DESCRIPTIO Compatible with LH0070 AD581* Ultralow Drift-5ppm/°C S
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LT1031/LH0070 Precision Reference
DESCRIPTIO
Compatible with LH0070 AD581* Ultralow Drift-5ppm/°C Slope Trimmed Output Voltage Operates Series Shunt Mode Output Sinks Sources Series Mode Very Noise 1ppmP-P 0.1Hz 10Hz 100dB Ripple Rejection Minimum Input Voltage
®1031 precision reference with ultralow drift noise, extremely good long term stability, almost total immunity input voltage variations. reference output will both source sink 10mA used shunt regulator (two terminal Zener) with same precision characteristics three terminal connection. Special care been taken minimize thermal regulation effects temperature induced hysteresis. LT1031 reference based buried Zener diode structure which eliminates noise stability problems associated with surface breakdown devices. Further, subsurface Zener exhibits better temperature drift time stability than even best band-gap references. Unique circuit design makes LT1031 first three terminal reference offer ultralow drift without high power on-chip heaters. Output voltage pretrimmed 0.05% accuracy. LT1031 used plug-in replacement AD581 LH0070,* with improved electrical thermal performance.
registered trademarks Linear Technology Corporation. other trademarks property their respective owners. *See LH0070 Electrical Characteristics table AD581 cross reference guide.
APPLICATIO
A-to-D D-to-A Converters Precision Regulators Digital Voltmeters lnertial Navigation Systems Precision Scales Portable Reference Standard
TYPICAL APPLICATIO
Basic Positive Negative Connections
LT1031 VOUT VOUT VOUT ILOAD 1.5mA LT1031
Distribution Output Accuracy
25°C DISTRIBUTION FROM RUNS PERCENT UNITS
LT1031 TA01
-0.10 -0.06
-0.02 0.02 0.06 OUTPUT ACCURACY 0.10
LT1031 TA02
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LT1031/LH0070
ABSOLUTE
(Note
RATI
PACKAGE/ORDER ATIO
BOTTOM VIEW INPUT
Input Voltage Input-Output Voltage Differential Output Ground Voltage (Shunt Mode Current Limit) Trim Ground Voltage Positive Equal VOUT Negative -20V Output Short-Circuit Duration Indefinite Operating Temperature Range LT1031M -55°C 125°C LT1031C 70°C Lead Temperature (Soldering, sec). 300°C
GROUND PACKAGE 3-LEAD TO-39 METAL TJMAX 150°C, 150°C/W, 45°C/W (LH0070) TJMAX 150°C, 150°C/W, 45°C/W (LT1031M) TJMAX 85°C, 150°C/W, 45°C/W (LT1031C) OUTPUT
ORDER PART NUMBER LH0070-0H LH0070-1H LH0070-2H LT1031BMH LT1031DMH LT1031BCH LT1031CCH LT1031DCH
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER Output Voltage (Note
(LT1031) denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. 15V, IOUT Comm version, unless noted.
CONDITIONS LT1031B LT1031C LT1031D TMIN TMAX LT1031B LT1031C LT1031D 11.5V 14.5V 4.5V Shunt Mode Minimum Current Output Short-Circuit Current Minimum Input Voltage (Note Open lOUT 0.1Hz 10Hz 10Hz 10kHz 1000 Non-Cumulative 50°C 10.8 11.0 9.995 9.990 9.980 LT1031 10.000 10.000 10.000 10.005 10.010 10.020 UNITS ppm/°C ppm/°C ppm/°C ppm/V ppm/V ppm/V ppm/V ppm/mA ppm/mA ppm/mA ppm/mA µVP-P µVRMS
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Output Voltage Temperature Coefficient (Note
Line Regulation (Note
IMIN
Load Regulation (Sourcing Current) Load Regulation (Shunt Mode) Series Mode Supply Current
IOUT 10mA (Note 1.7mA ISHUNT 10mA (Notes
Time
Output Voltage Noise Long Term Stability Output Voltage Temperature Hysteresis Output
LT1031/LH0070
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER Output Voltage Output Accuracy Output Accuracy Output Voltage Change with Temperature Line Regulation Input Voltage Range Time Load Regulation Quiescent Current Change Quiescent Current Output Noise Voltage Ripple Rejection Output Resistance Long Term Stability 25°C (Note 120Hz lOUT from
(LH0070) denotes specifications which apply over full operating temperature range. 15V, 10k, 55°C 125°C, unless noted.
