EL4102C - Preliminary
500MHz Video Front End: 4-1 MUX, VGA & DC-Restore
Features
General Description
• 4:1 multiplexer with monitor out
• 18dB variable gain amplifier
• DC-restore amplifier
• Digital control serial interface
• ±5V operation
The EL4102C VFE (Video Front End) is designed to perform all of the
input processing functions in an analog video system as well as provide
analog input processing for digital video systems. The EL4102C VFE
contains a 4:1 MUX input, a DC-restore amplifier and a variable gain
amplifier. The MUX input can be used to select which input to use. In a
digital system, the DC-restore and variable gain amplifiers allow the
input signal to be positioned and scaled to give optimum A-to-D con-
versions results. In an analog system these perform the brightness and
contrast operations. A buffered output of the MUX selection is also
available for use as a monitor output.
• 500MHz bandwidth
Applications
• HDTV/DTV Analog Inputs
• Video Projectors
• Computer Monitors
• Set Top Boxes
• Security Video
• Broadcast Video Equipment
With a 500MHz bandwidth and only 50mA supply current, the
EL4102C is ideal for use in portable and fixed projectors, as well as
HDTV, DTV and other high performance video applications.
A 3-wire digital interface enables full control of the input selection, as
well as 0 to -18dB of gain and blanking operations.
The EL4102C is available in the QSOP24 package and is specified for
operation over the -40°C to +85°C temperature range.
Ordering Information
Part No.
Package
Tape & Reel
Outline #
EL4102CU
24-Pin QSOP
MDP0040
Connection Diagram
SAMPLE PULSE
1
2
3
4
5
6
7
8
9
HOLD
GNDL2
IN0
CAP 24
DCREF 23
DCFDBK 22
VFDBK 21
VOUT 20
VS2+ 19
C
H
0.33nF
DCV
V
I/P0
R
GV
+5V
0V
VS1+
IN1
V
I/P1
R
FV
Video Out
R =150Ω
L
GNDI
IN2
+5V
-5V
V
I/P2
Monitor Out
R =150Ω
L
VS- 18
R
FM
-5V
VS-
MOUT 17
MFDBK 16
GNDL 15
PDWN 14
SDO 13
V
I/P3
R
GM
IN3
10 ENB
11 SDI
ENB
SDI
PDWN
DATAOUT
SCLK
12 SCLK
Note: All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a “controlled document”. Current revisions, if any, to these
specifications are maintained at the factory and are available upon your request. We recommend checking the revision level before finalization of your design documentation.
© 2001 Elantec Semiconductor, Inc.