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Analog switches feature automatic Vbus detection

Posted: 03 Nov 2006     Print Version  Bookmark and Share

Keywords:Fairchild  FSA201  FSA221  DPDT  switches 

The FSA201 (USB 1.1; 12Mbps) and similar FSA221 (USB 2.0; 480Mbps) multimedia-oriented, analog DPDT switches from Fairchild Semiconductor are designed to pass both single-polarity USB signals as well as bipolar analog audio signals. The tiny switches are targeted at compact handheld and battery-powered applications, "where a single I/O connector's pins must fulfill multiple roles," noted Richard Lewis, analog signal path marketing manager at Fairchild.

The switches incorporate automatic Vbus detection to find the USB signal when an USB application is plugged in. Bandwidth (-3dB) is at least 720MHz for the FSA221 and 250MHz for the FSA201.The 8-lead devices can swing negative to -2V, and so are well-suited to supporting the greatly reduced clicks and pops of bipolar Class D amplifiers (compared to single-supply, non-zero-volt biased designs); this operation also eliminates the need for a DC-blocking capacitor. They have low on-resistance Ron of 3 ohms for reduced current consumption, longer battery life, and enhanced audio performance.

The FSA221 is available in an ultrathin molded leadless package (UMLP) that is 1.4-by-1.8-by-0.55mm high; both devices are also available in a slightly larger 1.6-by-2.1mm MicroPak. Despite the small size, the switches provide 10kV of ESD protection, especially important where the IC may be located extremely close to the connector and outside world. The FSA201 is $1.10 while the FSA221 is $1.25, in 1,000-piece lots.

- Bill Schweber
Planet Analog

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