MC44BS374T1/374T1A Advance Information

Features

1 Features

The MC44BS374T1/374T1A is a PAL/NTSC Modulator with integrated VCO.

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 by bus.

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 1KHz audio test signal.

The MC44BS374T1/374T1A have the following features:

•

Integrated on-chip programmable UHF oscillator

•

No external varicaps diodes/inductor or tuned components

•

Extremely low external components count

•

Channel 21-69 UHF operation

•

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

•

Boosted TV output level (82 dBuV typical) for the MC44BS374T1A

•

TV output level of 75 dBuV typical for the MC44BS374T1

•

•

•

Fixed video modulation depth (82% typical)

•

Peak White Clip disabled by bus

•

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

•

Integrated on-chip programmable sound subcarrier oscillator (4.5, 5.5, 6.0 and 6.5 MHz) - 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

•

Start-up on channel ‘71’ (871.25 MHz)

•

ESD protection, minimum 4 kV

2 Comparing the MC44BS374T1 and MC44BS374T1A to the

MC44BC374T1

Compared to the MC44BC374T1 devices, the MC44BS374T1/374T1A has the following improvements:

•

Higher output level for the MC44BS374T1A (82 dBuV versus 74.5 dBuV)

•

Higher Video signal to noise (+ 3 dB) for the MC44BS374T1A

•

•

Lower power consumption in normal and standby modes (-2 mA)

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com