LM169H

LM169 LM369 Precision Voltage Reference December 1994 LM169 LM369 Precision Voltage Reference General Description The LM169 LM369 are precision monolithic temperaturecompensated voltage references They are based on a buried zener reference as pioneered in the LM199 references but do not require any heater as they rely on special temperature-compensation techniques (Patent Pending) The LM169 makes use of thin-film technology enhanced by the discrete laser trimming of resistors to achieve excellent Temperature coefficient (Tempco) of Vout (as low as 1 ppm C) along with tight initial tolerances (as low as 0 05% max) The trim scheme is such that individual resistors are cut open rather than being trimmed (partially cut) to avoid resistor drift caused by electromigration in the trimmed area The LM169 also provides excellent stability vs changes in input voltage and output current (both sourcing and sinking) The devices have a 10 000V output and will operate in either series or shunt mode the output is short-circuit-proof to ground A trim pin is available which permits fine-trimming of Vout and also permits filtering to greatly decrease the output noise by adding a small capacitor (0 05 to 0 5 mF) Features Y Y Y Y Y Y Y Y Low Tempco 3 ppm C g 5 mV Excellent initial accuracy Excellent line regulation 4 ppm V g 0 8X Excellent output impedance Excellent thermal regulation g 20 ppm 100 mW Low noise Easy to filter output noise Operates in series or shunt mode (max) (max) (max) (max) (max) Applications Y Y Y Y Y High-Resolution Data Acquisition Systems Digital volt meters Weighing systems Precision current sources Test Equipment Connection Diagrams Metal Can Package (H) Dual-In-Line Package (N) or S O Package (M) TL H 9110 – 5 Top View Order Number LM369DM LM369DMX LM369N LM369BN LM369CN or LM369DN See NS Package Number M08A or N08E X denotes 2500 units on Tape and Reel and is not included in the device part number marking TL H 9110 – 1 Top View (Case is connected to ground ) Do not connect internal connection for factory trims TO-226 Plastic Package (RC) Order Number LM169H LM169BH LM169H 883 LM369H or LM369BH See NS Package Number H08C TL H 9110 – 28 Bottom View Order Number LM369DRC See NS Package Number RC03A Teflon and Mylar are registered trademarks of E I DuPont Corp C1995 National Semiconductor Corporation TL H 9110 RRD-B30M115 Printed in U S A Absolute Maximum Ratings (Note 8) Soldering Information a 260 C DIP (N) or Plastic (RC) Package 10 sec a 300 C H08 (H) Package 10 sec a 215 C SO (M) Package Vapor Phase (60 sec ) a 220 C Infrared (15 sec ) See AN-450 ‘‘Surface Mounting Methods and Their Effect on Product Reliability’’ (Appendix D) for other methods of soldering surface mount devices ESD Tolerance Czap e 100 pF Rzap e 1 5k 800V If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Input Voltage (Series Mode) Reverse Current (Shunt Mode) Power Dissipation (Note 7) Storage Temperature Range Operating Temperature Range LM169H LM169H 883 LM369 35V 50 mA 600 mW b 60 C to a 150 C (Tj min to Tj max) b 55 C to a 125 C 0 C to a 70 C Electrical Characteristics LM169 LM369 (Note 1) Parameter Conditions Typical Tested Limits (Notes 2 13) Design Limit (Note 3) Units (Max Unless Noted) V g 500 g5 Vout Nominal Vout Error Vout Tempco LM169B LM369B LM169 LM369 LM369C (Note 6) (Note 11) Line Regulation Load Regulation Sourcing Sinking (Note 12) (Note 4 Note 9) Thermal Regulation Sourcing Sinking (Note 12) (Note 5) Supply Current DSupply Current Short Circuit Current Noise Voltage 10 Hz to 1 kHz 0 1 Hz to 10 Hz (10 Hz to 10 kHz Cfilter e 0 1 mF) 1000 hours Tj k Tmax (Measured at a 25 C) DT e 25 C 13V s VIN s 30V (Note 11) a 10 000 50 0 50 10 27 6 20 a3 a 80 ppm mV ppm C ppm C ppm C 80 20 0 ppm V ppm mA ppm mA Tmin k Tj k Tmax Tmin k Tj k Tmax Tmin k Tj k Tmax 13V s VIN s 30V 0 to 10 mA 0 to b10 mA (t e 10 msec After Load is Applied) 30 50 10 40 g8 0 a 150 30 30 14 0 06 