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ICL7652: Higher Voltage power rails

David C
Expert 3350 points
Part Number: ICL7652
Other Parts Discussed in Thread: TLC2652, , OPA189

Hello,

From customer:

I specify all the components that go inside multichip modules, a.k.a. hybrids. Depending on requirements I am looking for dice that can be industrial, automotive, military and space grade for these hybrids.

I currently use the TLC7652 for the application. But I need higher voltage power rails of +/- 15V. I noticed the ILC7652 says it is a +/-18 V power rail part in the selector guide. But then I pull the data sheet and that say +/-8 V. But it also says the inputs are +/- 16 V. something is way wrong with that picture. What is truth? Since both parts are built on the LINCMOS line can I expect similar radiation performance from the ilc7652 as the TLC2652?

So I need the TLC 2652 radiation tolerance, DC precision, GB, slew rate, but in a +/-15V power rail part. In part of the application, for power saving I’d like to also be able to run it off of single power rail of +15V.

Regards,

David

  • 0
    TI__Guru* 93105 points

    Hi David,

    The TLC2652 and ICL7652 have an absolute maximum supply rating of +/-8 V. The intended supply is +/-5 V and the Electrical Characteristics tables are written around this supply; however, according to the Recommended Operating Conditions table they may be used with supplies from +/-1.9 V to +/-8 V. The Absolute Maximum differential input voltage VID is +/-16 V which is an indicator of the maximum differential voltage may be applied across the inputs without damaging the device. It s more of a "torture test" specification and not an indicator of maximum supply voltage.

    The TLC2652 is a 30 year old chopper op amp. It has incredibly low voltage offset and offset drift, but its other electrical performances aren't equally stellar relative to its operating current.  Also there is the need for single +15 V operation which is more readily accommodated by modern chopper op amps.  

    The lowest voltage offset/ voltage offset drift, modern chopper op amp TI Precision offers is the OPA189. It's maximum voltage offset is 3 uV, with a typical of 0.4 uV (TA 25 °C), and its drift is specified as ±0.005 µV/°C (typ), ±0.02 µV/°C (max). Its unity gain bandwidth is 8 MHz, slew rate 20 V/us, and has a typical quiescent current of 1.5 mA. The OPA189 doesn't require the external CXA and CXB capacitors specified for the TLC2652. We don't conduct radiation tolerance testing but like the TLC2652 the OPA189 is processed on a CMOS process, albeit different ones.

    You can find the OPA189 datasheet here:

    Regards, Thomas

    Precision Amplifiers Applications Engineering 

  • 0 in reply to Thomas Kuehl
    TI__Genius 11135 points
    David

    We haven't heard back from you so we assume this answered your question. If you need more assistance just post another reply below.

    Thanks
    Dennis