Analog and audio

Posted on March 20, 2014 at 19:27Thanks for help, tried several things, cannot find the right way...

Posted on February 27, 2014 at 11:32For our industrial application, we implemented a STA013 to play sound files located on a SD card. We have to play background music and sometimes play some notification sound. So we send background music MP3 to STA013 and when we have to play a notification sound, we stop the music flow, to send to STA013 the notification MP3, and restart flow of the background music. This method works correctly, but we have some trouble on the change of MP3 flow : a glitch is often heard when the MP3 flow change. We assume its comes from the brutal change of flow. We search a solution, like void mp3 buffer of sta013, or a soft reset. To avoid to many calibration of sta013, every mp3 have been reencoded to have the same characteristics.Have you already met the problem ? Have you some idea to destroy this glitch ?

Posted on October 03, 2013 at 20:24Hello! i have a trouble with setting volume level in TDA7468. I use a wiring diagram as datasheet, and send setting to this IC using the C code:void writer(unsigned char adr_IC, unsigned char adr_reg,unsigned char data){i2c_start();i2c_write(adr_IC);i2c_write(adr_reg);i2c_write(data);i2c_stop();delay_ms(50);}writer (0x88,0x00,0x00); // input=in1writer (0x88,0x01,0x00);// input gaine=0 dBwriter (0x88,0x02,0x00); // surround=offwriter (0x88,0x03,0x00);// left volume=0dB maximumwriter (0x88,0x04,0x00);// right volume=0dB maximumwriter (0x88,0x05,0x77); //bass & treble = 0dBwriter (0x88,0x06,0x01); // MUTE=offwriter (0x88,0x07,0x00); // bass ALC=OFFbut the level of the output signal is significantly lower than the input signal. chip reacts to further change the tone level and volume level to down. please, explain how to set the volume level #tda7468

Posted on January 20, 2014 at 09:00Hello, in AP-Workbench and Datasheet, i did not found any Switch to generate ''Mono'' from 2-channel Input, with STA350BW Would this be possible using the PEQ? Thank you best regards, Florian Breu #mono-downmix-sta350bw #apworkbench-forum

Posted on January 28, 2013 at 19:36Hello everyone,I can connect the input ground (from audio source) to power supply ground near the filter capacitors?As about pgnd and signal ground I have to connect both to the power supply ground with diferent cables, or in the PCB for TDA7297 I can connect both pgnd and sgnd to a large conductive bar in the pcb with two filter capacitors (PCB is not the same as power supply)?I have to connect the gnd to supply cause I will use another PCB with a design TDA2822M based for headphones.In breadboards I had terrible instability problems when connected input gnd to power supply filter capacitors, and also when connecting pgnd and sgnd thru different cables, the only way is connect input gnd near the amplifier, otherwise strange noise will appear.I hope that with good PCB layout all this problems disappear.I will later make some PCB layouts and will post it here.Thank you very much for your support,Best regards,Daniel Almeida

Posted on August 21, 2013 at 10:19I was going through the data sheet of the above mentiones Amp, can any one explain me the need for  frequency shift in TDA7498MV

Posted on July 19, 2013 at 11:43I need to know internal R1 and R2 value of  TDA2822M to adjust gain

Posted on July 25, 2013 at 08:48hi form members,   I am using audio amp. (TDA7575B) which has differential input (IN1+,IN1-) but in our case I have single ended input only from my codec, so i planned to connect IN1- pin to ground with a series capacitor. Is that OK else you have any specific recommendation please answer at the earliest. REGARDS, BALA 

Posted on August 06, 2013 at 12:50Hii want to use the STA350BW amplifier but i am not quite sure which power supply i must use.The first page of the Datasheet says:Four power output configurations(a)– 2 channels of ternary PWM (stereo mode)(2 x 50 W into 6 Ω at 25 V)– 3 channels - left, right using binary and LFEusing ternary PWM (2.1 mode) (2 x 18 W +1 x 40W into 2 x 4 Ω, 1 x 8 Ω at 25 V)– 2 channels of ternary PWM (2 x 50 W) +stereo lineout ternary– 1 channel of ternary PWM as mono-The specifications page says:Continuous output power, BTL, ternary modeTHD = 1% 27 WTHD = 10% 36 WContinuous output power SE, binary mode, RL = 4 ΩTHD = 1% 12 WTHD = 10% 15.5 WWhat kind of power supply will be sufficient?Do i need something around 50 W with peak power over 100 Wor must i go up to 100 W continuous power with more peak?Is the info from the first page related to music power or something similar?thx

Posted on February 12, 2014 at 16:20AK4683 is used to feed I2S audio to STA309A I2S input. I2S out of STA309A is again feed back to AK4683's DAC. Both I2S ports of AK4683 are set up to slave mode. Master clock is provided by AK4683 to STA309A-XTI pin. As both I2S ports of AK4683 (in and out) are configured in master mode, there is no I2S-master to drive the I2S input port clocks of STA309A (BICKI, LRCKI). So my idea is to connect STA309A BICKO->BICKI and LRCKO->LRCKI. My question is whether this setup can work. For better understanding I can send a block diagramm or schematics to you. Thanks for your help.

