Product category: Analogue and Mixed Signal ICs
News Release from: National Semiconductor | Subject: LM98714
Edited by the Electronicstalk Editorial Team on 06 November 2006
Analogue IC upgrades multifunction
peripherals
Three-channel 16bit analogue front end improves the performance of multifunction peripherals for small office environments.
A new three-channel, 16bit analogue front end (AFE) from National Semiconductor Corp dramatically improves the performance of multifunction peripherals (MFPs) targeted to small office environments, allowing colour-copying speeds exceeding 40 pages per minute It also allows for performance improvements in machine vision cameras, bank note scanners, earth observation satellites and any other applications using linescan image sensors where both scanning speed and resolution matter
This article was originally published on Electronicstalk on 5 Jan 2001 at 8.00am (UK)
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Operating up to 45MHz, the LM98714 is the first AFE to integrate a programmable timing generator for charge-coupled devices (CCD) or contact image sensors (CIS) as well as serial low-voltage differential signalling (LVDS) outputs.
Today, the only option for high-speed colour 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.
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Its feature combination lets designers place the AFE directly on the CCD board, which optimises system partitioning and reduces electro-magnetic interference (EMI), while enabling high-speed copying.
The 45Msample/s LM98714 offers the industry's best signal-to-noise ratio (SNR) of -74dB and the industry's lowest power consumption of 505mW.
These high-level specifications also make the AFE well-suited for use in bank-note readers, linescan machine vision cameras, push-broom type earth observation satellites, high-speed document scanners, facsimile equipment, and flatbed and handheld colour scanners.
The fully integrated LM98714 achieves high-speed signal throughout with a unique architecture that utilises either correlated double sampling (CDS) or sample-and-hold (S/H) inputs.
The AFE also has signal paths that utilise a 10bit offset correction digital-to-analogue convertor (DAC), 8bit 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 45Msample/s 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 21bit of CMOS/TTL (transistor-transistor logic) data for interfacing with the image processor/ASIC.
With low power and LVDS signalling, the chips work together to reduce EMI from data transfer and decrease the number of wires in the cable.
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.
The LM98714 is available now in a 48-pin TSSOP package and priced at $6.50 in 1000-unit quantities.
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