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ML6428

Micro Linear
Part Number ML6428
Manufacturer Micro Linear
Description S-Video Filter and 75 Line Drivers with Summed Composite Output
Published May 7, 2005
Detailed Description ML6428 S-Video Filter and 75W Line Drivers with Summed Composite Output FEATURES s s s GENERAL DESCRIPTION The ML6428 ...
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ML6428
ML6428


Overview
ML6428 S-Video Filter and 75W Line Drivers with Summed Composite Output FEATURES s s s GENERAL DESCRIPTION The ML6428 is a dual Y/C 4th-order Butterworth lowpass video filter optimized for minimum overshoot and flat group delay.
The device also contains a summing circuit to generate filtered composite video.
The Y and C input signals from DACs are AC coupled into the ML6428.
Both channels have DC restore circuitry to clamp the DC input levels during video sync.
The Y channel uses a sync tip clamp.
The CV and the C channels share a feedback clamp.
All outputs must be AC coupled into their loads for the -1 and -3 versions.
The -2 and -4 versions are DC coupled.
All inputs (-1, -2, -3 and -4 versions) are AC coupled.
The Y or C outputs can drive 2VP-P into a 150W load, while the CV output can drive 2VP-P into 75W.
Thus the CV output is capable of driving two independent 150W loads to 2VP-P.
On the CV output, one of the 75W loads can be shorted to ground with no loss of drive to the remaining load.
The Y, C and CV channels have a gain of 2 (6dB) with 1VP-P input levels.
6.
7MHz Y and C filters, with CV out for NTSC or PAL 75W cable line driver for Y, C, CV, and TV modulator 43dB stopband attenuation at 27MHz 1dB flatness up to 4.
8MHz No external frequency select components or clocks 12ns group delay flatness up to 10MHz 5% overshoot on any input edge AC coupled input and output (ML6428CS-1 and -3) AC coupled input and DC coupled output (ML6428CS-2 and -4) 0.
4% differential gain on all channels, 0.
4º differential phase on all channels 0.
7% total harmonic distortion on all channels 5V ±10% operation DC restore with low tilt s s s s s s s s s s BLOCK DIAGRAM VCC 2 VCCO 7 YIN 1 4th-ORDER FILTER 8 BUFFER + YOUT SYNC TIP CLAMP Σ TRANSCONDUCTANCE ERROR AMP + 6 BUFFER CVOUT CIN 4 4th-ORDER FILTER 5 BUFFER COUT 3 GND DATASHEET June, 2000 1 ML6428 TABLE OF CONTENTS General Description .
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