HI-524

HI-524 Data Sheet July 1999 File Number 3148.2 4-Channel Wideband and Video Multiplexer The HI-524 is a 4-Channel CMOS analog multiplexer designed to process single-ended signals with bandwidths up to 10MHz. The chip includes a 1 of 4 decoder for channel selection and an enable input to inhibit all channels (chip select). Three CMOS transmission gates are used in each channel, as compared to the single gate in more conventional CMOS multiplexers. This provides a double barrier to the unwanted coupling of signals from each input to the output. In addition, Dielectric Isolation (DI) processing helps to insure the Crosstalk is less than -60dB at 10MHz. The HI-524 is designed to operate into a wideband buffer amplifier such as the Intersil HA-2541. The multiplexer chip includes two “ON” switches in series, for use as a feedback element with the amplifier. This feedback resistance matches and tracks the channel ON resistance, to minimize the amplifier VOS and its variation with temperature. The HI-524 is well suited to the rapid switching of video and other wideband signals in telemetry, instrumentation, radar and video systems. Features Crosstalk (10MHz) . . . . . . . . . . . . . . . . . . . . . . . . < -60dB Fast Access Time . . . . . . . . . . . . . . . . . . . . . . . . . 150ns Fast Settling Time . . . . . . . . . . . . . . . . . . . . . . . . . 200ns TTL Compatible Applications Wideband Switching Radar TV Video ECM Functional Diagram IN1 FB (IN) SIG GND IN2 ...