Page 1
August 1999
PRELIMINARY
ML6427
75W Quad Video Cable Drivers and Filters
with Switchable Inputs
GENERAL DESCRIPTION
The ML6427 is a quad 4th-order Butterworth lowpass
reconstruction filter plus quad video amplifier optimized
for minimum overshoot and flat group delay. Each filter
channel has a two-input multiplexer that switches between
two groups of quad video signals. Applications driving
SCAR T and EVC cables are supported for composite,
component, and RGB video.
1V
input signals from DACs are A C coupled into the
P-P
ML6427 where they are DC restored. Outputs are AC
coupled and drive 2V
into a 150W load. The ML6427
P-P
can provide DC coupled outputs for certain applications.
A fifth unfiltered channel is provided to support an
additional analog composite video input. A sw apping
multiplexer between the two composite channels allows
the distribution amplifiers to output from either input.
Several ML6427s can be arranged in a master-slave
configuration where an external sync can be used for CV
and RGB outputs.
BLOCK DIAGRAM
FEATURES
■ Cable drivers for P eritel (SCART), Enhanced Video
Connector (EVC), and standard video connectors, 75W
cable drivers for CV, S-video, and RGB
■ 7.1MHz CV, RGB, and S-video, NTSC or PAL filters
with mux inputs and output channel mux
■ Quad reconstruction filter or dual anti-aliasing filter
■ 43dB stopband attenuation at 27MHz
■ 1dB flatness up to 4.8MHz
■ 12ns group delay flatness up to 10MHz
■ 0.4% differential gain, 0.4º differential phase on all
channels
■ 0.4% total harmonic distortion on all channels
■ Master-sla ve configur ation allo ws up to 8 multiplexed,
filtered output signals
SYNCIN
2
SYNCIN
23
SYNCOUT
24
CV
INF
3
CV
INF
4
RINA/Y4
7
RINB/Y5
8
GINA/Y6
9
GINB/Y2
10
BINA/C1
11
BINB/C2
12
A/B MUX
1
A/Y2*
B/Y3*
UNFILTERED CHANNEL
SYNC
TIMER
SYNC
TIMER
REQUIRED
SYNC STRIP
MUX
MUX
MUX
MUX
TRANSCONDUCTANCE
ERROR AMP
TRANSCONDUCTANCE
ERROR AMP
TRANSCONDUCTANCE
ERROR AMP
TRANSCONDUCTANCE
ERROR AMP
*CAN ALSO INPUT SYNC ON GREEN SIGNALS
+
–
+
–
+
–
+
–
22
V
CV
CCO
ERROR AMP
4th-ORDER
0.5V
4th-ORDER
0.5V
4th-ORDER
0.5V
4th-ORDER
0.75V
FILTER
FILTER
FILTER
FILTER
CC
SWAP CVUV
+
–
0.5V
17 6 1314
V
RGB
CCO
TRANSCONDUCTANCE
SWAP
MUX
SWAP CVF
×2
×2
×2
×2
×2
CV
1/Y
OUT
A
21
B
20
C
18
D
16
15
OUT
CV
OUT/YOUT
R
OUT/YOUT
G
OUT/YOUT
B
OUT/COUT
GNDGNDO
519
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ML6427
PIN CONFIGURATION
A/B MUX
CV
INU
CV
INF
CV
INF
RINA/Y4
RINB/Y5
GINA/Y6
GINB/Y7
BINA/C1
BINB/C2
/Y1
A/Y2
B/Y3
GND
V
CC
ML6427
24-Pin SOIC (S24)
1
2
3
4
5
6
7
8
9
10
11
12
TOP VIEW
24
23
22
21
20
19
18
17
16
15
14
13
SYNCOUT
SYNCIN
V
CV
CCO
CV
1/Y
OUT
CV
2/Y
OUT
GNDO
R
OUT/YOUT
V
RGB
CCO
G
OUT/YOUT
B
OUT/COUT
SWAP CVU
SWAP CVF
OUT
OUT
C
A
B
D
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PIN DESCRIPTION
ML6427
PIN NAME FUNCTION
1A/B MUX Logic input pin to select between
Bank <A> or <B> of the CV, RGB,
or Y/C inputs. Internally pulled high.
2CV
/Y1 Unfiltered analog composite video
INU
or luma video input. Internally
pulled high. A composite or luma or
green signal must be present on
either the CV
A/Y2 or the CV
INF
Y3 input to provide necessary sync
signals to other channels (R, G, B, Y,
C). Otherwise, sync must be
provided at SYNCIN. For RGB
applications the green channel with
sync can be used as an input to this
pin (see RGB Applications section).
3CV
A/Y2 Filtered analog composite video or
INF
luma video input for Bank <A>.
Note that SYNC is stripped from this
signal for the other channels. A
composite or luma or green signal
must be present on either the
CV
A/Y2 or the CV
INF
B/Y3 input
INF
to provide necessary sync signals to
other channels (R, G, B, Y, C).
Otherwise, sync must be provided
at SYNCIN. For RGB applications
the green channel with sync can be
used as an input to this pin (see
RGB Applications section).
