Class-G headphone and Class-D speaker amplifiers balance audio power versus battery life
July 18, 2011 // Paul Buckley
Fairchild Semiconductor has developed the FAB1200 stereo Class-G ground-referenced headphone amplifier with integrated buck converter, as well as the FAB2200 audio subsystem with stereo Class-G headphone amplifier and 1.2 W Class-D mono speaker amplifier.
The FAB1200 features a charge pump that generates a negative supply voltage that allows the headphone output to be ground-centered and capacitor-free, eliminating up to two external capacitors. An integrated inductive buck regulator provides direct battery connection and adjusts the supply voltage between two different levels based on the output signal level resulting in reduced power consumption. The result of these features is reduced systems cost and extended battery runtime, while maintaining a high level of audio quality.
The device, available in a 16-bump, 0.4 mm pitch, 1.56 mm x 1.56 mm WLCSP package, offers excellent audio performance for better sounding audio headsets and is ideal for mobile handsets, tablets/MIDs, MP3 and portable media players.
The FAB2200 is an audio subsystem that combines a capacitor-free stereo Class-G headphone amplifier with a Class-D speaker amplifier. A proprietary integrated charge pump generates multiple supply rails for a ground-centred Class-G headphone output significantly reducing power dissipation when compared to Class-AB design implementations, while offering high power supply rejection ratio.
The filterless Class-D amplifier can be connected directly to a speaker without the need for two external filter networks, reducing the overall solution systems cost. The device also features Automatic Gain Control that limits the maximum speaker output levels to protect speakers without introducing distortion. It can also dynamically limit clipping as the battery voltage falls.
The FAB1200 and FAB2200 mobile audio ICs make handsets, tablets/MIDs, and other portable audio applications sound louder and better while reducing overall systems cost and minimizing the impact on battery runtime.
Samples of FAB1200 stereo Class-G ground-referenced headphone amplifier are available now. The FAB1200 is priced $0.36 in 1,000 quantity pieces.
The FAB2200, available in a 25-bump, 0.4 mm pitch, WLCSP package, is ideal for cellular handsets, notebook computers and tablets. The FAB2200 is priced $0.57 in 1,000 quantity pieces.
More information about the FAB1200 stereo Class-G ground-referenced headphone amplifier at www.fairchildsemi.com/ds/FA/FAB1200.pdf.
More information about the FAB2200 mobile audio IC at
Micrel's 10 criteria for choosing a MEMS foundry
April 18, 2014
Micrel Inc. (San Jose, Calif.) has prepared an article that lays out the 10 criteria to help guide someone in the choice ...
Superconducting qbits made immune to quasiparticle energy loss
The Filter Wizard: Just add a transistor
Mobile display revenues soar, leaving TV behind
European organic PV project aims for material gains
Nanomaterial-packed cathode extends range of EV lithium-sulfur batteries
April 17, 2014
Researchers at the USA's Department of Energy Pacific Northwest National Laboratory have developed a metal organic framework ...
Wearable computing market on 78% CAGR through 2018
OLED TV shipment delays stall OLED material growth
BMW updates navigation via mobile radio connection
- USB 5V 2.5A Output, 42V Input Synchronous Buck with Cable Drop Compensation
- Measurement applications across multiple test platforms
- Supplying DC input power to string inverters
- Supplying DC input power for HEV testing
InterviewHeartbleed challenges the Internet of Thing
The Heartbleed security bug is a key example of the fundamental security challenge for the Internet of Things says Green Hills Software as it launches a new security group.
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
This month, Arrow Electronics is giving away ten XMC1200 lighting application kits, worth 100 Euros each, for EETimes Europe's readers to win.
Each kit combines Infineon’s brightness and colour control XMC1200 CPU board to drive flicker free LED dimming and colour changing, together with a colour LED card and a white LED card.
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.