TRF3722: specs in datasheet

Vincenzo Pizzolante

Part Number: TRF3722
Other Parts Discussed in Thread: TRF372017, DAC3484

hi,

with reference to TRF3722, Zin BB (baseband input impedance specification outlined in data sheet’s page 7), does it refer to differential or single ended?

thanks a lot in advance

Vincenzo

over 5 years ago

0 Vincenzo Pizzolante over 5 years ago

TI__Mastermind 25786 points

PS: idem for TRF372017, Zi (baseband input impedance) specification outlined in data sheet’s page 5, does it refer to differential or single ended ?

looking forward for a prompt answer

thnaks a lot in advance

Vincenzo

0 RJ Hopper over 5 years ago in reply to Vincenzo Pizzolante

TI__Mastermind 18095 points

Consider it differential impedance in both cases. --RJH

0 Vincenzo Pizzolante over 5 years ago in reply to RJ Hopper

TI__Mastermind 25786 points

hi Russell,

thanks. Just to be sure, root of the question relis on the mismatch between data on electrical table:

and fig.85 on pag. 33:

Which is the correct one?

thanks a lot in advance

Vincenzo

0 Kang Hsia over 5 years ago in reply to Vincenzo Pizzolante

TI__Guru* 79334 points

Hi,

If it helps, I have the following measured on the DAC3484/TRF372017 interface guide

https://www.ti.com/lit/ug/slua647a/slua647a.pdf?ts=1588693854955

-Kang

0 Vincenzo Pizzolante over 5 years ago in reply to Kang Hsia

TI__Mastermind 25786 points

hi Kang,

So may we conclude that Rin=5K and Cin=3pF is the differential input impedance, correct ?

thanks a lot in advance

Vicnenzo

0 Kang Hsia over 5 years ago in reply to Vincenzo Pizzolante

TI__Guru* 79334 points

Vincenzo,

I meant the measurement I made in the app note are the same as Figure 85 of the datasheet.

-Kang

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TRF3722: specs in datasheet