1
Auto-Adjusting Sync Separator for HD and SD Video
ISL59885
The ISL59885 video sync separator extracts sync timing
information from both standard and non-standard video inputs
in the presence of Macrovision pulses. The ISL59885 provides
horizontal, vertical, and composite sync outputs as well as
SD/HDTV detection. An auto input frequency detect feature
automatically adapts to a wide range of video standards (it
does not need a different RSET resistor for different
frequencies). The vertical sync pulse is output on the rising
edge of the first vertical serration following the vertical
pre-equalizing string. For non-standard vertical inputs, a
default vertical pulse is output when the vertical signal stays
low for longer than the vertical sync default delay time. The
horizontal output gives horizontal timing with pre/post
equalizing pulses. Fixed 70mV sync tip slicing provides sync
edge detection when the video input level is between 0.5VP-P
and 2VP-P.
The ISL59885 is available in an 8 Ld SOIC package and is
specified for operation over the full -40°C to +85°C
temperature range.
Features
NTSC, PAL, SECAM, HDTV, Non-standard Video Sync
Separation
Fixed 70mV Slicing of Video Input Levels from 0.5VP-P to
2VP-P
Single 3V to 5V Supply
Composite Sync Output
Vertical Output
Horizontal Output
HDTV Detection
Macrovision Compatible
Available in 8 Ld SOIC Package
Pb-free (RoHS Compliant)
Applications
High-definition Video Equipment
Related Literature
AN1269, “One Transistor Enables Clean HDTV and NTSC
Video Sync Separation”
AN1316, “One Transistor Enables Clean HDTV and NTSC
Video Sync Separation”
TB476, “Regenerating HSYNC from Corrupted SOG or CSYNC during VSYNC”
-
+
HD
DETECTOR
V SYNC
H SYNC
REF
GEN
1
5
3
7
6
4
2
8
RF
620
CF
510pF
C1
0.1F
C3
SYNC
TIP
70mV
SLICE
COMPOSITE
VIDEO IN
GND
CSET
COMPOSITE
SYNC
HD
VERTICAL
SYNC OUT
HORIZONTAL
SYNC OUT
VDD
5V
VDD
C2
0.1F
CLAMP
COMP.
SLICE
1.57V
SYNC TIP REF
1.5V
2 H
ELIMINATOR
56nF
FIGURE 1. SIMPLIFIED BLOCK DIAGRAM
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
|Copyright Intersil Americas Inc. 2005-2007, 2009, 2011. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
October 31, 2011
FN7442.8