- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383989 > TDA4884 (NXP SEMICONDUCTORS) Advanced monitor video controller for OSD PDF資料下載
參數(shù)資料
| 型號： | TDA4884 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Advanced monitor video controller for OSD |
| 中文描述： | 3 CHANNEL, VIDEO PREAMPLIFIER, PDIP20 |
| 封裝： | 0.300 INCH, PLASTIC, SOT-146-1, DIP-20 |
| 文件頁數(shù)： | 6/28頁 |
| 文件大?。?/td> | 189K |
| 代理商： | TDA4884 |
第1頁第2頁第3頁第4頁第5頁當(dāng)前第6頁第7頁第8頁第9頁第10頁第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
1997 Nov 26
6
Philips Semiconductors
Product specification
Three gain control video pre-amplifier for OSD
TDA4884
to be faster than 75 ns/V during transition from
1 to 3.5 V.
7.4
Vertical blanking
The vertical blanking pulse will be detected if the input
voltage (pin 10) is higher than the threshold voltage for
approximately 320 ns but does not exceed the threshold
for the clamping pulse in the time between. During the
vertical blanking pulse the input clamping is disabled to
avoid misclamping in the event of composite input signals.
The input signal is blanked and the artificial black level is
inserted instead, thus the output signal is at reference
black level. The DC value of the reference black level will
be adjusted by cut-off stabilization (see below).
7.5
Horizontal blanking
During horizontal blanking (pin 9) the output signal is set to
reference black level and output clamping is activated. If
the voltage at pin 9 exceeds the switch-off threshold, the
signal is blanked and switched to ultra-black level for
screen protection and spot suppression during V-flyback.
Ultra-black level is the lowest possible output voltage (at
voltage outputs) and is not dependent on cut-off
stabilization.
7.6
Cut-off and black-level stabilization
For cut-off stabilization (DC coupling to the CRT) and
black-level stabilization (AC coupling) the video signal at
the cathode or the coupling capacitor is divided by an
adjustable voltage divider and fed to the feedback inputs
(pins 18, 15 and 12). During horizontal blanking time this
signal is compared with an internal DC voltage of
approximately 5.8 V. Any difference will lead to a
reference black-level correction by charging or discharging
the integrated capacitor which stores the reference
black-level information between the horizontal blanking
pulses.
7.7
On screen display
For OSD fast switching of control pin 6 to less than 1 V
(e.g. 0.7 V) blanks the input signals. The OSD signals can
easily be inserted to the external cascode transistor
(see Fig.3).
7.8
Test mode
During test mode (pins 9 and 10 connected to V
P
) the
black levels at the voltage outputs (pins 19, 16 and 13) are
set internally to typical 0.5 V, 3 V DC at signal inputs
(pins 2, 5 and 8).
Fig.3 OSD application.
handbook, full pagewidth
MHA919
OSD
fast blanking
4.7 k
1 k
150
220
100 pF
20
channel 1
channel 2
current
output
BFQ235
PH2222
channel 3
OSD
signal input
TDA4884
contrast
17
14
6
depending on
channel gain
1 k
to 10 k
PH2222
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TDA4885 | 150 MHz video controller with I2C-bus |
| TDA4886A | 140 MHz video controller with I2C-bus |
| TDA4886 | 140 MHz video controller with I2C-bus |
| TDA4887 | 160 MHz bus-controlled monitor video preamplifier |
| TDA4887PS | 160 MHz bus-controlled monitor video preamplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA4885 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| TDA4885/V2 | 制造商:NXP Semiconductors 功能描述: |
| TDA4886 | 制造商:PHILIPS-SEMI 功能描述: |
| TDA4886A | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:140 MHz video controller with I2C-bus |
| TDA4887 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:160 MHz bus-controlled monitor video preamplifier |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。