MC44BS374CA

PLL Tuned UHF and VHF Audio/Video High Integration Modulator; \n\t•Integrated on-chip programmable UHF oscillator\n\t•No external varicaps diodes/inductor or tuned components\n\t•Extremely low external components count\n\t•Channel 21-69 UHF operation\n\t•VHF range possible by internal dividers (30 MHz to 450 MHz)\n\t•Boosted TVout level (82 dBuV typical)\n\t•High-speed read and write I2C-bus compatible (800 kHz)\n\t•I2C address selectable by pin (4 choices); available only in QFN20 pin package\n\t•I2C-bus 5 V and 3.3 V compatible\n\t•Fixed video modulation depth (93% typ. in system L and 82% typ. in the other standards)\n\t•Peak White Clip disabled by bus\n\t•Programmable picture/sound carrier ratio (12 dB and 16 dB)\n\t•Integrated on-chip programmable sound subcarrier oscillator (4.5, 5.5, 6.0 and 6.5 MHz) - no\n\texternal varicaps\n\t•Programmable sound reference frequency (31.25 kHz and 62.5 kHz)\n\t•Direct RF sound modulator input (FM and AM modulator bypassed for NICAM or stereo sound\n\tapplications); available only in QFN20 pin package\n\t•On-chip video test pattern generator with sound test signal (1 kHz)\n\t•Low-power programmable modulator standby mode\n\t•Transient output inhibit during PLL lock-up at power-on\n\t•Logical output port controlled by bus\n\t•ESD protection, minimum 4 kV\n;

Overview The MC44BS374CA is a multi-standard, PAL/NTSC modulator. The channel is set by an on-chip high-speed I2C compatible bus receiver. A phase-locked loop (PLL) tunes the modulator over the full UHF range. The modulator incorporates a sound subcarrier oscillator and uses a second PLL to derive 4.5, 5.5, 6.0, and 6.5 MHz subcarrier frequencies. These frequencies are selectable by bus. The modulation standard can be chosen using a control bit that selects between positive and negative modulation. The picture-to-sound ratio may be adjusted using the bus. In addition, an on-chip video test pattern generator can be switched ON with a 1 KHz audio test signal.

恩XP

MC44BS374CA

SO16NB Package

MC44BS374CAD

CMOS Audio/Video RF Modulators

TheMC44CC373/MC44CC374CMOSfamilyofRFmodulatorsisthelatestgenerationofthelegacyMC44BS373/4familyofdevices. TheMC44CC373/MC44CC374RFmodulatorsaredesignedforuseinVCRs,set-topboxes,andsimilardevices.Theysupportmultiplestandards,andcanbeprogrammedtosupportPAL

MC44BS374CAEF

CMOS Audio/Video RF Modulators

TheMC44CC373/MC44CC374CMOSfamilyofRFmodulatorsisthelatestgenerationofthelegacyMC44BS373/4familyofdevices. TheMC44CC373/MC44CC374RFmodulatorsaredesignedforuseinVCRs,set-topboxes,andsimilardevices.Theysupportmultiplestandards,andcanbeprogrammedtosupportPAL