MIC1700 HDTV/SDTV 6th Order Video Filter for Component Video plus Composite Video0 pages

October 2003 1 MIC1700
MIC1700 Micrel
MIC1700
HDTV/SDTV 6th Order Video Filter for Component
Video plus Composite Video
General Description
The MIC1700 is a complete reconstruction filter solution for
high definition set-top boxes.
The device has two independent component inputs (YPRPB
or RGB) selectable via a 2-to-1 multiplexer, and a separate Svideo
input (Y/C). Component channel filters have a selectable
cutoff frequency (8MHz or 36MHz) to support both
standard (SD) and high definition (HD) applications. S-video
filters have fixed cutoff (8MHz) to support legacy composite
applications. In addition, S-video channels are summed to
provide a filtered CV output for an RF modulator or VCR. All
inputs are DC-coupled with a 0V to 1V peak-to-peak range.
All outputs are designed to drive 2V peak-to-peak into
AC-coupled 150Ù loads. This supports 1V peak-to-peak into
a 75Ù load with a 75Ù series source terminator.
Filters have 6th order near Butterworth characteristics with
cutoffs of 8MHz (SD and CV) and 36MHz (HD). These
characteristics are chosen to provide good passband flatness
with sufficient stop band attenuation and minimal group
delay distortion.
The device operates from a 5VDC supply.
Data sheets and support documentation are available at
Micrel’s web site, www.micrel.com.
Typical Application
17
12
18
11
1 28
27
26
25
24
23
22
21
20
19
2
3
4
5
6
7
8
9
10
4.7ìF 0.1ìF
75Ù
75Ù
220ìF
Y1OUT
PROUT
PBOUT
YOUT
COUT
CVOUT
VCC
VCC
MIC1700x-x
MUX
GND
HSEL
Y1A
Y1B
PR1
PR2
GND
PB1
PB2
YIN
CIN
GND
VCC
VCC
VCC
Y1OUT
PROUT
PBOUT
GND
YOUT
COUT
CVOUT
GND
75Ù
75Ù
75Ù
75Ù
75Ù
MUX
HSEL
Y1A
Y1B
Composite YIN
Inputs CIN
PR1
PR2
PB1
PB2
220ìF
220ìF
220ìF
220ìF
220ìF
75Ù
75Ù
75Ù
75Ù
75Ù
Features
• S-video (Y/C) input, S-video and summed (CV) output
• 2 YPR
PB or RGB inputs, YPRPB or RGB output
• YPR
PB/RGB 2-1 input multiplexer
• DC coupled inputs – AC-coupled output drive
• 6db output gain for 75Ù source termination
• Component filters selectable for SD or HD cutoffs
• 6th order Butterworth characteristic
• Flat passband (HD 0.5dB @ 30MHz typ)
• Low group delay distortion (HD: 12ns @ 30MHz typ)
• Single 5V supply
• 28-pin wide body SOIC package (with exposed pad for
improved thermal performance)
Applications
• HDTV
• HDTV set-top boxes
• Video games
• HDTV systems
• DVD players
• Digital satellite set-top boxes
• HDTV monitors
Ordering Information
Part Number Junction Temp. Range Package
MIC1700BWME 0°C to +70°C SOIC-28
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com