LM1815EP NSC | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 12
Technical content
Features
■ Adaptive hysteresis ■ Single supply operation ■ Ground referenced input ■ True zero crossing timing reference ■ Operates from 2V to 12V supply voltage ■ Handles inputs from 100 mVP-P to over 120VP-P with external resistor ■ CMOS compatible logic
Applications
■ Selected Military Applications ■ Selected Avionics Applications
Ordering Information
PART NUMBER VID PART NUMBER NS PACKAGE NUMBER (Note 3) LM1815MXEP V62/04634-01 M14A (Note 1, Note 2) TBD TBD Note 1: For the following (Enhanced Plastic) versions, check for availability: LM1815MEP, LM1815NEP. Parts listed with an "X" are provided in Tape & Reel and parts without an "X" are in Rails. Note 2: FOR ADDITIONAL ORDERING AND PRODUCT INFORMATION, PLEASE VISIT THE ENHANCED PLASTIC WEB SITE AT: www.national.com/ mil Note 3: Refer to package details under Physical Dimensions © 2010 National Semiconductor Corporation 200905 www.national.com
200905 Version 2 Revision 1 Print Date/Time: 2010/07/23 13:58:32
LM1815EP Enhanced Plastic Adaptive Variable Reluctance Sensor Amplifier
See NS Package Number M14A or N14A www.national.com 2
Absolute Maximum Ratings (Note 4) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage 12V Power Dissipation (Note 5) 1250 mW Operating Temperature Range −40°C ≤ TA ≤ +125°C Storage Temperature Range −65°C ≤ TJ ≤ +150°C Junction Temperature +150°C Input Current ±30 mA Lead Temperature (Soldering, 10 sec.) 260°C Electrical Characteristics (TA = 25°C, VCC = 10V, unless otherwise specified, see Figure 1) Parameter Conditions Min Typ Max Units Operating Supply Voltage 2.5 10 12 V Supply Current Pin 3 = -0.1V, Pin 9 = 2V, Pin 11 = 0.8V 3.6 6 mA Reference Pulse Width fIN = 1Hz to 2kHz, R = 150kΩ, C = 0.001µF 70 100 130 µs Logic Input Bias Current VIN = 2V, (Pin 9 and Pin 11) 5 µA Signal Input Bias Current VIN = 0V dc, (Pin 3) -200 nA Logic Threshold (Pin 9 and Pin 11) 0.8 1.1 2.0 V VOUT High RL = 1kΩ, (Pin 10) 7.5 8.6 V VOUT Low ISINK = 0.1mA, (Pin 10) 0.3 0.4 V Output Leakage Pin 12 V12 = 11V 0.01 10 µA Saturation Voltage P12 I12 = 2mA 0.2 0.4 V Input Zero Crossing Threshold All Modes, VSIGNAL = 1V pk-pk -25 0 25 mV (Note 7) Minimum Input Arming Threshold Mode 1, Pin 5 = Open 30 45 60 mV (Note 7) Mode 2, Pin 5 = VCC 200 300 450 mV (Note 7) Mode 3, Pin 5 = Gnd -25 0 25 mV (Note 7) Adaptive Input Arming Threshold Mode 1, Pin 5 = Open V SIGNAL ≥ 230mV pk-pk (Note 6) 40 80 90 %(Note 7) Mode 2, Pin 5 = VCC V SIGNAL ≥ 1.0V pk-pk (Note 6) %(Note 7) Mode 3, Pin 5 = Gnd V SIGNAL ≥ 150mV pk-pk (Note 6) %(Note 7) Note 4: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices should be operated at these limits. The table of “Electrical Characteristics” specifies conditions of device operation. Note 5: For operation at elevated temperatures, the device must be derated based on a 150°C maximum junction temperature and a thermal resistance of 80° C/W (DIP), 120°C/W (SO-14) junction to ambient. Note 6: Tested per Figure 1, VSIGNAL is a Sine Wave; FSIGNAL is 1000Hz. Note 7: The Min/Typ Max limits are relative to the positive voltage peak seen at VIN Pin 3. 3 www.national.com
Typical Performance Characteristics Mode 1 Minimum Arming Threshold vs Temperature 20090505 Mode 2 Minimum Arming Threshold vs Temperature 20090506 Mode 3 Minimum Arming Threshold vs Temperature 20090507 Mode 1 Minimum Arming Threshold vs VCC 20090508 www.national.com 4
Mode 2 Minimum Arming Threshold vs VCC 20090509 Pin 3 VIN vs VSIGNAL 20090510 Pin 3 VIN vs VSIGNAL, RIN = 10kΩ 20090511 Pin 3 VIN vs VSIGNAL, RIN = 20kΩ 20090512 Pin 3 VIN vs VSIGNAL, RIN = 50kΩ 20090513 Pin 3 Bias Current vs Temperature 20090514 5 www.national.com
Peak Detector Charge Current vs Temperature 20090515 Peak Detector Charge Current vs VCC 20090516 Peak Detector Voltage vs Pin 3 VIN, Mode 1 20090517 Peak Detector Voltage vs Pin 3 VIN, Mode 2 20090518 Peak Detector Voltage vs Pin 3 VIN, Mode 3 20090519 www.national.com 6
FIGURE 1. LM1815EP Adaptive Sense Amplifier
www.national.com 8
FIGURE 2. LM1815EP Oscillograms cy range for the intended application. the recommended maximum input signal voltage is ±54V (i.e. cross zero in the negative direction to trigger it. then be triggered by a negative-going zero crossing. ternally at pin 7 track decreases in the input signal. at pin 7 is not identical to the peak voltage appearing at pin 3.