CONDITIONS 25°C 25°C LH0070 10.000 0.03 0.02 0.05 UNITS
-55°C, 125°C
Note 33V, 25°C 0.006 0.006 11.4 0.01 0.001 0.05 0.03 0.03 µVP-P %/VP-P %/Yr %/Yr 0.02 0.01 0.04
Note Absolute Maximum Ratings those values beyond which life device impaired. Note Output voltage measured immediately after turn-on. Changes chip warm-up typically less than 0.005%. Note Temperature coefficient measured dividing change output voltage over temperature range change temperature. Separate tests done cold: TMIN 25°C 25°C TMAX. Incremental slope also measured 25°C. LT1031BMH, 5ppm/°C drift specification 25°C 85°C. Drift over full 55°C 125°C range guaranteed 7ppm/°C.
Note Line load regulation measured pulse basis. Output changes temperature change must taken into account separately. Package thermal resistance 150°C/W. Note Shunt mode regulation measured with input open. With input connected, shunt mode current reduced 0mA. Load regulation will remain same. Note Temperature drift guaranteed from -25°C 85°C LH0070. Note curve guaranteed minimum versus IOUT. Note Guaranteed design.
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LT1031/LH0070 CROSS REFERENCE
following cross reference guide used select LT1031 grades which meet exceed output voltage, temperature drift, load line regulation, output current specifications AD581 reference. Parameters such noise, hysteresis, long term stability will significantly better LT1031 grades compared AD581.
CROSS REFERENCE GUIDE/LT1031 AD581 AD581J AD581K AD581L A0581S A0581U order LT1031DCH order LT1031CCH order LT1031BCH order LT1031DMH order LT1031BMH
TYPICAL PERFOR CHARACTERISTICS
Ripple Rejection
REJECTION (dB)
REJECTION (dB)
150Hz
INPUT VOLTAGE
INPUT VOLTAGE
Start-Up (Series Mode)
OUTPUT VOLTAGE
NOISE VOLTAGE (nV/Hz)
TIME (µs)
OUTPUT VOLTAGE
Ripple Rejection
FREQUENCY (Hz)
LT1031 TPC02 LT1031 TPC01
Minimum Input Voltage
11.6 11.4 11.2 11.0 10.8 10.6 10.4 10.2 10.0 OUTPUT CURRENT (mA)
LT1031 TPC03
COUT
GUARANTEED CURVE-ALL TEMPS
125°C -55°C
25°C
Start-Up (Shunt Mode)
-12V VOUT
Output Voltage Noise Spectrum
TIME (µs)
FREQUENCY (Hz)
LT1031 TPC06
LT1031 TPC04
LT1031 TPC05
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LT1031/LH0070 TYPICAL PERFOR CHARACTERISTICS
Output Voltage Noise
NOISE (µV)
COUT FILTER POLE fLOW 0.1Hz OUTPUT CHANGE (mV)
OUTPUT VOLTAGE
BANDWIDTH (Hz)
LT1031 TPC07
Input Supply Current
INPUT CURRENT (mA)
IOUT
-55°C
CURRENT INTO OUTPUT (mA)
25°C 125°C
125°C 25°C -55°C
CURRENT INTO OUTPUT (mA)
INPUT VOLTAGE
Thermal Regulation
POWER 200mW
OUTPUT VOLTAGE CHANGE OUTPUT CHANGE (mV)
OUTPUT VOLTAGE CHANGE
-0.5 -1.0 -1.5 ILOAD 10mA LOAD REGULATION THERMAL* REGULATION
TIME (ms) *INDEPENDENT TEMPERATURE COEFFICIENT
LT1031 TPC13
LT1031 TPC10
Load Regulation
10.006 10.004 10.002 10.000 9.998 9.996
Output Voltage Temperature
SOURCING SINKING OUTPUT CURRENT (mA)
9.994
TEMPERATURE (°C)
LT1031 TPC08
LT1031 TPC09
Shunt Characteristics
INPUT OPEN
Shunt Mode Current Limit
INPUT OPEN
OUTPUT GROUND VOLTAGE
OUTPUT VOLTAGE
LT1031 TPC11
LT1031 TPC12
Load Transient Response CLOAD
ISOURCE 100µAp-p ISOURCE ISINK 100µAp-p ISINK 0.6mA 50mV 10mV ISINK 0.8mA ISOURCE 0.2mA
Load Transient Response CLOAD 1000pF
ISOURCE 100µAp-p ISOURCE ISINK 100µAp-p ISINK 0.8mA 20mV ISINK 1.2mA
ISOURCE 0.5mA ISOURCE 10mA ISINK 1.4mA
ISINK 1.0mA
ISOURCE 10mA
ISINK 10mA
ISINK 10mA TIME (µs) NOTE VERTICAL SCALE CHANGE BETWEEN SOURCING SINKING
TIME (µs) NOTE VERTICAL SCALE CHANGE BETWEEN SOURCING SINKING
LT1031 TPC14
LT1031 TPC15
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LT1031/LH0070 TYPICAL PERFOR CHARACTERISTICS
Output Noise 0.1Hz 10Hz
OUTPUT VOLTAGE NOISE (10µV/DIV)
FILTERING ZERO 0.1Hz POLES 10Hz
APPLICATIO ATIO
Trimming Output Voltage
LT1031 output trimmed driving ground pin. suggested method shown illustration below. resistor inserted series with ground pin. resistor supplied current from trim potentiometer. This technique requires fairly high trim current 1.5mA from LT1031 3.5mA from -15V supply; however necessary maintain drift reference. Ground current changes LT1031, with temperature, could high 4µA/°C. This, coupled with external resistor, creates 2ppm/°C drift reference 4µA/°C 20µV/°C 2ppm/°C). induced drift higher than this tolerated, resistor values trim circuit raised proportionately reduce current drain.
