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參數(shù)資料
| 型號： | ISL59111IIZ-T7 |
| 廠商： | Intersil |
| 文件頁數(shù)： | 8/10頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC VIDEO DRVR R-R 8MHZ 6-CSP |
| 標(biāo)準(zhǔn)包裝： | 3,000 |
| 應(yīng)用： | 重構(gòu)濾波器 |
| 輸出類型： | 滿擺幅 |
| 電路數(shù)： | 1 |
| -3db帶寬： | 8MHz |
| 轉(zhuǎn)換速率： | 40 V/µs |
| 電流 - 電源： | 2mA |
| 電流 - 輸出 / 通道： | 115mA |
| 電壓 - 電源，單路/雙路(±)： | 2.5 V ~ 3.6 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 6-WFBGA，CSPBGA |
| 供應(yīng)商設(shè)備封裝： | 6-CSP（1.49x0.99） |
| 包裝： | 帶卷 (TR) |
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/s 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
RIN
CIN
VDD
IN
EN
GND
VDD
EN=GND: SHUTDOWN IDD~0
EN=VDD: ACTIVE IDD~1.5mA
R1
R2
R3
C1
C3
VDC
C2
R6
R5
R4
R7
OUT
SAG
C5
C4
ROUT
RL
SYNC CLAMP
SALLEN KEY LOW PASS FILTER
SAG
NETWORK
AC COUPLING
CAPACITOR
100nF
47F
22F
75
Ω
75
Ω
FIGURE 22. BLOCK DIAGRAM
ISL59111
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| ISL59112_07 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:40MHz Rail-to-Rail Video Buffer |
| ISL59112IEZ | 制造商:Intersil 功能描述:40MHz Rail-to-Rail Video Buffer |
| ISL59112IEZ-EVALZ | 功能描述:EVAL BOARD FOR ISL59112IEZ RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:* 標(biāo)準(zhǔn)包裝:1 系列:PCI Express® (PCIe) 主要目的:接口，收發(fā)器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要屬性:- 次要屬性:- 已供物品:板 |
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