ADC5140EVM-PDK: adc5140 with ap measurements,CODEC inside DOUT pin have no data

user6547614

Intellectual 340 points

Part Number: ADC5140EVM-PDK

hi sir,

with ap test,adc5140 board and ap about MCLK BCLK FRAME CLK is ok,BUT no data in CODEC DOUT pin

i check the gui config output enable,and input ended single signal with CODEC IN1P is right

but dout have no data?i don't know why?

whether there some register to write???

over 4 years ago

0 user6547614 over 4 years ago

Intellectual 340 points

no matter what ap with master or slave, CODEC inside IIS PIN,except DOUT no signal,others is ok,i test with oscilloscope.

0 user6547614 over 4 years ago

Intellectual 340 points

where? I saw your suggestion before, after I followed it, the clock is normal, the sampling rate is normal, but there is no data.

0 user6547614 over 4 years ago in reply to user6547614

Intellectual 340 points

I found another problem, that is, in the process of running the board, the loading was several times, and then it indicated that the valid I2C slave address could not be found

0 user6547614 over 4 years ago in reply to user6547614

Intellectual 340 points

i check the reference register,

CH1_CFG0,ASI_OUT_EN, ti's write ok,i dont why the DOUT PIN no data,

i am sure the hw connections is ok, if the wrong config, the clk is not valid..

0 user6547614 over 4 years ago in reply to user6547614

Intellectual 340 points

hi sir

we test the SNR with PPC3 sample 4CH single ended line input,the SNR about 98dB@1khz/20kbw with a-w

the same L/R SNR about 98dB

there is another case we test the high-level SNR??

0 user6547614 over 4 years ago in reply to user6547614

Intellectual 340 points

sir ,with diff signal,dre enable snr with 114db,dre disable snr with 108db

so how to improve SNR with 120db on spec define,and how to config PPC3 GUI ?

0 Zak Kaye over 4 years ago in reply to user6547614

TI__Mastermind 23050 points

Hi,

It sounds like you were able to resolve the majority of your issues and now have the correct data format. To measure datasheet performance you need to recreate the datasheet test conditions:

TA = 25°C, AVDD = 3.3 V, IOVDD = 3.3 V, fIN = 1-kHz sinusoidal signal, fS = 48 kHz, 32-bit audio data, BCLK = 256 × fS, TDM slave mode, PLL on (unless otherwise noted)

IN1 differential input selected and AC signal shorted to ground, DRE enabled (DRE_LVL = –36 dB, DRE_MAXGAIN = 24 dB), 2.5-kΩ input impedance selection.

It is best to measure the noise floor with the differential inputs shorted together and AC coupled to GND.

Best,

Zak