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參數(shù)資料
| 型號： | ML6429CS |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 消費家電 |
| 英文描述： | 75з Quad Video Cable Drivers and Filters with Switchable Inputs |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO24 |
| 封裝： | SOIC-24 |
| 文件頁數(shù)： | 6/15頁 |
| 文件大?。?/td> | 157K |
| 代理商： | ML6429CS |
ML6429
6
REV. 1.1 2/8/2001
FUNCTIONAL DESCRIPTION
The ML6429 is a quad monolithic continuous time analog
video filter designed for reconstructing signals from four
video D/A sources. The ML6429 is intended for use in AC
coupled input and output applications.
The filters approximate a 4
th
-order Butterworth
characteristic with an optimization toward low overshoot
and flat group delay. All outputs are capable of driving
2V
P-P
into AC coupled 150
video loads, with up to 35pF
of load capacitance at the output pin. Likewise, they are
capable of driving a 75
load at 1V
P-P
.
All channels are clamped during sync to establish the
appropriate output voltage swing range. Thus the input
coupling capacitors do not behave according to the
conventional RC time constant. Clamping for all channels
settles within 10ms of a change in video sources.
Input coupling capacitors of 0.1μF are reccommended for
all channels. During sync, a feedback error amplifier
sources/sinks current to restore the DC level. The net result
is that the average input current is zero. Any change in the
input coupling capacitors value will linearly affect the
clamp response times.
The RGB channels have no pulldown current sources and
are essentially tilt-free. The CV channel's inputs sink less
than 1μA during active video, resulting in a tilt of less than
1mV for a 220 μF. Up to 1000μF recommended to reude
tilt for TV applications.
SWAP MULTIPLEXER CONTROL
Output pins CV
OUT
1/Y
OUT
A
and CV
OUT
2/Y
OUT
B are each
independently selectable between three input sources
(CV
INF,
and CV
INU
A, CV
INU
B) depending on the digital
inputs SWAP CVF, SWAP CVU, and A/
B
MUX. This allows
the two outputs to remain independent and pass straight
through, to remain independent but swapped, or for both
outputs to have the same signal sourcing from either CV
INF
or CV
INF
A, CV
INU
B (See Table 1). If SWAP CVF is forced
to logic low, then CV
OUT2
/Y
OUT
B sources from CV
INU
A/
Y2, CV
INU
B/Y3. If SWAP CVU is logic low, CV
OUT1
/
Y
OUT
A
outputs video from the CV
INU
A, CV
INU
B
input. If
SWAP CVF is logic high, CV
OUT2
/YOUTB
outputs from
CV
INF
/Y1 input. If SWAP CVU is high, CV
OUT1
/Y
OUT
A
outputs from CV
INU
A/Y2 or CV
INU
B/Y3. Both SWAP CVF
and SWAP CVU will pull low if they are not driven.
The ML6429 is robust and stable under all stated load and
input conditions. Bypassing both V
CC
pins directly to
ground ensures this performance. Two ML6429’s can be
connected in a master-slave sync configuration. When
using this configuration, only the “master” ML6429 is
required to have a signal with embedded sync present on
the CV
INU
A, CV
INU
B
input. In the absence of sync on the
CV
INU
A or CV
INU
B
input of the “slave” ML6429, the
“slave” IC will have its SYNC IN input connected to the
SYNC OUT output of the “master” ML6429.
SYNCIN AND SYNCOUT PINS
Each ML6429 has two sync detectors which control the
DC restore functions. The filtered channel has its own
detector, which controls the DC restore function during
the horizontal sync period of the CV
INF
/Y1 input. The
other sync detector controls the DC restore functions for
the filtered channels based upon the composite or luma
input at the CV
INU
A/Y2 or CV
INU
B/Y3 pins.
Required Setup:
A composite or luma or green signal
must be present on CV
INU
A/Y2 or CV
INU
B/Y3 inputs to
provide necessary sync signals to other channels
(R,G,B,Y,C). Otherwise, sync must be provided at the
SYNCIN pin. For RGB applications, the green channel
with sync can be used as an input to CV
INU
A/Y2 or
CV
INU
B/Y3.
The SYNCOUT pin outputs a logic high when it detects
the horizontal sync of either the CV
INU
A/Y2 or CV
INU
B/Y3
input (note that one input is selected by the A/B MUX pin).
The SYNCIN pin is an input for an external H-sync logic
signal to enable or disable the internal DC restore loop for
the filtered channels. When SYNCIN is logic high, the DC
restore function is enabled.
For normal operation, the SYNCOUT pin is connected to
the SYNCIN pin (see Figure 4). If the CV
INU
does not have
an embedded sync, an external sync can be applied on
the SYNCIN pin. In master-slave configurations, the
SYNCOUT of a ML6429 master can be used as the
SYNCIN of a ML6429 slave.
VIDEO I/O DESCRIPTION
Each input is driven by either a low impedance source or
the output of a 75
terminated line. The input is required
to be AC coupled via a 0.1μF coupling capacitor which
gives a nominal clamping time of 10ms. All outputs are
capable of driving an AC coupled 150
load at 2V
P-P
or
1V
P-P
into a 75
load. At the output pin, up to 35pF of
load capacitance can be driven without stability or slew
issues. A 220μF AC coupling capacitor is recommended at
the output to reduce power consumption.
ANALOG MULTIPLEXER CONTROL
The four filter channels each have two input multiplexers
which are paired to select between two four-channel
video sources (
i.e.
, composite video plus RGB component
video).
If A/
B
MUX is forced to logic high, it will select Bank<A>
of video inputs (CV
INU
A/Y2, R
IN
A/Y4, G
IN
A/Y6, B
IN
A/C1)
to be enabled. If A/
B
MUX is logic low, then Bank<B> of
video inputs (CV
INU
B/Y3, R
IN
B/Y5,G
IN
B/Y7, B
IN
B/C2) will
be selected. If the A/
B
MUX is open, it will pull to logic
high.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ML6429CS WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML6429CS-1 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:75з Quad Video Cable Drivers and Filters with Switchable Inputs |
| ML6429CSAB | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ML6429CSX | 功能描述:視頻 IC Cable Driver/Filter 75Ohm Quad Video RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| ML6429CSXAB | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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