ML6428CS-3 MICRO-LINEAR [Micro Linear Corporation], ML6428CS-3 Datasheet

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ML6428CS-3

Manufacturer Part Number
ML6428CS-3
Description
S-Video Filter and 75? Line Drivers with Summed Composite Output
Manufacturer
MICRO-LINEAR [Micro Linear Corporation]
Datasheet
ML6428
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 150 load, while
the CV output can drive 2VP-P into 75 . Thus the CV
output is capable of driving two independent 150
to 2VP-P.
On the CV output, one of the 75 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.
BLOCK DIAGRAM
GENERAL DESCRIPTION
Summed Composite Output
S-Video Filter and 75 Line Drivers with
YIN
CIN
1
4
SYNC TIP CLAMP
TRANSCONDUCTANCE
ERROR AMP
DATASHEET
4th-ORDER
4th-ORDER
loads
FILTER
FILTER
VCC
2
GND
3
VCCO
7
+
+
June, 2000
FEATURES
6.7MHz Y and C filters, with CV out for NTSC or PAL
75
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
cable line driver for Y, C, CV, and TV modulator
BUFFER
BUFFER
BUFFER
8
6
5
YOUT
CVOUT
COUT
1

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ML6428CS-3 Summary of contents

Page 1

... 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) loads 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 ...

Page 2

ML6428 TABLE OF CONTENTS General Description ................................................................................................................................................... 1 Features ...................................................................................................................................................................... 1 Block Diagram ........................................................................................................................................................... 1 Pin Configuration ....................................................................................................................................................... 3 Pin Descriptions ......................................................................................................................................................... 3 Absolute Maximum Ratings ........................................................................................................................................ 4 Operating Conditions ................................................................................................................................................. 4 Electrical Characteristics ..................................................................................................... ....................................... 4 Functional Description ............................................................................................................................................... ...

Page 3

PIN CONFIGURATION PIN DESCRIPTION PIN NAME FUNCTION 1 YIN Luminance input 2 VCC 5V supply for filters and references 3 GND Ground 4 CIN Chrominance input ML6428 8-Pin SOIC (S08 YIN YOUT 2 7 VCC VCCO 3 6 ...

Page 4

ML6428 ELECTRICAL CHARACTERISTICS 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. DC Supply Voltage ........................................ -0.3V to ...

Page 5

ELECTRICAL TABLE (CONTINUED) SYMBOL PARAMETER XTALK Crosstalk PSRR PSRR (All Channels) tpd Group Delay (All Channels) tpd Group Delay Deviation from Flatness (All Channels) tSKEW Skew Between Y & C Outputs Note 1: Limits are guaranteed by 100% testing, sampling, ...

Page 6

... S-Video D/A source. Composite video output is generated by summing the Y and C outputs. The ML6428 is intended for use in AC coupled input and output applications. The ML6428CS- intended for AC coupled input and DC coupled output applications (see Figures 5 and 6). The filters have a 4th-order Butterworth characteristic with an optimization toward low overshoot and flat group delay ...

Page 7

PERFORMANCE DATA 1 0 –1 –2 –3 –4 0 0.1 FREQUENCY (MHz) Figure 1. Passband Flatness All outputs. (Normalized) Passband is ripple-free FREQUENCY (MHz) Figure 3. Group Delay, ...

Page 8

ML6428 TYPICAL APPLICATIONS ML6428-1, -3 0.1µF 1 4th-ORDER YIN FILTER + + 0.1µF 4 4th-ORDER CIN FILTER 0.1µF 1µF Figure 5. AC Coupled S-Video and Composite Video Line Driver for NTSC ML6428-2, -4 0.1µF 1 4th-ORDER YIN ...

Page 9

TYPICAL APPLICATIONS ML6428-1, -3 0.1µF 1 4th-ORDER YIN FILTER + + 0.1µF 4 4th-ORDER CIN FILTER 0.1µF 1µF Figure 7. AC Coupled S-Video and Composite Video Line Driver for PAL ML6428-2, -4 0.1µF 1 4th-ORDER YIN FILTER ...

Page 10

ML6428 TYPICAL APPLICATIONS Figure 9. NTSC/PAL Video Frequency Response With and Without Peaking Capacitor Figure 10. Stopband Rejection at 27MHz With and Without Peaking Capacitor Figure 11. Group Delay at 5.5MHz (PAL) With and Without Peaking Capacitor 10 –0.5 0.35dB ...

Page 11

... PHYSICAL DIMENSIONS inches (millimeters 0.017 - 0.027 (0.43 - 0.69) (4 PLACES) 0.012 - 0.020 0.055 - 0.061 (0.30 - 0.51) (1.40 - 1.55) ORDERING INFORMATION PART NUMBER ML6428CS-1 ML6428CS-2 ML6428CS-3 ML6428CS-4 Package: S08 8-Pin SOIC 0.189 - 0.199 (4.80 - 5.06) 0.148 - 0.158 0.228 - 0.244 PIN 1 ID (3.76 - 4.01) (5.79 - 6.20) 0.050 BSC (1.27 BSC) 0.059 - 0.069 (1.49 - 1.75) 0º - 8º 0.015 - 0.035 ...

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