
ML6429
75
Quad Video Cable Drivers and Filters
with Switchable Inputs
GENERAL DESCRIPTION
The ML6429 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
ML6429, where they are DC restored. Outputs are AC
coupled, and drive 2V
P-P
into a 150
load. The ML6429
can be used with 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 ML6429s can be arranged in a master-slave
configuration where an external sync can be used for CV
and RGB outputs.
BLOCK DIAGRAM
CVINF/Y1*
SYNCIN
23
SYNCOUT
24
CVINUA/Y2*
3
CVINUB/Y3*
GINA/Y6
9
GINB/Y7
10
A/
B
MUX
BINA/C1
11
BINB/C2
12
RINA/Y4
7
RINB/Y5
8
CVOUT1/YOUTA
21
CVOUT2/YOUTB
20
ROUT/YOUTC
18
GOUT/YOUTD
16
BOUT/COUT
15
TRANSCONDUCTANCE
ERROR AMP
4th-ORDER
FILTER
4th-ORDER
FILTER
4th-ORDER
FILTER
4th-ORDER
FILTER
SYNC
TIMER
REQUIRED
SYNC STRIP
SWAP
MUX
MUX
MUX
MUX
MUX
×
2
×
2
×
2
×
2
×
2
TRANSCONDUCTANCE
ERROR AMP
TRANSCONDUCTANCE
ERROR AMP
TRANSCONDUCTANCE
ERROR AMP
TRANSCONDUCTANCE
ERROR AMP
1
GNDO
19
VCCORGB
17
VCCOCV
22
VCC
6
SWAP CVF
14
SWAP CVU
13
GND
5
4
2
SYNC
TIMER
FILTERED CHANNEL
0.5V
+
–
0.5V
+
–
0.5V
+
–
0.5V
+
–
0.75V
+
–
*CAN ALSO INPUT SYNC ON GREEN SIGNALS
FEATURES
I
Cable drivers for Peritel (SCART), Enhanced Video
Connector (EVC), and standard video connectors, 75
cable drivers for CV, S-video, and RGB
I
7.1MHz cutoffs CV, RGB, and S-video, NTSC or PAL
filters with mux inputs and output channel mux
I
7.1MHz to 8.4MHz cutoffs achievable with peaking
capacitor
I
Quad 4
th
-order reconstruction or dual anti-aliasing filter
I
41dB stopband attenuation at 27MHz, 0.5dB flatness
up to 4.5MHz
I
12ns group delay flatness up to 10MHz
I
0.4% differential gain, 0.4o differential phase on all
channels, 0.4% total harmonic distortion on all channels
I
2kV ESD guaranteed
I
Master-slave configuration allows up to 8 multiplexed,
filtered output signals
REV. 1.1 2/8/2001