LM98714: Is there Amplifier required for OS pin?

Ting Ye

Genius 11800 points

Part Number: LM98714

Hello Team,

Figure 8. Typical AFE/CCD Interface shows a common collector circuit is used.

May I confirm that there is no need to add an amplifier for the OS pin because OS pin internally has a PGA?

Thank you.

Regards,

Ting

over 6 years ago

0 Aaron Goodson over 6 years ago

TI__Expert 6330 points

Hi Ting,

I have notified our expert regarding this topic. Please expect a response by 3/25/19.

Thanks,
Aaron

0 Costin Cazana over 6 years ago

TI__Expert 4940 points

Hi Ting,

That's no need to add an amplifier, figure 8 is an example of the AC coupling. The AC coupling will center the input around VCLP, this is important in sample and hold mode. For CCD type the AC is needed just for the common mode voltage. If needed in sample hold mode of operation and internal source follower can be added.
You can find a detailed description in data sheet 7.3 section

Regards,
Costin

0 Ting Ye over 6 years ago in reply to Costin Cazana

TI__Genius 11800 points

Hello Costin, Hello Aaron,

Thank you for helping!

Regards,
Ting

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LM98714: Is there Amplifier required for OS pin?