PCM1840: Usage as single-end input

Kuramochi Tadahiko

Guru 28715 points

Part Number: PCM1840
Other Parts Discussed in Thread: PCM1802

Hi,

My customer is considering using PCM1840 with single-end input.

Signals are inputted to INxP pins.

In this case, how should we terminate each INxM pin?

Best Regards,

Kuramochi

over 4 years ago

0 Zak Kaye over 4 years ago

TI__Mastermind 23050 points

Hi Kuramochi-san,

It is strongly recommended not to drive PCM1840 single-ended. This is because it is necessary for the common-mode input of the device to remain within very tight tolerance and if you try to drive it single-ended the common-mode input will vary significantly and potentially cause significant distortion.

If you want a high performance converter with single-ended input I would consider PCM1802 instead.

Best,

Zak

0 Kuramochi Tadahiko over 4 years ago in reply to Zak Kaye

Guru 28715 points

Zak-san,

Thank you for your support.

How is the pseudo-differential input?

If it is okay, how should we connect each INxM pin?

Best Regards,

Kuramochi

0 Zak Kaye over 4 years ago in reply to Kuramochi Tadahiko

TI__Mastermind 23050 points

Hi Kuramochi-san,

PCM1840 needs to be driven differentially. Pseudo-differential still results in wide variations in common-mode.

Best,

Zak

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PCM1840: Usage as single-end input