esmt preliminary ad5265a elite semiconductor memory technology inc. publication date: aug. 2008 revision: 0.4 1/25 2.5w/ch stereo filter-less class-d audio amplifier with headphone driver features z supply voltage range: 2.5 v to 5.5 v z support single-ended or differential analog input z low static operation current z low shut-down current z short power-on transient time z two volume control modes ? dc volume control from -38db to +20db ? 4-step volume gain of +6, +12, +18, +24db z independent shut-down control for left or right channel z short-circuit and thermal protection z loudspeaker power within 10% thd+n ? 1.5w/ch into 8 loudspeaker ? 2.5w/ch into 4 loudspeaker z loudspeaker efficiency ? 90% @ 8 , p o,10% thd+n ? 85% @ 4 , p o,10% thd+n z headphone power within 1% thd+n ? 120mw/ch into 16 headphone applications z monitor audio z pda z portable multimedia devices z notebook computer z mobile phone description the ad5265a is a stereo, filter-less class-d audio amplifier with headphone driver. operating with 5.0v loudspeaker driver supply, it can deliver 2.5w/ch output power into 4 loudspeaker within 10% thd+n and 120mw/ch output power into 16 headphone within 1% thd+n. the ad5265a has two volume control modes by setting mode pin. while mode pin is set logic high, ad5265a is in dc volume control mode with 31-step volume gain from -38 db to +20db, adjusted by the dc voltage applied on g0 pin. otherwise, ad5265a is the 4-step volume gain mode with +6db, +12db, +18db, and +24db gain, selected by setting g0 and g1 pins. the two volume adjustment modes are designed to fit the different volume control requirements in various applications. not only the stereo class-d amplifier, ad5265a also has a fixed gain (-1v/v) stereo class-ab headphone driver. the ad5265a packaged as e-tssop 24l 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. with the independent shut-down control for left or right channel, the ad5265a is more convenient to control the left and right channels. ordering information part number package comments AD5265A-SEG e-tssop 24l pb-free
esmt preliminary ad5265a elite semiconductor memory technology inc. publication date: aug. 2008 revision: 0.4 2/25 pin assignments pin description name typ description characteristic 1 inl- i left channel input (-) 2 inl+ i left channel input (+) 3 hp_spk i 0: spk mode; 1: hp mode 4 g1 i gain selection with 300 k pull-low resistor 5 hpl o left channel headphone driver 6 outl+ o left channel output (+) 7 pvddl p high current power supply 8 pgndl g high current ground 9 outl- o left channel output (-) 10 agnd g ground 11 mode i 0: 4-gain control; 1:dc vol. control with 300 k pull-low resistor 12 sdl i shut-down left channel (low active) with 300 k pull-low resistor 13 sdr i shut-down right channel (low active) with 300 k pull-low resistor 14 avdd p power supply 15 n.c. x n.c. 16 outr- o right channel output (-) 17 pgndr g high current ground 18 pvddr p high current power supply 19 outr+ o right channel output (+) 20 hpr o right channel headphone driver 21 g0 i gain selection(mode =0) /dc vol. level(mode=1) 22 vref o reference voltage 23 inr+ i right channel input (+) 24 inr- i right channel input (-) thermal pad g must be soldered to pcb?s ground plane
esmt preliminary ad5265a elite semiconductor memory technology inc. publication date: aug. 2008 revision: 0.4 3/25 functional block diagram available package package type device no. ja ( o c/w) exposed thermal pad e-tssop 24l ad5265a 32.3 yes (note1) note1: the thermal pad is at the bottom of p ackage. to optimize the performance of thermal dissipation, solder the thermal pad to pcb?s ground plane is suggested. absolute maximum ratings symbol parameter min max unit avdd power supply for lower power analog cells 2.5 5.5 v pvddl(r) power supply for loudspeaker driver 2.5 5.5 v input voltage -0.3 avdd v t stg storage temperature -65 150 o c t a ambient operating temperature 0 70 o c
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