AMC1211-Q1: AMC1211AQDWVQ1

Bincy VK

Part Number: AMC1211-Q1

Tool/software:

i am using AMC1211AQDWVQ1 part as analog isolator and i would like to add protection diode as BAS116 to input pin. do we have any restriction to add protection diode which is pulled up with +5v and one will be added as pull down with GND

can you please recommend

4 days ago

0 Clemens Ladisch 4 days ago

Guru 254380 points

The BAS116 is not a Schottky diode.

These are fine. If you want to limit the current through the internal clamping diodes, add a series resistor between the external ones and the pin.

0 Bincy VK 3 days ago in reply to Clemens Ladisch

Prodigy 10 points

Can you please rough connection. about this series resistor how to connect

0 Clemens Ladisch 3 days ago in reply to Bincy VK

Guru 254380 points

The resistor forces most of the clamping current to flow through the external diode.

0 Bincy VK 1 day ago in reply to Clemens Ladisch

Prodigy 10 points

Thank you for your response. do we have any specific value range for this resister

+1 Clemens Ladisch 1 day ago in reply to Bincy VK

Guru 254380 points

Even a small resistor like 50 Ω would prevent most of the current from flowing into the AMC.

The AMC has an input bias current of at most 15 nA, so even a large resistor like 10 kΩ would result in an error of 150 µV, which would be much smaller than the AMC's input offset error of 1.5 mV.

The resistor and the AMC's input capacitance form a low-pass filter, but it will not affect a 220 kHz signal.

Anything between, say, 100 Ω and 1 kΩ would be fine.

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AMC1211-Q1: AMC1211AQDWVQ1