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productroundup DC/DC converters surpass 2.5 kW/in3 Vicor has further increased power density, and added digital communication capability, with products added to its ChiP Bus Converter Module (BCM) product family: these ChiP-based BCMs provide power density of 2750 W/in3, supplying up to 1.75 kW with 98% peak efficiency. Vicor has also introduced digital telemetry and control capabilities for its ChiP BCM portfolio, available as an option for the new 1.75 kW modules and previously announced 1.2 kW modules. A PMBus compliant digital interface option gives system designers access to the ChiP BCM’s internal controller, enabling digital communication with an array of ChiP BCMs via a single bus for control, configuration, monitoring and other telemetry functions. The 1.75 kW modules support a nominal input voltage of 400V and nominal output voltage of 50V, with a K-factor (fixed conversion ratio) of 1/8. Complete article, here GPS modules for wearables boost location performance CSR and OriginGPS (Israel) have announced high-performance GNSS modules using CSR’s SiRFstarIV and SiRFstarV product lines. The new modules are 70% smaller than current solutions and deliver a 30% reduction in Time To First Fix (TTFF), making them suitable for health and fitness trackers, sports watches, medical devices, wearable action cameras, and digital still cameras. All modules, including the 7 x 7mm Multi Spider (ORG4572) solution, integrate the LNA , SAW filter, TCXO, RTC crystal and RF shield. The OriginGPS modules offer high sensitivity resulting in shorter autonomous and aided TTFF, better navigation stability, and higher accuracy in harsh environmental conditions. In real-life testing of the module in camera applications, TTFF performance improves by over 30% compared to other solutions. The module also delivers TTFF results in less than one minute over 90% of the time (Cold Starts). High-integration, single-phase metering SoC Maxim Integrated’s ZON M3 single-phase energy meter SoC enables ±0.1% accuracy over a 5000:1 dynamic range. Designed as a highly accurate, low-cost design system for e-meters and solid-state meters, the ZON M3 energy-meter solution integrates four 24-bit ADCs for 4-channel data collection and ±0.1% measurement accuracy over 5000:1 dynamic range. A 32-bit metrology compute engine (CE) ensures high-accuracy processing of all collected data. Its two touch-switch inputs eliminate mechanical switches, and its infrared (IR) communications interface eliminates the typical extra IR receiver module. All the high integration reduces cost and improves user experience. The device offers metering accuracy of over ±0.1% over 5000:1 dynamic range, and high integration with touch-switch inputs, IR communications and multiple interfaces (SPI, I C, and 4 USART). In a 100-pin LQFP package, the ZON M3 electricity meter costs $2.81 (1000). Complete article, here Precision battery monitor and controller Analog Devices’ AD8451 is a precision analogue front end and controller for testing and monitoring battery cells. A precision fixed gain instrumentation amplifier (IA) measures the battery charge/discharge current, and a fixed gain difference amplifier (DA) measures the battery voltage. Internal laser trimmed resistor networks set the gains for the IA and the DA, optimising the performance of the AD8451 over the rated temperature range. The IA gain is 26 and the DA gain is 0.8. Voltages at the ISET and VSET inputs set the desired constant current (CC) and constant voltage (CV) values. CC to CV switching is automatic and transparent to the system. A TTL logic level input, MODE, selects the charge or discharge mode (high for charge, low for discharge). An analogue output, VCTRL, interfaces directly with Analog Devices’ ADP1972 PWM controller. Complete article, here Complete article, here 32 EDN Europe | MAY 2014 www.edn-europe.com


EDNE MAY 2014
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