INF
B/
PIN NAME FUNCTION
12 BINB/C2 Filtered analog BLUE video or
chroma video input for Bank <B>
13 SWAP CVF Logic input pin to select whether
the outputs of CV
CV
OUT
2/Y
OUT
OUT
1/Y
OUT
A and
B are from filtered or
unfiltered CV sources. See Table 1.
Internally pulled low .
14 SWAP CVU Logic input pin to select whether
the outputs of CV
CV
OUT
2/Y
OUT
OUT
1/Y
OUT
A and
B are from filtered or
unfiltered CV sources. See Table 1.
Internally pulled low .
15 B
OUT/COUT
Analog BLUE video output or
chroma output from either BINA/C1
or BINB/C2
16 G
OUT/YOUT
D Analog GREEN video output or
luma output from either GINA/Y6 or
GINB/Y7
17 V
RGB 5V po wer supply for output buffers
CCO
of the RGB drivers
18 R
OUT/YOUT
C Analog RED video output or luma
output from either RINA/Y4 or RINB/
Y5
19 GNDO Ground for output buffers
4CV
B/Y3 Filtered analog composite video or
INF
luma video input for Bank <B>.
Note that SYNC is stripped from this
signal for the other channels.
5 GND Analog ground
6V
CC
Analog 5V supply
7RINA/Y4 Filtered analog RED video or luma
video input for Bank <A>
8RINB / Y5 Filtered analog RED video or luma
video input for Bank <B>
9GINA/Y6 Filtered analog GREEN video or
luma video input for Bank <A>
10 GINB/Y7 Filtered analog GREEN video or
luma video input for Bank <B>
11 BINA/C1 Filtered analog BLUE video or
chroma video input for Bank <A>
20 CV
OUT
2/Y
B Composite video output for channel
OUT
2 or luma output.
21 CV
OUT
1/Y
A Composite video output for channel
OUT
1 or luma output.
22 V
CV 5V power supply for output buffers
CCO
of the CV drivers.
23 SYNCIN Input for an external H-sync logic
signal for filtered channels. TTL or
CMOS. For normal operation
SYNCOUT is connected to
SYNCIN.
24 SYNCOUT Logic output for H-sync detect for
CV
A/Y2 or CV
INF
B/Y3. TTL or
INF
CMOS. For normal operation
SYNCOUT is connected to
SYNCIN.
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ML6427
ABSOLUTE MAXIMUM RATINGS
Absolute maximum ratings are those values beyond which
the device could be permanently damaged. Absolute
maximum ratings are stress ratings only and functional
Storage Temperature Range...................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................... 260°C
Thermal Resistance (qJA) ......................................80°C/W
device operation is not implied.
OPERATING CONDITIONS
V
..................................................................................................6V
CC
Junction T emperature............................................. 150°C
ESD.....................................................................>2000V
Temperature Range........................................0°C to 70°C
VDD Range...................................................4.5V to 5.5V
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, VCC = 5V ±10%, TA = Operating Temperature Range (Note 1)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
A
V
SYNC
t
CLAMP
f
0.5dB
Supply Current No Load (VCC = 5V) 90 mA
CC
Low Frequency Gain (All Channels) V
V
= 100mV
IN
at 300kHz 5.34 6.0 6.65 dB
P-P
Channel Sync Output Level CV/Y, R/Y, G/Y Sync Present and Clamp Settled 0.6 0.9 1.1 V
B/C Sync Present and Clamp Settled 1.2 1.4 1.5 V
Unfiltered Sync Present and Clamp Settled 0.7 1.0 1.2 V
Clamp Response Time Settled to Within 10mV, CIN=0.1µF 10 ms
0.5dB Bandwidth All Outputs 4.5 MHz
(Flatness. All Filtered Channels)
f
–3dB Bandwidth All Outputs (With no Peaking Cap. 6.7 7.1 MHz
C
(Flatness. All Filtered Channels) See Figures 2 and 13)
0.8f
f
0.8 x fC Attenuation, All Filtered Channels All Outputs 1.5 dB
C
Stopband Rejection All Filtered Channels –35 –41 dB
SB
= 27MHz to 100MHz worst case
f
IN
(See Figures 2 and 13)
V
Input Signal Dynamic Range (All Channels) AC Coupled 1 1.25 V
i
NOISE Output Noise (All Channels) Over a Frequency Band 1 mV
of 25Hz-50MHz
OS Peak Overshoot (All Channels) 2V
I
C
Output Short Circuit Current (All Channels) Note 2 120 mA
SC
Output Load Capacitance (All Channels) Load at the Output Pin 35 pF
L
Output Pulse 4.3 %
P-P
dG Differential Gain (All Channels) All Outputs 0.4 %
dF Differential Phase (All Channels) All Outputs 0.4 º
T
X
TALK
Output Distortion (All Channels) V
HD
Crosstalk Input of 0.5V
OUT
= 1.8V
at 3.58/4.43MHz 0.4 %
P-P
at 3.58/4.43MHz –55 dB
P-P
on any channel to output of any
other channel
Input A/B MUX Crosstalk Input of 0.5V
Swap Mux Crosstalk Input of 0.5V
at 3.58/4.43MHz –54 dB
P-P
at 3.58/4.43MHz –52 dB
P-P
P-P
RMS
4
Page 5
ML6427
ELECTRICAL CHARACTERISTICS (Continued)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
PSRR PSRR (All Channels) 0.5V
t
Dt
V
V
Note 1: Limits are guaranteed by 100% testing, sampling, or correlation with worst case test conditions.
