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TDA4470-MFSG3Y PDF预览

TDA4470-MFSG3Y

更新时间： 2024-01-07 09:43:06
品牌 Logo 应用领域
爱特美尔 - ATMEL 光电二极管商用集成电路
页数 文件大小 规格书
24页 252K
描述
Audio/Video Demodulator, AM/FM, Bipolar, PDSO28, ROHS COMPLIANT, SSOP-28

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TDA4470-MFSG3Y 技术参数

是否Rohs认证： 符合生命周期：Obsolete
零件包装代码：SSOP包装说明：SSOP, SSOP28,.25
针数：28Reach Compliance Code：unknown
风险等级：5.55商用集成电路类型：AUDIO/VIDEO DEMODULATOR
解调类型：AM/FM谐波失真：1%
JESD-30 代码：R-PDSO-G28JESD-609代码：e3
长度：9.05 mm湿度敏感等级：1
功能数量：1端子数量：28
最高工作温度：85 °C最低工作温度：-10 °C
输出电压标称（AM）：500 mV标称输出电压（调频）：250 mV
封装主体材料：PLASTIC/EPOXY封装代码：SSOP
封装等效代码：SSOP28,.25封装形状：RECTANGULAR
封装形式：SMALL OUTLINE, SHRINK PITCH峰值回流温度（摄氏度）：260
电源：5 V认证状态：Not Qualified
信噪比Nom（FM）：60 dB子类别：Other Consumer ICs
最大压摆率：93 mA最大供电电压 (Vsup)：6 V
最小供电电压 (Vsup)：4.5 V表面贴装：YES
技术：BIPOLAR温度等级：COMMERCIAL EXTENDED
端子面层：Matte Tin (Sn) - annealed端子形式：GULL WING
端子节距：0.65 mm端子位置：DUAL
处于峰值回流温度下的最长时间：NOT SPECIFIED宽度：4.4 mm
Base Number Matches：1

TDA4470-MFSG3Y 数据手册

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2.4  
Video Demodulation and Amplifier  
The video IF signal, which is applied from the gain-controlled IF amplifier, is multiplied with the  
in-phase component of the VCO signal. The video demodulator is designed for low distortion  
and large bandwidth. The demodulator output signal passes an integrated low-pass filter for  
attenuation of the residual vision carrier and is fed to the video amplifier. The video amplifier is  
realized by an operational amplifier with internal feedback and 8 MHz bandwidth (–3 dB). A stan-  
dard dependent DC level shift in this stage delivers the same synchronous level for positive and  
negative modulation. An additional noise clipping is provided. The video signal is fed to the  
VIF-AGC and to the video output buffer. This amplifier with a gain of 6 dB offers easy adoption of  
the sound trap. For a nominal video IF modulation, the video output signal at pin 12 is 2 VPP.  
2.5  
Sound IF Amplifier and SIF-AGC  
The SIF amplifier is nearly identical with the 3-stage VIF amplifier, except that the first amplifier  
stage exists twice and is switchable by a control voltage at pin 3. Therefore, it is possible to  
switch between two different SAW filters with minimal external expense. Both SIF inputs fea-  
tures excellent cross-talk attenuation and an input impedance which is independent from the  
switching condition.  
The SIF-AGC is related to the average level of the AM or FM carrier and controls the SIF ampli-  
fier to provide a constant SIF signal to the AM demodulator and QPS mixer.  
2.6  
AM Demodulator  
The alignment-free AM demodulator is realized by a synchronous detector. The modulated SIF  
signal from the SIF amplifier output is multiplied in phase with the limited SIF signal (AM is  
removed). The AF signal of the demodulator output is fed to the output amplifier and to the  
SIF-AGC. For all TV standards with negative video modulation (e.g., B/G standard), the AF out-  
put signal (pin 25) is switched off by the standard switch.  
2.7  
2.8  
Quasi Parallel Sound (QPS) Mixer  
The QPS mixer is realized by a multiplier. The SIF signal (FM or NICAM carrier) is converted to  
the intercarrier frequency by the regenerated picture carrier (quadrature signal) which is pro-  
vided from the VCO. The intercarrier signal is fed via an output amplifier to pin 24.  
Standard Switch  
To have equal polarity of the video output signal the polarity can be switched in the demodula-  
tion stage in accordance with the TV standard. Additionally a standard dependent DC level shift  
in the video amplifier delivers the same sync. level. In parallel to this, the correct VIF-AGC is  
selected for positively or negatively modulated VIF signals. In the case of negative modulation  
(e.g., B/G standard) the AM output signal is switched off. For positive modulation (L standard)  
the AM demodulator and QPS mixer is active. This condition allows a parallel operation of the  
AM sound signal and the NICAM-L stereo sound.  
2.9  
L’ Switch  
With a control voltage at pin 14 the VCO frequency can be switched in order to set required L’  
value (L’ standard). Also a fine adjustment of the L’-VCO center frequency is possible via a  
potentiometer. The L' switch is only active for positively modulated video IF-signals (standard  
switch in L mode).  
4
TDA4470  
4803C–TVVCR–10/05  
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