c55x | AIC23 audio codec

Hello, I want to confirm that the AIC23 audio codec has a sampling resolution of only 16 bits. It is capable of 16,20,24,32 -bit data transfer rate, but the sampling resolution is only 16 bits. I do not see anything clearly mentioned on the spec provided by TI. It would be great if you can point me to some document that can give me more information about this. Thanks, Meenakshi.

I was helping Meenakshi with this and I have to admit it's a little strange. TI seemed to put out press releases implying 32-bit resolution -- which would be a first for any audio codec I know: http://64.233.187.104/search?qhe:BcT9rEBKHPYJ:www.powerdesign365.com/DC_DC_converter/Article25120.aspx+AIC23+resolution&hl=en but the SNR and dynamic range figures are in the 90 dB range, which of course implies 16-bits. We're pretty sure it's 16-bit because of the dB performance figures, but I'm just curious if anyone knows of any TI documentation in which their marketing personnel just come out and say "16-bit resolution" without trying to slip something by the press. -Jeff Meenakshi Matai wrote: > > Hello, > > I want to confirm that the AIC23 audio codec has a sampling resolution > of only 16 bits. > It is capable of 16,20,24,32 -bit data transfer rate, but the sampling > resolution is only 16 bits. I do not see anything clearly mentioned on > the spec provided by TI. > It would be great if you can point me to some document that can give me > more information about this. > > Thanks, > Meenakshi.

Hi Bhooshan- > As far as i can see the codec has a configurable resolution of 24 bits > (only) and can handle data transfer of 16,20,24 and 32. So am not sure > where this info about 32 bits resolution comes from. > > May be your talking about the older version of AIC23? > > One TI webpage says TLV320AIC23 is not recommended for new design > anymore and that TLV320AIC23B has replaced it. You might wanna check > that out too. TI's page for the B version indicates 90 dB for the ADC so doubt that ADC is anything more than 16 bits. Maybe "24-bit resolution" applies only to the DAC, for which they spec 100 dB SNR. The B version is not on the DSK 5510 board though, which is where Meenakshi's question came from. -Jeff > Link1: http://www-s.ti.com/sc/ds/tlv320aic23b.pdf > Link2 http://focus.ti.com/docs/prod/folders/print/tlv320aic23b.html > Link3(old version) : > http://www.tij.co.jp/jsc/docs/msp/da/products/pdf/tlv320aic23.pdf > > Link4:http://www.depeca.uah.es/wwwnueva/docencia/ING-ECA/seda/laboratorio/practDSPs1/DSK_6713.pdf > > Link5: http://www-k.ext.ti.com/SRVS/CGI-BIN/WEBCGI.EXE/,/?St"7,E00000000000384836,K63,Sxi=3,Case=obj(39584) > > --Bhooshan > > On Wed, 26 Jan 2005 08:17:02 -0600, Jeff Brower <> wrote: > > > > I was helping Meenakshi with this and I have to admit it's a little strange. > > TI > > seemed to put out press releases implying 32-bit resolution -- which would > > be a first > > for any audio codec I know: > > > > > > http://64.233.187.104/search?qhe:BcT9rEBKHPYJ:www.powerdesign365.com/DC_DC_converter/Article25120.aspx+AIC23+resolution&hl=en > > > > but the SNR and dynamic range figures are in the 90 dB range, which of > > course implies > > 16-bits. > > > > We're pretty sure it's 16-bit because of the dB performance figures, but I'm > > just > > curious if anyone knows of any TI documentation in which their marketing > > personnel > > just come out and say "16-bit resolution" without trying to slip something > > by the > > press. > > > > -Jeff > > > > > > > > Meenakshi Matai wrote: > > > > > > Hello, > > > > > > I want to confirm that the AIC23 audio codec has a sampling resolution > > > of only 16 bits. > > > It is capable of 16,20,24,32 -bit data transfer rate, but the sampling > > > resolution is only 16 bits. I do not see anything clearly mentioned on > > > the spec provided by TI. > > > It would be great if you can point me to some document that can give me > > > more information about this. > > > > > > Thanks, > > > Meenakshi.