27 10 4 4 6 g 20 ppm 100 mW ppm 100 mW 20 02 11 65 mA mA mA min mA max mV rms mV p-p mV rms ppm 18 0 12 15 50 30 Long-term Stability (Non-Cumulative) (Note 10) Temperature Hysteresis of Vout Output Shift per 1 mA at Pin 5 3 1500 2600 ppm ppm 2 Electrical Characteristics LM369D (Note 1) Parameter Conditions Typical Tested Limits (Notes 2 13) Design Limit (Note 3) Units (Max Unless Noted) V g 1000 g 10 0 Vout Nominal Vout Error LM369D Vout Tempco (Note 6) Line Regulation Load Regulation Sourcing Sinking (Note 12) (Note 4 Note 9) Thermal Regulation Sourcing Sinking (Note 12) (Note 5) Supply Current DSupply Current Short Circuit Current Noise Voltage 10 Hz to 1 kHz 0 1 Hz to 10 Hz (10 Hz to 10 kHz Cfilter e 0 1 mF) 1000 Hours Tj k Tmax (Measured at a 25 C) DT e 25 C 13V s VIN s 30V Tmin s Tj s Tmax 13V s VIN s 30V 0 to 10 mA 0 to b10 mA (t e 10 msec After Load is Applied) a 10 000 70 07 5 24 a3 a 80 ppm mV 30 ppm C ppm V ppm mA ppm mA g6 0 12 g 25 g 12 a 160 40 40 15 0 06 27 10 4 4 8 g 25 ppm 100 mW ppm 100 mW 24 03 10 65 mA mA mA min mA max mV rms mV p-p mV rms ppm 20 0 16 14 50 30 Long-Term Stability (Non-Cumulative) Temperature Hysteresis of Vout Output Shift Per 1 mA at Pin 5 5 1500 2800 ppm ppm Note 1 Unless otherwise noted these conditions apply Tj e a 25 C 13V s Vin s 17V 0 s Iload s 1 0 mA CL e s 200 pF Specifications in BOLDFACED TYPE apply over the rated operating temperature range Note 2 Tested limits are guaranteed and 100% tested in production Note 3 Design Limits are guaranteed (but not 100% production tested) over the indicated temperature and supply voltage ranges These limits are not to be used to calculate outgoing quality levels Note 4 The LM169 has a Class B output and will exhibit transients at the crossover point This point occurs when the device is required to sink approximately 1 0 mA In some applications it may be advantageous to pre-load the output to either Vin or to ground to avoid this crossover point Note 5 Thermal regulation is defined as the change in the output voltage at a time T after a step change of power dissipation of 100 mW Note 6 Temperature Coefficient of VOUT is defined as the worst-case DVout measured at Specified Temperatures divided by the total span of the Specified Temperature Range (see graphs) There is no guarantee that the Specified Temperatures are exactly at the minimum or maximum deviation Note 7 In metal can (H) iJ-C is 75 C W and iJ-A is 150 C W In plastic DIP iJ-A is 160 C W In S0-8 iJ-A is 180 C W in TO-226 iJ-A is 160 C W Note 8 Absolute Maximum Ratings indicate limits beyond which damage to the device may occur DC and AC electrical specifications are not guaranteed beyond the Rated Operating Conditions Note 9 Regulation is measured at constant temperature using pulse testing with a low duty cycle Changes in output voltage due to heating effects are covered under the specifications for Thermal Regulation and Tempco Load Regulation is measured at a point on the output pin 1 8 below the bottom of the package Note 10 Consult factory for availability of devices with Guaranteed Long-term Stability Note 11 Consult factory for availability of devices with tighter Accuracy and Tempco Specifications Note 12 In Sinking mode connect 0 1 mF tantalum capacitor from output to ground Note 13 A military RETS electrical test specification is available on request 3 Typical Performance Characteristics (Note 1) Quiescent Current vs Input Voltage and Temperature Dropout Voltage vs Output Current (Series Mode Sourcing Current) Output Change vs Output Current Output Impedance vs Frequency Ripple Rejection vs Frequency Start-up Response TL H 9110 – 6 Output Noise vs Frequency Output Noise vs Filter Capacitor LM169 Temperature Coefficient Specified Temperatures (see Note 6) TL H 9110–24 TL H 9110 – 25 LM369 Temperature Coefficient Specified Temperatures (see Note 6) TL H 9110 – 26 Typical Temperature Coefficient Calculations LM169 (see curve above) T C e 1 6 mV (180 c 10V) e 8 9 c 10b7 e 0 89 ppm C LM369 (see curve at left) T C e 0 5 mV (75 c 10V) e 6 7 c 10b7 e 0 67 ppm C TL H 9110 – 27 4 Application Hints The LM169 LM369 can be applied in the same way as any other voltage reference The adjacent Typical Applications Circuits suggest various uses for the LM169 LM369 The LM169 is recommended for applications where the highest stability and lowest noise is required over the full military temperature range The LM369 is suitable for limited-temperature operation The curves showing the Noise vs Capacitance in the Typical Performance Characteristics section show graphically that a modest capacitance of 0 1 to 0 3 microfarads can cut the broadband noise down to a level of only a few microvolts less than 1 ppm of the output voltage The capacitor used should be a low-leakage type For the temperature range 0 to 50 C polyester or Mylar will be suitable but at higher temperatures a premium film capacitor such as polypropylene is recommended For operation at a 125 C a Teflon capacitor would be required to ensure sufficiently low leakage Ceramic capacitors may seem to do the job but are not recommended for production use as the high-K ceramics cannot be guaranteed for low leakage and may exhibit piezo-electric effects converting vibration or mechanical stress into excessive electrical noise Additionally the inherent superiority of the LM169 369’s buried Zener diode provides freedom from low-frequency noise wobble and jitter in the frequency range 0 01 to 10 Hertz where capacitive filtering is not feasible Pins 1 3 7 and 8 of the LM169 369 are connected to internal trim circuits which are used to trim the device’s output voltage and Tempco during final testing at the factory Do not connect anything to these pins or improper operation may result These pins would not be damaged by a short to ground or by Electrostatic Discharges however keep them away from large transients or AC signals as stray capacitance could couple noises into the output These pins may be cut off if desired Alternatively a shield foil can be laid out on the printed circuit board surrounding these pins and pin 5 and this guard foil can be connected to ground or to Vout effectively acting as a guard against AC coupling and DC leakages The trim pin (pin 5) should also be guarded away from noise signals and leakages as it has a sensitivity of 15 millivolts of DVout per microampere The trim pin can also be used in the circuits shown to provide an output trim range of g 10 millivolts Trimming to a wider range is possible but is not recommended as it may degrade the Tempco and the Tempco linearity at temperature extremes For example if the output were trimmed up to 10 240V the Tempco would be degraded by 8 ppm C As a general rule Tempco will be degraded by 1 ppm C per 30 mV of output adjustment The output can sink current as well as source it but the output impedance is much better for sourcing current Also the LM169 369 requires a 0 1 mF tantalum capacitor (or 0 1 mF in series with 10X) bypass from the output to ground for stable operation in shunt mode (output sinking current) The output has a class-B stage so if the load current changes from sourcing to sinking an output transient will occur To avoid this transient it may be advisable to preload the output with a few milliamperes of load to ground The LM169 369 does have an excellent tolerance of load capacitance and in cases of load transients electrolytic or tantalum capacitors in the range 1 to 500 microfarads have been shown to improve the output impedance without degrading the dynamic stability of the device The LM169 369 are rated to drive an output of g 10 mA but for best accuracy any load current larger than 1 mA can cause thermal errors (such as 1 mA c 5V c 4 ppm 100 mW e 0 2 ppm or 2 microvolts) and degrade the ultimate precision of the output voltage The output is short-circuit-proof