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Fairchild’s dual analog switch exceeds USB 2.0 bandwidth specs

South Portland, Maine — Exceeding USB 2.0 bandwidth requirements has enabled Fairchild Semiconductor to deliver a dual analog switch that touts low power, high bandwidth and a crisper switching signal.

Essentially, the wide bandwidth (>750 MHz) of Fairchild's FSUSB22 switch allows passage of 3rd harmonic frequencies that are critical for maintaining maximum signal integrity with minimal distortion, jitter and phase noise.

Designed specifically to exceed the 240 MHz minimum bandwidth requirements of the
new Universal Serial Bus (USB) 2.0 high speed standard, the FSUSB22 combines low power (less than 1 microamp) and wide bandwidth in a small DQFN packages. Typical switching applications include next-generation cell phones, digital cameras, set-top boxes, computer games, printers, and notebooks.

Configurable either as a dual double pole/double throw (DPDT) switch or four-channel 2:1 multiplexer/demultiplexer for USB 2.0 connector sharing or port isolation, the FSUSB22 offers design engineers flexible options.

The 2.5 x 3.5-mm DQFN package offers a 75 percent space savings over standard TSSOP packages. The elimination of leads in the DQFN package lowers capacitance and inductance, which results in lower noise and crosstalk between the I/O terminals. Further, the exposed die attach on the bottom of the DQFN package improves the thermal performance of the
device.


Block Diagram of Fairchild's FSUSB22

Key features of the FSUSB22 analog switch include:

  • Wide bandwidth (>750 MHz; -3 dB);
  • Less than 1 microamp (maximum) quiescent current consumption;
  • Low On Resistance (RON) of 5 Ohms (typical);
  • Greater than 4 kilovolts electrostatic discharge (ESD) performance;
  • USB high speed (480 Mbits/s) and full speed (12 Mbits/s) signaling capability.

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