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TLV320AIC3104: TLV320AIC3104 output abnormality

caiqin liu
Prodigy 30 points
Part Number: TLV320AIC3104

Tool/software:

When playing a 1KHz single sound source, the codec output waveform is as follows. Please help me find out what the reason is. Thank you.

  • 0 in reply to caiqin liu
    TI__Genius 12695 points

    Hi,

    I notice that your SPK1 and SPK2 may be connected incorrectly, RIGHT_LOM and RIGHT_LOP will be one (-) and (+) differential pair of line outs to SPK1, and LEFT_LOM and LEFT_LOP will be the pair to SPK2. Potentially your issue we are seeing is due to the scope/speaker trying to take a differential pair of two very similar signals.

    Let me know if switching these connections helps.

    Best,
    Mir

  • 0 in reply to Mir Jeffres
    Prodigy 30 points

    Are you saying there is something wrong with the testing method?

  • 0 in reply to caiqin liu
    TI__Genius 12695 points

    Hi,

    Your schematic looks to be connected incorrectly at the outputs. You confused L/R with P/M outputs. It may not be an easy fix with the measurements because of the filters you have. I drew out the lines showing which output goes to which speaker, note that blue=right output, and purple=left output:

    Let me know if this fixes your issue.

    Best,
    Mir

  • 0 in reply to Mir Jeffres
    Prodigy 30 points

    hi，

        Please see the latest schematic diagram, the connection is correct，thanks!

  • 0 in reply to caiqin liu
    TI__Genius 12695 points

    Hi,

    This looks better! Let me know if you are still having issues with the device.

    Best,
    Mir

  • 0 in reply to Mir Jeffres
    Prodigy 30 points

    HI,

    The schematic diagram has always been correct. The one uploaded earlier may not look clear because the signal was not pulled apart, but the problem has always existed. Please help me continue to analyze it. Thank you!

         

  • 0 in reply to caiqin liu
    TI__Genius 12695 points

    Hi,

    Okay, we can figure this out. Can you also attach your i2c config or register dump?

    Thanks,
    Mir

  • 0 in reply to Mir Jeffres
    Prodigy 30 points 

         0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
00: 00 00 00 91 20 1e 00 0a 00 20 00 01 00 00 00 20    ...? ?.?. .?... 
10: 20 ff ff 00 78 78 00 78 78 06 00 fe 00 00 fe 00     ...xx.xx?.?..?.
20: 00 00 00 00 00 c0 00 00 40 00 00 0a 0a 2f 2f af    .....?..@..??//?
30: 00 00 00 0f 2f 2f af 00 00 00 0f 00 00 00 2f 2f    ...?//?...?...//
40: af 0f 00 00 00 2f 2f af 0f 2f 2f af 2f 2f af 0b    ??...//??//?//??
50: 2f 2f af 00 00 00 0b 00 00 00 2f 2f af 0b fe 0c    //?...?...//????
60: 00 00 00 00 00 00 02 00 00 00 00 00 00 00 00 00    ......?.........
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
80: 00 00 00 91 20 1e 00 0a 00 20 00 01 00 00 00 20    ...? ?.?. .?... 
90: 20 ff ff 00 78 78 00 78 78 06 00 fe 00 00 fe 00     ...xx.xx?.?..?.
a0: 00 00 00 00 00 c0 00 00 40 00 00 0a 0a 2f 2f af    .....?..@..??//?
b0: 00 00 00 0f 2f 2f af 00 00 00 0f 00 00 00 2f 2f    ...?//?...?...//
c0: af 0f 00 00 00 2f 2f af 0f 2f 2f af 2f 2f af 0b    ??...//??//?//??
d0: 2f 2f af 00 00 00 0b 00 00 00 2f 2f af 0b fe 0c    //?...?...//????
e0: 00 00 00 00 00 00 02 00 00 00 00 00 00 00 00 00    ......?.........
f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

  • 0 in reply to caiqin liu
    TI__Genius 12695 points

    Hi,

    Give me a day to look at this, sorry about the delay.

    -Mir

  • 0 in reply to Mir Jeffres
    TI__Genius 12695 points

    Hi, 

    I looked at the register dump, I do not see anything obviously wrong. Can you show where you are measuring this output, and what are you sending to input to the device? Can you explain what the issue is?

    Best,
    Mir

    For reference, here is commented reg dump:

    03 91 #PLL enabled, q=2, p=1
04 20 #J = 8
05 1e #111 1000 0000 = D= 1920
07 0a #left dac plays left channel data, right dac plays right channel data
09 20 #i2s mode, 24 bits
0b 01 #r=1
0f 20 #left adc pga is not muted, gain=16dB
10 20 #right adc pga is not muted, gain=16dB
11 ff #mic2l is not connected, mic2r/line2r not connected to left adc pga
12 ff #lic2l/line2l, mic2r/line2r is not connected to right adc pga
15 78 #mic1rp/line1rp is single ended mode, line1r is not connectred to left adc pga
16 00 #mic1rp/line1rp is single ended mode, level control gain =0dB, line1r is conected to right adc pga, powered down
18 78 #mic1lp/line1lp is single ended mode, line1l is not connected to right adc pga
19 06 #micbias output powered down
1a 00 #agc disabled
1b fe #default max gain for l agc
1e fe #default max gain for r agc
25 c0 #left and right dac powered up
28 40 #output common mode voltage = 1.5V
2b 0a #left dac channel not muted, gain = -5dB
2c 0a #right dac chanel not muted, gain = -5dB
2d 2f #reserved
2e 2f #pga_L not routed to hplout
2f af #DAC_L1 is routed to HPLOUT, volume control = 010 1111
33 0f #HPLOUT level control=0dB,not muted, fully powered up
35 2f #PGA_L is not routed to HPLCOM
36 af #DAC_L1 is routed to HPLCOM, volume ctrl = 010 1111
3a 0f #HPLCOM level control = 0dB, not muted, fully powered up
3f 2f #PGA_R is not routed to HPROUT
40 af #DAC_R1 is routed to HPROUT, volume ctrl = 010 1111
41 0f #HPROUT level = 0dB, not muted, fully powered up
46 2f #PGA_R is not routed to HPRCOM
47 af #DAC_R1 is routed to HPRCOM, volume control = 010 1111
48 0f #HPRCOM level = 0dB, not muted, fully powered up
51 2f #PGA_L not routed to left lop/m
52 af #DAC_L1 is routed to LEFT_LOP/M, volume control = 010 1111
56 0b #left_lop/m output level = 0dB, not muted, fully powered up
5b 2f #pga_r not routed to right lop/m
5c af #DAC_R1 is routed to right_lop/m, volume control = 010 1111
5d 0b #RIGHT_LOP/M level = 0dB, not muted, fully powered up
5e fe #l+r dac fully powered up, l+r lop/m fully powered up, hpl/hprout fully powered up
5f 0c #hpl+hprcom fully powered up