Roemtech, LLC
Lewisville, TX 75057
Nov 09, 2009 Compact, 18 V, 45 W, plenum rated amplifier/mixer, model PlenumAmp PMA-245 accepts both RCA and 3.5 mm stereo inputs. With independent mixer volume controls for each source, unit is designed for use with data projectors. Built-in noise filtration circuitry ensures clear audio performance. Measuring 5.43 x 1.65 x 4.80 in., chassis features heat-sink to dissipate heat effectively.

Maxim Integrated Products
Sunnyvale, CA 94086
Nov 06, 2009 Supplied in 2.5 x 3 mm UCSP(TM), MAX9879 combines stereo Class D speaker amp, DirectDrive® stereo headphone amp, and analog bypass switch. Class D amplifier technologies provide Class AB audio performance with Class D efficiency. Able to deliver 715 mW output power from 3.7 V supply into 8 ohm load with 88% max efficiency, product also features input mixing, volume control, click-and-pop suppression, and flexible, user-defined input architecture with preamplifier gain settings.

Bruel & Kjaer
Norcross, GA 30071
Oct 30, 2009 Class D amplifier, Model 2734-B weighs less than 7 kg and has high power output to deliver up to 500 W to associated sound source. Built-in pink and white noise generator can be controlled manually or by wireless remote control option for Type 2250, 2270 and 2260 hand-held analysers. Calibrated controls and level indicator lamps aid in restoring settings, while indicator lamps also serve to protect sound source from excessive signal levels.

STMicroelectronics
GENEVA   Switzerland
Oct 15, 2009 Supplied in 5 x 5 mm lead-free QFN32 package, TS4982 integrates adjustable 3D sound enhancement circuitry that allows closely spaced speakers to deliver greater stereo spatial effects. Other IC elements include 2 x 2 W stereo speaker driver, 125 mW stereo headphone driver, 4-step digital volume control, pop-and-click reduction circuitry, and PC-beep pass-through capability. Device draws 10 nA in shutdown mode, promoting runtime in battery-powered devices.

Audium Semiconductor Ltd
Bristol   United Kingdom
Oct 09, 2009 Housed in single 64QFN package and operating directly from 0.8-1.8 V supply, Model AS1001 enables battery-powered amplified speakers to run 3 hours per day for 10 months. IC uses patented techniques to minimize both fixed power losses and output-dependent variable power losses. With power rail switching, amplifier operates efficiently from low voltage rail, with DC-DC boost converter driving higher voltage transistors on extreme audio peaks.

Analog Devices, Inc.
Norwood, MA 02062-9106
Oct 02, 2009 Suited for handset and portable device manufacturers, SSM2517 Class D amplifier combines audio DAC, power amp, and PDM (pulse density modulation) digital interface in one 1.5 x 1.5 mm, 9-ball WLCSP. Effect of GSM interference or other sources of electrically coupled noise are minimized, because audio is transmitted digitally to product. Package size and filterless design minimize board space requirements, and nominal power efficiency is rated at 90%.

Texas Instruments, Inc. (TI)
Dallas, TX 75243-4136
Sep 21, 2009 Housed in SO-8 package, Model OPA1612 achieves 1.1 nV √Hz noise density with ultra-low distortion of 0.000015% at 1 kHz. Rail-to-rail output swing to within 600 mV with 2 W load maximizes dynamic range. Featuring wide supply range of ±2.25 to ±18 V from 3.6 mA of supply current per channel, dual-channel, bipolar-input op amp is suited for professional audio and broadcast studio equipment, microphone pre-amplifiers, and A/V receivers.

STMicroelectronics
GENEVA   Switzerland
Sep 16, 2009 As 50 W + 50 W stereo class-D amplifier IC, TDA7492 uses sixth-generation BCD6S (Bipolar/CMOS/DMOS) process that allows analog, logic, and high-voltage functions on one chip. BCD6S process promotes efficiency while simultaneously reducing crosstalk and also enables complementary NMOS and PMOS transistors in high-power output circuitry. Along with THD+N below 0.01%, features include built-in output filtering, integrated standby and mute functions, as well as external synchronization.

Intersil Corporation
Milpitas, CA 95035
Sep 11, 2009 Model ISL99201 is mono Class D amplifier that delivers up to 2.5 W into 4 W load and operates with 86% efficiency at 400 mW into 8 W, with signal-to-noise ratio better than 95 dB. Featuring operating voltage of 2.4-5.5 V, ISL99202 stereo cap-free headphone amplifier supports 16-600 W speaker impedance and prevents bursts at 217 Hz from interfering with audio output. Both offer click-and-pop suppression as well as undervoltage/short circuit protection.

Texas Instruments, Inc. (TI)
Dallas, TX 75243-4136
Sep 11, 2009 Supplied in 28-pin TSSOP, TPA3110D2 is 15 W stereo, true filter-free, analog-input, Class-D audio amplifier with integrated EMI suppression technology that eliminates need for inductor-based output filters. SpeakerGuard(TM) protection circuitry prevents speakers from being overdriven or damaged by DC currents, while THD+N performance of less than 0.1% over full power range at 1 kHz and click-and-pop suppression circuitry lend to optimal audio performance and fidelity.

