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參數(shù)資料
| 型號： | TDA8501 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 顏色信號轉(zhuǎn)換 |
| 英文描述： | PAL/NTSC encoder |
| 中文描述： | COLOR SIGNAL ENCODER, PDIP24 |
| 封裝： | PLASTIC, SDIP-24 |
| 文件頁數(shù)： | 7/30頁 |
| 文件大?。?/td> | 238K |
| 代理商： | TDA8501 |
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April 1993
7
Philips Semiconductors
Preliminary specification
PAL/NTSC encoder
TDA8501
Fig.3
Low pass filter response for colour
difference signals (PAL mode).
(1) frequency response.
(2) group delay.
Fig.4
Low pass filter response for colour
difference signals (NTSC mode).
(1) frequency response.
(2) group delay.
Low pass filters
The
3dB nominal frequency response level of the low
pass filters are different in PAL and NTSC modes.
PAL mode: bandwidth = 1.35 MHz nominal (see Fig.3).
NTSC mode: bandwidth = 1.1 MHz nominal (see Fig.4).
The signal outputs of the low pass filters are connected to
the signal inputs of the U and V modulators.
U
AND
V M
ODULATORS
Two four-quadrant multipliers are used for quadrature
amplitude modulation of the U and V signals. The level of
harmonics produced by the modulated signals are
minimal, because of real multiplication with sinewave
carriers.
The unbalance of the modulators is minimized by means
of a control loop and two external capacitors, pin 6 for the
U modulator and pin 12 for the V modulator. The timing of
the control loop is triggered by the H/2 pulse, so that during
one sync period the U control is active and during the next
sync period the V control is active. In this way, when U and
V are both zero, the suppressed carrier is guaranteed to be
at a low level.
The internal oscillator circuit generates two sinewave
carriers (0 degree and 90 degree). The '0 degree' (0)
carrier is connected to the U modulator and the '90 degree'
(1) carrier is connected to the V modulator.
PAL mode:
switched sequentially by the H/2 pulse, the V signal is
modulated alternately with the direct and inverse carrier.
the internal H/2 pulse can be forced into a specific phase
by means of an external pulse connected to pin 4 (H/2).
Forcing is active at HIGH level. If not used pin 4 can be
left open-circuit or connected to ground. If pin 4 is left
open, the internally generated H/2 pulse (output) is
connected to this pin.
NTSC mode:
alternation of the V modulation is not allowed. If pin 4 is
not used for set-up control (see Y +SYNC, CVBS and
Chrominance outputs), it can be left open-circuit or
connected to ground.
相關PDF資料 |
PDF描述 |
|---|---|
| TDA8501T | PAL/NTSC encoder |
| TDA8505 | SECAM encoder |
| TDA8510 | 26 W BTL and 2 x 13 W SE power amplifiers |
| TDA8510J | 26 W BTL and 2 x 13 W SE power amplifiers |
| TDA8511 | 4 x 13 W single-ended power amplifiers |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TDA8501/N1,112 | 功能描述:IC ENCODER PAL/NTSC 24-DIP RoHS:是 類別:集成電路 (IC) >> 接口 - 編碼器，解碼器，轉(zhuǎn)換器 系列:- 產(chǎn)品變化通告:Development Systems Discontinuation 26/Apr/2011 標準包裝:1 系列:- 類型:編碼器 應用:DVB-S.2 系統(tǒng) 電壓 - 電源，模擬:- 電壓 - 電源，數(shù)字:- 安裝類型:- 封裝/外殼:模塊 供應商設備封裝:模塊 包裝:散裝 其它名稱:Q4645799 |
| TDA8501T | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:PAL/NTSC encoder |
| TDA8505 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:SECAM encoder |
| TDA8510 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:26 W BTL and 2 x 13 W SE power amplifiers |
| TDA8510J | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:26 W BTL and 2 x 13 W SE power amplifiers |
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