Analog and audio

We are using TDA7492 since 2013 on some different design, and up to few months ago everything was ok. But recently we have random faults on VDDS regulator. Currently the percentage of failures, all of the same type, is 5%. Too high for us. In all our projects TDA7492 is connecred almost in the same way, and the heatsink is the same. The only difference is the gain level (pin GAIN0, GAIN1 setting). The fault concerns pin 26 (3.3-V regulator output referred to ground for signal blocks): the output voltage drop to 0.1V ...1.8V instead of 3.3V, and the ampli stops to sound. Replacing the chip the problem disappears. Suppllying 3.3V to pin 26 from an external source, the broken ampli resumes playing normally. On some circuits we performed hard thermal stress tests with temperature probes on thermal pad and heatsink, without encountering any problems.So the questions are: 1) What isthe cause of the failure? 2) have GAIN0, GAIN1 internal pull down resistror? From the schemati

..

Hello, I am using STPM 32 for my metering application and UART interface to communicate with MCU. I am using optocouplers for isolation between analog STPM32 and digital uC section. In the datasheet, it has given that pins like EN, SYS and SCS should be used for proper configurations. However , I would like to have optimized circuit as I need to use less optocouplers to save the space. Please let me know whether these controlling pins can be pulled up without affecting STPM32 's operation ?Regards, Omkar

Hi, trying to decode the date code on some TL084IDT SO14. Can not find anything in the data sheets or other product documentation.The two codes are: MZ15808 and MZ9Y823. 

We are using TDA7492 since 2013 on some different design, and up to few months ago everything was ok. But recently we have random faults on VDDS regulator. Currently the percentage of failures, all of the same type, is 5%. Too high for us. In all our projects TDA7492 is connecred almost in the same way, and the heatsink is the same. The only difference is the gain level (pin GAIN0, GAIN1 setting). The fault concerns pin 26 (3.3-V regulator output referred to ground for signal blocks): the output voltage drop to 0.1V ...1.8V instead of 3.3V, and the ampli stops to sound. Replacing the chip the problem disappears. Suppllying 3.3V to pin 26 from an external source, the broken ampli resumes playing normally. On some circuits we performed hard thermal stress tests with temperature probes on thermal pad and heatsink, without encountering any problems. So the questions are: 1) What is the cause of the failure? 2) have GAIN0, GAIN1 internal pull down resistror? From the schematics in ds and

 I've been able to get the TDA7269A to work as a standalone audio amp, but it won't work on a system board (or as expected).  The data sheet offers 3 different ways to configure for single-supply power and I've been thru them all several times, trying to disprove insanity:1K R's shorted to gnd - amp goes into shutdown. This works for my standalone amp.1K R's tied to gnd thru 5.6nF cap's - only get x2 gain.1K R's tied to Pin 9(Ref) - Lower half of the output waveform is lopped off.I have no idea what to try next. Thoughts?

I have a part that I used before, but I can't find it when trying to find the parts data sheet.Component silk marking is G2150 GP735, GME GP812, EE Z 750.Please inform to me the maker part no.Thanks and BR

..

Hello, Recent testing of the RHF1401 ADC with the internal voltage reference option has shown better performance than with our external reference. However, in section 3.5.2 (p. 26) of the datasheet there is a suggestion that an external reference may provide better temperature behavior as well as linearity. However, the datasheet does not provide a specification for the internal reference temperature coefficient, only what we assume is the initial range at 25 degC (0.76 V min., 0.84 V typ., 0.95 V max.). Please provide this information so that we may finalize the design with confidence. Best Regards, Evan Livingstone

Hi, ST team TDA7851L can pass the ESD test of ±3KV contact to EUT without any pop nosie or muting?My a product using TDA7851L have POP nosie or muting when do ±3KV contacting ESD test 。But my costomer requests that there be no noise or muting . I have bought a lot of products in the market that use TDA7851L for testing. These products will be muting.So I am not sure whether there is something wrong with my design or the TDA7851L itself cannot pass.thank you.

It seems like AcousticSL software is suitable only for digital MEMS microphones. Is anyone aware of some alternatives to that for analog microphones? I'm interested in sound source localization.If not I guess I will have to try to implement GCC-Phat algorithm on my own. Any information on that subject greatly appreciated.

LDO40L -> Enable PIN. Can I connect this pin directly to Uin to the Enabble-Pin or must I use a resistor (for example 10K for limiting Current input to the PIN Enab) to connct Enab to Uin for enable the chip?

Can't find any documentation for this op amp. Someone can tell you where to get it, as well as a possible analogue? Thank!

we need this rollup with the new logo.​

..

Hi!I'm want to use the component TS472. When I use an input signal -30dBu and a gain 40db it's work fine. When I use an input signalwith 0dBu and a gain 0dB it doesn't word. I don't know why. The outputsignal is less then 1Vpp and not the wave from the input.According data sheet the inputsignal could be +-0,3V from Vss.What can I do that this issue is working fine?

..

Hi, I am trying to make the ADC1 on the SensorTile Evaluation board work in DMA mode. I have already gotten great help from @berendi​ on the interrupt mode for the ADC. I am still following this tutorial more or less: https://visualgdb.com/tutorials/arm/stm32/adc/I have declared all necessary CB function, I think, and I double checked the spelling. The program does not fall into an error or hard fault handler anywhere, it just seems like the interrupts never trigger. The DMA configuration seems slightly different from the tutorial, so so far I was trying to get all the parameters right. Does anyone have experience with the ADC1 in DMA mode on the SensorTile board?Sincerely,void ConfigureDMA() { __DMA2_CLK_ENABLE(); hdma2.Instance = DMA2_Channel3; hdma2.ChannelIndex = 3; hdma2.DmaBaseAddress = DMA2;   hdma2.Init.Request

The specs the OP-AMP should have are:Supply voltage 3- 15 V single supplypropagation delay < 50 nsable to withstand negative voltage spikes of -3.5 V (duration is less than 50 ns, occurency 150 kHz)Thank you for your help

..

..

Hello,i try for moths to get a wave file from SD to the DAC. I the ST LL_DAC_ADC_project description stands.############################################# LL_DAC_EnableDMAReq(DAC1, LL_DAC_CHANNEL_1); // enable DMA for Channel1 LL_DAC_Enable(DAC1, LL_DAC_CHANNEL_1); //enable Channel on DAC LL_DMA_ConfigAddresses(DMA1, LL_DMA_CHANNEL_7 , (uint32_t)dacbuf, LL_DAC_DMA_GetRegAddr(DAC1, LL_DAC_CHANNEL_1, LL_DAC_DMA_REG_DATA_12BITS_RIGHT_ALIGNED ), LL_DMA_DIRECTION_MEMORY_TO_PERIPH ); LL_DMA_SetDataLength(DMA1, LL_DMA_CHANNEL_7, DACBUFSIZE ); LL_DMA_EnableDoubleBufferMode(DMA1, LL_DMA_CHANNEL_7); LL_DMA_EnableChannel(DMA1, LL_DMA_CHANNEL_7); // This command is not existing#############################################I try it on my own with this startup############################################# LL_DAC_EnableDMAR

We are using the STA369 on our bespoke computer board running Android 7.1 and we need the Android drivers.All best,Colin

Hi,I'm doing a design with TSV630. VCC+ is 3.5 V and VCC- is GND and GAIN=1. What is the minimum Voltage for the SHDN pin to switch the device on? I couldn't find a formular in datasheet. In Datasheed there are only mentioned the different minimum SHDN Voltage for VCC =1.8V and VCC= 5V.

..