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PCM1863: PCM1863 CMRR

Intellectual 280 points

Replies: 3

Views: 224

Part Number: PCM1863

We have a product of audio processor in small batch trial production, but the current PCM1863 used in the product does not pass the CMRR in production test. CMRR is required to be above 40 dB. The typical CMRR value of PCM1863 given in specifications is 56 dB. However, in actual test, the CMRR value of some prototypes is 34-40 dB (trial production of 30 pcs, 6 pcs appears this situation). The test is done by AP tester, please help see what causes this situation? What's the solution?

3 Replies

  • Hi Jace,

    Can you please help me w more details of the test conditions under which you measure lower CMRR? Thanks.

    Best regards,
    Ravi

  • In reply to Ravi Patil:

    We use AP tester and input signal test of 1kHz and 2V rms.

  • In reply to Jace Chen:

    Thanks for sharing the setup details. I am not sure why we are measuring the lower value and will consult w my team member and will get back to you w details regarding the possible root cause and solution. Thanks.

    Best regards,
    Ravi

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