MC44BC374B: Dual Output Multi-Standard Audio/Video Modulator Antenna Booster/Splitter ARCHIVED

Overview

The MC44BC374B is a Phase-Locked Loop (PLL) tuned Ultra High Frequency (UHF) and Very High Fre-quency (VHF) audio/ video (A/V) modulator integrated circuit (IC). It contains an antenna booster/ splitter for VCR, Games, and Set-Top box systems. The MC44BC374B has dual television outputs.

The MC44BC374B is compatible with the following formats:

PAL—Phase Alternation Line (European TV format)
NTSC—National Television System Committee

An on-chip high-speed I²C compatible bus receiver is used to set 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 6.5MHz subcarrier frequencies, which are selectable using the bus.

The modulation standard can be 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 gener-ator can be switched ON with a 1KHz audio test signal.

The dual output modulated signal is added to both antenna booster/ splitter outputs.

The MC44BC374B is available in two different size 24-pin packages:

SO24-WB (wide body)
TSSOP24

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Features

No external varicaps diodes/ inductor or tuned components
Channel 21-69 UHF operation
VHF range possible by internal dividers (30 MHz–450 MHz)
Integrated on-chip programmable UHF oscillator
Very 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
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 vari-caps
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)
Robust ESD protection, minimum 4 kV, typical 6 kV

MoreLess

Features

No external varicaps diodes/ inductor or tuned components
Channel 21-69 UHF operation
VHF range possible by internal dividers (30 MHz–450 MHz)
Integrated on-chip programmable UHF oscillator
Very 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
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 vari-caps
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)
Robust ESD protection, minimum 4 kV, typical 6 kV

Data Sheets

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