Features
Freescale Semiconductor, Inc.
1 Features
The MC44BS374CA is a Multi-Standard, PAL/NTSC Modulator. 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 6.5 MHz 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 1 KHz audio test signal. The MC44BS374CA also has 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 TVout level (82 dBuV typical) High speed read and write I2C-bus compatible (800kHz) I2C-bus 5V and 3.3V compatible Fixed video modulation depth (82% typical) Peak White Clip disabled by bus Programmable picture/sound carrier ratio (12dB and 16dB) 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 ESD protection, minimum 4 kV
Freescale Semiconductor, Inc...
MC44BS374CA Technical data For More Information On This Product, Go to: www.freescale.com
Freescale Semiconductor, Inc. to the MC44BC374C Comparing the MC44BS374CA
2 Comparing the MC44BS374CA to the MC44BC374C
Compared to the MC44BC374C devices, the MC44BS374CA has the following improvements: Higher output level (82 dBuV versus 74.5 dBuV) Higher Video signal to noise (+ 3 dB) I2C-bus 3.3V compatible Lower power consumption in normal and standby modes (-2 mA) The device can be powered down without holding the I2C lines down. TB1 bit is no more available (limited compatibility with MC44355 devices no more available) Switch between the two integrated VCO's controlled directly by the frequency divider (@ 700 MHz)

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