Dual-channel Converter

Space-efficient converter reduces power usage and board area requirements

"High performance combined with low power expenditure and a small footprint are ‘must-have’ features for the most demanding applications in the medical imaging [industry],” says Kevin Kattmann, product line director for high-speed converters at Analog Devices Inc, Norwood, MA. “ For example, ultrasound equipment manufacturers are now exploring hand-carried units with wireless connectivity so they can be easily transported from department to department. Users are demanding increasingly streamlined, reliable and durable portable test instruments as more operational testing is conducted in the field.” In such high-end medical imaging applications, there has been a trend towards 12-bit analog-to-digital converters (ADCs) for systems that support channel counts as high as 128.

The company’s AD9238 dual 12-bit ADC is offered in 20, 40 and 60 MSPS (mega samples per second) with the same dynamic performance found in two single ADCs while maintaining exceptional cross-talk immunity in a single package. Since the power consumption at 3V is up to 50% less than equivalent ADCs — ranging from 180 to 600 mW over the three speed grades — it is well suited for applications that de-mand reduced power usage and board area. The 3V power supply has a separate digital output driver sup-ply to accommodate 2.5 and 3.3V logic families. The 70 dB signal-to-noise ratio provides superior image quality in imaging applications. The on-chip wideband, differential sample and hold amplifier allows for a variety of user-selectable input ranges and offsets, including single-ended configurations. It is also suitable for applications involving multiplexed systems that switch full-scale voltage levels in successive channels and for sampling inputs at frequencies up to 200 MHz.

Two single-ended independent clock inputs are available to provide system flexibility. Parallel 12-bit data outputs are provided for each channel. Also, a pin selectable mux mode allows the user to multiplex the data from both channels onto a single 12-bit out-put data bus, further reducing the number of output digital traces. A duty cycle stabilizer on the 65 MSPS model can compensate for wide variations in the clock duty cycle while allowing converters to maintain excellent dynamic performance. In combination with the company’s driver operational amplifiers, the AD9238 provides a complete solution set.

Analog Devices Inc, or go directly to their website via the Online Reader Service Program at www.rsleads.com/209md-192

Thermistors
This company has introduced a complete line of thermistors including both positive (PTC) and negative (NTC) temperature coefficients, offering a selection from interchangeable, point-matched, surface mount and thin film models to life sciences probes as small as 0.019-in. dia. Custom applications include various options in materials, configurations, leads and connections. Selco Products Co, Orange, CA.   www.rsleads.com/209df-193

Piston compressors
The 2660 series of WOB-L piston compressors have a one-piece cast aluminum head design that eliminates leakage and greatly reduces sound levels. The series is suited for medical equipment such as nebulizers, oxygen concentrators, surgical equipment and plasma separators. Maximum pressure is 160 psi, maximum vacuum is 29.2 in.Hg and maximum free flow goes to 5.6 cfm. Thomas Pumps & Compressors, Sheboygan, WI.   www.rsleads.com/209df-194

Medical coatings
BioLAST specialty medical coatings are designed to be solvent-free, environmentally friendly, and easier to use than comparable products. All coatings within the BioLAST platform can be customized to meet specific needs, such as lubricity, non-thrombogenic, antimicrobialm, anti-restinosis and anti-encrustation. There are six standard products. AST Products Inc, Billerica, MA.   www.rsleads.com/209df-195

Head space gas analyzer
Designed to measure O2 or O2CO2 in medical device packages, including those with very low headspace, CheckMate head space gas analyzers provide reliable, reproducible and fail-safe testing and documentation to eliminate operator fault caused by misreadings typically resulting from humidity, ambient air pressure or temperature. Required test sample volume is only 1 or 2 ml. PBI Dansensor, Glen Rock, NJ.   www.rsleads.com/209df-196

Wire coiling services
This company has advanced coiling machines for custom medical coiling with multi-axis controls and custom tensioning systems. Laser welding systems are capable of producing weld spot sizes as small as 0.0014-in. dia. Laser welding of exotic and precious materials and dissimilar materials, flat or shaped wire is also available. On-site EDM, laser and micro grinding provide consistent accurate end cut profiles and tolerances. Stellar Technologies, Brooklyn Center, MN.   www.rsleads.com/209df-197

Pharmaceutical grade compounds
Three additions to the Chemraz family of perfluoroelastomers — SD505, SD585 and SD605 — are pharmaceutical grade compounds for seals and components. They have been tested to comply with requirements for low contamination in the form of extractables from food contact substances as prescribed in US FDA Regulation 21 CFR 177.2600 and 1777.2400 – Total Extractables in Rubber Articles Intended for Repeated Use. Green Tweed & Co, Kulpsville, PA.   www.rsleads.com/209df-198

