The LMV83x Series of operational amplifiers from National Semiconductor has integrated EMI filters that maintain the accuracy of analog systems by reducing the effects of RF (radio frequency) interference. They are reported to have an EMI rejection ratio (EMIRR) of 120 dB. The LMV831 single, the LMV832 dual, and the LMV834 quad op amps feature CMOS inputs, a maximum inset … [Read more...]
Online Drawing Feature Aids Purchasers of Board-Level Shields
A configurable PDF Drawing feature offered by Tech-Etch aids purchasers of both single-piece and two-piece board level shields. Users simply go to the Tech-Etch website. The first step is choosing either through-hole mounting with pins or standard surface mounting. Depending on the user’s choice, seam options and required dimensions are then filled in. Next, the metal material … [Read more...]
Aluminum SMD Capacitors Target Consumer and Industrial Applications
A new line of SMD electrolytic capacitors from EPCOS covers a capacitance range from 0.1 µF to 1500 µF and are suited for voltages from 4 VDC to 100 VDC. Versions are available for temperature ranges from -40 to +85 degrees C. Depending on the CV value, the case sizes vary between 4 mm x 5.4 mm and 10 mm x 10 mm (d x l). The B41142* series with ESR values from a minimum of 0.8 … [Read more...]
Embedded FRAM-LSI Counteracts EMI in Mobile Phones and Other Applications
The MB88R157 from Fujitsu Microelectronics Limited (FML) is an addition to its existing line of spread-spectrum clock generators used to counteract EMI on high-frequency clock signals. This device includes an embedded FRAM (ferroelectric random access memory), which features fast rewriting speed and can vary its frequency output over a range of 1 MHz to 134 MHz while mounted on … [Read more...]
Embedded FRAM-LSI Counteracts EMI in Mobile Phones and Other Applications
The MB88R157 from Fujitsu Microelectronics Limited (FML) is an addition to its existing line of spread-spectrum clock generators used to counteract EMI on high-frequency clock signals. This device includes an embedded FRAM (ferroelectric random access memory), which features fast rewriting speed and can vary its frequency output over a range of 1 MHz to 134 MHz while mounted on … [Read more...]
Film Capacitors Provide Compact Link Circuit Solution
Space-saving MKP link circuit capacitors of the DC Link HD Series (B3277) from EPCOS are now available for compact frequency converters in the power class up to about 40 kW. These high capacitance density, self-healing capacitors cover the voltage range from 450 to 1300 VDC and are available with capacitance values of between 1.5 and 110 µF. With their low ESR (3.0 mΩ) and … [Read more...]
Thin-Film Common Mode Filter Targets Use in DisplayPort
The new TCM1210U500-2P from TDK Corporation is a wideband, thin-film, common-mode filter for EMI suppression in DisplayPort interfaces. This new filter works as an EMI countermeasure on high-speed data transmission lines in notebook computers, audio-visual equipment, and other electronic devices. With dimensions of 1.2 mm (L) x 1.0 mm (W) x 0.6 mm (H), this product has been … [Read more...]
Patent Pending Spread Spectrum Clock Generator Reduces EMI
The SLG4421 from Silego Technology is a 1x multiplier spread spectrum clock generator (SSCG) featuring the industry’s widest frequency range of 24 MHz to 200 MHz, lowest current consumption and FrequencyAwareTM capability. FrequencyAwareTM is a proprietary technology pioneered by Silego that automatically determines the input frequency thus eliminating the need for input … [Read more...]
Absorber Sheets Suppress Radiated Noise
The AB-5000-S Series from 3M are thin absorber sheets of polymer resin with magnetic filler, acrylic pressure-sensitive adhesive and release liner. It has enhanced absorption at lower frequencies (below 1 GHz). Backing thickness is 1.00 mm. They are applied on a removable liner for easy handling and die-cutting. Typically used for EMI absorbing, these sheets suppress radiated … [Read more...]
Varistors and Diodes Now Provide ESD Protection in Compact Packaging
Low-capacitance CeraDiodes® and multi-layer varistors (MLV) from EPCOS now provide ESD protection in a compact 0201 package. These devices with capacitances of 22 pF are characterized by a low clamping voltage and are well suited to the protection of LED background lighting. Types with capacitances up to 10 pF are also available for USB and Ethernet systems. Because of the need … [Read more...]
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