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廬

ISL59451

Data Sheet

September 24, 2007

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 鈥?鈥?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 鈥?鈥?is applied to CLAMP, the clamp is

disabled and the correcting voltage is stored on each video

amplifier鈥檚 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擄C to +85擄C extended

temperature range.

Features

鈥?Complete Video Level DC Restoration System

鈥?250MHz Bandwidth (GAIN = 1)

鈥?+5V Single Supply Operation

鈥?Capable of Pixel Rate Channel Switching

鈥?TTL/CMOS Compatible Keyed Clamp Control

鈥?High Impedance Output Setting

鈥?150惟 Output Load Capability for Video Cable Driving

鈥?Ideal for RGB/YPbPr/S-Video/Composite Video Signals

鈥?Pb-Free (RoHS Compliant)

Applications

鈥?SDTVs and HDTVs

鈥?Set-Top Boxes

鈥?Video Overlay

鈥?Security Video

鈥?Broadcast Video Equipment

Pinout

ISL59451

(32 LD QFN)

TOP VIEW

32 GND

27 GND

25 AV2

24 ROUT

23 REF_RB

2/1

R1 1

B1 2

G1 3

THERMAL

PAD

2/1

26 HIZ

28 V+

31 G0

30 B0

29 R0

22 GND

21 BOUT

20 V+

Ordering Information

PART NUMBER

(Note)

ISL59451IRZ

ISL59451IRZ-T7*

PART

MARKING

PACKAGE

(Pb-Free)

PKG.

DWG. #

L32.5x5

L32.5x5

GND 4

V+ 5

2/1

ISL594 51IRZ 32 Ld 5x5 QFN

ISL594 51IRZ 32 Ld 5x5 QFN

GND 6

R2 7

B2 8

GND 10

R3 11

B3 12

G3 13

S1 14

S0 15

CLAMP 16

G2 9

19 REF_G

18 GOUT

17 GND

*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.

Exposed Thermal Pad (Gray Area) must be

connected to GND.

1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774

|

Intersil (and design) is a registered trademark of Intersil Americas Inc.

Copyright 漏 Intersil Americas Inc. 2007. All Rights Reserved.

All other trademarks mentioned are the property of their respective owners.

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