Data Sheet (1)
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PLL Tuned VHF (Channel 3 or 4) Audio/Video Modulator[MC44CC375AV]
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The new MC44CC375 CMOS RF modulator is the latest generation of NXP® RF modulators, and is the replacement for the legacy MC44BS375 BiCMOS device.
The MC44CC375 RF modulator is designed for use in set-top boxes (STB), digital video recorders (DVR), DVD players and similar devices, as well as Digital TV adapters. The MC44CC375 is designed for applications requiring support for US broadcast, channel 3 or channel 4, RF outputs.
A programmable, internal PLL tunes the modulator, and the desired channel 3 or 4 frequency is selected using the external package pin, Channel Selection (CHS). No external tank circuit components are required, which reduces PCB design design complexity and cost. The on-chip PLL obtains its reference from a low cost 4MHz crystal oscillator.
The sound oscillator can be turned ON and OFF via the external package pin, Sound Oscillator Control (SOC). A fixed Picture to Sound raio of 12dB and 4.5MHz sound subcarrier are used for the MC44CC375AV. A low-power standby mode is selectable via the pin, Power Save (PSAVE), which turns off all internal VCOs and mixers.
Also included in this new generation of CMOS RF modulator is a Sound Auxiliary Input, pin (AUX), which bypasses the sound FM modulator. This direct RF modulator has found numerous applications in BTSC stereo systems.
The MC44CC375 is available in a 16-pin SOIC, Pb-free package. The MC44CC375 modulator is functionally equivalent to the legacy MC44BS375 BiCMOS part, but is not a direct drop-in replacement.
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