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v1.3.2 DAC8831IBD noise #119

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MorganTL opened this issue Jul 18, 2024 · 4 comments
Open

v1.3.2 DAC8831IBD noise #119

MorganTL opened this issue Jul 18, 2024 · 4 comments

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@MorganTL
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The DAC output is very noisy on both channel when using DAC8831IBD. The issue is fixed after replacing the DAC8831IBD with AD5542ABCPZ-REEL7

Test setup

  • Connect 1Vpp sine wave to ADC and oscilloscope blue channel using T splitter
  • Connect DAC to oscilloscope yellow channel
  • With the ff2c2c1 firmware from quartiq/stabilizer

Result With DAC8831IBD

noisy

Result after replacing DAC8831IBD with AD5542ABCPZ-REEL7

clean

Related issue

#107
@gkasprow
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DAC8831IBD was used due to component shortages

@gkasprow
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Noise may be caused also by SPI timing issues

@MorganTL MorganTL mentioned this issue Jul 22, 2024
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@sbourdeauducq
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DAC8831IBD was used due to component shortages

@gkasprow Do you remember if it was tested and how?

@gkasprow
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it passes our automated test. But the test is not very detailed and checks mainly assembly

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@sbourdeauducq @gkasprow @MorganTL