LMX2820: What is the purpose of all the 0 ohm resistors on the LMX2820 demo boar

mike leggett

Part Number: LMX2820

What is the purpose of all the 0 ohm resistors on the LMX2820 demo board giving the impression that one might want to isolate these inputs.Please confirm or not if all the various Vcc bias pins on the LMX2820 are connected to one another internally. Please confirm that some of these jumpers can or cannot be removed to power down unused resources in the LMX2820 to save power. What is TI's intended purpose of the jumpers? Thanks, Mike

over 4 years ago

+1 Noel Fung over 4 years ago

TI__Guru** 108550 points

Hi Mike,

They are useful if you want to measure the current drawn at each power supply pin. In real application, you do not need them.

0 mike leggett over 4 years ago

Prodigy 80 points

Can you advise it any of them can be grounded to power down resources that are not going to be used? Are they really independent supply inputs?

+1 Noel Fung over 4 years ago in reply to mike leggett

TI__Guru** 108550 points

Hi Mike,

All power supply pins have to be tied to a valid 3.3V supply source, even though if the device is not fully utilized.

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LMX2820: What is the purpose of all the 0 ohm resistors on the LMX2820 demo boar