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MC44BC374T1 Datasheet(PDF) 2 Page - Freescale Semiconductor, Inc

Part No. MC44BC374T1
Description  PLL Tuned PAL/NTSC UHF and VHF Audio/Video High Integration Modulator IC
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Maker  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com

MC44BC374T1 Datasheet(HTML) 2 Page - Freescale Semiconductor, Inc

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MC44BC374T1 Technical Data
1 Features
The channel is set by an on-chip high-speed I2C compatible bus receiver. A Phase-Locked Loop ( PLL )
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 is set to System B/G.
The picture-to-sound ratio is adjusted using the bus. In addition, an on-chip video test pattern generator can
be turned ON with a 1 KHz audio test signal.
Compared with the MC44BC374C, this modulator has one IIC programming difference, a hardware
standby mode in addition to the software standby mode, and no logic output port.
Compared with the MC44BC374T, this modulator has a different start-up channel.
The MC44BC374T1 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
•High speed I2C-bus compatible (800kHz)
Fixed video modulation depth (80%)
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 modulator standby mode programmable by I2C bus or
switchable by STBY pin voltage
Transient output inhibit during PLL Lock-up at power-ON
Start-up on channel ‘71’ (871.25 MHz)
Extremely robust ESD protection, minimum 4kV, typical 6kV
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com

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