Hittite introduces two GaAs MESFET SPDT switches in a low cost plastic surface mount plastic packages designed for CATV and cellular applications demanding high isolation. The HMC348LP3 covers DC to 2.5 GHz and offers integrated 75 Ohm terminations, an "all off" state, > 80 dB isolation at 5 MHz and > 55 dB isolation up to 1 GHz. Configured in a 3 × 3 mm QFN SMT package, the HMC348LP3 operates using complementary positive control voltage logic lines of +5/0 V and can be configured for SPDT or SPST functions. Although the on-board terminations are 75 Ohms, performance is offered for 50 Ohm systems as well. Covering DC to 4 GHz, the HMC435MS8G is a high isolation 50 Ohm non-reflective GaAs MESFET SPDT switch in a low cost 8-lead MSOP8G surface mount package with an exposed ground paddle. The switch yields 50 to 60 dB isolation, low 0.8 dB insertion loss and +50 dBm input IP3 through the cellular/3G bands. On-chip circuitry allows positive voltage control of 0/+5 volts at very low DC currents.
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