Note 2: Sustained short circuit protection limited to 10 seconds.
Group Delay (All Channels) at 100kHz 60 ns
pd
Group Delay Deviation from Flatness to 3.58MHz (NTSC) 4 ns
pd
(All Channels) to 10MHz 1 2 ns
Input Voltage Logic High A/B MUX, SWAP CVU, SWAP CVF 2.5 V
IH
Input Voltage Logic Low A/B MUX, SWAP CVU, SWAP CVF 1 V
IL
(100kHz) at V
P-P
to 4.43MHz (PAL) 7 ns
CC
–39 dB
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ML6427
FUNCTIONAL DESCRIPTION
The ML6427 is a quad monolithic continuous time analog
video filter designed for reconstructing signals from four
video D/A sources. The ML6427 is intended for use in AC
coupled input and output applications.
The filters approximate a 4th-order Butterworth
characteristic with an optimization tow ard low ov ershoot
and flat group delay. All outputs are capable of driving
2V
into A C coupled 150W video loads with up to 35pF
P-P
of load capacitance at the output pin. They are also
capable of driving a 75W load at 1V
P-P
.
All channels are clamped during sync to establish the
appropriate output voltage swing range. Consequently 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
value of the input coupling capacitors will linearly affect
the clamp response times.
The RGB channels have no pulldown current sources and
are essentially tilt-free. The inputs of the CV channels sink
less than 1µA during active video, resulting in a tilt of less
than 1mV for 220µF output capacitors. A 1000µF
capacitor is recommended for TV applications to minimize
tilt in the CV channels.
SWAP MULTIPLEXER CONTROL
Output pins CV
OUT
1/Y
OUTA
and CV
OUT
2/Y
B are each
OUT
independently selectable among three input sources
(CV
INU
/Y1, CV
A/Y2, or CV
INF
B/Y3) depending on the
INF
state of digital inputs SWAP CVF, SWAP CVU, and A/ B
MUX. This allows the two outputs to remain independent
and pass straight through, or to remain independent but
swapped, or for both outputs to hav e the same signal
sourcing from either CV
INU
/Y1, CV
A/Y2, or CV
INF
INF
B/Y3
(See Table 1). If SWAP CVF is forced to logic low then
CV
THE CV
CV
OR THE CV
CV
If SWAP CVU is high then CV
from either the CV
OUT
OUT
OUT
2/Y
1/Y
2/Y
B is sourced from either the CV
OUT
B/Y3 input. If SWAP CVU is logic low then
INF
A provides video from either the CV
OUT
B/Y3 input. If SWAP CVF is logic high then
INF
provides video from the CV
OUTB
A/Y2 or the CV
INF
OUT
1/Y
OUT
INF
INU
A provides video
B/Y3 input. Both
A/Y2 OR
INF
INF
/Y1 input.
A/Y2
SWAP CVF and SWAP CVU will pull low if they are not
driven.
The ML6427 is robust and stable under all stated load and
input conditions. Bypassing both V
pins directly to
CC
ground ensures this performance. Two ML6427s can be
connected in a master-sla v e sync configuration. When
using this configuration (See Figure 6) only the “master”
ML6427 is required to have a signal with embedded sync
present on the CV
absence of sync on the CV
A/Y2 and CV
INF
INF
A/Y2 and CV
INF
B/Y3 inputs. In the
B/Y3 inputs
INF
of the “slave” ML6427 it will ha v e its SYNCIN input
connected to the SYNCOUT output of the “master”
ML6427.
SYNCIN AND SYNCOUT PINS
Each ML6427 has two sync detectors which control the
DC restore functions. The unfiltered channel has its own
detector , w hic h controls the DC restore function during
the horizontal sync period of the CV
/Y1 input. The
INU
other sync detector controls the DC restore functions for
the filtered channels based upon the composite or luma
silgnal at the CV
A/Y2 or CV
INF
B/Y3 input.
INF
Required Setup: A composite or luma or green signal
must be present on CV
A/Y2 or CV
INF
B/Y3 inputs to
INF
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
A/Y2 or CV
INF
INF
B/Y3.
The SYNCOUT pin provides a logic high when it detects
the horizontal sync of either the CV
A/Y2 or CV
INF
INF
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 neither the CV
nor the CV
B/Y3 has an embedded sync an external
INF
INF
A/Y2
sync can be applied on the SYNCIN pin. In master-slave
configurations the SYNCOUT of a ML6427 master can be
used as the SYNCIN of a ML6427 slave (see Figure 6).
VIDEO I/O DESCRIPTION
Each input is driven b y either a low impedance source or
the output of a 75W 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 150W load at 2V
1V
into a 75W load. At the output pin, up to 35pF of
P-P
P-P
or
load capacitance can be driven without stability or slew
issues. A 220µF AC coupling capacitor is recommended at
the output to reduce power consumption. For DC coupled
outputs see the Typical Applications section.
