TLV320AIC23B: What is the "real" resolution in bits of the ADC and DAC?

Michael Bishop

Part Number: TLV320AIC23B

The data sheet for the TLV320AIC23B says on page 1-1, "Data-transfer word lengths of 16, 20, 24, and 32 bits, with sample rates from 8 kHz to 96 kHz, are supported." I am wondering what the resolution of the ADC and DAC are. If the data-transfer word length is 32 bits, how many of those bits are "real" data bits from the ADC, and to the DAC? The SNR and dynamic range specifications suggest to me something like a 20-bit or 24-bit ADC and DAC.

over 2 years ago

0 pdjuandi over 2 years ago

TI__Mastermind 28815 points

Hi,

This codec is based on sigma delta modulator and the ENOB is tied to the Over-Sampling Ratio (OSR) relative to Nyquist.

An OSR of 4 will add 1 additional bit improvement, an OSR of 256 will add 4 bits improvement.

Regards,

Peter

0 Michael Bishop over 2 years ago in reply to pdjuandi

Prodigy 40 points

Peter,

I understand how oversampling adds bits. I am wondering what the total number of bits of resolution is for the TLV320AIC23B with an OSR of 256, not how many bits are added by the OSR of 256.

Michael Bishop

0 pdjuandi over 2 years ago in reply to Michael Bishop

TI__Mastermind 28815 points

Hi Michael,

Which DR/SNR do you use? If I take the 90dB for the ADC that gives about 15 bits.

Regards,

Peter

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TLV320AIC23B: What is the "real" resolution in bits of the ADC and DAC?