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MC44CC373CAS Datasheet(PDF) 3 Page - Freescale Semiconductor, Inc |
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MC44CC373CAS Datasheet(HTML) 3 Page - Freescale Semiconductor, Inc |
3 / 28 page Digital Home Freescale Semiconductor 3 MC44CC373 FUNCTIONAL OVERVIEW Figure 2 shows a simplified block diagram of the MC44CC373CA and MC44CC374CA modulators. There are three main sections: 1. A high speed I2C-compatible bus section for control and programming. 2. A PLL section to synthesize the UHF output channel frequency. 3. A modulator section, which accepts audio and video inputs and modulates the RF carrier An on-chip simple video test pattern generator with an au- dio test signal is included, but is not shown in the block dia- gram. The MC44CC373/4CA operates as a multi-standard mod- ulator and can handle the following systems using the same external circuit components: B/G, I, D/K, L, M/N. The different orderable part numbers provide: a choice in the pre-programmed power-up default channel frequency, the output power level and a pre-programmed secondary I2C address. Figure 2. MC44CC373/374 Simplified Block Diagram 3 12 11 8 7 5 6 9 14 16 1 2 4 10 13 15 Clamp Sound PFD Program Divider Audio Amplifier L/BG LPF ALC Peak White Clip FM L/BG AM 31.25/62.5 kHz 31.25 kHz AM Modulator UHF OSC (2 x Fo) Prescaler ÷8 Ref Divider ÷ 128 VHF Dividers Program Divider ÷N11:N0 Phase Comp. Sound Oscillator and FM Modulator High Speed I2C Bus Receiver GND MODULATOR SECTION VCO and PLL SECTION BUS SECTION AUXIN VCC AUDIOIN PREEM VIDEOIN SPLLFLT VCC RFOUT LOP SCL SDA GND PLLFLT XTAL (4 MHz) NO CONNECT XO Prescaler ÷1, 2 or 4 ÷2 RF Sound Modulator Video Modulator XCO |
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