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  • Forum Post: TPS65950/30: Multiple system clock sources

    Gandhar Dighe
    Q: Can this device work with multiple system clock sources? Generally used for wireless applications (one source for modem and one for TPS65950/30). A: No. If different clock sources are used then there will be drift in audio. To avoid this there should be a single clock source.
    on Feb 23, 2009

  • Forum Post: USB audio synchronization

    Wade VonBergen
    I have a customer who is trying to understand the mechanisms in place to syncronize USB audio. His design requires that the 1ms USB frames to be syncronized to an external clock. In review of the TRM, several questions have arised related to trying to determine this. One option that was discussed...
    on Apr 23, 2009

  • Forum Post: TPS65950/30: Audio power up sequence

    Gandhar Dighe
    Please follow the power-up sequence mentioned in the TRM. In general following is the recommendation: First set the path, then gains and then start the analog output. Following is the observation on one of the customer platforms, other setting being common to both: - if they enable I2S first -...
    on Apr 23, 2009

  • Forum Post: TWL5030: Output routing, analog mic routing question

    Pascal MAREAU
    This has been bugging me for a long time: In registers: Output: EAR_CTL, HS_SEL, PREDL_CTL, PREDR_CTL, PRECKL_CTL, PRECKR_CTL, Input: ANAMICL, ANAMICR How the routing supposed to be working, in case of the outputs: Take the Earpiece description, since all of these have similar explanation: ---cut---...
    on May 6, 2009

  • Forum Post: Audio Gross and Fine Gain Adjustments for the TPS65950

    Brad Nielsen
    I had a question that came up today on TIs TPS65950,the trouble is, we can't get the ARXR2PGA register gain control to work properly. This register has two fields; one fine gain and one course gain settings. We hear no change in audio level for any setting between mute and 0dB in the fine gain...
    on May 8, 2009

  • Forum Post: TPS65950: Reducing audio pop noise on Headset output

    Gandhar Dighe
    Q: What is the correct sequence to reduce pop noise on headset output? A: Follow the sequence below: For powering on the headset amplifiers for use in application mode follow the sequence below: § Turn ON external mute control line by writing a ‘1’ to EXTMUTE...
    on May 22, 2009

  • Forum Post: Re: TPS65950

    Rajesh Lakhe
    Please connect the AUXL/R pins through a capacitor to ground with a typical value of 100nF.
    on Jul 3, 2009

  • Forum Post: Re: Noise in TPS65930 stereo mode usign ALSA linux driver

    Ruchi
    Hi, I am working on the Linux sound driver (with kernel 2.6.22.18) for OMAP3 based custom board and TPS65930 codec. I am facing the same issue. I have detected noise in stereo playback when audio was played using aplay with the ALSA sound driver. Mono playback worked fine without any noise. I...
    on Jul 27, 2009

  • Forum Post: TPS65950 power consumption

    Wade VonBergen
    In table 4.21 of the data manual, it indicates power consumption under various scenarios. What assumptions are made with respect to power for the audio codec, and USB transceiver in this table? Thanks, Wade
    on Aug 21, 2009

  • Forum Post: Re: TPS65950 AUXL an AUXR specs

    Gandhar Dighe
    Hi Gene, 1. Max. Vp-p is 1.5V. This is part of the amplifier input specs. see table 6-21 in the data manual. Vref on this device is 0.75V. I dont think you are referring to this Vref. Please let me know what reference you need. 2. Audio ADC's are Sigma- delta. Sampling frequency is selected in...
    on Sep 22, 2009

  • Forum Post: Re: TPS65950 AUXL an AUXR specs

    Gandhar Dighe
    Hi, Here are some answers: 2. On the design the combined resolution is measured for the microphone amplifier and the ADC and this is 15-bits. 4.The input common mode of AUXL and AUXR is set by the microphone amplifier. So, in application mode, it is needed to have a DC blocking capacitor (or AC...
    on Sep 25, 2009

  • Forum Post: TPS65950: Audio mixing use case

    Gandhar Dighe
    Customer question: Q: Can we mix I2S data and PCM data on the RX path and route it to BT? A: This is not possible. It is ok to mix I2S and PCM RX data and route to any analog output amplifier. However, this mixed data cannot be routed to BT interface.
    on Sep 25, 2009

  • Forum Post: TPS65950: I2S and PCM connections for the system

    Gandhar Dighe
    Customer question: We are using the TPS65950 in the design for the power and audio codec requirements. In this design we are planning the following. Interface the OMAP McBSP2 to TPS65950 I2S Interface the OMAP McBSP3 to TPS65950 Voice-PCM Interface the TPS65950 BT-PCM with the PCM...
    on Oct 2, 2009

