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National Semicon debuts 'fastest' 16-bit AFE

Posted: 06 Nov 2006     Print Version  Bookmark and Share

Keywords:National Semiconductor  analogue front end  AFE  multi-function peripherals  MFPs 

A new three-channel, 16-bit analogue front end (AFE) from National Semiconductor Corp. improves the performance of multi-function peripherals (MFPs) targeted to small office environments, allowing colour copying speeds exceeding 40 pages per minute. 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. The LM98714 AFE enables 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 optimises system partitioning and reduces electro-magnetic interference, while enabling high-speed copying.

The 45MSPS LM98714 offers the industry's best signal-to-noise ratio 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, high-speed document scanners, facsimile equipment, and flatbed and handheld colour scanners.

The fully integrated LM98714 achieves high-speed signal throughput with a unique architecture that utilises either correlated double sampling or sample-and-hold (S/H) inputs. The AFE also has signal paths that utilise a 10-bit offset correction digital-to-analogue converter, 8-bit programmable gain amplifiers 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/transistor-transistor logic (TTL) 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 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 Rs.304.99 ($6.60) in 1,000-unit quantities.

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