Introduction

Highlights of this issue include new product releases from National Semiconductor, SiTime, Texas Instruments and NXP; design features on ambient-light sensors and signal integrity; analogue-related design ideas; schedule of the IEEE SOC conference and the Bluetooth Evolution conference; and research studies on industrial analog ICs.

10 september 2009

Nanopower op-amp
For its PowerWise LPV521 nanopower operational amplifier (op amp), National Semiconductor claims the lowest-available power consumption figure at 552 nanowatts (nW), with guaranteed operation down to 1.6V. Applications in which the company expects it to contribute to improved battery life include wireless remote sensors, power-line monitoring, and micropower oxygen and gas sensors.
National Semiconductor

Differential oscillator for Gigabit and 10 Gigabit Ethernet applications
SiTime has introduced the SiT9102AC differential oscillator for Gigabit and 10 Gigabit Ethernet applications. High performance networking equipment such as multi-port Ethernet Switches, FTTH (fiber to the home) equipment such as OLT (optical line terminals) and ONUs (optical network units), broadband CPE (customer premise equipment) as well as IP (Internet protocol) set top boxes can use the SiT9102AC to provide clocks for Ethernet functions.
SiTime

New Class-D amplifiers feature true filter-free operation
Texas Instruments (TI) has introduced a 15W stereo, true filter-free, analogue-input, Class-D audio amplifier. The TPA3110D2’s filter-free advanced EMI (electromagnetic interference) suppression technology eliminates the need for costly inductor-based output filters, reducing bill of materials cost.
Texas Instruments

Dual-channel Class-D amplifiers
NXP has introduced a family of dual-channel Class-D amplifiers that deliver improved sound quality and energy efficiency. The new TDF8599 Class-D amplifier family operates with maximum output power from 70 to 130W (250W mono), reducing power dissipation in the vehicle head-unit. With high dynamic audio range, the new Class-D amplifiers deliver concert hall-like sound quality.
NXP
 

Ambient-Light Sensors Pack In Features To Help Applications Get Smarter, Greener
Ambient light sensors help smart-phones conserve display power and improve battery runtime. Newer versions combine improved features, such as spectral response and dynamic range, integrated proximity, and digital communications. These features are readying the sensors for use in large-screen and automotive displays and solid-state lighting.

Signal Integrity : Equalisation magic: handle with care
In the last article I looked at pre-emphasis and, more importantly,the care needed in its application when you are implementing the new high-speed serial buses. An alternative-or addition to-preemphasisis equalisation, which is a cornerstone of LVDS (low-voltagedifferential-signal) high-speed bus systems.

Current limiter allows large USB bypass capacitance
The USB (Universal Serial Bus) specification requires a connected USB device to present a load to the host or hub of no greater than 10 µF in parallel with 44O, including the effects of any bypass capacitance visible through the device’s voltage regulator. This limit avoids excessive voltage drop at the device as inrush current charges its capacitance.

Inverting buck-boost converter regulates LED current
Controlling the brightness of LEDs requires a driver that provides a constant, regulated current. To achieve this goal, the driver topology must be able to generate a large enough output voltage to forward bias the LEDs. So, what are your choices when the input- and output-voltage ranges overlap? In one case, the converter may need to step down the input voltage, and, in another, it may need to boost up the output voltage.
 

IEEE SOC Conference 2009, 9-11 September 2009 at Northern Ireland, UK
The IEEE SOC Conference has been providing a forum for the ASIC and SoC community for sharing the latest advances in technologies and applications in that area. SOCC 2009 will offer three days of technical papers and embedded tutorials.


Bluetooth Evolution Conference, 17-18 November in London, UK
Bluetooth and Wireless Evolution Conference will examine the continued evolution of Bluetooth and other wireless connectivity technologies. The agenda will feature speeches, case studies and panel debates covering the technical and commercial impact that this evolution, and the coexistence of multiple wireless technologies in a single IC or device, will have on the marketplace.
 

2009 Industrial Analog ICs
Databeans divides industrial analog into four distinct categories: medical, test and measurement, industrial controls, and mil/aero categories, with mil/aero and process control being the most profitable groups projected for 2009. The general trend in industrial manufacturing in recent years has migrated towards increased connectivity, including Wi-Fi and other formats, reduced costs, and better power efficiency, which includes the push towards green energy.
 

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