Analog and audio

Hello,I am redesigning a circuit that uses the comparator LM2903YPT, because the previous circuit had an undefined output because of the inputs that were outside the common mode range.According to the datasheet the input common mode range for my application is between -5V53 to -2V, considering also the entire operating temperature range.I expected that the output should change between Vol and Voh, where Voh is similar to Vcc+ and Vol is -5V5+0.25V=-5V25.As I can see in the simulation the output changes between  ~0V and -304mV. The inputs are now inside of the common mode range.Could you hep me please to understand the behavior of the comparator? Or if there is any issue in my circuit? Thank you in advance!

Dear Sir/Madam,We use ADC1283IPT in our unit. This IC has operating temperature range -40C...125C and storage temperature range -65...150C. Our unit must start operating at -55C. Will ADC1283IPT operate at -55C without being damaged and which parameters may deteriorate?Thank you,Alex  

Hello ST Team,I am reproducing the STEVAL-TDR014V1 evaluation board based on the PD55008-E RF power transistor and have attached the original schematic and BOM for reference.While sourcing components, I found that several parts listed in the BOM are either obsolete, difficult to source, or have ambiguous manufacturer references. Before proceeding with the PCB assembly, I would like to verify the component selections and obtain recommended replacements where necessary.I would appreciate assistance with the following: Identification of the original manufacturer part numbers corresponding to the BOM entries. Recommended currently available replacement components for obsolete or unavailable parts. Confirmation of critical specifications that must be maintained for equivalent replacements, especially for: RF matching network capacitors RF inductors and chokes Ferrite beads RF connectors Any other components with special RF or high-frequency requirements Any upd

Hello,would someone confirm my mistakes on this TDA7850 schematic??There is a ground loop isolator BA3121 on inputs and softstart mosfet to limit inrush current.Ignition/remote ON provides a buzzing noise, as soon as engine or cabin heater/fan starts you can hear the whine amplified trough speakers….Any tip is welcome :)  

GreenSoft Technology, a leading provider of environmental compliance data management services and software for the global electronics industry (http://www.greensofttech.com), has been contracted by Spindrive to collect compliance data on parts purchased from your company. We have searched on your website, but we can't find the part number STA510FTR, STA51813TR ‘s FMD. Please provide the FMD: PN:STA510FTR, STA51813TR Description: IC AUDIO CLASS D AMP PowerSSO36    

I am able to read the IIO triggered data through hexdump utility on my device.# hexdump -e '"iio0 :" 8/2 "%04x " "\n"' /dev/iio:device1iio0 :036b 0368 0358 0369 0369 036b 0369 036biio0 :036c 0368 036b 0368 036f 0370 036e 036biio0 :0b62 0b6a 0b68 0b5f 0b6c 0b70 0b6d 0b6diio0 :0b6d 0b71 0b6a 0b6b 0b71 0b6e 0b70 0b6d^C#However when I am trying to use the ./iio_readdev application then I am getting the context creation error../iio_readdev /sys/bus/iio/devices/iio:device1Unable to create IIO context#It seems local context is not getting created even though configuration is correct.Seems some improper usage of application or some more configuration missing for its usageI am using it for local context creation as it ./iio_readdev is running on target device itself.Any help of its usage will be appreciated ?

Hey,We are implementing digital microphone interfacing using ST's IMP34DT05TR microphones connected to the STM32G473VET6 microcontroller through the PDM interface, following guidelines from the application note AN5027, specifically Example 3.The configuration includes:1. SAI GPIO and Pin Configuration2. SAI Parameter Settings3. SAI DMA SettingsWe have included screenshots of these configurations.We are utilizing the PDM filter library "libPDMFilter_CM4F_GCC.a" for converting PDM to PCM. However, the output PCM data, when converted to a .wav file or played directly, results only in Noise.Could you advise on what aspects to check or steps to troubleshoot this issue effectively? Any help or guidance would be greatly appreciated.AiROT.

Hello everyone. Regarding an amplifier with two TDA7294 in bridge configuration, looking at the diagram, on IC 1 at pin 3, there is a high pass filter formed by the 0.56uF capacitor C1 and the 22K Ohm resistor. The cutoff frequency is 12,91 Hz. I would like to get closer to 0 Hz by increasing the capacitance of C1 to 22uF (cutoff frequency is 0,32 Hz). If you see IC 2, at pin 3 there is another filter formed by C2 (0.56uF) and the 22K resistor. For symmetry with the first IC, should I also increase the capacitance of C2 to 22uF in your opinion? Or leave it at 0.56uF?I thank you very much in advance for your kind reply.Cheers,Enrico  

what is the block meaning between 22.2Ω to 36Ω?what if the detected resistance value is 30Ω, what will be written in the registor and what is the result will be reported? 

