PCM1809: Regarding Input Impedance

Ryu Yamashita

Part Number: PCM1809

Hi team,

The recommended input impedance is approximately 10 k ohm, but are there any guidelines regarding the minimum and maximum values?

Best Regards,
Ryu.

10 months ago

0 Lakshmi Narasimhan Badrinarayanan 10 months ago

TI__Genius 9050 points

Hi Yamashita-san,

The datasheet refers to the internal input impedance of the PCM1809 having a typical value of around 10kOhm.

Thanks and Regards,

Lakshmi Narasimhan

0 Ryu Yamashita 10 months ago in reply to Lakshmi Narasimhan Badrinarayanan

Genius 5150 points

Hi Lakshmi-san,

I understand that.
Because the audio signal level fluctuates depending on the input impedance value, I want to confirm whether that fluctuation falls within the acceptable range for input impedance.
Therefore, I would appreciate it if you could provide me with a rough estimate of the minimum and maximum values for the input impedance.

Best Regards,
Ryu.

+1 Lakshmi Narasimhan Badrinarayanan 10 months ago in reply to Ryu Yamashita

TI__Genius 9050 points

Hi Yamashita-san,

The impedance can have a variation of around +/-20%.

Thanks and Regards,

Lakshmi Narasimhan

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PCM1809: Regarding Input Impedance