Quires & problems regarding TI's Value Sound Bar Reference Kit

Avijit Dutta77485

Prodigy 230 points

Other Parts Discussed in Thread: PCM3070

Dear All,

I have this Value Sound Bar Reference Design Kit with me & I have some problem to solve.

1) SUB-OUT is not working on the board. I checked the board but R91,R93 both registers were connected.

Can any one suggest anything for it?

2) The board is working fine but when ever I try to measure output using dummy load & placing CRO probes all I can find is some disturbing waveform .

To check it further I connect a pair of speaker & give sine input but I was amazed to find that the output is Sounding well through the speakers.

I tried my measurements by placed ground pin to C72's negative point. Please tell me where I am making my mistake.

Thanks

over 14 years ago

0 Don Dapkus over 14 years ago

TI__Guru**** 189401 points

Hi, Avijit,

In order to use the sub-out, you need to program it. Please see this link: http://e2e.ti.com/support/data_converters/audio_converters/f/64/p/146430/529378.aspx#529378

2) Welcome to the WONDERFUL world of class-D amplifiers. Please view my attempt at being a Hollywood star: http://focus.ti.com/general/docs/video/Portal.tsp?langId=en&entryid=0_lwy0mk5r

-d2

0 Avijit Dutta77485 over 14 years ago in reply to Don Dapkus

Prodigy 230 points

Thanks Don,

I had seen some part of your vedio about " how to measure output at filterless Class-D amps" on TI site. But one question still to ask is that , I am still unable to see proper sinewave at the output or even input of PCM3070 (i.e. Analog i/p,o/p). Why that so? Are there anything else to rectify? Please suggest.

Thanks & Regards,

Avijit

0 Don Dapkus over 14 years ago in reply to Avijit Dutta77485

TI__Guru**** 189401 points

Avijit,

What do you see? Can you post some scope shots?

-d2

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Quires & problems regarding TI's Value Sound Bar Reference Kit