Hi, no sound at all from one of the studio monitors that each use 2 TDA7294 IC’s. Pulled out PCB from both monitors. The board that functions normal, the TDA7294s get warm after a minute or so, that’s a good sign, and yes this one works fine. The other board that is dead, the TDA7294s stay cold, no sound no noise or anything at all, but yet physically look ok, no smell, no leakage on board. We want to purchase more of these chips but wanted to make sure that what is happening is normal when the TDA7294 goes bad. Studio Monitor manufacturer was not able to assist besides schematic, and online stores do not have sufficient information on the issue. Thank you for your time and support.

I wolud like to use a Class-D Audio Power Amplifier FDA903S with STM32F103RC microcontroller, but I can not find a detailed user manual of FDA903S. On the product page is only a short 15 pages description.Where can I find the details from this amplifier, I2C addresses, registers...?

Can you get a detailed document on I2C in FDA903Q?Best regards, thank you

Hello,I have two questions regarding TDA7492E amp. 1. What is the common voltage for audio inputs? 2. What is the maximum usable voltage on audio inputs? I would like to increase amplitude by op-amps, not the amp gain. Thank you and best regards,Przemek

We use the RHF1401 in a space application. In front of the RHF1401 we have a single to differential buffer, which is susceptible for radiation transients. So it can occur, that the RHF1401 receives a transient with -1.3V to 5.55V at is inputs. The transient is present for 15us.How much current can the protection diodes manage?We have series resistors which reduce the current of the transient (10.5mA negative pulse, 74.5mA positive pulse). Best regards, Alessandro

Hi everyone!I am working on a VoIP intercommunicator. The problem is that the audio coming from the microphone comes with echo. I am currently using a Raspberry PI 3 for running the SIP Client, but I am planning to use the FP-AUD-AEC1 function pack in a STM32 to pre-process and eliminate the echo coming from the microphone and then stream it in real-time through USB communication to the Raspberry PI (like an USB sound card).My question is: Is the FP-AUD-AEC1 function pack suitable for this VoIP application?In the example given in the function pack the audio track that has the echo cancellation is stored but not streamed through the USB (according to what I understood reading the documentation). I don't know if I can process in real-time the audio from the mic and send it to the Raspberry like a USB sound card. Link to FP-AUD-AEC1: FP-AUD-AEC1 - STM32Cube function pack for acoustic echo cancellation - STMicroelectronics Thank you for the collaboration!

I am laying out a PCB and would like to use the TSV912IST, which has a MiniSO8 footprint. See page 18 of the datasheet linked on this page: https://www.st.com/en/automotive-analog-and-power/tsv912.html(DS4899 - Rev 12 - November 2019)I believe that the diagram is cut off and the pitch dimension is hidden. I'm pretty sure that it is 'e' = 0.65mm, but I have yet to find absolute verification on this. I should figure this out for sure before I fab my board.So, I'd like to report a potential datasheet error. And can someone with ST please verify that I am correct: that the pitch is 0.65mm?Thank you! 

Hello,I would like to use the TSU114 in the QFN-16 package and have 2 questions:1. Can the TSU11x be used with a dual supply?  For example, can I put +1.8V on VCC+ and -1.8V on VCC-?2. How should I connect the EP of the QFN-16 package?  The datasheet mentions that the EP of the DFN-8 package should be connected to VCC- or left floating, but doesn't say how the EP of the QFN package should be connected.Thank you for any guidance you can provide.Michael

Hi there,Can anyone direct me to a Spice model for the STW12N170k5 power MOSFET?I’m relatively new to using LTSpice so any guidance on how to apply a more precise model to the default M1 model would be appreciated.I attach the circuit so far (D1 is in the wrong place and haven’t updated that yet).Thank you

Hello,i'm using STM32G070, The firmware i have programmed converts the analog voltage to didital using ADC. the code is below:the values i get from this is :OUTPUT:In the datasheet it is mention that a resister bridge for VBAT is 39K ohm which has ratio 3 on VBAT measurement .so according to this the ADC value should be around 1365 which wil give us a voltage vaue of 1.1 but the result is voltage:0.48 and adc value:600.please give me any suggestion, whats wrong with it.thanks in advance.

Hi! I need a SPICE model for TS912BIDT. I couldn't find it anywhere. Please help! Thank You!

Hi, everyoneWhat does the letter G printed on the STmicroelectronics TDA7297 IC mean?See attached image fileThanks

The following are some questions related to the absolute maximum ratings of the TSV912IQ2T which are not clear from the datasheet. Can the voltage on the input pins (2,3,5 and 6) swing to values greater than VCC + 0.2V (for example 50V) if the current is limited assuming there is a clamping diode to the supply pin? In the datasheet, there is the statement " VCC - VIN must not exceed 6 V ". In the example mentioned, 3.3V (supply voltage) - 50V (on input) = -46.7V. It is assumed that this is ok since it does not exceed 6V. Is that correct?In case the answer to question 1 is Yes, what would be the current limit value ?

Please provide STL130N8F7's MTTF file. The customer want to get this report. Thanks!

Hi, i have a AEK-AUD-D903V1 evaluation board, speaker. I want to play speaker only using I2C. is it possible How should i progress? Also, my MCU is not ST product