Product category:
Analogue and Mixed Signal ICs
News Release from: Analog Devices | Subject: SSM2301 and SSM2304
Edited by the Electronicstalk Editorial
Team on 11 August 2006
Amplifiers integrate click-and-pop
suppression
Class-D audio amplifiers meet the low-power, small size and growing sound quality requirements of portable electronics.
Analog Devices has introduced two Class-D audio amplifiers designed to meet the low-power, small size and growing sound quality requirements of portable electronics A leader in delivering innovative sound processing solutions for home and professional applications, ADI is applying its expertise to Class-D amplifiers that address the space constraints and battery-consumption requirements of cellular handsets, handheld game machines, MP3 players, laptop computers, and handheld media devices
This article was originally published on Electronicstalk on 14 Sep 2001 at 8.00am (UK)
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ADI's SSM2301 and SSM2304 Class D amplifiers are designed to efficiently drive speakers in handheld and portable consumer applications by consuming minimal power, employing sigma-delta modulation to reduce electromagnetic interference (EMI) emissions, and integrating a filterless topology that eliminates external components.
"Combining the power-saving and space-saving benefits of Class-D audio technology with ADI's linear IC expertise has enabled a portfolio of audio amplifiers that deliver exceptional sound for a range of applications - from portable devices such as cellular handsets and MP3 players, to thin flat panel advanced televisions and multichannel surround-sound car stereos", said Steve Sockolov, Product Line Director, Precision Signal Processing.
"While most Class-D amplifiers use some variation of pulsewidth modulation (PWM), ADI's Class-D amplifiers use a sigma-delta pulse density modulation (PDM) to reduce the amplitude of spectral components at high-frequencies, thus significantly minimising EMI emissions".
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The SSM2301 (mono) and SSM2304 (stereo) devices operate at a very high 85% efficiency over a wide range of output power levels.
The SSM2301 delivers 1.4W into an 8ohm load, and the SSM2304 delivers 2W of power into a 4ohm load.
Both devices operate on a single 2.5 to 5.5V supply, have a micro-shutdown mode with a maximum shutdown current of 20nA, and feature a built-in thermal shutdown and output short circuit protection.
The ability to function at very low voltages makes them ideal for applications, such as cellular handsets, where the speaker amplifiers are driven directly from the battery voltage.
The new Class-D audio amplifiers are housed in tiny 8-lead, 3 x 3mm lead-frame chip-scale packaging (LFCSP).
Board space is further conserved with a filterless topology that eliminates external output filters.
The SSM2301 and SSM2304 have less than 1% total harmonic distortion plus noise (THD+N) when driving peak output loads from a 5V supply, and a signal-to-noise ratio (SNR) that is better than 98dB.
The fully differential input provides excellent rejection of common-mode noise on the input.
The amplifiers also include click-and-pop suppression circuitry that reduces audible noise on activation and deactivation - and feature flexible fixed and user-adjustable gain configurations.
The SSM2301 and SSM2304 are the most recent additions to ADI's portfolio of Class-D amplifiers, which also includes the AD199x family of audio power amplifiers.
The SSM2301 and SSM2304 Class-D audio amplifiers are sampling now, with production quantities available in August 2006, and are priced at $0.55 per unit in 1000-piece quantities.
The devices are fully specified over the industrial temperature range of -40 to +85C.
An evaluation board with additional measurement filters is also available.
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