San Jose, Calif.Pericom Semiconductor Corp. recently developed 3.3-V devices that it claims are the first to support both USB 2.0 High Speed and high-fidelity audio signals in a single chip.
The PI3USB411 and PI3USB412 USB 2.0 devices can switch high-speed differential signals at a rate of more than 1.2-Gbits/s, as well as low THD audio signals. The devices also feature USB 1.1 and USB 2.0 Full Speed support, high bandwidth (more than 600-MHz for USB channels), sub-1-ohm Ron (0.5-ohm typically) for audio channels, as well as off-isolation and crosstalk for all channels.
Housed in a 3.5-mm X 1.5-mm TDFN package, the PI3USB411 and PI3USB412 are aimed at handheld applications such as mobile phones and MP3 players. These handheld applications typically require both a USB data transfer port and a port for an external headset. Since the PI3USB411 and PI3USB412 offer multiple channels, designers can combine the two ports into one.
Two channels are targeted for high speed USB 2.0 signals (Dx), and two channels are aimed at low THD audio signals (Ax). All paths in the PI3USB411 will allow bi-directional traffic. And within the PI3USB412 device, two low THD audio signals are developed in a mux configuration. As a result, the user can have two internal sources going to a single audio output.
"The use of USB ports in audio applications is widely adapted in today's popular handheld designs," said Shaf Rahman, director of switch and interface marketing, in a statement. "Pericom has developed a unique, combined audio/USB 2.0 High Speed, single-chip solution that helps keep the size down on these mobile products, while minimizing the need for extra ports."
The PI3USB411 and PI3USB412 are lead free and in full production, with pricing of 50 cents each in 10,000-unit quantities.
For datasheets, click here: www.pericom.com/pdf/datasheets/PI3USB411.pdf
Pericom Semiconductor Corp., 1-408-435-0800, www.pericom.com