UDOS001 TELEDYNE | Alldatasheet

Document overview

  • PDF pages: 5

Technical content

DESCRIPTION

The Micro Dosimeter (P/N UDOS001 ) is a compact hybrid microcircuit which directly measures total ionizing dose (TI D) absorbed by an internal silicon test mass. The test mass simulates silicon die of integrated circuits on-board a host spacecraft in critical mission payloads and subsystems. By accurately measuring the energy absorbed from electrons, protons, and gamma rays, an estimate of the dose absorbed by other electronic devices on the same vehicle can be made. The Micro Dosimeter c an operate from a wide range of power supply voltages. The accumulated dose is presented to three cascaded dc linear outputs and one pseudo-logarithmic output giving a dose resolution of 14 µrad(Si) and a measurement range up to 40 krad(Si). These outputs are intended to be directly connected to most analog-to-digital converters (ADCs) or spacecraft housekeeping analog inputs (0-5V range), which makes minimal demands on the host vehicle. FEATURES/BENEFITS PART NUMBER DESCRIPTION UDOS001-C Micro Dosimeter - Commercial UDOS001-H Micro Dosimeter - Class H Equivalent Screening BETTER THAN INDUSTRY STANDARDS CLASSIFICATION DESCRIPTION

  • Commercial - Electrical Test Only
  • Class H - MIL-PRF 38534 Equivalent Screening LOCATION OF DETECTORLOCATION OF DETECTORLOCATION OF DETECTOR Location of Detector Pin 1 μDOS001 Micro Dosimeter Product Specification
  • First compact microcircuit that provides a repeatable measurement of radiation dose over a wide range of energies
  • Uses a patented integrator architecture to produce a flat energy response
  • High reliability hermetic packaging
  • Enables routine monitoring of spacecraft radiation environment
  • Custom microchip in a small footprint package which results in significantly lower weight and power than alternative devices
  • Can be mounted in multiple locations on spacecraft
  • Correlates environmental models and ray-tracing analyses with real in-flight measurements
  • Provides total mis sion dose to aid in diagnosis of spacecraft anomalies that result from changes in environmental fluxes
  • Dosimeters can be integrated to standard spacecraft housekeeping systems
  • Measures up to 40 krad(Si)
  • Mechanical dimensions: 1.4” x 1.0” x 0.040” 20 grams in weight
  • 10 mA from 13 Vdc to 40 Vdc input
  • Simple linear analog output
  • Commercial Class H-equivalent screening available NOTE rights reserved / Approved for Public Release Teledyne e2v HiRel Electronics requests that the Micro Dosimeter data be made available to The Aerospace Corporation for the purpose of improving space environment models used to predict radiation dose with the multitude of Micro Dosimeter data obtained from orbits.

μDOS001 PIN SPECIFICATIONS Pin Description Notes

1 Power

2 Ground

3 Reserved - connect to ground during normal operation

4 N/C - should be formed and mounted

5 DAC Output - Low Range Low

6 DAC Output - Medium Range Medium

7 DAC Output - High Range High

8 DAC Output - Pseudo-Log Log

Parameters Symbol Min Max Units Supply Voltage Vcc 13 40 Vdc Supply Current Icc 8 12 mA Dose Rate 1 10,000 µrad(Si)/sec Integrated Error -20 +20 % Low Energy Threshold Et 60 120 keV Energy Range Er Et 15 MeV Dose Sensitivity S 12 16 µrad(Si)/step DAC Voltage Step 15 25 mV DAC Output Voltage Swing 5 V DAC Output Impedance 8 12 kΩ Relative Humidity RH 0 90 % Operating Temperature To -30 +40 °C Storage Temperature Ts -40 + 110 °C PRINCIPLE OF OPERATION The UDOS001 incorporates a silicon detector (3 mm x 7 mm x 250 µm) and a pulse-processing architecture that creates a shaped pulse in response to ionizing radiation. This pulse is integrated into an accumulator circuit. The integration continues for each event until a preset limit is reached. When this happens, a Quanta of charge is removed from the integrator equal to a value of 14 µrads, and a counter value is incremented. This counter is divided into sub-groups of 8 bits which are each presented to a D/A converter. The DAC Low range gives dose as 14 µrads per 19.5 mV step, the DAC Medium range is 256 times the Low range, and the High is 256 times the Medium range. The UDOS001 will retain the value of the dose for as long as it is powered. A Pseudo-Log output can be sampled at a very low rate to monitor the total dose over extended periods of time. The other DAC ranges can be sampled at higher rates to obtain useful dose rate measurements. Note: The dosimeter does not measure incident energy directly. The dosimeter measures the amount of energy absorbed in the silicon detector due to the energy loss of the particle as it passes through the detector volume. RATINGS © 2021 Teledyne e2v HiRel Electronics. All rights reserved / Approved for Public Release 765 Sycamore Dr, Milpitas, CA, | 931.359.4531 | www.tdehirel.com 2DSUDOS001 Rev D-TD Micro Dosimeter Product Specification The UDOS001 drawing shows the hermetic package, mounting flange and 8 external connections. All dimensions given are in inches and tolerances are ±0.005. The package walls are 0.040 inch thick and the cover is 0.010 inch thick.

