ML6427 Datasheet, PDF (1/16 Pages) Fairchild Semiconductor – 75W Quad Video Cable Drivers and Filters with Switchable Inputs

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.
BLOCK DIAGRAM
FEATURES
s Cable drivers for Peritel (SCART), Enhanced Video
Connector (EVC), and standard video connectors, 75W
cable drivers for CV, S-video, and RGB
s 7.1MHz CV, RGB, and S-video, NTSC or PAL filters
with mux inputs and output channel mux
s Quad reconstruction filter or dual anti-aliasing filter
s 43dB stopband attenuation at 27MHz
s 1dB flatness up to 4.8MHz
s 12ns group delay flatness up to 10MHz
s 0.4% differential gain, 0.4º differential phase on all
channels
s 0.4% total harmonic distortion on all channels
s Master-slave configuration allows up to 8 multiplexed,
filtered output signals
SYNCIN
2
SYNCIN
23
SYNCOUT
24
CVINFA/Y2*
3
CVINFB/Y3*
4
RINA/Y4
7
RINB/Y5
8
GINA/Y6
9
GINB/Y2
10
BINA/C1
11
BINB/C2
12
A/B MUX
1
SYNC
TIMER
17
VCCORGB
UNFILTERED CHANNEL
22
VCCOCV
6
VCC
TRANSCONDUCTANCE
ERROR AMP
MUX
REQUIRED
SYNC STRIP
SYNC
TIMER
TRANSCONDUCTANCE
ERROR AMP
4th-ORDER
FILTER
MUX
TRANSCONDUCTANCE
ERROR AMP
0.5V
4th-ORDER
FILTER
MUX
TRANSCONDUCTANCE
ERROR AMP
0.5V
4th-ORDER
FILTER
MUX
TRANSCONDUCTANCE
ERROR AMP
0.5V
4th-ORDER
FILTER
0.75V
*CAN ALSO INPUT SYNC ON GREEN SIGNALS
14
SWAP CVU
13
SWAP CVF
0.5V
SWAP
MUX
CVOUT1/YOUTA
×2
21
×2
CVOUT/YOUTB
20
ROUT/YOUTC
×2
18
GOUT/YOUTD
×2
16
×2
BOUT/COUT
15
GNDO
19
GND
5
1