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 the video inputs (CV
A/Y2, RINA/Y4, GINA/
INF
Y6, BINA/C1) to be enabled. If A/B MUX is logic low then
Bank<B> of video inputs (CV
B
B/C2) will be selected. If the A/B MUX is open it will
INF
B/Y3, RINB/Y5,GINB/Y7,
INF
pull to logic high.
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ML6427
1
0
–1
–2
AMPLITUDE (dB)
–3
–4
0 0.1 1 10
FREQUENCY (MHz)
Figure 1. Passband Flatness (Normalized)
All outputs. Passband is ripple-free.
90
70
20
0
–20
–40
AMPLITUDE (dB)
–60
–80
0.01 0.1 1 10010
FREQUENCY (MHz)
Figure 2. Passband/Stopband Rejection Ratios
(Normalized) All outputs.
50
DELAY (ns)
30
10
159
Figure 3. Group Delay, all Outputs
Low frequency group delay is 62ns. At 3.58MHz group
delay increases by only 4ns. At 4.43MHz group delay
increases by only 7ns. The maximum deviation from flat
group delay of 12ns occurs at 6MHz.
INPUTS OUTPUTS
A/B MUX SWAP CVU SWAP CVF CV
00 0CV
00 1CV
01 0CV
01 1CV
10 0CV
10 1CV
11 0CV
11 1CV
OUT
1/Y
INU
INU
INF
INF
INU
INU
INF
INF
FREQUENCY (MHz)
ACV
OUT
OUT
/Y1 CV
/Y1 CV
B/Y3 CV
B/Y3 CV
/Y1 CV
/Y1 CV
A/Y2 CV
A/Y2 CV
1137481026
2/Y
INF
INU
INF
INU
INF
INU
INF
INU
OUT
BR
OUT/YOUT
CG
OUT/YOUT
DB
OUT/COUT
B/Y3 RINB/Y5 GINB/Y7 BINB/C2
/Y1 RINB/Y5 GINB/Y7 BINB/C2
B/Y3 RINB/Y5 GINB/Y7 BINB/C2
/Y1 RINB/Y5 GINB/Y7 BINB/C2
A/Y2 RINA/Y4 GINA/Y6 BINA/C1
/Y1 RINA/Y4 GINA/Y6 BINA/C1
A/Y2 RINA/Y4 GINA/Y6 BINA/C1
/Y1 RINA/Y4 GINA/Y6 BINA/C1
Table 1. Selecting Composite, Luma, RGB, and Chroma Outputs
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ML6427
TYPICAL APPLICATIONS
BASIC APPLICATIONS
The ML6427 provides c hannels for tw o banks of inputs for
RGB and composite video. The R and G channels can be
used as luma inputs while the B channel can be used as a
chroma input. Composite outputs and an H-sync output
are also provided. There are sev eral configurations
available with the ML6427. F igure 4 includes a list of
basic output options for composite, S-video, TV modulator,
and RGB outputs. Note that each composite channel can
drive a CV load and a channel modulator simultaneously.
The ML6427 standalone can be used as an EVC or SCART
cable driver with nine video sources (75W or low
impedance buffer) and seven video outputs. All inputs and
outputs are A C coupled. When driving seven loads the
power dissipation must be calculated to ensure that the
junction temperature doesn't exceed 120ºC.
EVC CABLE DRIVING
The ML6427 can be configured to driv e composite video,
S-video, and horizontal sync through an EVC connector
(Figure 5). Composite video and S-video inputs are filtered
through 4th-order Butterworth filters and driven through
internal 75W cable drivers. A buffered H-sync output is
also available.
SCART CABLE DRIVING
The ML6427 can be configured either as a SCART cable
driver (Figure 4) or as a SCART cable driver and S-video
driver (Figure 6). A horizontal sync output is also av ailable.
Note that the ML6427 can be used in a master-slave mode
where the SYNCOUT signal from the master is used as the
SYNCIN signal of the slave. This allows the CV, S-video,
and RGB channels to operate under the same sync signals.
Note that in SCAR T applications it is not always necessary
to A C couple the outputs. Systems using SCART
connectors for RGB and composite video can typically
handle between 0 and 2VDC offset (see DC Coupled
Applications section).
RGB APPLICATIONS
RGB video can be filtered and driven through the ML6427
in one of two ways:
1. For sync suppressed RGB the sync signal can be deriv ed
from the composite or luma signal on the inputs of
CV
A/Y2 or CV
INF
2. For RGB with sync on the green signal the green
channel must be fed into either the CV
Y3 input. The sync will be extracted from green and used
on red and bue channels. See also the SYNCIN and
SYNCOUT Sections.
INF
B/Y3.
A/Y2 or CV
INF
INF
B/
OSD (ON-SCREEN DISPLAY) APPLICATIONS
Unfiltered RGB video from an OSD processor needs to be
filtered and then synchronized to a fast blanking interval
or alpha-key signal for later video processing. With the
total filter delay being 80ns ±10ns a D flip-flop or similar
delay element can be used to delay the fast blanking
interval or alpha-key signal. This will synchronize the RGB
and OSD signals (Figure 9).
