August 1999
PRELIMINARY
ML6427
75W Quad Video Cable Drivers and Filters
with Switchable Inputs
GENERAL DESCRIPTION
The ML6427 is a quad 4
th
-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
SCART and EVC cables are supported for composite,
component, and RGB video.
1V
P-P
input signals from DACs are AC coupled into the
ML6427 where they are DC restored. Outputs are AC
coupled and drive 2V
P-P
into a 150W load. The ML6427
can provide DC coupled outputs for certain applications.
A fifth unfiltered channel is provided to support an
additional analog composite video input. A swapping
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.
FEATURES
s
Cable drivers for Peritel (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-slave configuration allows up to 8 multiplexed,
filtered output signals
s
s
s
s
s
s
s
s
BLOCK DIAGRAM
SYNCIN
2
SYNC
TIMER
17
VCCORGB
UNFILTERED CHANNEL
TRANSCONDUCTANCE
ERROR AMP
22
VCCOCV
6
VCC
14
SWAP CVU
13
SWAP CVF
SYNCIN
23
SYNCOUT
24
3
4
CVINFA/Y2*
CVINFB/Y3*
RINA/Y4
RINB/Y5
MUX
MUX
+
–
0.5V
×2
SWAP
MUX
SYNC
TIMER
REQUIRED
SYNC STRIP
TRANSCONDUCTANCE
ERROR AMP
+
–
CVOUT1/YOUTA
21
4th-ORDER
FILTER
×2
CVOUT/YOUTB
20
7
8
0.5V
4th-ORDER
FILTER
×2
TRANSCONDUCTANCE
ERROR AMP
ROUT/YOUTC
18
+
–
9
GINA/Y6
MUX
TRANSCONDUCTANCE
ERROR AMP
0.5V
4th-ORDER
FILTER
×2
GOUT/YOUTD
16
GINB/Y2
10
BINA/C1
11
BINB/C2
12
A/B MUX
1
+
–
0.5V
4th-ORDER
FILTER
×2
BOUT/COUT
15
MUX
TRANSCONDUCTANCE
ERROR AMP
+
–
0.75V
GNDO
19
GND
5
*CAN ALSO INPUT SYNC ON GREEN SIGNALS
1
ML6427
PIN CONFIGURATION
ML6427
24-Pin SOIC (S24)
A/B MUX
CVINU/Y1
CVINFA/Y2
CVINFB/Y3
GND
VCC
RINA/Y4
RINB/Y5
GINA/Y6
GINB/Y7
BINA/C1
BINB/C2
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
SYNCOUT
SYNCIN
VCCOCV
CVOUT1/YOUTA
CVOUT2/YOUTB
GNDO
ROUT/YOUTC
VCCORGB
GOUT/YOUTD
BOUT/COUT
SWAP CVU
SWAP CVF
TOP VIEW
2
ML6427
PIN DESCRIPTION
PIN
NAME
FUNCTION
PIN
NAME
FUNCTION
1
A/B MUX
Logic input pin to select between
Bank <A> or <B> of the CV, RGB,
or Y/C inputs. Internally pulled high.
Unfiltered analog composite video
or luma video input. Internally
pulled high. A composite or luma or
green signal must be present on
either the CV
INF
A/Y2 or the CV
INF
B/
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).
Filtered analog composite video or
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
INF
A/Y2 or the CV
INF
B/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).
Filtered analog composite video or
luma video input for Bank <B>.
Note that SYNC is stripped from this
signal for the other channels.
Analog ground
Analog 5V supply
Filtered analog RED video or luma
video input for Bank <A>
Filtered analog RED video or luma
video input for Bank <B>
Filtered analog GREEN video or
luma video input for Bank <A>
Filtered analog GREEN video or
luma video input for Bank <B>
Filtered analog BLUE video or
chroma video input for Bank <A>
12 B
IN
B/C2
13 SWAP CVF
Filtered analog BLUE video or
chroma video input for Bank <B>
Logic input pin to select whether
the outputs of CV
OUT
1/Y
OUT
A and
CV
OUT
2/Y
OUT
B are from filtered or
unfiltered CV sources. See Table 1.
Internally pulled low.
Logic input pin to select whether
the outputs of CV
OUT
1/Y
OUT
A and
CV
OUT
2/Y
OUT
B are from filtered or
unfiltered CV sources. See Table 1.
Internally pulled low.
Analog BLUE video output or
chroma output from either B
IN
A/C1
or B
IN
B/C2
Analog GREEN video output or
luma output from either G
IN
A/Y6 or
G
IN
B/Y7
5V power supply for output buffers
of the RGB drivers
Analog RED video output or luma
output from either R
IN
A/Y4 or R
IN
B/
Y5
Ground for output buffers
2
CV
INU
/Y1
14 SWAP CVU
15 B
OUT
/C
OUT
3
CV
INF
A/Y2
16 G
OUT
/Y
OUT
D
17 V
CCO
RGB
18 R
OUT
/Y
OUT
C
19 GNDO
4
CV
INF
B/Y3
20 CV
OUT
2/Y
OUT
B Composite video output for channel
2 or luma output.
