ADAU1787-ADC SNR/THD+N/Dynamic Range

SigmaDSP & SigmaStudio ADIApproved Apr 27, 2020 00:00 2 replies Original on forum ↗

ICs: ADAU1787

ADIApproved Question

Apr 27, 2020 00:00

Hi there,

Recently I have test the ADAU1787 SNR/THD+N/Dynamic Range,

I used Audio Precision 2722 to generat a AC siganl of sinuosidal 1kHz, and added it at AIN0 input pin.

Meanwhile, I configrued the register in SigmaStudio.

When I saw the output signal as I2s signal, I began my test.

The SNR/THD+N/Dynamic Range was calculated by AP2722 and I got some results seen as below:

datasheet
test results

PGA OFF
Dynamic Range
A-W.
97
94.12
dB@1kHz
PGAx_EN = 0, PGAx_BOOST = 0

Flat
94
89.97
dB@1kHz

THD+N Level
A-W.
-90
-90.17
dBFS@1kHz

Flat
-87.65
dBFS@1kHz

SNR
A-W.
98
93.41
dB@1kHz

Flat
96
87.87
dB@1kHz

The test results of Flat filter is smaller than datasheet for about 6dB, so if it is possible please help me to figure it out.

Thanks,

Ashley

ADAU1787

Integrated/Special Purpose A/D Converters

Audio CODECs

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JellenieR Reply

Apr 29, 2020 00:00

Hi,

I am moving this thread to its proper community https://ez.analog.com/dsp/sigmadsp/. Someone here may be able to assist you.

Thanks,

Jellenie

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winvic Reply

Mar 9, 2021 00:00

Hi Ashley,

I am new on ADAU1787 ? Now i want get an I2S output on the board, the pipeline should be AIN0-->ADC-->I2S, can you please let me know how can i config the registers in SigmaStudio? Do i need draw a schematic ?

Thanks, Winvic

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