VHF/UHF integrated one-chip modulator ICs

28 February 2001 Telecoms, Datacoms, Wireless, IoT

A more elegant solution is now available for designers seeking low voltage and VHF/UHF booster/splitter functions thanks to two new modulator ICs introduced by Motorola. The MC44BC373 and MC44BC374 - that integrate the antenna booster/splitter functions with the traditional VHF/UHF multichannel modulator function, combine all sound subcarrier and VHF/UHF VCOS (voltage controlled oscillators) on a single chip. According to Motorola, this DigitalDNA solution will assist its customers in shortening design-time on television-related applications.

These chips allow for lower power consumption and are designed for applications that range from video cassette recorders (VCR), analog and digital set-top-boxes (STB) for satellite, terrestrial or cable television, to DVD players and video games.

"With these devices, there is no longer a need for external varactor diodes or coils. In addition, they solve the sensitivity problems related to bonding wire and PCB stray capacitances and inductances," states Don Bosco Grant of Motorola's Entertainment Division. "Potential customers no longer require the high frequency skills that were once necessary for this type of system implementation. Now, all this funtionality is encapsulated in a single chip."

The very small number of external components required makes it possible to implement a complete modulator module on the main VCR or STB chassis or to dramatically reduce tuner module size. Design of the module is greatly simplified, as well as the manufacturing flow since the remaining external components do not require any alignment, adjustment or matching.

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