TLV9362-Q1: Question about INPUT IMPEDANCE

Leo Ma

Expert 4196 points

Part Number: TLV9362-Q1
Other Parts Discussed in Thread: OPA928

Tool/software:

Hi Expert,

Have a nice day!

Could you share schematic of the "INPUT IMPEDANCE"? Or any other files explain on this feature.

Thanks!

Best Regards,

Leo

over 1 year ago

0 Raymond Zhang1 over 1 year ago

TI__Guru* 77501 points

Hi Leo

Leo Ma said:
Could you share schematic of the "INPUT IMPEDANCE"?

TLV9362-Q1's equivalent input CMOS topology should look like the following, and this op amp is designed in CMOS topology.

The input impedance figure is shown in your attached image.

If you have other questions, please let me know.

Best,

Raymond

0 Leo Ma over 1 year ago in reply to Raymond Zhang1

TI__Expert 4196 points

Hi Raymond,

Thanks for reply.

So, what is the difference between ZID and ZICM?

Are they similar like this schematic of OPA928?

Best Regards,

Leo Ma

0 Raymond Zhang1 over 1 year ago in reply to Leo Ma

TI__Guru* 77501 points

Hi Leo,

Leo Ma said:
Are they similar like this schematic of OPA928?

Z refers to impedance. ID may refer to input differential input impedance and ICM May refer to input common mode impedance.

The impedance figures are wrong, Zid should be measured between the input terminals and Zicm should be measured with respect to GND. Same as differential and common mode capacitance values.

e2e.ti.com/.../input-capacitance-common-mode-differential-huh

If you have other questions, please let me know.

Best,

Raymond

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TLV9362-Q1: Question about INPUT IMPEDANCE