Synopsis for Investor:
-- These amplifiers are especially targeted for all-in-one PCs,
LCD/PDP/CRT monitors and TVs, conference phones, MP3 docking stations,
notebook PCs, and PC speakers.
-- The MAX9736A/B eliminate the need for costly and bulky LC filters,
thereby lowering EMI emissions and BOM cost.
-- To further reduce cost and save space, they eliminate a costly
regulated power supply, a heatsink, Schottky diodes, and input-filter
operation amplifiers.
-- A wide single-supply voltage range allows direct battery operation in
portable applications.
-- The high integration of the MAX9736A/B greatly reduces time to market,
space, and cost, while their broad feature set enhances versatility and
further simplifies design.
Filterless modulation keeps costs low
As IC costs continue to trend downwards, the number of external components becomes increasingly important in determining total solution cost. The MAX9736A/B feature a spread-spectrum, filterless modulation design that minimizes external components and keeps costs low. The devices pass CE EMI limits with 1m cables by using only a low-cost ferrite bead and a capacitor on each output. The MAX9736A/B do not require any external Schottky diodes, which add cost to competing solutions. The devices save further space by eliminating both output LC (inductor-capacitor) filters and input-filter operational amplifiers.
Broad feature set provides design versatility
Several integrated features make these amplifiers more versatile than competing devices.
The MAX9736A/B provide 2ohm to 8ohm (or higher) load drive capability. The MAX9736A delivers 2 x 15W into 8ohm loads, or 1 x 30W into a 4ohm load; the MAX9736B delivers 2 x 6W into 8ohm loads or 1 x 12W into a 4ohm load. With a pin-selectable stereo/mono mode, the MAX9736A/B can drive a 4ohm stereo or 2ohm mono load with supply voltages up to 12V.
The devices are pin compatible, so a single audio design will work across a broad range of platforms. Design efforts are thus simplified and PCB inventory reduced.
Available as mid- (MAX9736B) and high-power (MAX9736A) devices, the MAX9736A/B operate from a wide, single-supply 8V to 28V power supply that allows direct battery operation in portable applications. The high 67dB PSRR eliminates the need for a costly, regulated power supply. High efficiency (up to 88% at 12V supply) eliminates the need for a heatsink.
Comprehensive click-and-pop reduction circuitry eliminates noise coming into and out of shutdown or mute.
Filtering and mixing operational amplifiers are integrated. The input op amps allow the user to create summing amplifiers, lowpass or highpass filters, and select the optimal amplifier gain. For even more design flexibility, in mono mode the right input op amp is available as a spare device.
Excellent clipping recovery eliminates audible Class D overload artifacts. Thermal and short-circuit protection assures robust operation. The MAX9736A/B are fully specified over the -40 degrees Celsius to +85 degrees Celsius extended temperature range. The devices are available in a small 7mm x 7mm, 32-pin TQFN package. Prices start at $1.49 (1000-up, FOB USA). For more information, please visit: www.maxim-ic.com/Versatile-ClassD.
Maxim Integrated Products is a publicly traded company that designs, manufactures, and sells over $2 billion of high-performance semiconductor products annually. It was founded over 25 years ago with the mission to deliver innovative analog and mixed-signal engineering solutions that add value to its customers' products. To date, Maxim has developed over 5700 products serving the industrial, communications, consumer, and computing markets. For more information, go to www.maxim-ic.com.
Editors' Contact: Drew Ehrlich Business Management 408-737-7600 Readers' Contact: Customer Service 1-800-998-8800
