ML6429CS Fairchild Semiconductor, ML6429CS Datasheet - Page 5

• Manufacturer Part Number: ML6429CS
• Description: Video ICs Cable Driver/Filter 75Ohm Quad Video
• Manufacturer: Fairchild Semiconductor
• Type: Provide DC coupled outputs for certain applicationsr

Specifications of ML6429CS

• Operating Supply Voltage: 5 V
• Maximum Operating Temperature: 70 C
• Package / Case: SOIC-24
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PRODUCT SPECIFICATION
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 4th-order Butterworth characteris-
tic with an optimization toward low overshoot and flat group
delay. All outputs are capable of driving 2V
pled 150Ω video loads, with up to 35pF of load capacitance
at the output pin. Likewise, they are capable of driving a 75Ω
load at 1V
All channels are clamped during sync to establish the appro-
priate 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 recommended 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 cou-
pling 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
each independently selectable between three input sources
(CV
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
or CV
to logic low, then CV
Y2, CV
Y
If SWAP CVF is logic high, CV
CV
outputs from CV
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
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
CV
CV
REV. 1.0.0 8/28/03
OUT
INF
INU
INU
INF
INF
A outputs video from the CV
/Y1 input. If SWAP CVU is high, CV
B input. In the absence of sync on the CV
B input of the “slave” ML6429, the “slave” IC will
, and CV
INU
A, CV
P-P
B/Y3. If SWAP CVU is logic low, CV
.
OUT
INU
INU
INU
B (See Table 1). If SWAP CVF is forced
1/Y
A, CV
A/Y2 or CV
OUT
OUT
2/Y
INU
A and CV
OUT
B) depending on the digital
OUT
INU
B sources from CV
CC
INU
2/Y
B/Y3. Both SWAP
OUT
pins directly to
A, CV
OUT
2/Y
P-P
OUT
B outputs from
INU
OUT
into AC cou-
1/Y
INU
B input.
OUT
B are
INU
OUT
A or
INU
1/
INF
A,
A
A/
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
controls the DC restore functions for the filtered channels
based upon the composite or luma input at the CV
or CV
Required Setup: A composite or luma or green signal must
be present on CV
necessary sync signals to other channels (R,G,B,Y,C). Other-
wise, sync must be provided at the SYNCIN pin. For RGB
applications, the green channel with sync can be used as an
input to CV
The SYNCOUT pin outputs a logic high when it detects the
horizontal sync of either the CV
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
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 75Ω 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 150Ω load at 2V
75Ω 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
C1) to be enabled. If A/B MUX is logic low, then Bank<B>
of video inputs (CV
C2) will be selected. If the A/B MUX is open, it will pull to
logic high.
INU
B/Y3 pins.
INU
A/Y2 or CV
INU
INU
INU
A/Y2 or CV
INF
A/Y2, R
B/Y3, R
/Y1 input. The other sync detector
INU
B/Y3.
INU
IN
IN
INU
A/Y4, G
B/Y5,G
A/Y2 or CV
B/Y3 inputs to provide
P-P
INU
IN
IN
or 1V
B/Y7, B
A/Y6, B
does not
INU
P-P
INU
B/Y3
IN
ML6429
into a
IN
A/Y2
B/
A/
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