SBAA436 March   2021 REF34-Q1 , REF3425 , REF3425-EP , REF3430 , REF3430-EP , REF3433 , REF3433-EP , REF3440 , REF3440-EP , REF3450 , REF4132 , REF4132-Q1 , REF5010 , REF5020 , REF5020-EP , REF5020A-Q1 , REF5025 , REF5025-EP , REF5025-HT , REF5025A-Q1 , REF5030 , REF5030A-Q1 , REF5040 , REF5040-EP , REF5040A-Q1 , REF5045 , REF5045A-Q1 , REF5050 , REF5050-EP , REF5050A-Q1 , REF6125 , REF6133 , REF6141 , REF6145 , REF6150 , REF6225 , REF6230 , REF6233 , REF6241 , REF6245 , REF6250 , REF70

 

  1.   Long-Term Drift in Voltage References
  2.   Trademarks
  3. 1Long-Term Drift
  4. 2Long-Term Drift Data Sheet Measurement
  5. 3Long-Term Drift Error
  6. 4Package and Mold Compound Stress
  7. 5Test Setup
  8. 6Temperature Effect
  9. 7Long-Term Drift Estimation
  10. 8Methods to Minimize LTD Impact
  11. 9Reference

5 Test Setup

At TI, LTD test is done on fully automated multisite bench setups. An example of one setup is shown in Figure 5-1. The PCB assembly is done with solder reflow to mimic exact application board condition and get uniform solder stress profile across all the devices. The PCB board and devices are fresh and not pre-baked. Oil bath is used to provide very stable temperature (±0.01°C variation) environment. All the devices are always powered on. Output of all the references are measured by 8.5 digits DMM after every half an hour. DMM is calibrated before each measurement cycle. All the error sources on the bench setup are calibrated with respect to Fluke732B voltage standard. LTD oil bath is above the room temperature (35°C) to avoid variations in room temperature causing any issues.

GUID-20210301-CA0I-NMFQ-SWBJ-KXW52WQSGCFM-low.jpg Figure 5-1 LTD Oil Bath Setup