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MC44BC375UEF Datasheet(PDF) 3 Page - Freescale Semiconductor, Inc |
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MC44BC375UEF Datasheet(HTML) 3 Page - Freescale Semiconductor, Inc |
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3 / 16 page  Application Specific Products Freescale Semiconductor 3 MC44BC375U FUNCTIONAL OVERVIEW Figure 2 shows a simplified block diagram of the MC44BS375U and MC33BS375UA devices. There are two main sections: 1. A PLL section to synthesize the VHF output channel frequency for channel 3 or channel 4. 2. A modulator section which accepts audio and video inputs and modulates the VHF carrier. The high frequency BiCMOS technology allows integration of the VHF tank circuit and certain filtering functions eliminat- ing the need for a number of external components. Figure 2. MC44BS375U/UA Simplified Block Diagram POWER SUPPLY The two device VCCS (pins 11 and 14) must be applied at the same time to ensure all internal blocks are correctly bi- ased. Do NOT bias any other pin before VCC is applied to the device. STANDBY MODES During standby mode, the modulator is switched to low power consumption. The sound oscillator, UHF oscillator and VHF dividers, video and sound modulator sections bias are internally turned OFF. The modulator is programmed in standby mode when pin 9, PSave/LO, is set to a “LO” level (see “Pin Selection” on page 4). LOGIC OUTPUT PORT The Logic Output Port is used to control an external switch (such as an antenna switch or an attenuator). This pin is an open collector transistor able to sink up to 15 mA at a low volt- age. The LOP output is switched between a “HI” and “LO” level with pin 9, Psave/LO (see “Pin Selection” on page 4). VCO & PLL SECTION 8 1 2 31.25 kHz 6 15 10 4 Channel Select — CHS Picture-Sound Select — PSS VIDEOIN SPLLFLT PREEM PLLFLT XTAL MODULATOR SECTION 4 MHz XCO UHF OSC. 13 Sound Modulator Video Modulator LPF ALC Sound Oscillator and FM Modulator Sound PFD Audio Amplifier Prog. Divider 7 AUDIOIN 3 LOP 11 VCC LPF 12 5 GND 31.25 kHz Clamp Prog. Divider Phase Comp. Ref Divider ÷128 75 Ω 9 16 Sound Freq Select — SFS 14 VHF Divider ÷8 Prescaler ÷8 RFOUT Power save Psave/ LOP RFOVCC LPF GND Peak White Clip |
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