MC44BC373C/374C Technical Data

Features

1 Features

MC44BC373C: Multi-Standard PAL/SECAM/NTSC Modulator

MC44BC374C: PAL/NTSC only Modulator

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 6.5MHz subcarrier frequencies. These frequencies are selectable using the bus.

The modulation standard can be chosen using a control bit that selects between System L or System B/G

(MC44BC373C only).

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 MC44BC373C/4C also has the following features:

•

No external varicaps diodes/inductor or tuned components

•

Channel 21-69 UHF operation

•

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

•

Integrated on-chip programmable UHF oscillator

•

Extremely low external components count

•

•

Fixed video modulation depth (80% in PAL and 90% in SECAM)

•

Peak White Clip disabled via the bus

•

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

•

Integrated on-chip programmable sound subcarrier oscillator

(4.5MHz to 6.5MHz)—No external varicaps

•

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

•

Low-power programmable modulator standby mode

•

Transient output inhibit during PLL Lock-up at power-ON

•

Logical Output Port controlled by bus

•

Custom masked versions with unique start-up settings possible

•

Extremely robust ESD protection, minimum 4kV, typical 6kV

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com