MAX4455 Datasheet, PDF (1/30 Pages) Maxim Integrated Products – Arbitrary Graphics On-Screen Display Video Generator

19-2463; Rev 2; 3/03
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Arbitrary Graphics On-Screen Display
Video Generator
General Description
The MAX4455 is an eight-channel arbitrary graphics
on-screen display (OSD) video generator that inserts
arbitrary gray-scale bit-mapped graphics into eight
asynchronous composite video sources. Ideal for secu-
rity camera surveillance systems, the MAX4455 sup-
ports the insertion of graphics and text on up to eight
video output channels in 15 levels of brightness. It easi-
ly displays information such as company logo, camera
location, time, and date with arbitrary fonts and sizes.
Arbitrary graphics capability enables the display of
unique languages and fonts, allowing manufacturers to
tailor their system for any geographic market. The
MAX4455 is designed to work with Maxim’s video
crosspoint switches, such as the MAX4356 and
MAX4358, which include circuitry that simplifies the
insertion of the OSD information. The MAX4455 can
also be used with discrete fast mux switches.
The MAX4455 operates from a 3V to 3.6V digital sup-
ply, and a 2.7V to 5.5V analog supply. Independent
interface supplies enable the MAX4455 to communi-
cate with microprocessors and OSD crosspoint switch
logic with logic levels ranging from 2.7V to 5.5V. The
MAX4455 uses an external 16Mb SDRAM for graphical
image storage for all eight video channels. The
MAX4455 manages all memory interface functions,
allowing a simple host µP interface. The MAX4455’s
multiple-channel memory sharing and multiple-location
write function allow fast memory updates of shared
graphics information necessary for rapidly changing
OSD information, such as a time stamp.
The MAX4455 is available in a thin 100-pin TQFP pack-
age (200mm² area), and is fully specified over the
extended temperature range (-40°C to +85°C). The
MAX4455EVSYS is available to evaluate the MAX4455
along with the MAX4358 (32 × 16 video crosspoint
switch with OSD).
Applications
Security Systems
Video Routing
Industrial Applications
Pin Configuration appears at end of data sheet.
Features
o Generates Arbitrary Graphics Images
o 15-Level Gray Scale
o 8 Channels of Bit-Mapped OSD
o Loss-of-Signal Detector for All Channels
o Graphics Updatable Within the Vertical Interval
o Update Time Stamp on All Eight Channels
Simultaneously
o 3V and 5V Single-Supply Operation
o Works with MAX4356/MAX4358 Video Crosspoint
Devices and Fast Mux Switches
o Small 100-Pin TQFP Package (200mm²)
PART
MAX4455ECQ
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
100 TQFP
Functional Diagram
VIDIN0
VIDEO TIMING
EXTRACTION
DVDD
AVDD
DGND
AGND
DIGITAL LINE
BUFFERS
MAX4455
4-BIT D/A
OSDFILL0
VIDIN1
VIDEO TIMING
EXTRACTION
DIGITAL LINE
BUFFERS
4-BIT D/A
OSDFILL1
VIDIN2
VIDIN7
RDY/BSY
AD7–AD0
8
ADDR/DATA
RD
WR
CS
VIDEO TIMING
EXTRACTION
DIGITAL LINE
BUFFERS
VIDEO TIMING
EXTRACTION
DIGITAL LINE
BUFFERS
CPU
INTERFACE
MEMORY
INTERFACE
11
16
VH1 DQ RAS CAS WE BA CK
MEMORY MEMORY
ADDRESS DATA
BUS BUS
4-BIT D/A
DAC
CURRENT
REF
4 BIT D/A
OSDFILL2
RSET
OSDFILL7
OSD
CONTROL
AND TIMING
OSDKEY0
OSDKEY1
OSDKEY2
OSDKEY7
VK1 XTAL2 XTAL1/SYNC
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.