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MC44BS373CA Datasheet(PDF) 5 Page - Motorola, Inc |
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MC44BS373CA Datasheet(HTML) 5 Page - Motorola, Inc |
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5 / 52 page  MOTOROLA MC44BS373CA Data Sheet 5 MC44BS373CA Functional Overview 4 MC44BS373CA Functional Overview Figure 2 shows a simplified block diagram of the MC44BS373CA. Figure 2. MC44BS373CA Simplified Block Diagram The MC44BS373CA device has three main sections: • A high-speed I2C-compatible bus section • A PLL section to synthesize the UHF /VHF output channel frequency (from an integrated UHF oscillator, divided for VHF output) • A modulator section, which accepts audio and video inputs, then uses them to modulate the UHF/VHF carrier An on-chip video test pattern generator with an audio test signal is included. The MC44BS373CA operates as a multi-standard modulator and can handle the following systems using the same external circuit components: B /G, I, D /K, L, M/N. High-frequency BiCMOS technology allows integration of the UHF tank circuit and certain filtering functions. TVOVCC TVOUT LOP VIDEO SPLLFLT AUDIO VCCA GND PREEM XTAL PLLFLT GNDD VCCD SCL SDA BUS SECTION VCO and PLL SECTION MODULATOR SECTION Clamp Peak White L/BG 31.25/62.5 31.25 kHz 4-MHz XCO Ref Divider /128 Phase Comp PLL Prog Divider Prescaler /8 VHF Dividers Video Modulator LPF LPF RF Sound Modulator L/BG FM AM ALC LPF Prog Divider AM Modulator Audio Amplifier Sound Oscillator and FM Modulator Sound PFD kHz High Speed I2C Bus Receiver UHF OSC I2C BUS I2C BUS 75 Ω GND Clip AUXIN CAS (only in QFN 20) (only in QFN 20) |
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