SOURCE: Maxim Integrated Products

December 05, 2007 14:02 ET

Maxim Introduces Industry's First Single-Channel, On-Screen-Display (OSD) Generator With Integrated EEPROM

SUNNYVALE, CA--(Marketwire - December 5, 2007) - Maxim Integrated Products (PINKSHEETS: MXIM) introduces the MAX7456, a single-channel, monochrome on-screen-display (OSD) generator with integrated nonvolatile memory (EEPROM).

Synopsis for Investor:
--  The MAX7456 is designed for any application that needs to display
    custom text and graphics, such as logos and icons. Key examples include
    CCTV security cameras and switching systems, and automotive in-cabin
    entertainment and rear-view parking camera systems.
--  The MAX7456 simplifies design, saves board space, reduces system
    costs, and serves all national and international markets.
--  This device integrates all the functions and EEPROM needed to generate
    and insert user-defined OSD onto a composite video signal.
--  The MAX7456 also eliminates the need for an external video driver,
    sync separator, and a video switch.

The MAX7456 single-channel, monochrome on-screen-display (OSD) generator with integrated nonvolatile memory (EEPROM) fulfills the CCTV security industry's requirement to generate and overlay user-defined text and graphics onto a video image. The device integrates all the functions needed to generate and insert user-defined OSD onto a video signal, and is compatible with composite NTSC and PAL video standards.

Overcoming the Traditional OSD Design Challenge

CCTV security applications typically consist of many cameras, routed through a video switch matrix, viewed, and then recorded on a small number of monitors and recorders. Each of the various pieces of equipment in the application can contain an OSD function to display information such as date, time, camera ID, system setup, and control.

Traditionally, designers had to choose between inflexible fixed-character OSDs or expensive graphic controllers to generate and insert the OSD. Fixed-character OSDs offer only a limited selection of characters that can be displayed. Graphic controllers, moreover, are very expensive and involve complex system implementation.

"With the MAX7456 single-channel OSD generator, designers can now display information like company logo, custom graphics, time and date with increased flexibility and simpler implementation," said Jeremy Tole, Maxim's Director of Business Management for Advanced Video Products. Using the device's EEPROM, designers can insert 256 user-defined characters and graphics -- a customer request that was not possible with fixed-character OSDs. "This implementation is quite simple, and costs significantly less than a full-featured graphic controller," added Tole.

High Integration in the MAX7456

The MAX7456 integrates all the functions and EEPROM needed to generate and insert user-defined OSD onto a composite video signal. The device includes an input clamp, sync separator, video timing generator, OSD insertion MUX, nonvolatile (EEPROM) character memory, display memory, OSD generator, crystal oscillator, an SPI™-compatible interface to read/write the OSD data, and a video driver. With this high level of integration, MAX7456 simplifies the design, saves board space, and reduces system cost. In addition, the MAX7456 provides special character attributes such as blinking, inverse gray scale, and background control.

The MAX7456 accepts standard NTSC or PAL CVBS signals, which are the most commonly used video standards in the security industry. The device thus serves all U.S. and international markets.

Additional Advantages of the MAX7456

The MAX7456's EEPROM, which stores characters or graphic images, comes preloaded with 256 default characters and graphics. The EEPROM is user-programmable and provides the flexibility to load user-defined characters or graphics. A display memory stores character addresses and points to the characters stored in the EEPROM that are to be displayed. Access to all MAX7456 operations, including display memory and EEPROM, are through the SPI registers.

The MAX7456 provides vertical sync, horizontal sync, and loss-of sync outputs for system synchronization. A clock-output signal reduces system cost by allowing daisy-chaining of multiple devices using a single crystal. An internal sync generator enables the display of the OSD data even when the input video signal is absent.

The device's video-driver output has a gain of 2V/V with a 6MHz large-signal bandwidth and is capable of driving two 150 ohm video loads. Moreover, the MAX7456 has internal sag compensation that eliminates the need for large coupling capacitors while achieving acceptable line-time distortion.

Summary of MAX7456 Key Features

--  256 User-Defined Characters or Graphics in Integrated EEPROM
--  Blinking, Inverse Gray Scale, and Background-Control Character
--  Selectable Brightness by Row
--  Displays Up to 16 Rows x 30 Characters
--  Sag Compensation on Video Driver Output
--  Loss-of-Sync, Vertical Sync, Horizontal Sync, and Clock Outputs
--  Internal Sync Generator
--  NTSC and PAL Compatible
--  SPI-Compatible Serial Interface
--  Delivered with Preprogrammed Character Set

The MAX7456 saves significant board space and design time, while providing increased performance at lower cost. It operates over the -40 degrees Celsius to +85 degrees Celsius industrial temperature range, and is offered in a 28-pin TSSOP package. Prices start at $9.00 (1000-up, FOB USA). Samples and evaluation kits are available. For more information please visit:

SPI is a trademark of Motorola, Inc.

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