AMC3330: Single output

Liu Yang

Part Number: AMC3330

Hi Team,

The OPamp connected to output of AMC3330 is designed to single input.
Could you tell me how to connect the output pin OUTP/OUTN of AMC3330?
For example, are following 2 connections correct?

1)OUTP(11)/GND(9)
2)OUTP(11)/OUTN(10) but OUTN(10) and GND(9) is connected.

Beat Regards,
Tom Liu

over 3 years ago

0 kai klaas69 over 3 years ago

Guru 140200 points

Hi Tom,

do not connect one of the output pins of AMC3330 to ground ! The AMC3330 provides a true differential output which MUST be connected to a differential amplifier as shown in figure 8-3 of datasheet. The differential amplifier is necessary to suppress the internal switching noise and to guarantee a high common mode rejection.

Kai

+1 Tom Hendrick over 3 years ago

TI__Guru**** 181751 points

Hi Tom,

In addition to Kai's comments (Thank you Kai!), you would only get half the useable output range. Here is a Tech Note describing how to implement a differential output to single ended signal for our isolation amplifiers like the AMC3330. https://www.ti.com/lit/an/sbaa229/sbaa229.pdf

0 Huisheng Jia over 3 years ago in reply to kai klaas69

Prodigy 10 points

ご回答ありがとうございます。高いコモンモード拒否を保証するために必要ということですね

0 kai klaas69 over 3 years ago in reply to Huisheng Jia

Guru 140200 points

Huisheng Jia said:
ご回答ありがとうございます。高いコモンモード拒否を保証するために必要ということですね

means:

"Thank you for your reply. It's necessary to guarantee a high common mode rejection."

Kai

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AMC3330: Single output