Jeff- As far as i can see the codec has a configurable resolution of 24 bits (only) and can handle data transfer of 16,20,24 and 32. So am not sure where this info about 32 bits resolution comes from. May be your talking about the older version of AIC23? One TI webpage says TLV320AIC23 is not recommended for new design anymore and that TLV320AIC23B has replaced it. You might wanna check that out too. Link1: http://www-s.ti.com/sc/ds/tlv320aic23b.pdf Link2 http://focus.ti.com/docs/prod/folders/print/tlv320aic23b.html Link3(old version) : http://www.tij.co.jp/jsc/docs/msp/da/products/pdf/tlv320aic23.pdf Link4:http://www.depeca.uah.es/wwwnueva/docencia/ING-ECA/seda/laboratorio/practDSPs1/DSK_6713.pdf Link5: http://www-k.ext.ti.com/SRVS/CGI-BIN/WEBCGI.EXE/,/?St"7,E00000000000384836,K63,Sxi=3,Case=obj(39584) --Bhooshan On Wed, 26 Jan 2005 08:17:02 -0600, Jeff Brower <> wrote: > > I was helping Meenakshi with this and I have to admit it's a little strange. > TI > seemed to put out press releases implying 32-bit resolution -- which would > be a first > for any audio codec I know: > http://64.233.187.104/search?qhe:BcT9rEBKHPYJ:www.powerdesign365.com/DC_DC_converter/Article25120.aspx+AIC23+resolution&hl=en > > but the SNR and dynamic range figures are in the 90 dB range, which of > course implies > 16-bits. > > We're pretty sure it's 16-bit because of the dB performance figures, but I'm > just > curious if anyone knows of any TI documentation in which their marketing > personnel > just come out and say "16-bit resolution" without trying to slip something > by the > press. > > -Jeff > > Meenakshi Matai wrote: > > > > Hello, > > > > I want to confirm that the AIC23 audio codec has a sampling resolution > > of only 16 bits. > > It is capable of 16,20,24,32 -bit data transfer rate, but the sampling > > resolution is only 16 bits. I do not see anything clearly mentioned on > > the spec provided by TI. > > It would be great if you can point me to some document that can give me > > more information about this. > > > > Thanks, > > Meenakshi. > > To -- --------------------------- "I've missed more than 9000 shots in my career. I've lost almost 300 games. 26 times I've been trusted to take the game winning shot and missed. I've failed over and over again in my life. And that is why I succeed." -- Michael Jordan ---------------------------

Hi Meenakshi, Meenakshi Matai wrote: > I want to confirm that the AIC23 audio codec has a sampling > resolution of only 16 bits. From datasheet: "The analog-to-digital converters (ADCs) and digital-to-analog converters (DACs) within the TLV320AIC23B use multibit sigma-delta technology with integrated oversampling digital interpolation filters." Therefore it samples at least at 2 bits. As AIC23 incorporates sigma-delta ADC, then actual resolution does not matter. However, from datasheet, section 2.3.1 we see dynamic range to be 90dB. That makes about 15 bits ( 20 log(2^15)= 90.3 ). > It is capable of 16,20,24,32 -bit data transfer rate, but the > sampling resolution is only 16 bits. Sampling resolution is probably less, 2 or 4 bits sound reasonable. Some pages a quick google search turned up: http://www.beis.de/Elektronik/DeltaSigma/DeltaSigma.html http://www.analog.com/Analog_Root/static/techSupport/designTools/interactiveTools/sdtutorial/sdtutorial.html http://metrology.hut.fi/courses/s108-180/Luento9/sd.pdf http://www.intersil.com/data/an/AN9504.pdf Indrek -- Indrek Rebane | Borthwick-Pignon Electronics Engineer | Tartu Science Park Phone: (+372) 7 302 641 | Riia 185, 51014 Tartu Fax: (+372) 7 383 041 | Estonia | www.bps.co.ee

Indrek- > From datasheet: > > "The analog-to-digital converters (ADCs) and digital-to-analog > converters (DACs) within the TLV320AIC23B use multibit sigma-delta > technology with integrated oversampling digital interpolation filters." > > Therefore it samples at least at 2 bits. As AIC23 incorporates > sigma-delta ADC, then actual resolution does not matter. However, from > datasheet, section 2.3.1 we see dynamic range to be 90dB. That makes > about 15 bits ( 20 log(2^15)= 90.3 ). > > > It is capable of 16,20,24,32 -bit data transfer rate, but the > > sampling resolution is only 16 bits. > > Sampling resolution is probably less, 2 or 4 bits sound reasonable. On TI's web page for AIC23B they give a general spec of 24-bit resolution. For ADC specifically, they say 90 dB SNR, which -- as you point out -- might yield 15 bits. For DAC they say 100 dB SNR, or less than 17 bits. Although TI says 24-bit, I don't think the reality is even close to that. -Jeff