to ground However avoid overloads at high ambient temperatures as a prolonged short-circuit may cause the junction temperature to exceed the Absolute Maximum Temperature The device does not include a thermal shut-down circuit If the output is pulled to a positive voltage such as a 15 or a 20V the output current will be limited but overheating may occur Avoid such overloads for voltages higher than a 20 V for more than 5 seconds or at high ambient temperatures The LM169 369 has an excellent long-term stability and is suitable for use in high-resolution Digital Voltmeters or Data Acquisition systems Its long-term stability is typically 3 to 10 ppm per 1000 hours when held near Tmax and slightly better when operated at room temperature Contact the factory for availability of devices with proven long-term stability Typical Applications Series Reference Shunt Reference with Optional Trim Series Reference with Optional Filter for Reduced Noise TL H 9110–2 TL H 9110 – 4 TL H 9110 – 3 NOTE Pin numbers for H M or N packages 5 Typical Applications (Continued) g 10V Reference g 5V Reference TL H 9110–7 TL H 9110 – 8 Multiple Output Voltages TL H 9110 – 10 TL H 9110–9 R e Thin Film Resistor Network 0 05% Matching and 5 ppm Tracking (Beckman 694-3-R-10K-A) (Caddock T-914-10K-100-05) (Allen Bradley F08B103A) or similar TL H 9110–11 NOTE Pin numbers for H M or N packages 6 Typical Applications (Continued) Precision Wide-Range Current Source A1 e LF411A LM607 LM308A or similar Q1 Q2 e high b PNP PN4250 2N3906 or similar e Part of Precision Resistor Network g 0 05% Matching (Allen Bradley F08B103A) (Caddock T-914-10K-100-05) (Beckman 694-3-R-10K-A) or similar TL H 9110 – 18 g 10V g 5V References Ae LF444A or LF412A or LM607 R e Thin Film Resistor Network 0 05% Matching and 5 ppm Tracking (Beckman 694-3-R-10K-A) (Caddock T-914-10K-100-05) (Allen Bradley F08B103A) or similar TL H 9110 – 12 Reference with Booster 100 mA Boosted Reference TL H 9110 – 13 TL H 9110 – 14 7 Typical Applications (Continued) Current Source 2k s Rx s 10M TL H 9110 – 16 Precision Current Source Q1 Q2 e high b PNP PN4250 2N3906 or similar A1 e LM607 LM11 LF411A or similar TL H 9110 – 17 8 Typical Applications (Continued) Oscilloscope Calibrator TL H 9110 – 22 Precision Wide-Range Current Sink 10V Rx A1 e LM11 LM607 or similar (V3 a 2V) s Vout s a 20V Q1 Q2 e high Beta NPN 2N3707 2N3904 or similar Iout e TL H 9110 – 19 Digitally Variable Supply Vout e b 10V c (Digitally Set Gain) A1 e LM11A LM607 or similar MDAC e DAC1220 DAC1208 DAC1230 or similar TL H 9110 – 20 9 Typical Applications (Continued) Ultra-Low-Noise Statistical Reference TL H 9110 – 23 200X s R s 1k When N pieces of LM369 are used the Vout noise is decreased by a factor of If the output buffer is not used for lowest noise add 0 1 mF Mylar 1 0N from ground to pin 5 of each LM369 LM169 Block Diagram TL H 9110 – 15 Do not connect internal connection for factory trim 10 Physical Dimensions inches (millimeters) Metal Can Package (H) Order Number LM169BH LM169H LM169H 883 LM369BH or LM369H NS Package Number H08C 11 Physical Dimensions inches (millimeters) (Continued) Surface Mount Package (M) Order Number LM369DM or LM369DMX NS Package Number M08A 12 Physical Dimensions inches (millimeters) (Continued) Molded Dual-In-Line Package (N) Order Number LM369BN LM369N LM369CN or LM369DN NS Package Number N08E 13 LM169 LM369 Precision Voltage Reference Physical Dimensions inches (millimeters) (Continued) Molded TO-226 Package (RC) Order Number LM369DRC NS Package Number RC03A LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION As used herein 1 Life support devices or systems are devices or systems which (a) are intended for surgical implant into the body or (b) support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably 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at any time without notice to change said circuitry and specifications