
1
FN6253.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright Intersil Americas Inc. 2007. All Rights Reserved.
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ISL59451
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.
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
150
Ω 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
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
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.
THERMAL
PAD
25
24
23
22
21
20
19
32
31
30
29
28
10
11
12
13
14
1
2
3
4
5
6
7
R1
B1
G1
GND
V+
GND
R2
AV
2
ROUT
REF_RB
GND
BOUT
V+
REF_G
GND
G0
B0
R0
V+
GN
D
R3
B3
G3
S1
8
9
18
17
15
27
16
26
GOUT
GND
S0
CLAMP
B2
G2
GND
HIZ
2/1
Exposed Thermal Pad (Gray Area) must be
connected to GND.
Data Sheet
September 24, 2007
NOT RECO
MMENDE
D FOR NE
W DESIG
NS
NO RECO
MMENDE
D REPLA
CEMENT
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ur Techni
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ERSIL or
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