PCM1809: The Difference Between Single-Ended and Differential Inputs

Ryu Yamashita

Part Number: PCM1809

Hi team,

Why is there only a 2dB difference in dynamic range between single-ended and differential inputs with the PCM1809, yet a 6dB difference at the output?
How is this calculated?

Best Regards,
Ryu.

1 month ago

+1 Garret Godfrey 1 month ago

TI__Expert 5645 points

Hi Ryu,

This device does not differentiate between differential and single-ended signals - there is no single-ended "mode". Thus, the single-ended performance measurements are taken with the input scaled by 6dB to 0dBFS - the same full-scale as differential. This is mentioned on page 8 of the datasheet. However, the differential dynamic range is still slightly higher as differential signals are better for noise rejection than single-ended.

Best,

Garret

0 Ryu Yamashita 27 days ago in reply to Garret Godfrey

Genius 3995 points

Hi Garret,

Understood.
If possible, I would appreciate it if you could clearly state on the top page that the notation is based on 0dB, among other things.

Best Regards,
Ryu.

+1 Garret Godfrey 26 days ago in reply to Ryu Yamashita

TI__Expert 5645 points

Hi Ryu,

We currently have this datasheet update in our queue.

Best,

Garret

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PCM1809: The Difference Between Single-Ended and Differential Inputs