Product category: Analogue and Mixed Signal ICs
News Release from: Texas Instruments (April 2001-March 2006) | Subject: TPA2005D1 and TPA2004D1
Edited by the Electronicstalk Editorial Team on 1 August 2002
Low-noise amp shrinks for handset audio
A novel 1.1W mono filter-free class-D audio power amplifier from Texas Instruments combines a small package with superior noise rejection ideal for designers of GPRS and 3G cellular phones
By eliminating the output filter and improving the common-mode input range, the total solution size is 30% smaller than its siblings and surpasses all Class-D amplifiers on the market in RF noise rejection. Similar to other members in the TPA200xDx family, the TPA2005D1 and TPA2004D1 do not require an output filter and are more than 85% efficient, helping extend battery life.
This article was originally published on Electronicstalk on 1 August 2002 at 8.00am (UK)
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The solution consists of four components: the IC, two resistors and one capacitor.
A fully differential architecture provides superior noise cancellation for clean, pure audio performance.
Supporting this claim is an 85dB PSRR specification and an 80uV noise floor over the entire audio band.
Both specifications are best in industry for class-D audio power amplifiers and even surpass many class-AB amplifiers.
Complementing the outstanding audio performance and efficient operation are the low quiescent current and shutdown current.
'The TPA2005D1's combination of performance and size are a great fit in the cellular handheld market for use of voice memo playback, personalised ringers or alarms and hands-free features', said Eric Droge, product marketing manager for TI's Audio Power Amplifiers.
'A small footprint and RF immunity are characteristics an audio power amplifier needs to have success in the cellular market, and these were a priority for TI throughout the design and development process'.
To date, there are six members in the TPA200xDx family: TPA2000D1, TPA2000D2, TPA2000D4, TPA2001D1, TPA2001D2 and TPA2005D1.
Each amplifier is very efficient and operates without an output filter.
Differentiating features between the family members include, stereo headphone drive, stereo or mono speaker drive and output power.
Any heat sensitive or battery-powered applications with audio capability (eg notebook computers, PDAs, cellular phones) will benefit from using one of the TPA200xDx devices.
Devices on the roadmap will further differentiate our customer's applications by including volume control and other features soon to be announced.
The TPA2005D1 is available now from TI and its authorised distributors in a surface mount 15-ball MicroStar BGA package.
Suggested resale pricing in quantities of 1000 is $0.49.
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