esmt/emp preliminary AD52655 elite semiconductor memory technology inc./elite micropower inc. publication date: may 2011 revision: 0.2 1/21 2.5w/ch stereo filter-less class-d audio amplifier with power limit function features z supply voltage range: 3.0 v to 5.0 v z 2.5w power limit function z 10ma static operation current z <1ua shutdown current z 64-step dc volume cont rol from mute to +24db z overload and thermal protection z loudspeaker output power @ 1% thd+n ? 1.4w/ch into 8 loudspeaker ? 2.45w/ch into 4 loudspeaker applications z monitor audio z portable multimedia devices z mobile phone description the AD52655 is a stereo, filter-less class-d audio amplifier with 2.5w power limit. operating with 5.0v loudspeaker driver supply, it can deliver 2.45w/ch output power into 4 loudspeaker within 1% thd+n. the AD52655 has not only a 64-step dc volume controller, but also a 2.5w power limiter, which implement with an automatic gain controller (agc). the AD52655 is packaged as ssop-24l(150mil) is a stereo audio amplifier with high efficiency, which leads to longer battery life, less heat sink requirement, smaller board size and lower system cost, and suitable for the notebook computer, and portable multimedia devices. ordering information product id package packing comments AD52655-st24nat ssop-24l tube 5.6k units / box green typical application circuit
esmt/emp preliminary AD52655 elite semiconductor memory technology inc./elite micropower inc. publication date: may 2011 revision: 0.2 2/21 pin assignments pin description name typ description characteristic 1 la o speaker driver_left (+) 2 pgndl g power ground_left 3 pgndl g power ground_left 4 lb o speaker driver_left (-) 5 pvddl p power supply_left 6 mute# i mute(low acti ve) internal pull-up 7 avdd p analog power supply 8 inl i single-ended audio input_left 9 n.c. x no connection 10 vdc i full scale level for gain control section internal pull-up 11 volume i dc voltage for gain setting internal pull-up 12 n.c. x no connection 13 n.c. x no connection 14 vref i avdd/2 reference voltage_right 15 n.c. x no connection 16 n.c. x no connection 17 inr i single-ended audio input_right 18 agnd g analog power ground 19 sd# i shutdown(low active) internal pull-down 20 pvddr p power supply_right 21 rb o speaker driver_right (-) 22 pgndr g power ground_right 23 pgndr g power ground_right 24 ra o speaker driver_right (+)
esmt/emp preliminary AD52655 elite semiconductor memory technology inc./elite micropower inc. publication date: may 2011 revision: 0.2 3/21 functional block diagram +- + - +- + - lin rin vref +- + - modulator power stage +- + - modulator power stage la lb ra rb c1 c1 c1 volume controller (64-step volume, power limit) triangular wave generator vtri clk vcnt ot/uv pvddlpvdd ravdd pgndlpgn dragnd sd# mute# vdc volume available package package type device no. ja ( /w) jc ( /w) ssop-24 AD52655 90 17 note 1: ja is measured on a room temperature (t a =25 ), natural convection environment test board, which is constructed with a thermally efficient, 2-la yers pcb. the measurement is tested using the jedec51-3 thermal measurement standard. note 2: jc represents the heat resistance for the heat flow between the chip and the package?s top surface. marking information AD52655 line 1 : logo line 2 : product no. line 3 : tracking code line 4 : date code e s m t a d 5 2 6 5 5 t r a c k i n g c o d e d a t e c o d e
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