I'll check for documentation when I can. However, this codec is on the Spectrum Digital C5510 DSK. When I used it, I know the PCM samples were 16-bits. What I don't recall immediately is whether or not this lenght is configurable. The AIC23 is a stereo codec. Might there be confusion in that the L and R channel are cojoined to look like one 32-bit sample?? At Wednesday, 26 January 2005, Jeff Brower <> wrote: >I was helping Meenakshi with this and I have to admit it's a little strange. TI >seemed to put out press releases implying 32-bit resolution -- which would be a first >for any audio codec I know: > >http://64.233.187.104/search?qhe:BcT9rEBKHPYJ:www.powerdesign365. com/DC_DC_converter/Article25120.aspx+AIC23+resolution&hl=en > >but the SNR and dynamic range figures are in the 90 dB range, which of course implies >16-bits. > >We're pretty sure it's 16-bit because of the dB performance figures, but I'm just >curious if anyone knows of any TI documentation in which their marketing personnel >just come out and say "16-bit resolution" without trying to slip something by the >press. > >-Jeff > *snip* ---------------------------------- Zero Crossings, Inc. -- Embedded and Digital Signal Processing Systems http://www.zerocrossings.com/

Something to remember about sigma-delta ADCs, they do over sample (fs) and even their sample size is > 16-bits. However, by the time the codec formats the data to PCM, it is a lowly 16, 13, or 12 bits generally (although, I may be confusing the 13 and 12 for u-law and a-law companding). And PCM is what is output on the Dout pin. At Wednesday, 26 January 2005, Jeff Brower <> wrote: >Indrek- > >> From datasheet: >> >> "The analog-to-digital converters (ADCs) and digital-to-analog >> converters (DACs) within the TLV320AIC23B use multibit sigma-delta >> technology with integrated oversampling digital interpolation filters." >> >> Therefore it samples at least at 2 bits. As AIC23 incorporates >> sigma-delta ADC, then actual resolution does not matter. However, from >> datasheet, section 2.3.1 we see dynamic range to be 90dB. That makes >> about 15 bits ( 20 log(2^15)= 90.3 ). >> >> > It is capable of 16,20,24,32 -bit data transfer rate, but the >> > sampling resolution is only 16 bits. >> >> Sampling resolution is probably less, 2 or 4 bits sound reasonable. > *snip* ---------------------------------- Zero Crossings, Inc. -- Embedded and Digital Signal Processing Systems http://www.zerocrossings.com/

Harland- > I'll check for documentation when I can. However, this codec is on > the Spectrum Digital C5510 DSK. When I used it, I know the PCM samples > were 16-bits. What I don't recall immediately is whether or not this > lenght is configurable. The AIC23 is a stereo codec. Might there > be confusion in that the L and R channel are cojoined to look like > one 32-bit sample?? The older AIC23 (not B version) is on C5510 DSK. The B looks to have better specs and TI's web page is clear about the resolution -- 24 bits. So it really is supposed to provide a 24-bit sample per channel. But the SNR specs for ADC (90 dB) and DAC (100 dB) imply no more than 16 and 18 "usable" bits. -Jeff > > At Wednesday, 26 January 2005, Jeff Brower <> > wrote: > > >I was helping Meenakshi with this and I have to admit it's a little > strange. TI > >seemed to put out press releases implying 32-bit resolution -- which > would be a first > >for any audio codec I know: > > > >http://64.233.187.104/search?qhe:BcT9rEBKHPYJ:www.powerdesign365. > com/DC_DC_converter/Article25120.aspx+AIC23+resolution&hl=en > > > >but the SNR and dynamic range figures are in the 90 dB range, which > of course implies > >16-bits. > > > >We're pretty sure it's 16-bit because of the dB performance figures, > but I'm just > >curious if anyone knows of any TI documentation in which their marketing > personnel > >just come out and say "16-bit resolution" without trying to slip > something by the > >press. > > > >-Jeff > > > > *snip* > > ---------------------------------- > Zero Crossings, Inc. -- Embedded and Digital Signal Processing Systems > > http://www.zerocrossings.com/ >

AIC23 audio codec

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