Posted on May 11, 2012 at 12:06Hello,How works the internal hysteresis for comparators ?Thanks for the support,Jean

Posted on January 09, 2014 at 10:35What is the APWorkbench simulation mode and when should I use it?

Posted on January 07, 2014 at 15:53Where can I get updated FTDI drivers and which OS are currently supported?

Posted on November 11, 2013 at 13:49Which OS is currently supported by the APWorkbench suite?

Posted on November 04, 2013 at 09:54I found an IC,marking 2L28I,manufactured by ST? I want to know it,s order number. #marking-brand

Posted on September 30, 2013 at 15:53Are there any example apc files for the MEMS microphone demonstrator? as indicated in the application note: AP4146, For example basic directional microphone set-up. There seems to be no Help available or very little supportive documentation for these boards.

Posted on September 12, 2013 at 18:05JPL has been considering usage of this high speed radiation hardened comparator for a space application.  The product was announced with a target specification.  However, a final specification nor DLA drawing has been forthcoming or identified on the ST site.What is the current status.RegardsMark CooperJPL

Posted on July 26, 2013 at 14:45Hi guys,I'm currently working with TSX562IQ2T in DFN8 package.Do you have some kind of recommended footprint for this package? #package-footprint #qfn #dfn

Posted on July 10, 2013 at 23:19HiI read the datasheet of the TSC1021, but it is not clear if the IC is protected from negative voltage in the Vp/Vn terminals, or cant it measure the current.I need to measure current of negative voltage, and planning on connecting Vn to the input, and Vp to the DUT.Will it work?  Thanks, Avishai

Posted on June 27, 2013 at 11:53Hello,the datasheet for the OpAmp TSV632 allows a maximum input current of 10mA (page 4).There's no sign given, so I suppose negative input currents aren't allowed.. But I'm not sure and it would help me, if they would be allowed..So, could someone clarify this, please?I have series resistors in front of the inputs which would limit the input current to -0.6mA in the worst case.. But I also noticed the input voltage dropping under the allowed Vcc- -0,2V, so it looks for me as current limiting is not enough and I also have to limit the voltage..Thanks in advance,Christian #amplifier-input-protection

Posted on June 18, 2013 at 11:23Hello, I'm product engineer and I'm regularly looking for op-amps on the your website. Having a slow connection, I'm looking for a way to select op-amp being offline. Do you have somthing to help me ? Thanks, Allan #analog-audio-datasheets-download #op-amps

Posted on June 06, 2013 at 03:39Is the STA326 thermal pad connected to GND/SUBGND or floating? Something happened when I installed a heatsink on the STA326 that caused 30V VCC to appear on the 3.3V VDD side, destroying all other components on my board. It seemed to happen right when I connected the STA326 heatsink to my PCB ground plane with screws.

Posted on May 16, 2013 at 17:01buen día, por favor necesito ayuda para obtener, the datasheet  for stv7302a  

Posted on December 23, 2012 at 23:13Good night,I've mounted a TDA7375V power amplifier on a breadboard with a 3ºC/W heatsink, and with a 16.5V/4A power suplly, the amplifier is in bridge configuration and driving 6 ohm speakers, the circuit is similar to the circuit available in the datasheet but has 1uF input capacitors, 100uF SVR and 2000uF/100nF as rail capacitors. The amplifier as a preamplifier and the signal ground is connected to this ground path, the power supply is the same. The regulators are one for TDA7375V and the other one for the preamplifier. When the amplifier is at high volumes, and the output is clipping the amplifier switches on and off very quickly making very strange noises, can this be current limiting, with 6 ohm speakers? Without the preamplifier and with the suggested circuit the same happens even with other power supplies.Thank you very much for your atention,Best regards,Daniel Almeida

Posted on December 24, 2012 at 18:14Good afternoon,I've mounted 2 amplifiers using the same power supply using 3 breadboards, one is for a TDA7297 power amplifier which is running perfectly with some changes to the specified circuit, like 470nF input capacitors instead of 220nF, and 100nF capacitors between pins 3 and ground and pin 13 and ground, 100uF standby/mute capacitor, two 470uF rail capacitors instead of only one, a 10kohm potenciometer at the inputs.The second breadboard is used for a 15V/4A regulator LM338T based, the power ground pin and the signal ground pins are both connected to the 2*470uF supply filtering, and the signal from the audio source is connected to the same path as signal ground and so the potenciometers.In the third breadboard I've a TDA2822M headphone amplifier, when this amplifier is running alone with TDA7297 with the potentiometer at the cut position the sound is very good, but if I turn the volume up at the TDA7297's potentiometer the sound coming from