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MC44BC375UD Datasheet(PDF) 13 Page - Motorola, Inc |
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MC44BC375UD Datasheet(HTML) 13 Page - Motorola, Inc |
13 / 20 page Modulator Functionality MOTOROLA MC44BC375/U/J/T Technical Data 13 The audio pre-emphasis circuit is a high-pass filter with an external capacitor C1 and an internal resistor (100 kOhms typical). The recommended capacitor value (750 pF) is for M/N standards; time constant is 75 µs. It is 470pF for B/G standards (50µs). Audio bandwidth specification is for 50Hz to 15Khz range, with pre-emphasis circuit engaged. Without this pre-emphasis circuit, it is possible to extend the audio bandwidth to the high frequencies as there is no internal frequency limitation (stereo application). 12.8 PLL Section — Dividers The reference divider is a fixed divide by 128 resulting in a reference frequency of 31.25Khz with a 4.0Mhz crystal. The 31.25Khz reference frequency is used for both UHF and Sound PLLs. The prescaler is a fixed divide by 8 and is permanently engaged. The VHF divider is different for each of the 3 versions. The programmable divider’s division ratio is controlled by CHS pin voltage in order to get the following VHF frequencies: 12.9 Selectable Pins Pins CHS, PSS, SFS are internally pulled up to 5V. Device Channel VHF divider MC44BC375U CH3 = 61.25Mhz 8 CH4 = 67.25Mhz MC44BC375J CH1 = 91.25Mhz 6 CH2 = 97.25Mhz MC44BC375T CH13 = 211.25Mhz 3 Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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