Audio Converters

Forum Post: RE: PCM5102EVM-U : No function

Thomas Winkler — Wed, 22 May 2013 10:08:00 GMT

Hi Tim,

I do have exactly the same problem. Do you have any solution so far ?

Kind regards,

Thomas Winkler

Forum Post: RE: PCM9211 (S-PQFP-G48 package) IC Leg bend up spec

Tze Khong Yap — Wed, 22 May 2013 06:11:00 GMT

Hi Don,

Please kindly advise.

Sorry for urgency.

Yap

Forum Post: RE: set sampling frequency with AIC3204

Albert Torn�� — Tue, 21 May 2013 22:09:00 GMT

Is it possible that? or there are something that I just missed

Forum Post: RE: PCM2900 Linux ALSA driver information?

D. Hartl — Tue, 21 May 2013 20:15:00 GMT

The PCM2900 is a USB audio codec and therefore doesn't need an ALSA driver. It is compatible with USB audio and should work with a properly configured Linux kernel (that has USB class audio enabled).

Forum Post: RE: PurePath Studio (Home Audio) v5.95 Build 1 Rev. 20094 Problem

Andrew Gillham — Tue, 21 May 2013 17:22:00 GMT

I agree, revision 22035 (downloaded with the link posted by Dom above) works for me on Win7 on both x86 and amd64, but the version in the download location does not.

Forum Post: RE: Mic input noise with AIC3204 and AIC3254

J Arbona — Tue, 21 May 2013 15:54:00 GMT

Amit,

I suggest to tune the AGC using the EVM to get a 'feel' for the AGC controls in the GUI software, or connect the I2C lines of your target to the EVM I2C lines.

Regards,

J-

Forum Post: RE: PCM3070 and 8MHz clock-in

J Arbona — Tue, 21 May 2013 15:50:00 GMT

Hi Raul,

See examples below.

Using ALDO:

# Select Page 1
w 30 00 01
#
# Power up AVDD LDO
w 30 02 09
#
# Disable weak AVDD in presence of external
# AVDD supply
w 30 01 08
#
# Enable Master Analog Power Control
# Keep AVDD LDO powered
w 30 02 01

Not using ALDO:

# Select Page 1
w 30 00 01
#
# Disable weak AVDD in presence of external
# AVDD supply
w 30 01 08
#
# Enable Master Analog Power Control
w 30 02 00

Regards,

J-

Forum Post: PCM1795 / I/V and filter for 192kHz sampling

S.Satoshi — Tue, 21 May 2013 15:13:00 GMT

Hi,

Now our customer is designing their board by using PCM1795. And they are designing I/V and filter for 192kHz sampling with Vout=2Vrms for both PCM and DSD mode.

Can you prepare reference circuit of the three pair opamp for I/V and filter and external passive components ?

Best Regards,

Sonoki

Forum Post: RE: How flat is frequency response of PCM5102 ?

Debasish Deka — Tue, 21 May 2013 13:29:00 GMT

Oh,

Sorry for this mistake. What I need is :

1: Flatness of around 0.01dB in the passband region of 30Hz to 70kHz.

2. In the evaluation board for PCM51xx what is the role of SRC4392. The later's datasheet tells it supports a maximum sampling rate of of 216kHz. In that case how can one test 384kHz audio?

Thanks again,

Debasish

Forum Post: RE: PCM1792A

Glenn Fasnacht — Tue, 21 May 2013 13:06:00 GMT

Thanks Brian,

I understand the specs and high frequency noise is not a problem, I'm generating sines up to 80kHz and the high frequency noise is acceptable. The problem is noise below 20Hz.

If I program a DC output there is about 3mV/V of very low frequency random noise, with a 1/f distribution. I also see this riding on top of sine waves, again, about 3mV/V of amplitude. The frequency is far below the 20Hz hearing drop off, so most audio applications don't care, but mine is not an audio application and this noise is a problem for my product. My question is, is this truly a PCM1792A issue or do I have a circuit design and/or PCB layout issue?

Glenn Fasnacht

Forum Post: RE: audio chip

shani wolf — Tue, 21 May 2013 08:30:00 GMT

Hi Done,

Yes, I'm looking for an IC who does that without programing.

a device that can be programded on a HW mode.

10x

shani

Forum Post: RE: Linux device drivers for AIC31xx/DAC31xx/AIC325x/AIC320x/AIC326x/AIC321x

Don Dapkus — Tue, 21 May 2013 06:50:00 GMT

Thanks for posting this, Hari!

