LMH1228: Swapping of +/- differential pins allowed on IN and OUT?

Sebastian Helbing

Part Number: LMH1228
Other Parts Discussed in Thread: LMH1297

Dear Team,

we are currently routing a layout with the LMH1228. The traces would run much smoother if we could exchange/swap the + and - pins of the differential interface: swap IN+ with IN0- and swap OUT0+ with OUT0-.

I'm pretty shure this is explained in the Programing Guide SNAU206 (as it is in SNAU204C for the LMH1297), thus I alreday requested it and I'm waiting for it ... however, a quick confirmation here, would help us in speeding up our design process.

Thank you very much for your support!

Best Regards,

Sebastian

over 3 years ago

0 Brian Zhou over 3 years ago

TI__Guru*** 145355 points

Sebastian:

This ticket was assigned and our engineer will respond soon.

0 Nasser Mohammadi over 3 years ago in reply to Brian Zhou

TI__Guru* 93670 points

Hi Sebastian,

Apologize for delay - please use link below to request this and other design related documents.

www.ti.com/.../LMH1228-DESIGN

In parallel, you can also send me a friend request along with your company email address.

Regards,Nasser

0 Sebastian Helbing over 3 years ago in reply to Nasser Mohammadi

Prodigy 150 points

Hi Nasser,

thank you very much for your help ... now I received the documents. And I still have a question regarding possible inversion. The Programming Guide talks about possible inversion of all outputs, no hint regarding input:

In case we deliver an inverted input signal on the pins IN0+/-, I could invert all outputs and everthing is fine again!? Is this understanding correct?

Best regards,

Sebastian

0 Nasser Mohammadi over 3 years ago in reply to Sebastian Helbing

TI__Guru* 93670 points

Hi Sebastian,

Yes your understanding is correct - you can swap P&N on input and then invert the polarity on output as noted in the programming guide. Typically this is done for ease of pcb layout.

Regards,Nasser

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LMH1228: Swapping of +/- differential pins allowed on IN and OUT?