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ADS1248: part information needed

Part Number: ADS1248
Other Parts Discussed in Thread: ADS1148-Q1, , ADS124S08

Couple of questions

1.  The part drawing gives 2 temperature limits .. 105C ambient and 125C ambient.  I was told by help desk that all parameters in table 7.5 are met at 105C, but some are not met all the way to 125C. Can you provide details as to what parameters are not good to 125C ambient (and maybe what ambient temperature they are good to if you have that)? 

2.  Do you have a maximum operational junction temperature for the part at 105C, or the maximum allowable power dissipation (so that the junction limit can be calculated using the JA value).  The thermal data includes JB, JC, etc … but no junction limit in which case these values don't mean much.

Just as an explanation, working in aerospace our environments sometimes exceed the ambient limits (especially if its 85C, but 105 C in this case is a possibility).  When this happens we pursue the junction limit, which is more representative of the parts capability.

  • Hi Kerry,

    The ADS1248 was initially designed and characterized to an industrial operating temperature range.  The electrical characteristics data table specifies that the device will follow the characteristics as shown in the table up to 105 deg C.  The ADS1248 will be functional beyond 105 and operate up to 125 deg C, but performance at the higher temperature is not guaranteed with respect to the min and max values shown in the table.  There is a 16-bit version, the ADS1148-Q1, which is specified to 125 deg C for the electrical characteristics.

    If this is a new design, I would highly recommend using the ADS124S08 instead.  This device is an updated version with a better performance specification and operating temperature range specified at 125 deg C.  

    We don't specify the maximum power dissipation for the ADS1248 as there are many different device features and settings.  You can get a basic idea from the electrical characteristics power supply data shown on page 10 of the ADS1248 datasheet.  These values are only shown as typical and do not include the use of the IDACs.  You can find additional information in the Semiconductor and IC Package Thermal Metrics application report.

    Best regards,

    Bob B