• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 31 subscribers
  • Views 500 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

PCM4202: About use for single end input

Tao_2199
Genius 5840 points

Part Number: PCM4202
Other Parts Discussed in Thread: PCM1861

Hello,

 Regarding to PCM4202, my customer is asking a question.

They will replace to PCM4202 from AK5359.

AK5359 is single end input but PCM4202 is deferential input.

(Question)

Can PCM4202 use for single end input?

( VIN- (L/R) connect to AGND and VCOM(L/R) isn’t connected.)

They understand concern as following.

･Full scale is reduced to half.

･More effect to common mode noise.

Is there other problem or concern?

 

Due to replace device, they can’t add input buffer and matching device will be PCM4202 only.

(24bit/Fs:192K,H/W control)

Is there other recommend device (single end input) for replace?

 

Regards,

Tao_2199

  • 0
    TI__Mastermind 23050 points

    Hi Tao,

    PCM4202 should not be driven single-ended as you have described. It is important for this device to maintain the common-mode input at VCOM and it is intended that the driver will bias the inputs to match the VCOM voltage that the inputs are internally biased to. 

    Perhaps you can help me understand why they are looking to move to PCM4202 and why they are unable to add a buffer? PCM4202 is a much higher performance device than AK5359, so if they want to use it as a performance upgrade they will need to make sure the inputs are properly driven to see the performance benefits. 

    If they do not need quite the level of performance of the PCM4202, then I think PCM1861 would be a good option. This is also a hardware controlled ADC that supports 24-bit, 192kHz operation with an SNR of 110dB and single-ended inputs. There is a PGA input stage so there is no need for a driver on the input!

    Best,

    Zak