CCIR656 AND CCIR601 APPLICATIONS
Composite or luma channels can be fed back into an
alternate channel or into another ML6427 (master -slave
configuration) so that approximately 80dB/decade
attenuation outputs are provided. The ML6427 can be
configured for composite and luma loopback (Figure 7).
H-sync outputs are also provided.
CHANNEL MULTIPLEXING
The ML6427 can be configured for multiple composite
channel multiplexing (Figure 8). Composite sources suc h
as VCRs, video game consoles, and camcorders can be
selected using the ML6427 swap mux controls. A/B MUX,
SWAP CVU, and SWAP CVF signals can be used to select
and route from various input sources.
DC COUPLED APPLICATIONS
A 220µF capacitor coupled with a 150W termination
resistor forms a highpass filter which blocks DC w hile
passing the video frequencies and avoiding tilt. Lower
value capacitors, such as 10µF, would create a problem.
By AC coupling the average DC level is zero.
Consequently the output voltages of all channels will be
centered around zero.
Alternately, DC coupling the output of the ML6427 is
allowable. There are several tradeoffs: The average DC
level on the outputs will be 2V; Each output will dissipate
an additional 40mW nominally; The application will need
to accommodate a 1VDC offset sync tip; and it is
recommended to use only one 75W load per output.
However, if it is necessary to drive two loads at a time on
the composite output while DC coupling is used then the
swap–mux and 5th line driver can be configured to enable
the filtered composite signal on both the 4th and 5th line
drivers. This di vides the composite load dri ving
requirement into two line drivers versus one.
Required Setup: A composite or luma or green signal must
be present on the CV
provide necessary sync signals to the other channels (R, G,
B, Y , C). Otherwise, sync must be pro vided at the SYNCIN
pin. For RGB applications, the green channel with sync
can be used as an input to CV
A/Y2 or the CV
INF
INF
B/Y3 input to
INF
A/Y2 or CV
INF
B/Y3.
8
Page 9
TYPICAL APPLICATIONS (Continued)
ML6427
USING THE ML6427 FOR PAL APPLICATIONS
The ML6427 can be optimized for PAL video by adding
frequency peaking to the composite and S-video outputs.
Figure 10 illustrates the use of an additional external
capacitor (330pF) in parallel with the output source
termination resistor . This raises the frequency response
from 1.6dB at 4.8MHz to 0.35dB at 4.8MHz, which
allows for accurate reproduction of the upper sideband of
the PAL subcarrier. Figure 11 shows the frequency
response of PAL video with v arious values of peaking
19 5 17 22 6
GNDO V
CV
/Y1
INU
2
CV
A/Y2
INF
3
CV
B/Y3
INF
4
RINA/Y4
7
RINB/Y5
8
GINA/Y6
9
GINB/Y7
10
BINA/C1
11
BINB/C2
12
SYNCIN SYNCOUT SWAP CVF SWAP CVUA/B MUX
23 24 1 13 14
GND
INPUTS
Bank A: RGB, CV filtered path
Bank B: RGB, CV filtered path
Other: CV unfiltered path, Sync IN (slave mode)
CCO
ML6427
RGB V
CCO
CV V
CV
OUT
CV
OUT
R
OUT/YOUT
G
OUT/YOUT
B
CC
1/Y
OUT
2/Y
OUT
OUT/COUT
A
B
C
D
capacitors (220pF, 270pF, 330pF and none) between 0 and
10MHz.
For NTSC applications without the peaking capacitor the
rejection at 27MHz is 42dB (typical). For PAL applications
with the peaking capacitor the rejection at 27MHz is 38dB
(typical). See Figure 12. The differential group delay,
shown in Figure 13 with and without a peaking capacitor
(220pF, 270pF, and 330pF and none), varies slightly with
capacitance from 8ns to 13ns.