and triggers on the next negative-going zero crossing when the arming threshold is has been exceeded. MODE 3, PIN 5 GROUNDED With pin 5 grounded, the input arming threshold is set to 0V, ±25mV maximum. Positive-going zero crossings arm the chip, and the next negative-going zero crossing triggers it. This is the very basic form of zero-crossing detection. ONE SHOT TIMING The one shot timing is set by a resistor and capacitor con- nected to pin 14. The recommended maximum resistor value is 150kohms. The capacitor value can be changed as needed, as long as the capacitor type does not present any signfigant leakage that would adversely affect the RC time constant. The output pulse width is: pulse width = 0.673 x R x C (1) For a given One Shot pulse width, the recommended maxi- mum input signal frequency is: Fin(max) = 1/(1.346 x R x C) (2) In the application example shown in figure 1 (R=150kohms, C=0.001µF) the recommended maximum input frequency will typically be 5kHz. Operating with input frequencies above the recommended Fin (max) value may result in unreliable per- formance of the One Shot circuitry. For those applications where the One Shot circuit is not required, device pin 14 can be tied directly to Ground. LOGIC INPUTS In some systems it is necessary to externally generate pulses, such as during stall conditions when the variable reluctance sensor has no output. External pulse inputs at pin 9 are gated through to pin 10 when Input Select (pin 11) is pulled high. Pin 12 is a direct output for the one shot and is unaffected by the status of pin 11. Input/output pins 9, 11, 10, and 12 are all CMOS logic com- patible. In addition, pins 9, 11, and 12 are TTL compatible. Pin 10 is not guaranteed to drive a TTL load. Pins 1, 4, 6 and 13 have no internal connections and can be grounded. www.national.com 10
Physical Dimensions inches (millimeters) unless otherwise noted 14-Lead Small Outline Circuit (M) Molded Dual-In-Line Package (N) 11 www.national.com
LM1815EP Enhanced Plastic Adaptive Variable Reluctance Sensor Amplifier For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Design Support Amplifiers www.national.com/amplifiers WEBENCH® Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage References www.national.com/vref Design Made Easy www.national.com/easy PowerWise® Solutions www.national.com/powerwise Applications & Markets www.national.com/solutions Serial Digital Interface (SDI) www.national.com/sdi Mil/Aero www.national.com/milaero Temperature Sensors www.national.com/tempsensors SolarMagic™ www.national.com/solarmagic PLL/VCO www.national.com/wireless PowerWise® Design University www.national.com/training THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. NATIONAL MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE ACCURACY OR COMPLETENESS OF THE CONTENTS OF THIS PUBLICATION AND RESERVES THE RIGHT TO MAKE CHANGES TO SPECIFICATIONS AND PRODUCT DESCRIPTIONS AT ANY TIME WITHOUT NOTICE. NO LICENSE, WHETHER EXPRESS, IMPLIED, ARISING BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. TESTING AND OTHER QUALITY CONTROLS ARE USED TO THE EXTENT NATIONAL DEEMS NECESSARY TO SUPPORT NATIONAL’S PRODUCT WARRANTY. EXCEPT WHERE MANDATED BY GOVERNMENT REQUIREMENTS, TESTING OF ALL PARAMETERS OF EACH PRODUCT IS NOT NECESSARILY PERFORMED. NATIONAL ASSUMES NO LIABILITY FOR APPLICATIONS ASSISTANCE OR BUYER PRODUCT DESIGN. BUYERS ARE RESPONSIBLE FOR THEIR PRODUCTS AND APPLICATIONS USING NATIONAL COMPONENTS. PRIOR TO USING OR DISTRIBUTING ANY PRODUCTS THAT INCLUDE NATIONAL COMPONENTS, BUYERS SHOULD PROVIDE ADEQUATE DESIGN, TESTING AND OPERATING SAFEGUARDS. EXCEPT AS PROVIDED IN NATIONAL’S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, NATIONAL ASSUMES NO LIABILITY WHATSOEVER, AND NATIONAL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY RELATING TO THE SALE AND/OR USE OF NATIONAL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS PRIOR WRITTEN APPROVAL OF THE CHIEF EXECUTIVE OFFICER AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: Life support devices or systems are devices 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 expected to result in a significant injury to the user. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness. National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. Copyright© 2010 National Semiconductor Corporation For the most current product information visit us at www.national.com National Semiconductor Americas Technical Support Center Email: support@nsc.com Tel: 1-800-272-9959 National Semiconductor Europe Technical Support Center Email: europe.support@nsc.com National Semiconductor Asia Pacific Technical Support Center Email: ap.support@nsc.com National Semiconductor Japan Technical Support Center Email: jpn.feedback@nsc.com www.national.com