1

®

FN6253.0

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

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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

*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.

THERMAL

PAD

24

23

22

21

20

19

1

2

3

4

5

6

7

R1

B1

G1

GND

V+

GND

R2

ROUT

REF_RB

GND

BOUT

V+

REF_G

8

18

17

GOUT

GND

B2

2/1

2/1

2/1

Exposed Thermal Pad (Gray Area) must be

connected to GND.

Data Sheet

September 24, 2007