220µF
75Ω
21
220µF
75Ω
20
220µF
18
16
15
75Ω
220µF
75Ω
220µF
75Ω
OPTIONAL FOR DC COUPLED APPLICATIONS
OUTPUTS
Option 1: 2 CV outputs + 2 TV modulator outputs, 1 RGB output
Option 2: 2 CV outputs + 1 TV modulator output, 1 S-video output
Other: Sync output (buffered stripped sync)
VIDEO CABLES
CV/Y
MODULATOR
CV/Y
MODULATOR
R/Y
G/Y
B/C
H SYNC OUT
Figure 4. Basic Application for NTSC
19 5 17 22 6
COMPOSITE
VIDEO IN
LUMA IN
CHROMA IN
GNDO V
CV
/Y1
INU
2
CV
A/Y2
INF
3
CV
B/Y3
INF
4
RINA/Y4
7
RINB/Y5
8
GINA/Y6
9
GINB/Y7
10
BINA/C1
11
BINB/C2
12
SYNCIN SYNCOUT SWAP CVF SWAP CVUA/B MUX
23 24 1 13 14
GND
CCO
ML6427
MASTER
RGB V
CCO
CV V
CV
OUT
CV
OUT
R
OUT/YOUT
G
OUT/YOUT
B
CC
1/Y
OUT
2/Y
OUT
OUT/COUT
A
B
C
D
21
20
18
16
CHROMA
15
LUMA
OUT
OUT
COMPOSITE
VIDEO OUT
S-VIDEO
OUT
H SYNC OUT
Figure 5. EVC (Enhanced Video Connector) Application: S-Video, Composite, plus H-Sync out
TO EVC
CONNECTOR
9
Page 10
ML6427
COMPOSITE
VIDEO IN
LUMA IN
CHROMA IN
R INPUT
G INPUTRGB INPUT
B INPUT
19
GNDO V
CV
/Y1
INU
2
CV
A/Y2
INF
3
CV
B/Y3
INF
4
RINA/Y4
7
RINB/Y5
8
GINA/Y6
9
GINB/Y7
10
BINA/C1
11
BINB/C2
12
SYNCIN SYNCOUT SWAP CVF SWAP CVUA/B MUX
23
24
SYNC OUT V
CV
/Y1
INU
2
CV
A/Y2
INF
3
CV
B/Y3
INF
4
RINA/Y4
7
RINB/Y5
8
GINA/Y6
9
GINB/Y7
10
BINA/C1
11
BINB/C2
12
5
GND
24
23
SYNC IN
17
CCO
ML6427
MASTER
1
17
CCO
ML6427
SLAVE
RGB V
RGB V
22
CCO
22
CCO
CV V
CV
OUT
CV
OUT
R
G
13
CV V
CV
OUT
CV
OUT
R
G
6
CC
1/Y
OUT
2/Y
OUT
OUT/YOUT
OUT/YOUT
B
OUT/COUT
14
6
CC
1/Y
OUT
2/Y
OUT
OUT/YOUT
OUT/YOUT
B
OUT/COUT
A
B
C
D
A
B
C
D
21
20
18
16
15
21
20
18
16
15
LUMA
OUT
CHROMA
OUT
R OUTPUT
G OUTPUT
B OUTPUT
COMPOSITE
VIDEO OUT
S-VIDEO
OUT
H SYNC OUT
RGB
VIDEO
OUT
TO SCART
CONNECTOR
10
GNDO GND SWAP CVF SWAP CVUA/B MUX
19
5
1
13
14
Figure 6. SCART (Peritel) + S-Video Application: S-Video, RGB, Composite, plus H-Sync out
Page 11
COMPOSITE
VIDEO IN
1kΩ
LUMA IN
CHROMA IN
CV
ML6427
1kΩ
19 5 17 22 6
GNDO V
CV
/Y1
INU
2
CV
3
CV
4
RINA/Y4
7
RINB/Y5
8
GINA/Y6
9
GINB/Y7
10
BINA/C1
11
BINB/C2
12
INF
INF
A/Y2
B/Y3
0
GND
CCO
ML6427
MASTER
RGB V
CCO
CV V
CV
OUT
CV
OUT
R
OUT/YOUT
G
OUT/YOUT
B
CC
1/Y
OUT
2/Y
OUT
OUT/COUT
A
21
B
20
C
18
D
16
15
CV
L
CV+
(80dB/DECADE ATTENUATION)
LUMA OUT
CHROMA OUT
COMPOSITE
VIDEO OUT
S-VIDEO
OUT
COMPOSITE
VIDEO IN
LUMA IN
1kΩ
CHROMA IN
SYNCIN SYNCOUT SWAP CVF SWAP CVUA/B MUX
23 24 1 13 14
Figure 7a. Composite Loopback (Cascaded Filters) for Additional Attenuation
1kΩ
19 5 17 22 6
GNDO V
CV
/Y1
INU
2
CV
A/Y2
INF
3
CV
B/Y3
INF
4
RINA/Y4
7
Y
RINB/Y5
0
8
GINA/Y6
9
GINB/Y7
10
BINA/C1
11
BINB/C2
12
GND
CCO
ML6427
MASTER
RGB V
CCO
CV V
CV
OUT
CV
OUT
R
OUT/YOUT
G
OUT/YOUT
B
CC
1/Y
OUT
2/Y
OUT
OUT/COUT
A
21
B
20
C
18
D
16
15
COMPOSITE
VIDEO OUT
Y
Y+
(80dB/DECADE ATTENUATION)
CHROMA OUT
H SYNC OUT
L
S-VIDEO
OUT
SYNCIN SYNCOUT SWAP CVF SWAP CVUA/B MUX
23 24 1 13 14
H SYNC OUT
Figure 7b. Luma Loopback (Cascaded Filters) for Additional Attenuation
Figure 7. CCIR656 and CCIR601 Application: Composite and Luma Loopback, plus H-Sync out
11
Page 12
ML6427
VIDEO PLAYER VIDEO RECORDER
COMPOSITE VIDEO IN
0.1µF
VIDEO GAME
CONSOLE
CAMCORDER
0.1µF
0.1µF
CV
CV
CV
19 5 17 22 6
GNDO V
CV
1
2
3
10
11
12
/Y1
INU
2
CV
A/Y2
INF
3
CV
B/Y3
INF
4
RINA/Y4
7
RINB/Y5
8
GINA/Y6
9
GINB/Y7
BINA/C1
BINB/C2
SYNCIN SYNCOUT SWAP CVF SWAP CVUA/B MUX
23 24 1 13 14
GND
CCO
ML6427
MASTER
RGB V
CCO
CV V
CV
