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
Structural electronics - the next big thing in smart cars?
September 18, 2014
Electronic circuits embedded in vehicles, aircraft and more have the potential to be a $60 billion market by 2025, says technology ...
Elastomeric camouflage switches texture and colour
Solar microinverter to break USD1bn barrier in 2018
7nm EUV could ease 10nm squeeze, says ASML
Europeans flex skills to commercialize OLED and OPV devices
Freescale opens Discovery Lab in Toulouse to foster innovation
September 17, 2014
Shortly after the company celebrated the first year of existence of its Austin-based Freescale Discovery Lab, an incubator ...
Can a large-area flexible OLED have reliable contacts?
Lemoptix pico-projector excels
Building ARM-based Bluetooth-enabled wearables
- Putting FPGAs to Work in Software Radio Systems Handbook
- Flexible and Low Power Driving of Solenoid Coils
- How to Protect & Monetize Android Apps
- Power Modules: The New Super Power
InterviewCEO interview: AMS' Laney on driving a sensor-driven business
Kirk Laney, CEO of Austrian mixed-signal chip and sensor company AMS, wants to leverage the opportunity that technology affords to create new markets for sensors and sensor interfaces.
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, Trinamic Motion Control is offering you to win one of four TMCM-1043 development kits for its highly integrated, NEMA 17-compatible TMCM-1043 stepDancer stepper motor module.
Offering designers an easy-to-use PC-based GUI that allows one-click modification of motor drive current, micro-stepping and other key parameters, the intuitive kits are custom designed and developed for...MORE INFO AND LAST MONTH' WINNERS...
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.