參數(shù)資料
型號(hào)： MC44BC375J
廠商： Motorola, Inc.
英文描述： PLL Tuned VHF Audio/ Video High Integration Modulator ICs
中文描述： 甚高頻鎖相環(huán)調(diào)諧音頻/視頻調(diào)制器的高集成芯片
文件頁(yè)數(shù)： 13/20頁(yè)
文件大?。?/td> 537K
代理商： MC44BC375J
Modulator Functionality
MOTOROLA
MC44BC375/U/J/T Technical Data
For More Information On This Product,
Go to: www.freescale.com
13
The audio pre-emphasis circuit is a high-pass filter with an external capacitor C1 and an internal resistor
(100kOhms typical). The recommended capacitor value (750pF) is for M/N standards; time constant is
75
μ
s. It is 470pF for B/G standards (50
μ
s).
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
F
Freescale Semiconductor, Inc.
n
.
相關(guān)PDF資料
PDF描述
MC44BC375JD PLL Tuned VHF Audio/ Video High Integration Modulator ICs
MC44BC375T PLL Tuned VHF Audio/ Video High Integration Modulator ICs
MC44BC375TD PLL Tuned VHF Audio/ Video High Integration Modulator ICs
MC44BC375U PLL Tuned VHF Audio/ Video High Integration Modulator ICs
MC44BC375UD PLL Tuned VHF Audio/ Video High Integration Modulator ICs
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC44BC375JD 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:PLL Tuned VHF Audio/Video High Integration Modulator ICs
MC44BC375T 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:PLL Tuned VHF Audio/ Video High Integration Modulator ICs
MC44BC375TD 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:PLL Tuned VHF Audio/Video High Integration Modulator ICs
MC44BC375U 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:PLL Tuned VHF Audio/Video High Integration Modulator ICs
MC44BC375UA 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:PLL Tuned VHF Audio/Video High Integration IC
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