PLL Tuned VHF (Channel 3 / 4) Audio / Video Modulator

The MC44BC375U and MC44BC375UA are audio/video RF modulators for use in VCRs, set-top boxes, and similar devices. They are designed for applications requiring National Television System Committee, NTSC, channel 3 or channel 4, RF outputs. The difference between the two modulators is the RF output power level. The nominal RFOUT level for the MC44BC375U is 76 dBµV (typical) and the RFOUT level for the MC44BC375UA is 80 dBµV (typical).

Features
• Two RF output power levels offered:
    • MC44BC375U has typical RFOUT power of 76 dBµV
    • MC44BC375UA has typical RFOUT power of 80 dBµV
• U.S. broadcast frequency for Channel 3 or 4 operation is selected by CHS pin
• Programmable VHF oscillator and sound subcarrier oscillator. No external varicaps, diodes/inductors, or tuned components required.
• Programmable Picture/Sound Carrier Ratio (14 dB or 16 dB) is selected by PSS pin
• Programmable Sound Subcarrier Oscillator (4.5 or 5.5 MHz) is selected by SFS pin)
• Peak White Clip
• Low-power standby mode is selected by the Psave/LO pin
• Logic Output Port is selected by Psave/LO pin (Antenna Switch Driver)
• Transient output inhibit during PLL Lock-up at power-ON
• Available in Pb-free, RoHS compliant, narrow body SOIC 16 package
• Also available, for a limited time, in the standard Pb package with the D suffix