OUT
CV
OUT
R
OUT/YOUT
G
OUT/YOUT
B
CC
1/Y
OUT
2/Y
OUT
OUT/COUT
MODULATOR
A
21
CV OUTPUT 1
B
COMPOSITE VIDEO OUT
20
C
18
D
16
15
MODULATOR
220µF
220µF
TV
12
INPUTS OUTPUTS
A/B MUX SWAP CVU SWAP CVF CV
OUT
1/Y
ACV
OUT
OUT
2/Y
OUT
B
0 0 0 Video Pla yer Camcorder
0 0 1 Video Pla yer Video Player
0 1 0 Camcorder Camcorder
0 1 1 Camcorder Video Player
1 0 0 Video Pla yer Video Game Console
1 0 1 Video Player Video Player
1 1 0 Video Game Console Video Game Console
1 1 1 Video Game Console Video Player
Figure 8. Composite Channel Swapping Application: Multiple Composite Channel Multiplexing
Page 13
ML6427
OSD
(ON-SCREEN DISPLAY)
PROCESSOR
ML6431
GENLOCK/CLOCK
GENERATOR
13.5MHz/
27MHz
Figure 9. Synchronizing the Filter Delay with Fast Blanking or Alpha-Key Signals in OSD Applications
19 5 17 22 6
GNDO V
CV
/Y1
INU
2
CV
A/Y2
INF
3
CV
B/Y3
INF
4
RINA/Y4
7
RINB/Y5
8
GINA/Y6
9
GINB/Y7
10
BINA/C1
11
BINB/C2
12
SYNCIN SYNCOUT SWAP CVF SWAP CVUA/B MUX
23 24 1 13 14
GND
CCO
ML6427
RGB V
CCO
UNFILTERED
R
G
B
FAST BLANKING INTERVAL
OR ALPHA-KEY SIGNAL
CV V
CV
OUT
CV
OUT
R
OUT/YOUT
G
OUT/YOUT
B
CC
1/Y
2/Y
OUT/COUT
SCART/QUAD VIDEO
FILTER AND DRIVER
DELAY AT 13.5MHz IS APPROXIMATELY 74ns
A
OUT
21
B
OUT
20
C
18
D
16
15
80ns±10ns DELAY FILTERED
R
ML6427
DQ
220µF
220µF
220µF
220µF
220µF
OPTIONAL FOR DC COUPLED APPLICATIONS
G
B
75Ω
75Ω
75Ω
75Ω
75Ω
OUTPUT
OUTPUT
OUTPUT
330pF
330pF
TO MUX OR
OTHER
PROCESSING
FAST BLANKING
INTERVAL
OR ALPHA-KEY
SIGNAL
VIDEO CABLES
CV/Y
MODULATOR
CV/Y
MODULATOR
R/Y
G/Y
B/C
H SYNC OUT
INPUTS
Bank A: RGB, CV filtered path
Bank B: RGB, CV filtered path
Other: CV unfiltered path, Sync IN (slave mode)
OUTPUTS
Option 1: 2 CV outputs + 2 TV modulator outputs, 1 RGB output
Option 2: 2 CV outputs + 1 TV modulator output, 1 S-video output
Other: Sync output (buffered stripped sync)
Figure 10. Basic Application for PAL
13
Page 14
ML6427
–0.5
0
0.35dB
WITH
PEAKING
0.5
1.7dB
1
AMPLITUDE (dB)
1.5
330pF
2
2.5
04682
270pF
220pF
none
1573
WITHOUT
PEAKING
FREQUENCY (MHz)
Figure 11. NTSC/PAL Video Frequency Response With and Without Peaking Capacitor
0
10
NTSC/PAL
–38dB
20
WITH
PEAKING
30
AMPLITUDE (dB)
40
50
0121830246
31521279
330pF
270pF
220pF
none
NTSC/PAL
–42dB
WITHOUT
PEAKING
FREQUENCY (MHz)
Figure 12. Stopband Rejection at 27MHz With and Without Peaking Capacitor
10
8ns
GROUP
DELAY
WITHOUT
PEAKING
0
13ns GROUP
DELAY
DELAY (ns)
–10
–20
0461082
15793
WITH 330pF
PEAKING
330pF
270pF
220pF
none
FREQUENCY (MHz)
14
Figure 13. Group Delay at 5.5MHz (PAL) With and Without Peaking Capacitor
Page 15
JP5
32 1
R7
1kΩ
CVIN1
CVIN2
YIN1
YIN2
1
CIN
JP2
123
HSYNCIN
JP6
123
B
IN
G
IN
R
IN
CIN2
GND
R1 75Ω
R2 75Ω
R3 75Ω
R4 75Ω
R5 75Ω
R6 1kΩ
JP1
123
R8 1kΩ
R9 1kΩ
R10 1kΩ
R11 75Ω
R12 75Ω
R13 75Ω
5V
GND
C14 0.1µF
C15 0.1µF
C16 0.1µF
C17 0.1µF
C18 0.1µF
C19 0.1µF
0.1µF
C20
C21 0.1µF
C22 0.1µF
C23 0.1µF
C24 0.1µF
C25 0.1µF
C26 0.1µF
C27 0.1µF
C28
0.1µF
C12 1µF
C13 0.1µF
2
3
4
7
8
9
10
11
12
SW1-C
2
3
4
7
8
9
10
11
12
FB1
V
CCA
6 1722 195
V
FB2
C10 1µF
C11 0.1µF
CCO
U1
MUX
FOURTH
ORDER
MUX
MUX
MUX
MUX
FILTER
FOURTH
ORDER
FILTER
FOURTH
ORDER
FILTER
FOURTH
ORDER
FILTER
1 14132423
1 14132423
X2
X2
X2
U2
MUX
FOURTH
ORDER
MUX
MUX
MUX
MUX
FOURTH
FOURTH
FOURTH
C29 1µF
C30 0.1µF
V
CCA
FILTER
ORDER
FILTER
ORDER
FILTER
ORDER
FILTER
X2
X2
X2
C31 0.1µF
C32 0.1µF
V
CCO
ML6427
