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| Multi-Channel RF Converter ICs Meet Wireless Carrier Needs
Analog Devices (ADI) has introduced a mixed-signal front-end (MxFE) RF data converter platform designed to meet the performance needs for a range of wireless equipment such as 4G LTE and 5G millimeter-wave (mmWave) radios. ADI's AD9081/2 MxFE platform allows system developers to install multiband radios in the same footprint as single-band radios, which as much as triples call capacity available in today's 4G LTE base stations. With a 1.2 GHz channel bandwidth, the new MxFE platform also enables wireless carriers that are adding more antennas to their cell towers to meet the higher radio density and data-rate requirements of emerging mmWave 5G. The AD9081 and AD9082 MxFE devices integrate eight and six RF data converters, respectively, which are manufactured using 28 nm CMOS process technology. Both MxFE options achieve wide instantaneous signal bandwidth (up to 2.4 GHz), which simplifies hardware design by reducing the number of frequency translation stages and relaxing filter requirements. Tiny Amplifiers Enable Small High Performance System Designs
Texas Instruments has introduced what it claims is the industry's smallest current-sense amplifier in a leaded package and the smallest, most accurate comparators with an internal 1.2 V or 0.2 V reference. The INA185 current-sense amplifier, and open-drain TLV4021 and push-pull TLV4041 comparators enable engineers to design smaller, simpler and more integrated systems while maintaining high performance. In addition, pairing the amplifier with one of the comparators produces the smallest, highest performing overcurrent detection solution in the industry, says TI. These new devices are optimized for a variety of personal electronics, enterprise, industrial and communications applications, including peripherals, docking stations and notebooks. With a small-outline transistor (SOT)-563 package measuring 1.6 mm by 1.6 mm, the amplifier is 40% smaller than the closest competitive leaded packages, says TI. Featuring a 55 µV input offset that enables higher precision measurements at low currents, the INA185 enables the use of lower-value shunt resistors to cut system power consumption. Additionally, its 350 kHz bandwidth and 2 V/µS slew rate enable phase-current reproduction to enhance motor efficiency and save system power. |
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650 W Modular Power Supplies Provide MoPP Isolation TDK has announced the introduction of the TDK-Lambda brand QM4 modular power supplies rated at 550 W to 650 W. This further extends the QM series which can provide up to 1500 W output power. The QM4 models are available with up to 10 outputs, have full MoPPs (Means of Patient Protection) isolation and low acoustic noise. With medical and industrial safety certifications, the power supplies  are suitable for use in medical, test and measurement, communications and broadcast equipment. Accepting a wide range 90 VAC to 264 VAC, 47-63 Hz input (440 Hz with reduced PFC), the QM4 can deliver 550 W at low line and 650 W with a high line 180-264 VAC input. With its modular construction, the series can be configured using a simple on-line configurator to provide 1 to 10 independently regulated outputs and include individual output good signal and remote on/off functions. The QM series module output voltages range from
2.8 V to 105.6 V and have output power levels from 300 W to 1200 W. A further subset of option modules provides an AC Fail signal, standby voltages (up to 12 V, up to 2 A), global remote on/off and PMBus communications. Overall case dimensions for the QM4 are 108 mm x 63.3 mm x 270 mm.
Win a Free Subscription to Circuit Cellar Magazine! This week's newsletter raffle is for a 1-year free subscription to Circuit Cellar! Drawing ends at midnight this coming Friday. Circuit Cellar is the premier media resource for professional engineers, academic technologists, and other electronics technology decision-makers worldwide involved in the design and development of embedded processor- and microcontroller-based systems across a broad range of applications.
And congratulations to last week's raffle winner, Edmund H., who won a 2018 archive CD of Circuit Cellar magazine. Thanks to all who participated! |
Submit Your Technical Article to Circuit Cellar Magazine
 Circuit Cellar magazine is always looking for top-notch technical articles that help readers better understand embedded electronics technology in action. Professional engineers, academics, students and serious electronics enthusiasts are encouraged to submit articles and proposals. Whether its a project-based article, an article about a technology trend, or an analysis of a technical issue or challenge, Circuit Cellar is looking for insightful, detailed articles that help its readers do their jobs as embedded system designers. If you have an article or an article proposal, let us know! Our article submissions page provides you with our requirements and guidelines. Bidirectional Current Sense Amplifier Features PWM Rejection
Maxim Integrated has introduced the MAX40056, a bidirectional current sense amplifier with patented pulse-width modulation (PWM) rejection. This high speed, wide-bandwidth amplifier extends Maxim's family of precision, high-voltage current sense amplifiers into motor control applications. Creating a motor control system requires precise current sensing and measurement of motor winding currents, says Maxim. A commonly used approach is to infer winding currents by performing ground or supply referenced measurements in the bridge circuit. Direct winding current  measurement is a simpler and more accurate method, but the implementation is challenging due to the high common mode swing of the PWM signal. Adoption of this approach has been limited by poor PWM rejection and slow settling speed of existing solutions.
MAX40056 rejects PWM slew rates of greater than
500 V/µs and settles within 500 ns to provide 0.3% accurate, full-scale winding current measurement. The patented PWM rejection scheme achieves 4 times faster settling time than competitive offerings, allowing motor control designers to increase drive frequency or decrease minimum duty cycle without sacrificing measurement accuracy. Higher PWM frequency smooths out the current flow and reduces torque ripple, resulting in more efficient motor operation. CONTINUE READING
PCB Assembly - $1000 in FREE Labor
 SlingShot is Offering Free Labor for 1st Time Customers!They are changing the game in PCB assembly. Doing the impossible, everyday. For a limited time, SlingShot Assembly is offering FREE LABOR, up to $1,000, on new customers' first turn-key order. Their 5-day turn includes parts, boards AND assembly. SlingShot Assembly challenges you to try something different.
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400 W 1/8th Brick DC-DC Converters Support PMBus
Murata has announced the introduction of its DSE Series, a fully isolated, 12 Vout, 400 W eighth brick DC-DC converter with a DOSA compliant digital interface to support the PMBus standard for communication and control. The Series, which also includes DAE and DCE products, has a droop load sharing option for paralleling up to three modules in some of the most power demanding applications. Further, the series meets the international TNV standard for Input Voltage with a 36-75 Vin range and provides 2250 VDC isolation for use in Power over Ethernet (PoE) applications.  The DSE series offers advanced power conversion technology, including a 32-bit Arm processor that controls critical conversion functions and delivers a digital interface for use in the end system application. The PMBus digital interface can be used to customize the modules' configuration for specific functions and presents system engineers with critical telemetry information. CONTINUE READING
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