DACx Dose Conversion Range Low (Pin 5) 14 µrad(Si)/19.5 mV 0 - 3.6 mrad(Si) Medium (Pin 6) 3.6 mrad(Si) /19.5 mV 0 - 0.9 rad(Si) High (Pin 7) 0.9 rad(Si) /19.5 mV 0 - 235 rad(Si) Log (Pin 8) Detailed Table Will Be Provided Upon Request 0 - 40 krad(Si) RADIATION SURVIVABILITY Xe-beam testing done at Lawrence Berkeley Labs demonstrated latch-up immunity up to 67.8 LET (MeV-cm2/mg). Harsh proton susceptibility testing was performed using a high energy beam and UDOS001 showed no degradation up to 40 krad(Si). DAC OUTPUT CONVERSIONS μDOS001 Micro Dosimeter Product Specification © 2021 Teledyne e2v HiRel Electronics. All rights reserved / Approved for Public Release 765 Sycamore Dr, Milpitas, CA, | 931.359.4531 | www.tdehirel.com 2DSUDOS001 Rev D-TD APPLICATION NOTES Grounding The UDOS001 case is electrically connected to pin 2 inside the hybrid in order to minimize electromagnetic interference on the s ensitive detector electronics. Isolate the dosimeter case from structural chassis to avoid ground loops. Supply Voltage Ensure voltage input is stable and maintains the required voltage level. No ripple from dc converters, on board voltage supply should be clean. Energy Threshold The UDOS001 typically will integrate the dose absorbed by the silicon detector for energy deposits in the nominal range of 100 keV to 15 MeV. Calibration Each dosimeter can be exposed to a known “fixed” source level of ionizing dose by the end user to calibrate the dosage input to DAC output. Positioning of the dosimeter and area shielding can be used for directional mapping of radiation events. DAC/Log Output Resets When any of the DAC or Log outputs reaches its maximum value of 5-volts, the output is reset to 0-volts and the next higher DAC is incremented by 1 step. If the device reaches its maximum dose (i.e., the internal dose counter reaches its maximum), the Micro Dosimeter will reset all outputs and continue stepping in response to radiation. The outputs should be buffered or connected to a high impedance ADC. During operation, the outputs should be sampled at the same time to avoid TID ambiguity.

μDOS001 Micro Dosimeter Product Specification © 2021 Teledyne e2v HiRel Electronics. All rights reserved / Approved for Public Release 765 Sycamore Dr, Milpitas, CA, | 931.359.4531 | www.tdehirel.com 2DSUDOS001 Rev D-TD QUALITY FLOW The Micro Dosimeter hybrids are built using commercial grade and military grade components. All assembled hybrids receive full electrical testing at HIGH, LOW and ROOM operating temperature ranges. Class H-equivalent screening options are available as per the screening tables below: Class H-equivalent Screening Options

Contact Information: Teledyne e2v ~ www.tdehirel.com Contact Us: tdemarketing@teledyne.com Trademarks are the property of their respective owners. Advanced Information: The product is in a formative or design stage. The data sheet contains design target specifications for product development. Specifications and features may change in any manner without notice. Preliminary Specification: The data sheet contains preliminary data. Additional data may be added at a later date. Teledyne e2v HiRel reserves the right to change specifications at any time without notice in order to supply the best possible product. Product Specification: The data sheet contains final data. In the event e2v, Inc decides to change the specifications, Teledyne e2v HiRel will notify customers of the intended changes by issuing a CNF (Customer Notification Form). The information in this data sheet is believed to be reliable. However, Teledyne e2v HiRel assumes no liability for the use of this information. Use shall be entirely at the user’s own risk. No patent rights or licenses to any circuits described in this data sheet are implied or granted to any third party. Teledyne e2v HiRel’s products are not designed or intended for use in devices or systems intended for surgical implant, or in other applications intended to support or sustain life, or in any application in which the failure of the Teledyne e2v HiRel product could create a situation in which personal injury or death might occur. Teledyne e2v HiRel assumes no liability for damages, including consequential or incidental damages, arising out of the use of its products in such applications. © 2021 Teledyne e2v HiRel Electronics. All rights reserved / Approved for Public Release 765 Sycamore Dr, Milpitas, CA, | 931.359.4531 | www.tdehirel.com 2DSUDOS001 Rev D-TD μDOS001 Micro Dosimeter Product Specification