Output Voltage Trimming
LT1031 4.3k R1** -15V *CAN INCREASED 5.6k LT1031B LH0070-2 **INCREASE LT1031D VOUT
MAXIMUM TEMPERATURE COEFFICIENT 1/2LSB ERROR (ppm/°C)
LT1031 TA04
10µV (1ppm)
TIME (MINUTES)
LT1031 TPC16
Effect Reference Drift System Accuracy large portion temperature drift error budget many systems system reference voltage. graph below indicates maximum temperature coefficient allowable reference contribute more than 1/2LSB error overall system performance. example shown 12-bit system designed operate over temperature range from 25°C 65°C. Assuming system calibration performed 25°C, temperature span 40°C. graph shows that temperature coefficient reference must worse than 3ppm/°C contribute less than 1/2LSB error. this reason, LT1031 been optimized drift.
Maximum Allowable Reference Drift
8-BIT
10-BIT
12-BIT 14-BIT
TEMPERATURE SPAN (°C)
LT1031 TA03
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LT1031/LH0070
APPLICATIO ATIO
Capacitive Loading Transient Response LT1031 stable with capacitive loads, optimum settling with load transients, output capacitance should under 1000pF. output stage reference class with fairly idling current. This makes transient response worst-case light load currents. Because internal current drain output, actual worst-case occurs LOAD 1.4mA (sinking). Significantly better load transient response obtained moving slightly away from these points. Load Transient Response curves details. general, best transient response obtained when output sourcing current. critical applications, 10µF solid tantalum capacitor with several ohms series provides optimum output bypass. Kelvin Connections Although LT1031 does have true force/sense capability outputs, significant improvements ground loop line loss problems achieved with proper hook-up. series mode operation, ground LT1031 carries only used sense line, greatly reducing ground loop loss problems side reference. high side supplies load current line resistance must kept low. Twelve feet gauge hook wire foot 0.025 inch printed circuit trace will create loss 10mA output current. This equivalent 1LSB 10V, 12-bit system. following circuits show proper hook-up minimize errors ground loops line losses. Losses output lead greatly reduced adding boost transistor load currents higher. added further reduce current output sense lead.
Standard Series Mode
LT1031 INPUT KEEP THIS LINE RESISTANCE
LOAD
GROUND RETURN
LT1031 TA05
Series Mode with Boost Transistor
INPUT 2N3906 LT1031 5.6k LOAD GROUND RETURN *OPTIONAL-REDUCES CURRENT OUTPUT SENSE LEAD
LT1031 TA06
Effects Movement Frequency Noise LT1031 very noise because buried zener used design. 0.1Hz 10Hz band, peak-to-peak noise about 0.5ppm output. achieve this noise, however, care must taken shield reference from ambient turbulence. movement create noise because thermoelectric differences between package leads (especially kovar lead TO-5) printed circuit board materials and/or sockets. Power dissipation reference, even though rarely exceeds 20mW, enough cause small temperature gradients package leads. Variations thermal resistance, caused uneven airflow, create differential lead temperatures, thereby causing thermoelectric voltage noise output reference. plotter trace shown following page dramatically illustrates this effect. first half plot done with LT1031 shielded from ambient with small foam cup. then removed second half trace. Ambient both cases environment with excessive turbulence from conditioners, opening/closing doors, etc. Removing foam increases output noise almost order magnitude 0.01Hz band! kovar leads TO-5 package primary culprit. Alloy copper lead frames used dual-inline packages nearly sensitive thermally generated noise because they intrinsically matched.
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LT1031/LH0070
APPLICATIO ATIO
There nothing magical about foam cups-any enclosure which blocks flow from reference will Smaller enclosures better since they allow build-up internally generated movement. Naturally, heat generating components external reference itself should included inside enclosure.
