ml6427 Fairchild Semiconductor, ml6427 Datasheet

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ml6427

Manufacturer Part Number
ml6427
Description
75w Quad Video Cable Drivers And Filters With Switchable Inputs
Manufacturer
Fairchild Semiconductor
Datasheet

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GENERAL DESCRIPTION
The ML6427 is a quad 4
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
ML6427 where they are DC restored. Outputs are AC
coupled and drive 2V
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
P-P
input signals from DACs are AC coupled into the
23
24
10
11
12
2
3
4
7
8
9
1
SYNCIN
SYNCIN
SYNCOUT
CV INF A/Y2*
CV INF B/Y3*
R IN A/Y4
R IN B/Y5
G IN A/Y6
G IN B/Y2
B IN A/C1
B IN B/C2
A/B MUX
MUX
MUX
MUX
MUX
P-P
th
TIMER
into a 150W load. The ML6427
SYNC
*CAN ALSO INPUT SYNC ON GREEN SIGNALS
-order Butterworth lowpass
REQUIRED
SYNC STRIP
TRANSCONDUCTANCE
TRANSCONDUCTANCE
TRANSCONDUCTANCE
TRANSCONDUCTANCE
75W Quad Video Cable Drivers and Filters
UNFILTERED CHANNEL
TIMER
SYNC
ERROR AMP
ERROR AMP
ERROR AMP
ERROR AMP
V CCO RGB
17
TRANSCONDUCTANCE
+
+
+
+
0.5V
0.5V
0.5V
0.75V
V CCO CV
ERROR AMP
22
4th-ORDER
4th-ORDER
4th-ORDER
4th-ORDER
FEATURES
FILTER
FILTER
FILTER
FILTER
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
V CC
6
+
with Switchable Inputs
0.5V
SWAP CVU
14
SWAP
MUX
GNDO
13
19
SWAP CVF
GND
2
2
2
2
2
5
CV OUT 1/Y OUT A
CV OUT /Y OUT B
ML6427
G OUT /Y OUT D
R OUT /Y OUT C
B OUT /C OUT
PRELIMINARY
August 1999
21
20
18
16
15
1

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ml6427 Summary of contents

Page 1

... SCART and EVC cables are supported for composite, component, and RGB video. 1V input signals from DACs are AC 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. ...

Page 2

... PIN CONFIGURATION 2 ML6427 24-Pin SOIC (S24) A/B MUX INU / INF A/ INF B/ GND TOP VIEW SYNCOUT SYNCIN V CCO CV CV OUT 1/Y OUT A CV OUT 2/Y OUT B ...

Page 3

... CCO OUT 19 GNDO 20 CV OUT 21 CV OUT 22 V CCO 23 SYNCIN 24 SYNCOUT ML6427 FUNCTION Filtered analog BLUE video or chroma video input for Bank <B> Logic input pin to select whether the outputs of CV 1/Y OUT CV 2/Y B are from filtered or OUT OUT unfiltered CV sources. See Table 1. ...

Page 4

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 .................................................................................................. J unction Temperature ............................................. 150°C ESD ...

Page 5

... 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. (Continued) CONDITIONS 0.5V (100kHz P 100kHz to 3.58MHz (NTSC) to 4.43MHz (PAL) to 10MHz A/B MUX, SWAP CVU, SWAP CVF A/B MUX, SWAP CVU, SWAP CVF ML6427 MIN TYP MAX UNITS – ...

Page 6

... A/Y2 or the CV INF 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 CC ground ensures this performance. Two ML6427s can be connected in a master-slave sync configuration. When using this configuration (See Figure 6) only the “ ...

Page 7

FREQUENCY (MHz) Figure 1. Passband Flatness (Normalized) All outputs. Passband is ripple-free. Low frequency group delay is 62ns. At 3.58MHz group delay increases by only 4ns. At 4.43MHz group delay increases by ...

Page 8

... 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 AC coupled ...

Page 9

... TYPICAL APPLICATIONS 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 ...

Page 10

... B OUT /C OUT SYNCOUT A/B MUX SWAP CVF SWAP CVU SYNC IN V CCO RGB V CCO CV CV OUT 1/Y OUT A CV OUT 2/Y OUT B ML6427 SLAVE R OUT /Y OUT C G OUT /Y OUT D B OUT /C OUT GND A/B MUX SWAP CVF SWAP CVU COMPOSITE ...

Page 11

... A/B MUX SWAP CVF SWAP CVU CCO RGB V CCO OUT 1/Y OUT OUT 2/Y OUT B 20 ML6427 MASTER R OUT /Y OUT OUT /Y OUT (80dB/DECADE ATTENUATION) B OUT /C OUT 15 A/B MUX SWAP CVF SWAP CVU COMPOSITE VIDEO OUT ...

Page 12

... Figure 8. Composite Channel Swapping Application: Multiple Composite Channel Multiplexing GNDO GND V CCO RGB V CCO CV CV INU /Y1 CV INF A/Y2 CV INF B/ A/ B/Y5 ML6427 MASTER B/C2 SYNCIN SYNCOUT A/B MUX SWAP CVF SWAP CVU SWAP CVF CV 1/Y OUT ...

Page 13

... B OUT /C OUT 15 SWAP CVF SWAP CVU 13 14 OUTPUTS Option outputs + 2 TV modulator outputs, 1 RGB output Option outputs + 1 TV modulator output, 1 S-video output Other: Figure 10. Basic Application for PAL ML6427 FILTERED R OUTPUT TO MUX OR G OUTPUT OTHER PROCESSING B OUTPUT FAST BLANKING INTERVAL ...

Page 14

Figure 11. NTSC/PAL Video Frequency Response With and Without Peaking Capacitor Figure 12. Stopband Rejection at 27MHz With and Without Peaking Capacitor Figure 13. Group Delay at 5.5MHz (PAL) With and Without Peaking Capacitor 14 –0.5 0.35dB 0 WITH PEAKING ...

Page 15

... ORDER X2 FILTER C29 1µF C31 0.1µF C30 0.1µF C32 0.1µF V CCA V CCO Figure 14. Typical Application Schematic ML6427 LEGEND JPx PERMANENT MOVABLE SHORT JUMPER OUT 1 220µF R24 75 C2 220µF R23 75 CV OUT 2 Y OUT 1 C33 330pF C3 220µ ...

Page 16

... ML6427 PHYSICAL DIMENSIONS 0.600 - 0.614 (15.24 - 15.60) 24 PIN 0.024 - 0.034 0.050 BSC (0.61 - 0.86) (1.27 BSC) (4 PLACES) 0.090 - 0.094 (2.28 - 2.39) ORDERING INFORMATION PART NUMBER ML6427CS 16 inches (millimeters) Package: S24 24-Pin SOIC 0.291 - 0.301 0.398 - 0.412 (7.39 - 7.65) (10.11 - 10.47) 0.095 - 0.107 (2.41 - 2.72) 0.012 - 0.020 0.005 - 0.013 (0.30 - 0.51) SEATING PLANE (0.13 - 0.33) TEMPERATURE RANGE 0°C to 70°C 0º ...

Page 17

... TRADEMARKS The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended exhaustive list of all such trademarks. ACEx™ FASTr™ Bottomless™ GlobalOptoisolator™ CoolFET™ GTO™ CROSSVOLT™ HiSeC™ DOME™ ...

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