ISL59451 Datasheet, PDF (1/17 Pages) Intersil Corporation – Triple 4:1 DC Restored Single Supply Video Multiplexing Amplifier

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Data Sheet
September 24, 2007
ISL59451
FN6253.0
Triple 4:1 DC Restored Single Supply
Video Multiplexing Amplifier
The ISL59451 is a 4-input, single-supply triple video
multiplexer. It features a DC restore function that makes it
ideally suited for single-supply AC-coupled component video
applications where amplifier headroom is a concern.
When logic “0” is applied to CLAMP, the sample-hold
amplifier loop is closed and the DC level of the amplifier
output is set to the corresponding reference level. This can
occur during sync, or at any time that a black level is
expected. When logic “1” is applied to CLAMP, the clamp is
disabled and the correcting voltage is stored on each video
amplifier’s input coupling capacitor. This DC reference
condition is maintained during the active video period. The
restored DC voltage level can be adjusted over a range of
0V to +3V using external reference voltages applied to the
REF_G and REF_RB pins.
The device features a TTL/CMOS logic compatible gain
select pin (AV2) of x1 or x2. When HIZ is pulled high, the
outputs are put into high-impedance states and the video
inputs are disconnected. This is an essential feature for
power sensitive applications. The ISL59451 also features
channel-switching at pixel rates to allow for video overlays.
The ISL59451 operates from a single +5V supply and is
ideal for +5V systems when used with sync separators such
as the EL1883. The red and blue channels share a common
reference pin (REF_RB) which can also be used to adjust
chroma offsets in YPbPr systems. The green channel has a
separate reference pin (REF_G), which can be used to
accommodate sync-on-green or luma.
The ISL59451 is comes in a 32 Ld QFN package and is
specified for operation over the -40°C to +85°C extended
temperature range.
Ordering Information
PART NUMBER
(Note)
PART
MARKING
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL59451IRZ
ISL594 51IRZ 32 Ld 5x5 QFN L32.5x5
ISL59451IRZ-T7* ISL594 51IRZ 32 Ld 5x5 QFN L32.5x5
*Please refer to TB347 for details on reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ
special Pb-free material sets; molding compounds/die attach
materials and 100% matte tin plate PLUS ANNEAL - e3 termination
finish, which is RoHS compliant and compatible with both SnPb and
Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed
the Pb-free requirements of IPC/JEDEC J STD-020.
Features
• Complete Video Level DC Restoration System
• 250MHz Bandwidth (GAIN = 1)
• +5V Single Supply Operation
• Capable of Pixel Rate Channel Switching
• TTL/CMOS Compatible Keyed Clamp Control
• High Impedance Output Setting
• 150Ω Output Load Capability for Video Cable Driving
• Ideal for RGB/YPbPr/S-Video/Composite Video Signals
• Pb-Free (RoHS Compliant)
Applications
• SDTVs and HDTVs
• Set-Top Boxes
• Video Overlay
• Security Video
• Broadcast Video Equipment
Pinout
ISL59451
(32 LD QFN)
TOP VIEW
R1 1
B1 2
G1 3
GND 4
V+ 5
GND ₆
R2 ₇
B2 ₈
2/1
THERMAL
PAD
2/1
2/1
24 ROUT
23 ^REF_RB
22 GND
21 BOUT
20 V+
19 REF_G
18 GOUT
17 GND
Exposed Thermal Pad (Gray Area) must be
connected to GND.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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