General description

The SA58643 is a wideband RF switch fabricated in BiCMOS technology and incorporating on-chip CMOS/TTL compatible drivers. Its primary function is to switch signals in the frequency range DC to 1 GHz from one 50 Ω channel to another. The switch is activated by a CMOS/TTL compatible signal applied to the enable channel 1 pin (ENCH1).

The extremely low current consumption makes the SA58643 ideal for portable applications. The excellent isolation and low loss makes this a suitable replacement for PIN diodes.

The SA58643 is available in an 8-pin TSSOP package.

Features

■ Wideband (DC to 1 GHz)

■ Low through loss (1 dB typical at 200 MHz)

■ Unused input is terminated internally in 50 Ω

■ Excellent overload capability (1 dB gain compression point +18 dBm at 300 MHz)

■ Low DC power (170 µA from 5 V supply)

■ Fast switching (20 ns typical)

■ Good isolation (off channel isolation 60 dB at 100 MHz)

■ Low distortion (IP3 intercept +33 dBm)

■ Good 50 Ω match (return loss 18 dB at 400 MHz)

■ Full ESD protection

■ Bidirectional operation

Applications

■ Digital transceiver front-end switch

■ Antenna switch

■ Filter selection

■ Video switch

■ FSK transmitter