- 您現(xiàn)在的位置：買賣IC網 > PDF目錄384522 > ISL59111 (Intersil Corporation) 8MHz Rail-to-Rail Composite Video Driver(8MHz軌對軌復合視頻信號驅動器) PDF資料下載
參數(shù)資料
| 型號： | ISL59111 |
| 廠商： | Intersil Corporation |
| 英文描述： | 8MHz Rail-to-Rail Composite Video Driver(8MHz軌對軌復合視頻信號驅動器) |
| 中文描述： | 8MHz的軌到軌復合視頻驅動程序（8MHz的軌對軌復合視頻信號驅動器） |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 473K |
| 代理商： | ISL59111 |
7
FN6172.4
April 19, 2007
Application Information
The ISL59111 is a single supply rail-to-rail output amplifier
achieving a -3dB bandwidth of around 8MHz and slew rate
of about 40V/μs while demanding only 2mA of supply
current. This part is ideally suited for applications with
specific micropower consumption and high bandwidth
demands. As the performance characteristics above and the
features described below, the ISL59111 is designed to be
very attractive for portable composite video applications.
The ISL59111 features a sync clamp, low pass function, and
SAG network at the output facilitating reduction of typically
large AC coupling capacitors. See Figure 22.
Internal Sync Clamp
The typical embedded video DAC operates from a ground
referenced single supply. This becomes an issue because
the lower level of the sync pulse output may be at a 0V
reference level to some positive level. The problem is
presenting a 0V input to most single supply driven amplifiers
will saturate the output stage of the amplifier resulting in a
clipped sync tip and degrading the video image. A larger
positive reference may offset the input above its positive
range.
The ISL59111 features an internal sync clamp and offset
function to level shift the entire video signal to the best level
before it reaches the input of the amplifier stage. These
features are also helpful to avoid saturation of the output
stage of the amplifier by setting the signal closer to the best
voltage range.
The simplified block diagram of the ISL59111 in Figure 22 is
divided into four sections. The first, Section A is the Sync
Clamp. The AC coupled video sync signal is pulled negative
by a current source at the input of the comparator amplifier.
When the sync tip goes below the comparator threshold the
output comparator is driven negative, The PMOS device
turns on clamping sync tip to near ground level. The network
triggers on the sync tip of video signal.
The Sallen Key Low Pass Filter
The Sallen Key is a classic low pass configuration illustrated
in Figure 22. This provides a very stable low pass function,
and in the case of the ISL59111, a three-pole roll-off at
around 8MHz. The three-pole function is accomplished with
an RC low pass network placed in series with and before the
Sallen Key. One pole provided by the RC network and poles
two and three provided by the Sallen Key for a nice three-
pole roll-off at around 8MHz. If more aggressive, multiple-
pole roll-offs are needed, multiple ISL59111 can be placed in
series. There will, of course, be a loss of bandwidth as
additional devices are added.
AC Output Coupling and the SAG Network
Composite video signals carry viable information at
frequencies as low as 30Hz up to 5MHz. When a video
system output is AC coupled it is critical that the filter
represented by the output coupling capacitor and the
-
+
+
–
-
+
IN
R
IN
C
IN
V
DD
IN
EN
GND
V
DD
V
DD
EN=GND: SHUTDOWN I
~0
EN=V
DD
: ACTIVE I
DD
~1.5mA
R
1
R
2
R
3
C
1
C
3
V
DC
C
2
R
6
R
5
R
4
R
7
OUT
SAG
C
5
C
4
R
OUT
R
L
75
Ω
SYNC CLAMP
SALLEN KEY LOW PASS FILTER
SAG
NETWORK
AC COUPLING
CAPACITOR
100nF
47μF
22μF
75
Ω
FIGURE 22. BLOCK DIAGRAM
ISL59111
相關PDF資料 |
PDF描述 |
|---|---|
| ISL59114 | YC (S-video) to Composite Video Driver with LPF |
| ISL59114IRUZ-T7 | YC (S-video) to Composite Video Driver with LPF |
| ISL59115 | Triple Channel Video Driver with LPF |
| ISL59115IRUZ-T7 | Triple Channel Video Driver with LPF |
| ISL59116IIZ | YC to Composite Video Driver with LPF |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ISL59111_07 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:8MHz Rail-to-Rail Composite Video Driver |
| ISL59111IIZ | 制造商:Intersil Corporation 功能描述:IC SM VIDEO DRIVER RR/O 8MHZ |
| ISL59111IIZ-T7 | 功能描述:IC VIDEO DRVR R-R 8MHZ 6-CSP RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 視頻放大器和頻緩沖器 系列:- 標準包裝:1,000 系列:- 應用:驅動器 輸出類型:差分 電路數(shù):3 -3db帶寬:350MHz 轉換速率:1000 V/µs 電流 - 電源:14.5mA 電流 - 輸出 / 通道:60mA 電壓 - 電源，單路/雙路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安裝類型:表面貼裝 封裝/外殼:20-VFQFN 裸露焊盤 供應商設備封裝:20-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) |
| ISL59111IZ-T7 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:8MHz Rail-to-Rail Composite Video Driver |
| ISL59112 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:40MHz Rail-to-Rail Video Buffer |
發(fā)布緊急采購，3分鐘左右您將得到回復。