- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385568 > MC44BC375U (Motorola, Inc.) PLL Tuned VHF Audio/ Video High Integration Modulator ICs PDF資料下載
參數(shù)資料
| 型號： | MC44BC375U |
| 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 |
| 文件頁數(shù)： | 12/20頁 |
| 文件大小： | 537K |
| 代理商： | MC44BC375U |
12
MC44BC375/U/J/T Technical Data
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
Modulator Functionality
12.2
Test modes
The MC44BC375U/J/T test modes are enabled by any voltage level higher than Vcc on pins CHS, PSS,
SFS and VIDEO. Care must be taken in the application to not reach levels higher than Vcc on those pins.
12.3
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.
Modulator is programmed in standby mode when pin 9 PSave/LO is set to “LO” level (See PIN
SELECTION section).
12.4
Logic Output Port
The Logic Output Port is used to control an external switch (such as an antenna switch or an attenuator).
This pin is an open collector transistor able to drive up to 15mA at low voltage.
LOP level is switched between “HI” and “LO” level with pin 9 “Psave/LO” (See PIN SELECTION
section).
12.5
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 from zero (i.e. Vcc is
switched from 0V to 5V or device is switched from “Standby mode” to “Normal operation”).
There is a time-out of 263ms until the output is enabled. This lets the UHF PLL settle to its programmed
frequency. During the 263ms time-out, the sound PLL current source is set to 10
μ
A typical to speed up the
locking time; after the 263ms time-out, the current source is switched to 1
μ
A. Use care when selecting
loop filter components, to ensure the loop transient does not exceed this delay.
For test purposes, it is possible to disable the 263ms delay (see TEST MODES section).
12.6
Video section
The modulator requires a composite video input with negative going sync pulses and a nominal level of
1Vp-p. This signal is AC coupled to the video input where the sync tip level is clamped.
Video modulation depth typical value is given for 1V
CBVS
input level. It can be adjusted to any lower
value by simply adding a resistive divider at video input, resulting in a lower signal seen by the video input
stage.
The video signal is then passed to a peak white clip circuit whose function is to soft clip the top of the
video waveform if the amplitude from the sync tip to peak white goes too high. In this way over-
modulation of the carrier by the video is avoided. The clipping function is always engaged.
12.7
Sound section
The multivibrator oscillator is fully integrated and does not require any external component. An internal
low pass filter and matched structure give very low harmonics level.
The sound modulator system consists of an FM modulator incorporating the sound subcarrier oscillator.
The audio input signal is AC coupled into the amplifier which then drives the modulator.
F
Freescale Semiconductor, Inc.
n
.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MC44BC375UD | PLL Tuned VHF Audio/ Video High Integration Modulator ICs |
| MC5610_04 | FAST RECOVERY HIGH POWER MICRO HIGH VOLTAGE RECTIFIERS |
| MC56F8345 | 56F8345 16-bit Hybrid Controller |
| MC56F8345MFG60 | 56F8345 16-bit Hybrid Controller |
| MC56F8345VFG60 | 56F8345 16-bit Hybrid Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| MC44BC375UAD | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:PLL Tuned VHF Audio/Video High Integration IC |
| MC44BC375UADEVK | 功能描述:射頻開發(fā)工具 BC375UA(16 PIN) EVAL KIT RoHS:否 制造商:Taiyo Yuden 產(chǎn)品:Wireless Modules 類型:Wireless Audio 工具用于評估:WYSAAVDX7 頻率: 工作電源電壓:3.4 V to 5.5 V |
| MC44BC375UAEF | 功能描述:IC A-VHF MODULATOR 16-SOIC RoHS:是 類別:集成電路 (IC) >> 線性 - 視頻處理 系列:- 產(chǎn)品變化通告:Product Discontinuation 07/Mar/2011 標準包裝:3,000 系列:OMNITUNE™ 類型:調(diào)諧器 應(yīng)用:移動電話，手機，視頻顯示器 安裝類型:表面貼裝 封裝/外殼:65-WFBGA 供應(yīng)商設(shè)備封裝:PG-WFSGA-65 包裝:帶卷 (TR) 其它名稱:SP000365064 |
| MC44BC375UAEFR2 | 功能描述:IC A-VHF MODULATOR 16-SOIC RoHS:是 類別:集成電路 (IC) >> 線性 - 視頻處理 系列:- 產(chǎn)品變化通告:Product Discontinuation 07/Mar/2011 標準包裝:3,000 系列:OMNITUNE™ 類型:調(diào)諧器 應(yīng)用:移動電話，手機，視頻顯示器 安裝類型:表面貼裝 封裝/外殼:65-WFBGA 供應(yīng)商設(shè)備封裝:PG-WFSGA-65 包裝:帶卷 (TR) 其它名稱:SP000365064 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。