MC44BC375U中文资料VHF Audio/Video Modulator数据手册恩XP规格书

描述 Description

Overview The MC44BC375U/J/T is a Phase Locked Loop (PLL) tuned, Very High Frequency (VHF), audio/video (A/V), high integration modulator, integrated circuit (IC). It is intended for use in VCRs, Games, and Set-Top box systems. The MC44BC375U/J/T is compatible with the National Television System Committee (NTSC) format. No external tank circuit components are needed. This reduces Printed Circuit Board (PCB) design sensitivity and the need for external adjustments. A 4MHz crystal oscillator provides the PLL reference, a sound subcarrier is generated on-chip with no external components, and a Power Save function is selected by the PSave/LO pin, which turns OFF all internal VCOs and Mixers. Simultaneously, it switches ON the Logic Output Port (LOP). The MC44BC375U/J/T is available in a 16-pin (SO16NB) package.

特性 Features

•80 dBuV RF output level for MC44BC375UA
•76 dBuV RF output level for MC44BC375U/J/T
•Channel selected by CHS pin
•Integrated on-chip oscillator - no external tank circuit
•Extremely low external components count
•Adjustable video modulation depth (85% w/o adjustment)
•Peak White Clip
•Programmable picture/sound carrier ratio (14 dB and 16 dB) selected by PSS pin
•Integrated on-chip programmable sound subcarrier oscillator (4.5 and 5.5 MHz selected by SFS pin), no external varicaps
•Modulator standby mode selected by Psave/LO pin
•Transient output inhibit during PLL lock-up at power-on
•Logic output port selected by Psave/LO pin (Antenna Switch Driver)
•Extremely robust ESD protection, minimum 4 kV, typical 6 kV