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MAX9770 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX9770 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 24 page General Description The MAX9770 combines a mono, filterless, Class D speaker amplifier and stereo DirectDrive headphone amplifiers in a single device. The MAX9770 operates from a single 2.5V to 5.5V supply and includes features that reduce external component count, system cost, board space, and offer improved audio reproduction. The speaker amplifier makes use of Maxim’s patented Class D architecture, providing Class AB performance with Class D efficiency, conserving board space, and extending battery life. The speaker amplifier delivers 1.2W into an 8 Ω load while offering efficiencies above 85%. A spread-spectrum scheme reduces radiated emissions caused by the modulation frequency. Furthermore, the MAX9770 oscillator can be synchro- nized to an external clock through the SYNC input, avoiding possible problem frequencies inside a system. The speaker amplifier features a low 0.025% THD+N, high 70dB PSRR, and SNR in excess of 90dB. The headphone amplifiers feature Maxim’s patented DirectDrive architecture that produces a ground-refer- enced output from a single supply, eliminating the need for large DC-blocking capacitors. The headphone ampli- fiers deliver up to 80mW into a 16 Ω load, feature low 0.015% THD+N, high 80dB PSRR, and ±8kV ESD-pro- tected outputs. A headphone sense input detects the presence of a headphone, and automatically configures the amplifiers for either speaker or headphone mode. The MAX9770 includes internally set, logic-selectable gain, and a comprehensive input multiplexer/mixer, allow- ing multiple audio sources to be selected and for true mono reproduction of a stereo source in speaker mode. Industry-leading click-and-pop suppression eliminates audible transients during power and shutdown cycles. A low-power shutdown mode decreases supply current consumption to 0.1µA, further extending battery life. The MAX9770 is offered in space-saving, thermally effi- cient 28-pin TQFN (5mm x 5mm x 0.8mm) and 28-pin TSSOP packages. The MAX9770 features thermal-over- load and output short-circuit protection, and is specified over the extended -40°C to +85°C temperature range. Applications Cellular Phones PDAs Compact Notebooks Features ♦ 1.2W Filterless Class D Amplifier Passes FCC Class B Radiated Emissions Standards with 100mm of Cable ♦ Unique Spread-Spectrum Mode Offers 5dB Emissions Improvement Over Conventional Methods ♦ 80mW DirectDrive Headphone Amplifier Eliminates Bulky DC-Blocking Capacitors ♦ High 80dB PSRR at 217Hz ♦ 85% Efficiency ♦ Low 0.015% THD+N ♦ Industry-Leading Click-and-Pop Suppression ♦ Integrated 3-Way Input Mixer/Multiplexer ♦ Logic-Selectable Gain ♦ Short-Circuit and Thermal Protection ♦ ±8kV ESD-Protected Headphone Outputs ♦ Low-Power Shutdown Mode ♦ Available in Space-Saving, Thermally Efficient Packages 28-Pin TQFN (5mm x 5mm x 0.8mm) 28-Pin TSSOP 1.2W Low-EMI, Filterless, Mono Class D Amplifier with Stereo DirectDrive Headphone Amplifiers ________________________________________________________________ Maxim Integrated Products 1 SPKR (MONO) MAX9770 CLASS D VDD DirectDrive STEREO HEADPHONE L1IN L2IN R1IN R2IN MONO GAIN SEL INPUT SEL MUTE SHDN HPS PART TEMP RANGE PIN-PACKAGE MAX9770ETI † -40 oC to +85oC 28 TQFN-EP* MAX9770EUI -40 oC to +85oC 28 TSSOP Ordering Information Simplified Block Diagram 19-3134; Rev 0; 5/04 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Pin Configuration appears at end of data sheet. †Lead-free package. *EP = Exposed paddle. |
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