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Part Number: TLV320AIC3106EVM-K
I have procured an evaluation board of Tlv320aic3106.
I will be attaching a coil mic to it and expect to sample at a rate of 8kHz. I have checked the output range of my coil mic (2mV to 10mV) Vpp.AUDIO CODEC DATA ANALYSIS.docxClick here to play this audio clipClick here to play this audio clipI acquired samples (sound recorder in Windows 7) using PC in .wav format.following were my configurations for codec to capture inputMIC3R input on audio codec (LADC active) Level (attenuation set to 0db)PGA set to 0db
Sampling freq default 44.1kHz
and fed following range (3mV to 500mV) 1kHz tones.On analyzing the captured input. Results attached ....I can receive 50mV with wave shape maintained as shown in doc ..... below 50mV inputs waveshape looks unrecognizable negative swing missing....Applying 500mV gives a clear swing, for lower voltages (below 50mV) no much negative swing seen....For 500mV SINAD is lowI tried applying PGA of 20dB to lower voltages 3mV to 50mV here to lower voltages though receive higher amplitude has no tone content for voltages below 50mV.
I later modified the input with low pass filter of 4kHz bandwidth but of no use.I am unable to identify what is the issue. Is this noise inherent at chip input?? Chip data sheet points to a dynamic range of 91db.Is it board induced noise overcoming weak input signals.?? Does it mean I need to amplify the signal before sending to codec??
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In reply to Steve-Wilson:
How to capturevregister configuration??..... yes i an acquiring audio using USB
In reply to Rakesh Muralidharan:
As you said there was an issue with the setup,test results for Ti(1).xlsx the ground connection was flimsy . Now I have resolved the issue and captured data.
Data sheet claims to offer dynamic range of 91db. Attached is my result.
What is the level for full scale?? is it 200mVp-p.
during my observation from test result 3660.test results for Ti(1).xlsx i could observe a drop in SINAD for input voltages above 200mV. This as i understand is due to increase in harmonic components. upto 200mV SINAD was good.
how to obtain the aforesaid dynamic range. If i consider 200mV as my distortion less peak signal my dynamic range is about 70dB. There is still plenty of room for improvement.
PLease let me know the fullscale for codec and reason for distortion above 200mV is it expected?? Please let me know
A gentle reminder
How can I access the configured register value from EVM using GUI (aic310x)??. We could not find a means to capture the register values using GUI.
All the configuration I am initiating through GUI. Will the screen shots of GUI do ??or is there a means to dump register values??
Please let me know method to dump configured register values from EVM's audio codec.
The only way to read registers in the AIC310x GUI is to go to the command line interface tab and manually read. The "read data" then displays the register writes, however the first four numbers in the read data are ignored.
I want to read the first 32 registers
write "r 30 00 20" in the command buffer, and click execute command buffer:
lets start with the first 32 registers, and go from there.
Audio Codec Analysis Report_draft_v1.docxHello Steve,
This is Satheesh from C-DAC Trivandrum. Right now I am looking into the configuration aspects of the audio codec. I do have a doubt related to the achievable dynamic range in the codec. The expiremental set-up, register configurations, obtained results as well as the specific query is in the inserted doc. Kindly reply.
In reply to satheesh kumar32:
Satheesh Kumar S
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