-d2

Forum Post: RE: AIC3254: Not reflect in the Flag register of "HPL powered up" even though the HPL PGA register was powered-down

Kato Motoki — Tue, 21 May 2013 05:07:00 GMT

Hi J,

I understood what you mentioned in previous post.

I mean that in order to detect the HPL power-down, the HPL flag will not use for this usage.

Best regards,

Kaka

Forum Post: RE: TAS3204 radiated noise at 135mhz (clock)

susan xu — Mon, 20 May 2013 14:37:00 GMT

David,

I am very sorry that we couldn't help on this issue. The HW person that's originally in charge of TAS3x is not with us anymore, so all the HW people I asked around are pretty much at the similar postion as you, if not the same, so all the suggestions they could give are general recommandation, they can't give anything very specific without knowing your HW design. I have also other information from other HW people, but I am not sure how helpful it could be for you, but I will put it here for your reference.

You mentioned 2 TAS3204 used in the system, what happens if you disable one of the TAS3204. Can you pass the C.E. with only one TAS3204 running?
What happens if you ground all the inputs? Do you still see peaks at 135MHz? Asking because you mentioned there are 10 RCA cables connected, not sure if it causes the issue, may try to remove all the cables and probably also ground the inputs? Do you use Op-Am’s following each RCA input jack? If not, please refer to the EVM schematics.
Is there other clocks in the system, say crystal for the system MCU? If so, what is the clock speed here, is 135MHz a harmonics of the MCU clock (say MCU CLK at 13.5MHz or 27MHz, etc.)?

I hope you could resolve this issue soon.

Regards,

Susan

Forum Post: RE: PCM9211 Configuration issue

Jacky Wang(QD) — Mon, 20 May 2013 14:27:00 GMT

Hi Sonu,

You can use the XTAL(PCM9211) to provide the clocks for PCM9211, thus PCM9211 ADC works in Master mode, if you want it in Slave mode, you must provide MCLK.

For MSP430 to generate the MCLK, you need a special crystal(e.g. 24.576MHz) on XTAL1 or XTAL2, configured them as MCLK/SMCLK for MSP430, then output them on dedicated GPIO, you can refer to MSP430 example codes to achieve this.

Thanks.

Forum Post: AIC3262 EVM, digital mic's and ANC algorithm from PurePath - is it possible?

Dmitriy Issaev — Mon, 20 May 2013 12:59:00 GMT

Hello!

I'm interested in realization of dual mic noise canceler. I learned that some of TI's codecs have DSP onboard and there is some IDE for that DSP, caled PurePath. That IDE have some NC algorithms based on adaptive filters. Moreover 2 PDM ( with sigma-delta output) digital mics could be connected somewhere in the middle of codec's ADS, between its own sigma-delta modulator, or instead of it, and decimating CIC filter. I'd like to purchase AIC3262 EVM to test provided ANC abilities. after registration I'v downloaded latest PPS.

questions:

1. how to configure codec's ADC to deal with digital mic's? I mean where to do that? it's seems like PPS only for miniDSP code developing.

2. with PPS trying build ANC code I have "resources exceed 100%" error. what's wrong? is it tested option for 3262?

Regards,

Dmitriy.

(Please visit the site to view this file)

Forum Post: RE: Is there any driver, as for, TLV320AIC1110 carried out Linux correspondence?

Hari Rajagopala — Mon, 20 May 2013 11:29:00 GMT

Hi,

Sorry. We have not developed any driver for the AIC1110 device.

Regards,

hari

Forum Post: RE: Can we expect 110dB dynamic range using the PCM4201?

hombrey escalante — Mon, 20 May 2013 10:26:00 GMT

I am currently trying to convert a single ended 1Khz 1Vpp sine with an -85dB THD using the PCM4201. After processing the digital signal, I am only able to get about -60dB THD.

I used the single ended to differential circuit suggested by the PCM4201 data sheet.

Using an external audio analyzer, it appears that the source of the extra signal distortion happens just at the differential inputs of the PCM4201. The analyzer's sine signal degrades to -40dB simply by tapping into the input pins. Is there anything i am doing wrong in my setup? (drawings attached)

Forum Post: RE: PCM270xC: Enable/Disable control for jack sense functionality

John Puskarich — Mon, 20 May 2013 03:58:00 GMT

No worries, Don. Might you point me to a simple USB audio chip that has jack sense functionality?

Forum Post: RE: AIC3101 Jack/Headset Detection

Geoff Pickford — Mon, 20 May 2013 01:13:00 GMT

Hello Don,

Thanks for such a fast and useful reply.

Regards,

Geoff