- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383941 > TDA8501 (NXP SEMICONDUCTORS) PAL/NTSC encoder PDF資料下載
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)： | 11/30頁 |
| 文件大小： | 238K |
| 代理商： | TDA8501 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁當(dāng)前第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁
April 1993
11
Philips Semiconductors
Preliminary specification
PAL/NTSC encoder
TDA8501
Oscillator and Filter Control
The internal crystal oscillator is connected to pin 23 which
provides for the external connection of a crystal in series
with a trimmer to ground. It is possible to connect an
external signal source to pin 23, via a capacitor in series
with a resistor. The signal shape is not important.
Figure 11 shows the external components connected to
pin 23 and the required conditions. The minimum AC
current of 50
μ
A must be determined by the resistors
(R
int
and R
ext
) and the voltage of the signal source. For
example, in this way an external sub-carrier, locked to the
sync, can be used.
The
3 dB of the low pass filters and the centre frequency
of the bandpass filter are controlled by the filter control
loop and directly coupled to the value of the frequency of
the oscillator. The external capacitor of the control loop is
connected to pin 15.
PAL mode:
frequency of the oscillator is
4.433618 MHz.
frequency of the oscillator is
3.579545 MHz.
NTSC mode:
Fig.11 Tuning circuit for external signal source.
Sync separator and Pulse shaper
The composite sync (CS) input at pin 24 (via the sync
separator) together with a sawtooth generator provide the
source for all pulses necessary for the processing.
Pulses are used for:
clamping
video blanking
H/2
chrominance blanking
burst pulse generation for adding to U, V
pulses for the modulator offset control.
The value of the sawtooth generator output (current) is
determined by the value of a fixed resistor to ground which
is connected externally at pin 21 (BURST ADJ). When
finer tolerance of the burst position is required, the fixed
resistor is connected in series with a variable
potentiometer to ground. By use of the potentiometer the
burst position at the outputs can be finely adjusted, after
which the pulse width of the burst and the position and
pulse width of all other internal pulses are then
determined. When using a fixed resistor with a tolerance of
2%, a tolerance of 10% of the burst position can be
expected. Timing diagrams of the pulses are provided by
Figs 12 and 13.
H/2 at pin 4 is only necessary in the PAL mode when the
internal H/2 pulse requires locking with an external H/2
phase (two or more encoders locked in same phase). The
forcing of the internal H/2 to a desired phase is possible by
means of an external pulse. Forcing is active at HIGH
level.
For the functioning of Pin 4 in the NTSC mode see also
section Black and Blanking levels in PAL and NTSC
modes.
相關(guān)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(guān)代理商/技術(shù)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(biāo)準(zhǔn)包裝:1 系列:- 類型:編碼器 應(yīng)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(yīng)商設(shè)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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。