LEGEND
JPx
MOVABLE
JUMPER
123
220µF
C2 220µF
21
X2
20
X2
C3 220µF
18
C4 220µF
16
C5 220µF
15
21
X2
C6 220µF
20
X2
C7 220µF
18
C8 220µF
16
C9 220µF
15
56192217
C33 330pF
C34 330pF
SW1-A
SW1-B
PERMANENT
SHORT
R24 75Ω
R23 75Ω
R22 75Ω
R21 75Ω
R20 75Ω
5V
JP3
12 3
JP4
123
R17 75Ω CV
R16 75Ω
R15 75Ω
R14 75Ω
CV
CV
CV
Y
Y
Y
C
B
G
R
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
Y+
OUT
OUT
OUT
1
2
1
2
1
2
1
+
P2—EVC
13
14
15
5
4
5
9
13
17
21
19
16
7
11
15
P1—SCART
Figure 14. Typical Application Schematic
15
Page 16
ML6427
PHYSICAL DIMENSIONS inches (millimeters)
0.600 - 0.614
24
(15.24 - 15.60)
Package: S24
24-Pin SOIC
PIN 1 ID
0.024 - 0.034
(0.61 - 0.86)
(4 PLACES)
0.090 - 0.094
(2.28 - 2.39)
1
0.050 BSC
(1.27 BSC)
ORDERING INFORMATION
PART NUMBER TEMPERATURE RANGE PACKAGE
ML6427CS 0°C to 70°C 24 Pin SOIC (S24)
0.012 - 0.020
(0.30 - 0.51)
0.291 - 0.301
(7.39 - 7.65)
0.095 - 0.107
(2.41 - 2.72)
SEATING PLANE
0.398 - 0.412
(10.11 - 10.47)
0.005 - 0.013
(0.13 - 0.33)
0º - 8º
0.022 - 0.042
(0.56 - 1.07)
0.009 - 0.013
(0.22 - 0.33)
16
08/05/99 Printed in U.S.A.
Page 17
TRADEMARKS
The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is
not intended to be an exhaustive list of all such trademarks.
ACEx™
Bottomless™
CoolFET™
CROSSVOLT™
DOME™
E2CMOS
EnSigna
TM
TM
FACT™
FACT Quiet Series™
FAST
FASTr™
GlobalOptoisolator™
GTO™
HiSeC™
ISOPLANAR™
MICROWIRE™
OPTOLOGIC™
OPTOPLANAR™
P ACMAN™
POP™
PowerTrench
QFET™
QS™
QT Optoelectronics™
Quiet Series™
SILENT SWITCHER
SMART ST ART™
SuperSOT™-3
SuperSOT™-6
SuperSOT™-8
SyncFET™
TinyLogic™
UHC™
VCX™
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER
NOTICE TO ANY PRODUCTS HEREIN T O IMPROVE RELIABILITY , FUNCTION OR DESIGN. FAIRCHILD
DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICA TION OR USE OF ANY PRODUCT
OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS P ATENT
RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORA TION.
As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant into
the body, or (b) support or sustain life, or (c) whose
failure to perform when properly used in accordance
with instructions for use provided in the labeling, can be
reasonably expected to result in significant injury to the
user.
2. A critical component is any component of a life
support device or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.
PRODUCT STA TUS DEFINITIONS
Definition of Terms
Datasheet Identification Product Status Definition
Advance Information
Preliminary
No Identification Needed
Obsolete
Formative or
In Design
First Production
Full Production
Not In Production
This datasheet contains the design specifications for
product development. Specifications may change in
any manner without notice.
This datasheet contains preliminary data, and
supplementary data will be published at a later date.
Fairchild Semiconductor reserves the right to make
changes at any time without notice in order to improve
design.
This datasheet contains final specifications. Fairchild
Semiconductor reserves the right to make changes at
any time without notice in order to improve design.
This datasheet contains specifications on a product
that has been discontinued by Fairchild semiconductor.
The datasheet is printed for reference information only.
Rev. G
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