OUTPUT VOLTAGE NOISE (20µV/DIV)
APPLICATIO CIRCUITS
Negative Series Reference
4.7k 4.7k -10V 50mA
LT1031 AC01
LT1031
-15V
2N2905
Boosted Output Current with Current Limit
12.8V
2N2905 LT1031 100mA SOLID TANT
*GLOWS CURRENT LIMIT OMIT
LT1031 AC03
Noise Induced Turbulence (TO-5 Package)
(TO-5 PACKAGE) 0.01Hz 10Hz
20µV
FOAM REMOVED
TIME (MINUTES)
LT1031 TA07
Boosted Output Current with Current Limit
11.8V 2N2905 LT1031 100mA SOLID TANT
LT1031 AC02
Handling Higher Load Currents
30mA
LT1031
VOUT TYPICAL LOAD CURRENT 30mA
*SELECT DELIVER TYPICAL LOAD CURRENT LT1031 WILL THEN SOURCE SINK NECESSARY MAINTAIN PROPER OUTPUT. REMOVE LOAD, OUTPUT WILL DRIVEN (UNREGULATED) HIGH. LINE REGULATION DEGRADED THIS APPLICATION LT1031 AC04
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LT1031/LH0070
APPLICATIO CIRCUITS
Strain Gauge Conditioner Bridge
1/2W
LM301A
100pF
1/2W -15V *THIS RESISTOR PROVIDES POSITIVE FEEDBACK BRIDGE ELIMINATE LOADING EFFECT AMPLIFIER. EFFECTIVE AMPLIFIER STAGE R2-R5 CHANGED, **BRIDGE ULTRA LINEAR WHEN LEGS ACTIVE, COMPRESSION TENSION, WHEN SIDE ACTIVE WITH COMPRESSED TENSIONED OFFSET DRIFT LM301A VIRTUALLY ELIMINATED DIFERENTIAL CONNECTION LT1012C
LT1031 AC05
Ultralinear Platinum Temperature Sensor*
LT1031 R1** 253k
182k
6.65M Rf** 654k
100k
R3**
4.75k
200k
LT1001
-15V
392k -15V
619k
STANDARD INDUSTRIAL PLATINUM 4-WIRE SENSOR, ROSEMOUNT 78S, EQUIVALENT. 0.00385
TRIM VOUT TRIM VOUT 100°C TRIM VOUT 50°C TRIM SEQUENCE SHOWN. TRIMS NON-INTERACTIVE THAT ONLY TRIM SEQUENCE NORMALLY REQUIRED. *FEEDBACK LINEARIZES OUTPUT ±0.005°C FROM 50°C 150°C **WIREWOUND RESISTORS WITH
LT1031 AC06
28mA LT1031 28.5mA STRAIN GUAGE BRIDGE**
LT1012C
VOUT
24.3k VOUT 100mV/°C -50°C 150°C
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LT1031/LH0070
APPLICATIO CIRCUITS
2-Pole Lowpass Filtered Reference
MYLAR
LT1031 10Hz 0.5µF MYLAR LT1001 +VREF
TOTAL NOISE 2µVRMS 10kHz
-VREF
LT1031 AC07
Negative Shunt Reference Driven Current Source
LT1031 -10V (ILOAD 1mA) 2.5mA
LM334
-11V -40V
LT1031 AC08
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LT1031/LH0070
APPLICATIO CIRCUITS
Precision Reference with System Trim
LT1031 8.87k ROOM TEMP TRIM
EQUIVALENT SCHEMATIC
INPUT
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.
IN457 1.24k
TRIM*
10.36k
IN457
200k
8.45k
*TRIMS REFERENCE CURRENT 40ppm/°C. THIS TRIM SCHEME VERY LITTLE EFFECT ROOM TEMPERATURE CURRENT MINIMIZE ITERATIVE TRIMMING.
LT1031 AC09
OUTPUT
6.3V
LT1031 ES01
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LT1031/LH0070
PACKAGE DESCRIPTIO
Package 3-Lead TO-39 Metal
(Reference 05-08-1330)
.350 .370 (8.890 9.398) .305 .335 (7.747 8.509) .050 (1.270) REFERENCE PLANE .165 .185 (4.191 4.699) .016 .019** (0.406 0.483) .200 (5.080) .500 (12.700) .100 (2.540) .029 .045 (0.737 1.143) .028 .034 (0.711 0.864) .100 (2.540)
H3(TO-39) 0801
*LEAD DIAMETER UNCONTROLLED BETWEEN REFERENCE PLANE .050" BELOW REFERENCE PLANE .016 .024 **FOR SOLDER LEAD FINISH, LEAD DIAMETER (0.406 0.610)
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, 95035-7417
(408) 432-1900 FAX: (408) 434-0507
1105 PRINTED
www.linear.com
LINEAR TECHNOLOGY CORPORATION 2005
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