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TAS6421-Q1: TAS6421-Q1

VICTOR BEST
Intellectual 350 points
Part Number: TAS6421-Q1
Other Parts Discussed in Thread: TPA3118D2EVM, PCM1808-Q1

I have now ordered an evaluation boards and a number of TAS6421. I want a robust way to convert my analogue data to digital for the TAS6421, it will need to operate between 125'C and 150'C. devices on the EVAL Board seem to not quite go that high, any ideas? Thanks in advance for your help.

Victor Best

  • 0
    Intellectual 350 points

    I can see that the TI A/D PCM1808-Q1 will operate to 125'C, we are always going to struggle to get to 150'C.  But, given that i was advised that the TAS6421 had better thermal performance i did not expect to be presented with another major stubling block so soon.  I was hoping you technical wizard might have been able to help me out of this situation.  It would seem i have jumped from the frying pan into the fire?  Has moving to the TAS6421 been a retrograde, as at least before we stood some chane to get to 150'C, unfortunaly i have just cancelled order for the TPA3118D2EVM ?

    Designing conversion circuits to operate at temperatures 125'C was never going to be easy, but i was rather hoping that the TAS6421 was going to be rather more benefit, now i have to first design a circuit to program a power up sequence for the PVDD and VBAT again this will have to operate at 125'C to 150'C and work for all load conditions, then i need a simple A/D converter that will work when hot..this is actually non -trivial, given it will mostly be descrete components, and the beta of the transistors have all headed south.really could do with a bit of help on this bit? 

  • 0 in reply to VICTOR BEST
    TI__Mastermind 34235 points

    Hi Victor,

    Designing anything for high-temp can be difficult.  The audio amplifier will be no exception. You need to look at the over temperature warnings and over temperature shutdown to make sure you will not trigger a shutdown under high power conditions at high temperature. 

    I have also sent this thread to an ADC engineer for his input. 

    Stay tuned..