參數(shù)資料
型號(hào): MC44BC375UAEF
廠商: Freescale Semiconductor
文件頁(yè)數(shù): 5/20頁(yè)
文件大?。?/td> 0K
描述: IC A-VHF MODULATOR 16-SOIC
標(biāo)準(zhǔn)包裝: 48
類型: 調(diào)制器
應(yīng)用: 機(jī)頂盒
安裝類型: 表面貼裝
封裝/外殼: 16-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 16-SOIC N
包裝: 管件
Modulator Functionality
MC44BC375/U/J/T Technical Data
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
s. It is 470pF for B/G standards (50s).
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
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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