Product Details

The MC44BS373CA is a multi-standard, PAL/SECAM/NTSC modulator.

The channel is set by an on-chip high-speed I2C-compatible bus receiver. A phase-locked loop ( PLL ) tunesthe 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  negativemodulation.

The picture-to-sound ratio may be adjusted using the bus. In addition, an on-chip video test pattern generatorcan be switched on with a 1- kHz audio test signal.

Product 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 (93percent typical in system L and 82percent 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

Specifications

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