- 您现在的位置：买卖IC网 > PDF目录98193 > TDA6930X (INFINEON TECHNOLOGIES AG) AM, AUDIO/VIDEO DEMODULATOR, PDSO28 PDF资料下载
参数资料
| 型号： | TDA6930X |
| 厂商： | INFINEON TECHNOLOGIES AG |
| 元件分类： | 接收器 |
| 英文描述： | AM, AUDIO/VIDEO DEMODULATOR, PDSO28 |
| 封装： | PLASTIC, DSO-28 |
| 文件页数： | 6/36页 |
| 文件大小： | 822K |
| 代理商： | TDA6930X |
第1页第2页第3页第4页第5页当前第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页
Functional Description
3 - 6
TDA 6930
Wireless Components
Specification, August 1999
3.4 Functional Description (P-DSO-32)
s
Inputs
The input signal is distributed via the IF-MUX to the according amplifier
channels.
VIF-Mux
Normaly VIF1 is used for video if input ( filter with no sound carrier).
A special mode with a secondary VIF input at SIF 2 is available. In this case
the carrier recovery gets its input signal in any way from SIF1. For more
Information see input selection logic-table in the application circuit section.
In the also available Intercarrier mode for low cost application, all signals are
transferred together via VIF1 or VIF2 input, depending on input switching
logic.
SIF-Mux
SIF1 input is used for DF-sound and carrier recovery ( double channel filter ).
For L‘ inverted sideband application SIF2 is used instead.
AMSIF input is used for all AM sound norms with switchable input filter.
s
IF gain controlled amplifier‘s
The TDA 6930X incorporates a Video-IF demodulation part (VIF), a AM-
sound demodulation part (AMSIF) and a Section for PIC-carrier recovery +
FM/NICAM SIF conversion (SIF). Each path has its own four-stage capaci-
tively coupled, gain controlled amplifier.
s
AGC‘s
Tuner AGC
A delayed tuner AGC voltage is derived from the VIF-AGC via an inverting
threshold amplifier ( increasing VIF input voltage decreases the AGCOUT
voltage ). Its take over point with positiv control direction is set by means of
a external potentiometer.
To avoid regulation oszillation the input has a shared characteristic and the
output is clamped to min 0.3 V which prevents for coming into gain control
inversion at low regulation voltage levels in several tuner application.
VIF AGCs
The AGC for the video-IF-amplifier (VIF) has a peak detector for both kinds
of modulation. An additional mean value detector will increase the control
current for positive modulation if the input signal decreases more than ca.
15 dB. In this case a hysteresis keeps the high control current until the mean
value increases by ca. 10 dB. This and an extremly large sample time pre-
vents from AGC oszillation with critical signals.
SIF / AMSIF AGC‘s
The AGC‘s for the AM- sound section and PIC-carrier recovery +FM/NICAM
section use envelope detectors with extremely low destortion for the SIF
amplifiers.
相关PDF资料 |
PDF描述 |
|---|---|
| TDA6931X | AM, AUDIO/VIDEO DEMODULATOR, PDSO32 |
| TDA6930S | AUDIO/VIDEO DEMODULATOR, PDIP30 |
| TDA6930X | AUDIO/VIDEO DEMODULATOR, PDSO28 |
| TDA6931X | AUDIO/VIDEO DEMODULATOR, PDSO32 |
| TDA7053AT-T | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TDA7000 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:FM radio circuit |
| TDA7010 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:FM radio circuit |
| TDA7010T | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:FM radio circuit |
| TDA7010T/V3 | 制造商:NXP Semiconductors 功能描述:FM RADIO CIRCUIT SMD 7010 SOIC16 |
| TDA7010T/V3 | 制造商:NXP Semiconductors 功能描述:FM RADIO CIRCUIT SMD 7010 SOIC16 |
发布紧急采购，3分钟左右您将得到回复。