  • Forum Post: [TWL5030] MONO, differential speaker out is needed

    Logan Lee
    Dear, According to TRM, pre-drv output only supports Stereo, single-ended. But is there any way to configure it as MONO, differential output? Thank you. Regards, Logan
    on Jan 29, 2010

  • Forum Post: Re: [TPS65950]Load impedance spec on HSOR/HSOL

    Gandhar Dighe
    Hi Antony, 32 ohm should also be fine. There shouldnt be any issues with this. Regards, Gandhar.
    on Jun 14, 2010

  • Forum Post: [TWL5030] Simultaneous uplink usage to both Voice PCM IF and Audio IF

    Logan Lee
    Dear Sir, Is it supported by TWL5030 to direct analog microphone uplink data to both Voice PCM I/F and Audio I/F, simultaneously? Typical use case will be, normal voice call with Modem thru Voice PCM (8KHz) I/F, and recording uplink data (44.1KHz) thru Audio I/F by OMAP. If possible, what...
    on Jul 5, 2010

  • Forum Post: TPS65930 Audio ADC Stereo Inputs

    Hugh McDowell
    Hi there, we are planning to use the TPS65930 in conjunction with the DM3730 and I need clarification on the use of the audio codec. In document SWCS037E, page 61 there is a note stating “If two audio inputs are needed, and mic bias is not needed, the AUXR input can be used with MIC_MAIN...
    on Nov 24, 2010

  • Forum Post: Re: TPS65930 Audio ADC Stereo Inputs

    Gandhar Dighe
    Hi, That note mainly says that if two audio inputs (stereo use case) are required then one can use the differential input amplifier. In this case one input needs to be grounded via a capacitor. In doing this you will lose half the signal amplitude though. Yes, 1.5Vp-p is the max analog threshold...
    on Nov 24, 2010

  • Forum Post: Re: TPS65950 main and sub microphones: noise cancellation

    Gandhar Dighe
    Hi Andrea, This has to be done on OMAP side in DSP algorithms. I dont know if anyone has implemented this. You can ask on OMAP forums and may get some leads. Regards, Gandhar.
    on Dec 1, 2010

  • Forum Post: Re: Tps65950 ADC timing

    Gandhar Dighe
    Hi, I am not sure I understand your question correctly. May be the following will help: On the input this device has two amplifiers. These can be used either with differential configuration for sub and main mic or for stereo configuration with AUXL/R. Regards, Gandhar.
    on Dec 1, 2010

  • Forum Post: Re: Tps65950 ADC timing

    Gandhar Dighe
    Hi Volkan, OK, sorry for referring to the digital microphone. On the device the analog signal is sampled at the same time. So, using the two input amplifiers you will have concurrent sampling. We do not have any plots to demonstrate this though. It is done in design and there i sno external programming...
    on Dec 8, 2010

  • Forum Post: Re: TPS65950 Cannot bypass TX Digital Audio Filter Module

    Gandhar Dighe
    Hi, I am not sure about the path you are using in your tests. Are you using loopback on the device or you are feeding data from digital end (using OMAP). The reason I ask this is to see where you need to bypass the HPF. At uplink and/or downlink. From your first post you mentioned that you are setting...
    on Jan 7, 2011

  • Forum Post: Re: TPS65950 Cannot bypass TX Digital Audio Filter Module

    Rafael Christ
    Hi, I 'm also not sure about the path inside TPS65950. I'm using OMAP35xx. Maybe this can help, it shows the hardware setup on Gumstix Overo COM ( http://www.gumstix.net/images/gumstix_overo_signals_v1.4.pdf ) I set OPT_MODE = 1 from CODEC_MODE register. I believe the data follows...
    on Jan 11, 2011

  • Forum Post: Re: TPS65950 Cannot bypass TX Digital Audio Filter Module

    Gandhar Dighe
    Hi, Can you please check your schematic and see if you have a capacitor on the AUXL and AUXR inputs. This would be the place where your input is getting filtered/attenuated. If there is a capacitor then you may want to remove it and check the waveform. The capacitor is generally populated (recommended...
    on Jan 12, 2011

  • Forum Post: Re: TPS65950 Cannot bypass TX Digital Audio Filter Module

    Rafael Christ
    Hi, That's a good idea. I've never thought about a hardware filter. I checked the schematic and I found these capacitors on Audio In. I bypassed them and now the signal goes directly to AUXL/R. I ran some tests but the signal still gets attenuated. Thanks again!
    on Jan 13, 2011
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