Semiconductor Corp.'s stereo analog
with integrated Class G headphone amplifier and automatic level control (ALC)
is for smartphones and feature phones. The PowerWise LM49251's Class G
headphone amp reduces the supply voltage to lower power consumption and extend
audio (MP3, movies, etc.) playback time. The loudspeaker's ALC provides
designers with options to control audio distortion levels and prevent speaker
National's LM49251stereo analog subsystem combines a 1.4W Class
D speaker amplifier, 20 mW Class G headphone amplifier and ALC in a 2.55 by
3.02 mm package. The LM49251 offers low power consumption, consuming less than
7 mA of quiescent current at 3.3V for the loudspeaker and headphone. The
LM49251's ALC feature provides designers with a programmable output power
limiter for speaker protection and clip level select.
Offered in a 30-bump micro SMD package, the LM49251 provides enhanced Emission Suppression
(E2S) and a Class D amplifier featuring a patented, ultra-low EMI pulse-width
modulation (PWM) architecture that significantly reduces RF emissions while
preserving audio quality. The LM49251's Class G headphone architecture
significantly increases audio playback time with its adaptive power supply
approach, enabling low supply rails.
no-clip ALC feature prevents distortion as battery voltages drop, allowing
small signals to be amplified at high gains while preventing clipping of
high-level signals. Its multiple inputs provide configurability for addressing
different system requirements, and the LM49251's mode selection, shutdown and
volume are controlled through an I2C compatible interface. The IC's
click-and-pop suppression eliminates audible transients on power up and during
introduced the LM49153 mono audio subsystem,
which includes the same features as the LM49251, while integrating noise gate
functionality onto the Class D amplifier. The noise gate feature prevents noise
from being amplified when the volume is turned up. The LM49153 is offered in a
25-bump, 2.30 by 2.42 mm, micro SMD package.
United Launch Alliance will fly 3D-printed flight hardeware parts on its rockets starting next year with the Atlas V. The company's Vulcan next-gen launch vehicle will have more than 100 production parts made with 3D printing. The main driver? Parts consolidation and 57% lower production costs.
The new small-form-factor EZ-BLE PRoC (Programmable Radio on Chip) module is a derivative of the existing PRoC BLE Programmable Radio-on-Chip solution. The EZ-BLE PRoC module integrates the programmability and ARM Cortex-M0 core of the PRoC BLE, two crystals, an onboard chip antenna, a metal shield, and passive components.
The engineers and inventors of the post WWII period turned their attention to advancements in electronics, communication, and entertainment. Breakthrough inventions range from LEGOs and computer gaming to the integrated circuit and Ethernet -- a range of advancements that have little in common except they changed our lives.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.