Skip to main content

USB AUDIO CARD




Description.
Designing and building a USB sound card is no longer a head ache because we have got the PCM 2702 integrated circuit from Texas Instruments. The PCM2702 is an integrated 16 bit digital to analog converter that has two digital to analog output channels. The integrated interface controller of PCM2702 is compliant to the USB 1.0 standards. The IC can handle sampling rates of 48 KHz, 44.1 KHz and 32 KHz. The IC also has a number of useful features like on-chip clock generator, digital attenuator, play back flag, suspend flag, zero flag, mute function etc. The most interesting thing is that this circuit is plug & play and doesn’t need any driver software for Windows XP and Windows Vista operating systems.

The circuit gets control data and audio data from the USB through the D+ and D- pins of the PCM2702 all the data transferring is carried out at full speed. The decoded audio signals will be available at the VOUTL and VOUTR pins of the IC. The 12MHz crystal is connected between the XT0 and XT1 pins of the IC. The VBUS (USB bus power) pin and DGND (digital ground) pins of the IC are connected to the +5V and ground pins of the USB respectively. The circuit requires +5V DC and +3.3V DC for operation and both of these voltages can be derived from the USB port using LDO (low drop out) voltage regulators (not shown in circuit).




Circuit diagram.

USB sound card




Block diagram of PCM2702.

PCM2702 block diagram


Notes.


  • +5V DC supply can be derived from the USB port using a +5V LDO regulator.

  • +3.3V DC supply can be derived from the USB port using a +3.3V LDO regulator.

  • Audio signals (output) available at VOUTL and VOUTR requires further amplification for driving low impedance head phones or loud speakers.

  • The PCM2702 is available only in SSOP28 package and requires special care while assembling.

  • Before attempting this circuit please go through the datasheet of PCM2702 and get a clear idea about the device.





Comments

Popular posts from this blog

Stop Government ISPs from following You

Protect Yourself with VPN service while Torrenting. The projected “three strikes” anti-piracy code for Australian Internet Service Providers (ISPs) may be activated before long. below the Copyright Notice theme code (PDF), residential web users that square measure found pirating content are going to be subject to a series of “escalating” warning notices from rights holders, sent via ISPs. The notices can warn users that they’re infringing copyright which they’re going to face proceeding if they get 3 strikes recorded against their informatics address — that’s if they receive associate Education, Warning, and Final notice — inside a twelve-month amount. If a user gets 3 warning letters, or “strikes”, in a very 12-month amount, ISPs can facilitate copyright house owners establish them for potential proceeding when a hearing in a very prescribed court. Up to 200,000 notices may be processed and sent annually. You may read my previous Post VPN, Proxy or Tor? How To Download Torrents Anonym

Update your BIOS: Utilities from Top Motherboard Creators

PSA: Lovers assembling their own PCs are acquainted with staying aware of most recent drivers, particularly with regards to things like designs cards. Motherboard Profiles updates are additionally basic to take advantage of your equipment, yet it happens that when everything is pursuing easily weeks or months, you will, in general, ignore further Profiles redesigns as they, for the most part, bring similarity enhancements and those are a bit much except if you are changing to more up to date equipment on the equivalent motherboard. This occurred at the workplace as of late when one of our Ryzen frameworks would not wake up from rest appropriately. After much investigating, we couldn’t limit the issue until we understood this began happening simply after we introduced another GeForce RTX illustrations card. Long story short, a Profiles move up to the most recent firmware in our Asrock motherboard was all that we required. In addition, nowadays Profiles updates can be performed effortles

How to STOP Corona Caller Tune From Phone On BSNL, Jio, Vodafone, Airtel; A Step By Step Guide.

Amid the COVID-19 crisis, the Indian government has taken all steps to spread awareness regarding the utilization of masks and therefore the importance of social-distancing to fight with the pandemic. during this row, with a help of the telecom department, the Health Ministry has made ‘Corona Caller Tune‘ mandatory for all telecom networks across the country. Now people want to ‘STOP corona caller tune‘ from their phones. You guessed it right! we are talking about the decision caller tune with an individual Coughing sound at the start of the call. However, this tune is there to brief you about the security measures during this COVID-19 situation. But after 4 to five months, many of us have started getting annoyed with an equivalent. There’s little question about the importance of such a step. But after numerous days, most of the people across India knows these basic safety measures to guard themselves against coronavirus. Therefore, now people find this caller tune irritating. Addition