BA7230LS中文资料Multimedia ICs NTSC color TV signal encoder数据手册ROHM规格书

描述 Description

The BA7230LS comprises an RGB signal matrix circuit, balanced modulator circuit (rectangular 2-phase modulation), oscillator circuit (VCXO) for a 3.58MHz subcarrier synchronized with video input burst signals, luminosity and color difference signal mixing circuit, and a high speed switch for selecting composite signals of video input and RGB input. RGB signals, synch signals, BFP (burst flag pulses), PCP (pedestal clamp pulses) are input, and an NTSC composite signal is output.

特性 Features

1) Allows superimposition of video images (VIDEO IN)
   and computer images (RGB IN).
2) During superimposition, the subcarrier locked onto
   the video input burst signal RGB is modulated with
   the RGB signals by the APC circuit, preventing
   unnatural color disturbance due to switching.
3) Both the RGB and video input signals are pedestal
   clamped, maintaining a natural image even during
   fluctuation in luminosity.
4) Using a half down pulse, the video signal can be
   reduced by 5dB to darken the background and
   make the superimposed RGB image easier to see.
5) Carrier leak is suppressible to less than 70mVP-P
   (VOUT = 2VP-P) without adjustment.
6) Can be adapted for analog RGB input.
7) Compact 24-pin SZIP package minimizes external
   components.Applications
   Televisions (Teletext-capable), captain systems,
   video cameras, personal computers

应用 Application

Televisions (Teletext-capable), captain systems,
   video cameras, personal computers

简介

BA7230LS属于集成电路（IC）的信号开关多路复用器解码器。由ROHM制造生产的BA7230LS信号开关，多路复用器，解码器逻辑型信号开关、多路复用器和编码器 IC 可用于对以数字格式表示数据的电信号进行路由和选择。这些器件与设计用于模拟信号的类似产品有所不同，它们保留的信息表示为两个电状态之一，而不是两个外部界限内的无穷变化量。