The MC44BS373CA audio and video modulator is for use in VCRs, set-top boxes, and similar devices.

? Supports multiple standards

? TV output level 82 dBμV typical

? 5- and 3.3-V compatible I2C bus

特性 Features

The MC44BS373CA also has the following features:

? Integrated on-chip programmable UHF oscillator

? No external varicaps diodes/inductor or tuned components

? Extremely low external component count

? Channel 21–69 UHF operation

? VHF range possible by internal dividers (30–450 MHz)

? Boosted TVOUT level (82 dBμV typical)

? High-speed read and write I2C bus compatible (800 kHz)

? I2C address selectable by pin (four choices) using external resistor (available only in QFN20 package)

? I2C bus 5- and 3.3-V compatible

? Fixed video modulation depth (93 typical in system L and 82 typical in the other standards)

? Peak white clip disabled by bus

? Programmable picture/sound carrier ratio (12 and 16 dB)

? Integrated on-chip programmable sound subcarrier oscillator (4.5, 5.5, 6.0 and 6.5 MHz)—no external varicaps

? Programmable sound reference frequency (31.25 and 62.5 kHz)

? Direct RF sound modulator input (FM and AM modulator bypassed) for NICAM or stereo sound applications (available only in QFN20 package)

? On-chip video test pattern generator with sound test signal (1 kHz)

? Low-power programmable modulator standby mode

? Transient output inhibit during PLL lock-up at power-on

? Logical output port controlled by bus

? ESD protection, minimum 4 KV