MC44BC374_ARCHIVED数据手册恩XP中文资料规格书

描述 Description

Overview The MC44BC374 is a single or dual output, phase-locked loop (PLL) tuned, ultra high frequency (UHF) and very high frequency (VHF), audio/video (A/V), high integration modulator, integrated circuit (IC). It isintended for use in VCRs, games, and set-top box systems. The MC44BC374B has dual television outputs.The MC44BC374 is compatible with the following formats:PAL—Phase Alternation Line (European TV format) NTSC—National Television System CommitteeAn on-chip high-speed I2C compatible bus receiver sets the channel. It is tuned by a PLL over the full range of the UHF bands. 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, which are selectable using the bus.The modulation standard is chosen using a control bit that selects between System L and System B/G.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.The MC44BC374 and MC44BC374B are available in two different 24-pin packages:SO24-WB (wide body) and TSSOP24. The MC44BC374C is available in a 16-pin (SO16NB) package.

特性 Features

•No external varicaps diodes/inductor or tuned components
•Channel 21-69 UHF operation
•VHF range possible by internal dividers (30 MHz to 450 MHz)
•Integrated on-chip programmable UHF oscillator
•Extremely low external components count
•High-speed read and write I2C-bus compatible (800 kHz)
•Fixed video modulation depth (80% in PAL and 90% in SECAM)
•Peak White Clip disabled using the bus
•Programmable picture/sound carrier ratio (12 dB and 16 dB)
•Integrated on-chip programmable sound subcarrier oscillator (4.5 MHz to 6.5 MHz)—no external varicaps
•On-chip video test pattern generator with sound test signal (1 kHz)
•Low-power programmable modulator standby mode (booster active)
•Transient output inhibit during PLL lock-up at power-on
•Logical output port controlled by bus
•Integrated antenna booster/splitter (40 MHz to 860 MHz)
•Custom masked versions with unique start-up settings possible (no I2C bus programming required)
•Extremely robust ESD protection, minimum 4 kV, typical 6 kV