Features: ·Generates Arbitrary Graphics Images
·15-Level Gray Scale
·8 Channels of Bit-Mapped OSD
·Loss-of-Signal Detector for All Channels
·Graphics Updatable Within the Vertical Interval
·Update Time Stamp on All Eight Channels Simultaneously
·3V and 5V Single-Supply Operation
·Works with MAX4356/MAX4358 Video Crosspoint Devices and Fast Mux Switches
·Small 100-Pin TQFP Package (200mm2)Application·Security Systems
·Video Routing
·Industrial ApplicationsSpecificationsAVDD to DVDD ..........................................................-6V to +6V
AVDD to AGND .......................................................-0.3V to +6V
AVDD to DGND .......................................................-0.3V to +6V
DVDD to AGND........................................................-0.3V to +6V
DVDD to DGND........................................................-0.3V to +6V
VH1, VK1 to DGND..................................................-0.3V to +6V
VH1, VK1 to AGND .................................................-0.3V to +6V
AGND to DGND....................................................-0.3V to +0.3V
Analog Inputs (VIDIN_) to AGND............-0.3V to (AVDD + 0.3V)
Analog Outputs (OSDFILL_) to AGND.....-0.3V to (AVDD + 0.3V)
RSET to AGND .......................................-0.3V to (AVDD + 0.3V)
Memory Interface to DGND ...................-0.3V to (DVDD + 0.3V)
Host Interface to DGND ...........................-0.3V to (VH1 + 0.3V)
OSDKEY_ to DGND.....................................-0.3V to (VK1 + 0.3V)
Continuous Power Dissipation (TA = +70°C)
100-Pin TQFP (derate 37.0mW/°C above +70°C).......2963mW
Operating Temperature Range ........................-40°C to +85°C
Storage Temperature Range .........................-60°C to +150°C
Lead Temperature (soldering, 10s) ..............................+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DescriptionThe 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 security camera surveillance systems, the MAX4455 supports the insertion of graphics and text on up to eight video output channels in 15 levels of brightness. It easily 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 supply, and a 2.7V to 5.5V analog supply. Independent interface supplies enable the MAX4455 to communicate 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 package (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).
MAX4455 Data Sheet
