0.045 0.065 (1.143 1.651) 0.014 0.026 (0.360 0.660) 0.100 (2.54) 0.125 3.175
1298
Package 8-Lead PDIP (Narrow .300 Inch)
(Reference 05-08-1510)
0.045 0.065 (1.143 1.651) 0.130 0.005 (3.302 0.127) 0.400* (10.160)
0.255 0.015* (6.477 0.381)
0.100 (2.54)
1098
0.050 (1.270)
1298
LT1028/LT1128 PACKAGE DESCRIPTIO
Package 16-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference 05-08-1610)
0.386 0.394* (9.804 10.008)
0.010 0.020 (0.254 0.508) 0.008 0.010 (0.203 0.254)
0.016 0.050 (0.406 1.270) *DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH SHALL EXCEED 0.006" (0.152mm) SIDE **DIMENSION DOES INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL EXCEED 0.010" (0.254mm) SIDE
0.027 0.045 (0.686 1.143) 45°TYP 0.028 0.034 (0.711 0.864) 0.040 (1.016) 0.230 (5.842)
0.110 0.160 (2.794 4.064) INSULATING STANDOFF *LEAD DIAMETER UNCONTROLLED BETWEEN REFERENCE PLANE 0.045" BELOW REFERENCE PLANE 0.016 0.024 **FOR SOLDER LEAD FINISH, LEAD DIAMETER (0.406 0.610)
Information furnished Linear Technology Corporation believed accurate reliable. However, responsibility assumed use. Linear Technology Corporation makes representation that interconnection circuits described herein will infringe existing patent rights.
0.228 0.244 (5.791 6.197) 0.150 0.157** (3.810 3.988) 0.053 0.069 (1.346 1.752) 0.004 0.010 (0.101 0.254) 0.014 0.019 (0.355 0.483) 0.050 (1.270)
1098
Package 3-Lead TO-39 Metal
(Reference 05-08-1330)
0.335 0.370 (8.509 9.398) 0.305 0.335 (7.747 8.509) 0.050 (1.270) GAUGE PLANE 0.010 0.045* (0.254 1.143) 0.016 0.021** (0.406 0.533) 0.165 0.185 (4.191 4.699) REFERENCE PLANE 0.500 0.750 (12.700 19.050)
SEATING PLANE
(TO-5) 0.230 1197
OBSOLETE PACKAGE
LT1028/LT1128
TYPICAL APPLICATIO
100µF SYNCHRONOUS DEMODULATOR 10k* OPTICAL CHOPPER WHEEL RADIATION PHOTOELECTRIC PICK-OFF 1000µF INFRA ASSOCIATES, INC. HgCdTe DETECTOR 77°K LTC1043 LT1028 10k*
100µF
RELATED PARTS
PART NUMBER LT1806/LT1807 DESCRIPTION 325MHz, 3.5nV/Hz Single Dual Amps COMMENTS Slew Rate 140V/µs, Distortion 5MHz: -80dBc
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7417
(408) 432-1900
FAX: (408) 434-0507
Noise Infrared Detector
30pF LM301A
LT1012
1028/1128 TA12
1028fa LT/CP 0901 1.5K PRINTED
www.linear.com
LINEAR TECHNOLOGY CORPORATION 1992
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