RF Switch for TVs, Set-Top Boxes, and DVRs

PeregrineThe PE42721 is an absorptive 75-Ω single pole, double throw (SPDT) RF switch developed on Peregrine’s UltraCMOSprocess technology. The Peregrine HaRP technology-enhanced switch is well suited for designers of digital TV (DTV) tuner modules, cable TV (CATV) signal switching and distribution systems, multi-tuner DVRs, and set-top boxes.

The switch is ideal for geographic markets (e.g., China, Japan, Korea, and Latin America) where broadband-TV devices must accommodate multiple RF inputs for cable, satellite, and terrestrial reception while avoiding interference among these signals. The PE42721 switch’s isolation is very high; therefore only one tuner chip is needed in each device.
The PE42721 switch pairs the high isolation with low insertion loss, which improves the signal fidelity by reducing the signal-to-noise ratio (SNR). This feature also helps the switch deliver best-in-class linearity and electrostatic-discharge (ESD) performance.

The PE42721 provides isolation of greater than 55 dB across the entire broad-frequency range from 5 MHz to 2.2 GHz. The 3-mm × 3-mm switch supports 1.8- and 3.3-V control logic and RoHS-compliant packaging.

The PE42721 costs $0.45 each in 10,000-unit quantities. Evaluation kit boards cost $95.

Peregrine Semiconductor Corp.


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