Reference design for a headphone change utility which may routinely detect if a headphone has a mic or not.
Have you ever ever puzzled how telephones or computer systems can detect if a wired headset has a microphone or not? To find out how gadgets can detect headphones and how one can embrace this characteristic in your system Texas Devices (TI) has launched a reference design which may detect headphones with mic and with out mics.
The TIDA-00006 is a headset detection change to detect 3-pole or 4-pole 3.5mm equipment. A 3-pole headphone jack, also referred to as a TRS (Tip Ring Sleeve) jack, has three separate conductive parts or metallic bands on the plug. The tip carries the left audio sign, the center ring carries the fitting audio sign, and the sleeve is the bottom connection. A 4-pole headphone jack, also referred to as a TRRS (Tip Ring Ring Sleeve) jack, has a further metallic band on the plug. Along with carrying the left and proper audio indicators and floor, the fourth pole carries a microphone or a management sign. That is generally utilized in smartphones and different gadgets that help each headphones and a microphone. The distinction between these two sorts of jacks is principally within the variety of conductive parts or metallic bands on the plug. It’s vital to notice that not all gadgets help each sorts of jacks, so it’s vital to test the specs of your system earlier than buying headphones or different equipment.
This reference design is for autonomous audio headset change purposes. Some audio headsets have built-in analog microphones. The GND and MIC connections on the audio jack connector could also be swapped relying on the producer. This reference design can detect the presence of an analog microphone on the audio headset, detect the pin configuration of the MIC and Floor pins, and change the system MIC pin to the right audio jack connector. This permits the audio answer to work seamlessly with headsets from all producers.
The reference design relies on TS3A226AE which is an audio headset change that detects 3- or 4-pole 3.5mm equipment. For a 4-pole accent with a microphone, the TS3A226AE additionally detects the MIC location and routes the microphone and floor indicators routinely. The bottom sign is routed by a pair of low-impedance floor FETs (60mΩ typical), leading to minimal impression on audio cross-talk efficiency.
Options
o VDD vary = 2.6V to 4.7V with Floor FET switches (60mΩ typ RON)
o Detection initiated by exterior set off pin
o Helps FM sign transmission by the bottom FETs
o Discount of click on/pop noise
o THD (Mic): 0.002% Typical
o 8-kV Contact Discharge (IEC 61000-4-2) ESD score for Sleeve, Ring2 and Tip
This reference design has been examined by TI. The corporate has additionally supplied further assets. You could find further knowledge concerning the reference design on the corporate’s web site. To learn extra about this particular reference design click on right here.
