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AS1702 Datasheet(PDF) 1 Page - ams AG |
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AS1702 Datasheet(HTML) 1 Page - ams AG |
1 / 13 page AS1702, AS1703, AS1704, AS1705 1.6W Single-Channel Audio Power Amplifiers austriamicrosystems Dat a Sh eet www.austriamicrosystems.com Revision 1.01 1 - 13 1 General Description The AS1702, AS1703, AS1704, and AS1705 are single- channel differential audio power-amplifiers designed to drive 4 and 8 Ω loads. The integrated gain circuitry of these amplifiers and their small size make them ideal for 2.7- to 5V-powered portable audio devices. The differential input design improves noise rejection and provides common-mode rejection. A bridge-tied load (BTL) design minimizes external component count, while providing Hi-Fi audio power amplification. The devices deliver 1.6W continuous average power per channel to a 4 Ω load with less than 1% total harmonic distortion (plus noise), while operating from a single 2.7 to 5V supply. In order to facilitate reduced component designs, the devices are available with different gain levels: ! AS1702 – Adjustable Gain (via external components) ! AS1703 – AV = 0dB ! AS1704 – AV = 3dB ! AS1705 – AV = 6dB Integrated shutdown circuitry disables the bias genera- tor and amplifiers, and reduces quiescent current con- sumption to less than 100nA. The shutdown input can be set as active-high or active-low. All devices contain comprehensive click-and-pop suppression circuitry that reduces audible clicks and pops during power-up and shutdown. The AS1702, AS1703, AS1704, and AS1705 are pin compatible with the LM4895 and the MAX9718A/B/C/D. The devices are available in a 10-pin MSOP package. Figure 1. Simplified Block Diagram 2 Key Features ! 2.7 to 5.5V (VCC) Single-Supply Operation ! THD+N: 1.6W into 4 Ω at 1% (per Channel) ! Differential Input ! Adjustable Gain Option (AS1702) ! Internal Fixed Gain to Reduce External Component Count (AS1703, AS1704, AS1705) ! <100nA Low-Power Shutdown Mode ! Click and Pop Suppression ! Pin-Compatible National Semiconductor LM4895 (AS1705) and Maxim MAX9718A/B/C/D ! Operating Temperature Range: -40 to +85°C ! Low-Cost MSOP-10 Package 3 Applications The devices are ideal as audio front-ends for battery powered audio devices such as MP3 and CD players, mobile phones, PDAs, portable DVD players, and any other hand-held battery-powered device. AS1702, AS1703, AS1704, AS1705 OUT+ Single Supply 2.7 to 5.5V SHDN IN+ IN- OUT- SHDM RL = 4 or 8 Ω + – GND |
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