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AS1702-T Datasheet(PDF) 1 Page - ams AG |
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AS1702-T Datasheet(HTML) 1 Page - ams AG |
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1 / 20 page  AS1702 - AS1705 1.8W Single-Channel Audio Power Amplifiers Dat a Sh eet www.austriamicrosystems.com Revision 1.47 1 - 20 1 General Description The AS1702 - 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-pow- ered 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 high-fidelity audio power amplification. The devices deliver 1.8W 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. For reduced component designs, the devices are avail- able with different gain levels as shown in Table 1. 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 active-high or active-low. All devices contain click- and-pop suppression circuitry that reduces audible clicks and pops during power-up and shutdown. The AS1702 - AS1705 are pin compatible with the LM4895 and the MAX9718A/B/C/D. The devices are available in a 10-pin MSOP package and a 10-pin DFN package. Figure 1. Simplified Block Diagram 2 Key Features ! 2.7 to 5.5V (VCC) Single-Supply Operation ! THD+N: 1.8W 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 to National Semiconductor LM4895 (AS1705) and Maxim MAX9718A/B/C/D ! Operating Temperature Range: -40 to +85ºC ! Package Types - 10-pin MSOP - 10-pin DFN 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. Table 1. Standard Products Model Gain AS1702 Adjustable (via external components) AS1703 AV = 0dB AS1704 AV = 3dB AS1705 AV = 6dB AS1702/AS1703/ AS1704/AS1705 Single Supply 2.7 to 5.5V RL = 4 or 8 Ω + – 4 IN+ 10 OUT+ 2 IN- 1 SHDN 3 SHDM 6 OUT- 9 VCC 7 GND |
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