PCM1690: Load Impedance

Hideki Hayashi1

Part Number: PCM1690

Hi team,

Customer design post LPF with the PCM1690 as Figure 40 shows (DC-coupled, D to S) .

In this case, in order to meet the load impedance requirements, they need to design LPF as satisfying

(R1+R2) > (1+0.9G)/(1+G)*15kΩ.

Is it correct?

Regards,

Hideki

0 Paul_Frost over 4 years ago

Hi Hideki-san,

You are correct. The DC-coupled load must be less than 15kΩ.

Thanks,

Paul

0 Hideki Hayashi1 over 4 years ago in reply to Paul_Frost

Hi Paul,

What I want to make sure is how to calculate the DC-coupled load in the figure 40.

Is the inequality I wrote correct?

Regards,

Hideki

0 Paul_Frost over 4 years ago in reply to Hideki Hayashi1

Hi Hideki,

From my understanding, you can just use (R1+R2)<15kΩ.

Thanks,

Paul

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