Search FAQs on the left to see if your question has been answered. Click on the dropdown to view all of the documents associated with the product. If you can't find your question, click on Ask a Question.
What is the maximum junction temperature of AD698 or the maximum permissible power dissipation? This is not specified in the datasheet or any other related documentation.
The AD698 is around 30 years old and I don’t believe the max junction temperature was determined during product characterization and release. Also the max power dissipation of this device really depends on the power dissipated by the transducer driver circuit and the load at the signal output. The worst case junction temperature would be 125C since we have a model of the AD698 with a guaranteed ambient temperature of 125C. The die inside both models is the same, it’s just packaging that influences each different temperature range. The best case is 150C since this is the storage temperature rating. The die storage temp ensures that no permanent damage will result if the die experiences sustained temps up to 150C. While we'd expect the device to more or less function beyond the max ambient temperature up to the max storage temperature, ADI would expect non-destructive (recoverable) performance degradation due to heat when exceeding an ambient temperature. Performance of this device in customer applications operating outside of data sheet operating conditions can’t be guaranteed by ADI.