Atmel Corp.
San Jose, CA 95131
May 29, 2009 Supplied in 5 x 5 mm, 32-pin QFN package, AT73C240 integrates 20-bit stereo DAC with 90 dB dynamic range and 1 W (max) audio power amp. Stereo DAC comprises multi-bit sigma-delta modulator with dither, continuous time analog filters, and analog output drive circuitry. Master clock is 256 or 384 times sampling frequency, allowing choice of input data rate up to 50 kHz. Also, stereo 32 ohm headset drivers include programmable volume control, mute function, and mixer for stereo inputs.

Advanced Analogic Technologies Inc.
Sunnyvale, CA 94085
May 12, 2009 Model AAT5101 2.5 W Class D audio amplifier operates from 2.1-5.5 V supply voltage and delivers up to 92% efficiency and offers 0.06 µA shutdown current and 1.35 mA quiescent current. It features low noise, filterless PWM architecture and outputs 1.35 W with 8 W load and THD+N of less than 1% and 2.5 W with 4 W load and THD+N below 10%. Operating across -40 to +85°C temperature range, it features thermal and short circuit protection circuitry with self-recovery.

International Rectifier Corp.
El Segundo, CA 90245
Apr 29, 2009 Based upon half bridge topology, 200 V Model IRS2093 integrates 4-channels of Class D audio amplifier drivers, error amplifier, gate driver, and 800 kHz analog PWM modulator in single IC. Device includes programmable bidirectional over-current protection with self-reset control, under-voltage lockout protection, and programmable preset deadtime. Housed in MLPQ48 package, IC is suited for home theater systems and car audio amplifiers.

National Semiconductor Corp.
Santa Clara, CA 95051-0695
Apr 20, 2009 Housed in 1.7 x 1.7 x 0.4 mm-pitch micro SMD package, PowerWise® LM48824 Class G Amplifier draws 0.9 mA quiescent current to double audio playback time of smart phones, mobile phones, and portable music players. Unit includes 32-step I2C compatible volume control with mute and delivers 37 mW/channel into 16 W load with less than 1% THD+N at 3.6 V. High PSRR of 105 dB at 217 Hz enables device to operate in noisy environments without additional power supply conditioning.

National Semiconductor Corp.
Santa Clara, CA 95051-0695
Apr 16, 2009 Mixed-signal audio subsystem (LM49352) integrates audio codec functionality with ground-referenced headphone amps, earpiece driver, Class D loudspeaker, and audio DSP in 3.3 x 3.3 mm package. Analog subsystem (LM49151) integrates earpiece driver, Class D loudspeaker, ground-referenced headphone amps, and automatic level control (ALC) in 2.2 x 2.6 mm package. Applications include smart phones, full-featured phones, portable gaming devices, and portable GPS devices.

Texas Instruments, Inc. (TI)
Dallas, TX 75243-4136
Mar 25, 2009 Models TAS5709 and TAS5710 digital-input amplifiers combine 32-bit audio processing with 20 W stereo output power. Units include speaker equalization, with up to 9 biquad filters/channel, and store up to 3 sets of biquad coefficients to optimize performance. Dual-band dynamic range control with selectable threshold, attack, and decay protects speakers from damage and stops bass rattling of cabinet/enclosure. Also, 2-channel I2S input allows direct connection to digital processor.

STMicroelectronics
GENEVA   Switzerland
Mar 12, 2009 Model TS4999, 2-channel class D stereo audio amplifier IC features 3D audio that creates effect of wide channel separation. Selectable 3D modes allow audio image to be focused behind, above, or below listener. Unit delivers up to 2.8 W/channel into 4 W speaker loads and achieves distortion of 1%, with high power-supply rejection ratio preventing supply noise from entering audio signal. It has 10 nA power-saving mode minimizing battery drain when audio features are not in use.

Maxim Integrated Products
Sunnyvale, CA 94086
Feb 23, 2009 Suited for space-constrained applications, MAX9791/MAX9792 audio-subsystem ICs combine 2 W stereo or 3 W mono Class D speaker amplifier, stereo DirectDrive® headphone amplifier, and one 120 mA low-dropout (LDO) regulator in single 4 x 4 mm chip. Low-EMI design reduces interference with radios found in notebook PCs, while low RF susceptibility ensures operation in close proximity to wireless applications. Devices are specified over -40 to +85°C extended temperature range.

Renesas Technology America, Inc.
San Jose, CA 95134-1368
Jan 26, 2009 Featuring built-in 24-bit audio DSP, R2J15116FP delivers stereo output to 2 speakers at up to 15 W/channel, and is intended for use in thin flat-screen TVs employing LCD or plasma display panels. It features compact package measuring 7 x 7 mm, uses feedback circuit to stabilize output level during voltage fluctuations, while it's DSP also performs processing for volume control and parametric equalizer. Product also features overcurrent, overheating, and low voltage protection.

STMicroelectronics
Carrollton, TX 75006
Jan 15, 2009 Sound Terminal(TM) model STA339BWS utilizes techniques such as Full Flexible Amplification (FFX) to enable fully digital stream from sound source to loudspeaker, promoting audio performance and reducing size for home-audio equipment using small speakers, such as flat-panel TVs and docking stations. Solution combines IP from audio processing and class-D power amp ICs into one chip and includes features such as MultiBand Dynamic Range Compression and 7-band equalizer.