Piezo switches
Designed for use in harsh applications, including medical equipment, the PBA series of piezo switches is offered in NO, NC, NO (pulse) and NC (pulse), and programmable output pulse length models. They have a life expectancy in excess of 50 million cycles. The NO and NC models are rated 200 mA at 24V and have switch resistance less than 10W. LED illumination is optional. APEM Components Inc, Haverhill, MA.   www.rsleads.com/209df-199

Pumps
Designed for medical applications where an economical positive displacement pump is needed, the UGP gear pump line is compact, allows complete mounting flexibility and requires no maintenance. Standard specifications include flows up to 0.5 gpm, maximum 35 psi, weight of 8 oz, and a total length of 3.25 in. Motors for these pumps are 6, 12 and 24 VDC, 120 VAC and brushless 12 or 24 VDC. B&D Pumps Inc, Huntley, IL.   www.rsleads.com/209df-200

Power supply
The FPFM600 600W switch-mode DC power supply has an AC input of 85-264 VAC, 47-63 Hz single phase and output of 24 VDC at 25A. It has power factor correction to EN61000-3-2 Class A and EMI filtering. The unit is fully enclosed in a compact 12- x 5.5- x 3.09-in. package for OEM medical device applications. Operating temperature can be up to 60°C ambient and operating noise is less than 100 mV. Condor Inc, Oxnard, CA.   www.rsleads.com/209df-201

Medical adapter
Providing a reliable adapter with low leakage current, the PSS22U adapter switching power supply has a leakage current of less than 0.1 mA at 264 VAC. The adapter delivers up to 24W of power with many standard models with output voltages from 3.3 to 24V. The adapter measures 4.3 x 2.28- x 1.27-in. and weighs just over 7 oz. The unit is designed for use in blood/fluid analyzers and non-patient contact instruments. Phihong, Fremont, CA.   www.rsleads.com/209df-202

Inert solenoid valve
Model PKV-2R molded inert isolation valves are molded of PPS and feature a PTFE isolation diaphragm and FPM valve seat seal. The two-way, solenoid-operated valves have a 6 mm orifice size and are well suited for controlling waste fluid lines on automated chemistry systems such as analytical, clinical and biotechnology analyzers. The valves measure 71 x 43 mm and are rated for 12 or 24 VDC. Clark Solutions, Hudson, MA.   www.rsleads.com/209df-203

Inert connectors
These inert color-coded PTFE connectors have zero dead volume and are available in bore sizes of 0.03-, 0.06- and 0.19-in. Tubing sizes between 0.04- and 0.43-in. can be connected using either O-rings or PTFE cones, and adapters are available to allow connections directly to luer fittings and flexible tubing. Applications include sampling, stream splitting, mixing and fluid line connection. Omnifit, Rockville Centre, NY.   www.rsleads.com/209df-204

Miniature latching solenoid
The Model SC0323L pull-type magnetic latching solenoid features a zero-power-to-hold mechanism for continual hold in the absence of electrical power. It is rated at a maximum force of 4.5 oz at a 0.05-in. stroke (10% duty cycle). Power requirements are 0.45 W-sec for operation and 0.30 W-sec for reset. Life expectancy is in the multi-millions of cycles. Bicron Electronics Co, Canaan, CT.   www.rsleads.com/209df-205

Custom lighting
Designed for medical OEM products, this series of custom modular lighting designs and configurations features a halogen lamp for long-lasting intensity and near-daylight color rendition. Many wattages and styles are offered, including gooseneck and articulating arm models. PUR scratch resistant sleeving is optional, and a Quick Detach model is available for temporary illumination. Sunnex Inc, Natick, MA.   www.rsleads.com/209df-206

Medical grade TPE
Dynaflex G2706 TPE compound has been approved for USP XIX class VI certification and is compliant with FDA CFR 177.1210 regulations. Given its elastomeric properties and soft durometer (Shore A 29), this grade is well-suited as an alternative to latex or other allergenic thermoset rubbers. The recyclable material has excellent colorability and exhibits good adhesion when overmolded onto polypropylene. GLS Corp, McHenry, IL.   www.rsleads.com/209df-207

Intricate metal-forming
This company provides complex metal-formed components for applications requiring fast start-up, high accuracy and controlled costs. This 6061-T6 aluminum kidney dialysis tray is typical. It is manufactured using three hydroforming processes developed particularly for this product. Conventional milling and assembly operations plus heat treatment for strength complete the process. . Bomco Inc, Gloucester, MA.   www.rsleads.com/209df-208

Ultraminiature power supplies
Designed to meet space and performance needs in medical and dental instrumentation, the OFM/M series of medically-approved ultraminiature open frame modular switching power supplies provides output over the range of 5 to 15 W. All models accept universal input from 85 to 265 VAC and 47 to 440 Hz. Single outputs range from 3.3 to 24 VDC and dual outputs of ±12 or ±15 VDC. Astrodyne, Taunton, MA.   www.rsleads.com/209df-209