Electronics > Metrology

REF70 new from TI

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fcb:
Just came across this:

https://www.ti.com/product/REF70

Grandchuck:
It is in a ceramic package.  The typical drift is 28 ppm from 0 to 1000 hours. The REF70 will experience the highest drift in the
initial 1000 hr.  Subsequent deviation is typically lower than 13 ppm for the next 1000 hrs.

kleiner Rainer:
There is also a new application note on long term drift:

https://www.ti.com/lit/pdf/sbaa436

Greetings,

Rainer

Andreas:

--- Quote from: Grandchuck on April 22, 2021, 11:38:44 am ---It is in a ceramic package.

--- End quote ---

Hello,

it is pin-compatible to the LTC6655. And the data is also copied from the LT datasheet except for the supply voltage range which is better for the REF7025.
The large question is: how sensitive is the chip in the SMD package to FR4 board stress due to humidity.
With other LS8-packages (LT1236, LTC6655) I have always had not so good results as with CERDIP 8 packages. (AD586LQ)

with best regards

Andreas

ch_scr:

--- Quote from: Andreas on April 22, 2021, 06:13:16 pm ---
--- Quote from: Grandchuck on April 22, 2021, 11:38:44 am ---It is in a ceramic package.

--- End quote ---

Hello,

it is pin-compatible to the LTC6655. And the data is also copied from the LT datasheet except for the supply voltage range which is better for the REF7025.
The large question is: how sensitive is the chip in the SMD package to FR4 board stress due to humidity.
With other LS8-packages (LT1236, LTC6655) I have always had not so good results as with CERDIP 8 packages. (AD586LQ)

with best regards

Andreas

--- End quote ---
Hmm, shooting from the hip but: flex pcb interposer between LS8 and rest of the FR4 PCB?

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