Today, the only option for high-speed color copying is a large and expensive office machine about the size of a filing cabinet. National's LM98714 AFE enables new, cost-effective architectures that achieve high copying speeds in smaller, desktop-size machines. Its feature combination lets designers place the AFE directly on the CCD board, which optimizes system partitioning and reduces electro-magnetic interference (EMI), while enabling high-speed copying.
The 45 mega-sample per second (MSPS) LM98714 offers the industry's best signal-to-noise ratio (SNR) of -74 dB and the industry's lowest power consumption of 505 mW. These high-level specifications also make the AFE well-suited for use in bank-note readers, high-speed document scanners, facsimile equipment, and flatbed and handheld color scanners.
Unique AFE Architecture Provides Breakthrough Scanning Speed
The fully integrated LM98714 achieves high-speed signal throughput with a unique architecture that utilizes either correlated double sampling (CDS) or sample-and-hold (S/H) inputs. The AFE also has signal paths that utilize a 10-bit offset correction digital-to-analog converter (DAC), 8-bit programmable gain amplifiers (PGAs) and independently controlled digital black-level correction loops for each input. The PGA and offset DAC are programmed independently, which allows unique values of gain and offset for each of the three inputs. The signals are then routed to a 45 MSPS ADC.
National offers the companion DS90CR218A Channel Link receiver for applications requiring external LVDS capability. Available in a 48-pin TSSOP package, the DS90CR218A converts the three LVDS data streams back into 21 bits of CMOS/TTL (transistor-transistor logic) data for interfacing with the image processor/ASIC. With low power and LVDS signaling, the chips work together to reduce EMI from data transfer and decrease the number of wires in the cable. More information is outlined in application note AN-1538, "Interfacing DS90CR218A to LM98714."
In addition, the LM98714 can be configured to operate in several different modes to provide maximum flexibility to designers. For compatibility with older application-specific integrated circuits (ASICs) and to simplify system debugging, the AFE also includes a CMOS output option.
Pricing and Availability
The LM98714 is available now in a 48-pin TSSOP package and priced at $6.60 in 1,000-unit quantities. For more information about the product, including how to order samples and evaluation boards, please visit http://www.national.com/pf/LM/LM98714.html .
National Semiconductor's LVDS technology is a low-power, low-noise method for high-speed data transmission over copper interconnects. LVDS solves current and future high-performance data transmission challenges in bandwidth- hungry applications by delivering data at gigabits per second at milliwatts of power. National is the world's largest supplier of high-speed LVDS products, according to Databean's 2005 Analog IC Market Share survey. National's LVDS products include interface line drivers and receivers, LVDS-LVDS signal conditioners, LVDS-LVDS switching/multiplexing/repeating functions, LVDS serializer/deserializers, FPD link display solutions and ADCs with high-speed digital interfaces. For more information on National's LVDS products, visit http://LVDS.national.com .
About National Semiconductor
National Semiconductor, the industry's premier analog company, creates high-value analog devices and subsystems. National's leading-edge products include power management circuits, display drivers, audio and operational amplifiers, interface products and data conversion solutions. National's key analog markets include wireless handsets, displays and a variety of broad electronics markets, including medical, automotive, industrial, and test and measurement applications. Headquartered in Santa Clara, Calif., National reported sales of $2.16 billion for fiscal 2006, which ended May 28, 2006. Additional company and product information is available at www.national.com.
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