21 CV
OUT
1/Y
OUT
A Composite video output for channel
1 or luma output.
22 V
CCO
CV
23 SYNCIN
5V power supply for output buffers
of the CV drivers.
Input for an external H-sync logic
signal for filtered channels. TTL or
CMOS. For normal operation
SYNCOUT is connected to
SYNCIN.
Logic output for H-sync detect for
CV
INF
A/Y2 or CV
INF
B/Y3. TTL or
CMOS. For normal operation
SYNCOUT is connected to
SYNCIN.
5
6
7
8
9
GND
V
CC
R
IN
A/Y4
R
IN
B / Y5
G
IN
A/Y6
24 SYNCOUT
10 G
IN
B/Y7
11 B
IN
A/C1
3
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
device operation is not implied.
V
CC ..................................................................................................
6V
Junction Temperature ............................................. 150°C
ESD ..................................................................... >2000V
Storage Temperature Range...................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) ..................... 260°C
Thermal Resistance (q
JA
) ...................................... 80°C/W
OPERATING CONDITIONS
Temperature Range ........................................ 0°C to 70°C
V
DD
Range ................................................... 4.5V to 5.5V
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, V
CC
= 5V ±10%, T
A
= Operating Temperature Range (Note 1)
SYMBOL
I
CC
A
V
V
SYNC
PARAMETER
Supply Current
Low Frequency Gain (All Channels)
CONDITIONS
No Load (V
CC
= 5V)
V
IN
= 100mV
P-P
at 300kHz
5.34
0.6
1.2
0.7
MIN
TYP
90
6.0
0.9
1.4
1.0
10
4.5
6.7
7.1
1.5
–35
–41
6.65
1.1
1.5
1.2
MAX
UNITS
mA
dB
V
V
V
ms
MHz
MHz
dB
dB
Channel Sync Output Level
CV/Y, R/Y, G/Y
Sync Present and Clamp Settled
B/C
Unfiltered
Sync Present and Clamp Settled
Sync Present and Clamp Settled
Settled to Within 10mV, C
IN
=0.1µF
All Outputs
All Outputs (With no Peaking Cap.
See Figures 2 and 13)
All Outputs
All Filtered Channels
f
IN
= 27MHz to 100MHz worst case
(See Figures 2 and 13)
t
CLAMP
f
0.5dB
f
C
0.8f
C
f
SB
Clamp Response Time
0.5dB Bandwidth
(Flatness. All Filtered Channels)
–3dB Bandwidth
(Flatness. All Filtered Channels)
0.8 x f
C
Attenuation, All Filtered Channels
Stopband Rejection
V
i
NOISE
OS
I
SC
C
L
dG
dF
T
HD
X
TALK
Input Signal Dynamic Range (All Channels) AC Coupled
Output Noise (All Channels)
Peak Overshoot (All Channels)
Over a Frequency Band
of 25Hz-50MHz
2V
P-P
Output Pulse
1
1.25
1
4.3
120
35
0.4
0.4
0.4
–55
V
P-P
mV
RMS
%
mA
pF
%
º
%
dB
Output Short Circuit Current (All Channels) Note 2
Output Load Capacitance (All Channels)
Differential Gain (All Channels)
Differential Phase (All Channels)
Output Distortion (All Channels)
Crosstalk
Load at the Output Pin
All Outputs
All Outputs
V
OUT
= 1.8V
P-P
at 3.58/4.43MHz
Input of 0.5V
P-P
at 3.58/4.43MHz
on any channel to output of any
other channel
Input A/B MUX Crosstalk
Swap Mux Crosstalk
Input of 0.5V
P-P
at 3.58/4.43MHz
Input of 0.5V
P-P
at 3.58/4.43MHz
–54
–52
dB
dB
4
ML6427
ELECTRICAL CHARACTERISTICS
(Continued)
SYMBOL
PSRR
t
pd
Dt
pd
PARAMETER
PSRR (All Channels)
Group Delay (All Channels)
Group Delay Deviation from Flatness
CONDITIONS
0.5V
P-P
(100kHz) at V
CC
at 100kHz
to 3.58MHz (NTSC)
to 4.43MHz (PAL)
(All Channels)
V
IH
V
IL
Note 1:
Note 2:
MIN
TYP
–39
60
4
7
12
MAX
UNITS
dB
ns
ns
ns
ns
V
to 10MHz
A/B MUX, SWAP CVU, SWAP CVF
A/B MUX, SWAP CVU, SWAP CVF
2.5
Input Voltage Logic High
Input Voltage Logic Low
1
V
Limits are guaranteed by 100% testing, sampling, or correlation with worst case test conditions.
Sustained short circuit protection limited to 10 seconds.
5
