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MC44CC375AV Datasheet(PDF) 3 Page - Freescale Semiconductor, Inc |
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MC44CC375AV Datasheet(HTML) 3 Page - Freescale Semiconductor, Inc |
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3 / 16 page  Digital Home Freescale Semiconductor 3 MC44CC375AV FUNCTIONAL OVERVIEW Figure 2 shows a simplified block diagram of the MC44CC375AV device. 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 CMOS technology allows integration of the UHF tank circuit and certain filtering functions eliminat- ing the need for a number of external components. Figure 2. MC44CC375AV Simplified Block Diagram POWER SUPPLY Do NOT bias any other pin before VCC is applied to the de- vice. 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 16, PSAVE, is set to a “LO” level TRANSIENT OUTPUT INHIBIT To minimize the risk of interference to other channels while the UHF PLL is acquiring a lock on the desired frequency, the Sound and Video modulators are turned OFF at power-ON (i.e., VCC is switched from 0 V to 3.3 V). There is a time-out of 263 ms until the output is enabled. This allows the UHF PLL to settle to its programmed frequen- cy. During the 263 ms time-out, the sound PLL current source is set to 10 µA typical to speed up the locking time. After the 263 ms time-out, the current source is switched to 1.0 µA. Use care when selecting loop filter components to ensure the loop transient does not exceed this delay. 3 12 11 8 7 5 6 9 14 16 1 2 4 10 13 15 Clamp Sound PFD Program Divider Audio Amplifier LPF ALC Peak White FM 31.25 kHz 31.25 kHz UHF OSC (2 x Fo) Prescaler ÷8 Ref Divider ÷ 128 VHF Dividers Program Divider ÷N11:N0 Phase Comp. XCO Sound Oscillator and FM Modulator GND MODULATOR SECTION VCO and PLL SECTION AUX VCC AUDIO PREEM VIDEO SPLFLT VCC RFOUT SOC PSAVE CHS GND PLLFLT XTAL (4 MHz) NO CONNECT XO Prescaler ÷2 Control Section Video Modulator RF Sound Modulator |
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