preliminary pt2337 stereo 2w class-d amplifier with built-in audio processor tel: 886-66296288 ? fax: 886-29174598 ? http://www.princeton.com.tw ? 2f, 233-1, baociao road, si ndian, taipei 23145, taiwan description the pt2337 is an integrated audio amplifier design for the low voltage (5v) application purpose, built-in stereo 2w class-d power amplifier with audio processor, it provides 4 stereo sources selector, and all signal process is based on pure analog processing to maintain high performances and low power consumption. the audio processor includes all the advanced control functions such like digital controlled volume, treble and bass control. the whole chip functions are controlled via i 2 c bus. applications ? portable player duck speaker system ? portable media player ? digital photo frame ? flat panel display and tv ? other audio applications features ? supply voltage: 3 ~ 6v ? 2w x 2 class-d power amplifier (vdd=5v, rl=4 ? ) ? 4 stereo inputs ? 32 steps, independent channel volume controller ? bass and treble control. ? 2 voltage gain setting for power amp, (20db, 26db) ? pop-free circuitry eliminates unpleasant noises during power on/off. ? low power shutdown ? high psrr ? high rf radiation immunity. ? over heat/over current protection ? controlled by i 2 c interface ? pin-compatible with pt2334 (partly functions compatible) ? lqfp 48 pins package block diagram l1 l2 l3 l-vol class-d lch 2w class-d rch 2w r-vol r3 r2 r1 lop lon ron rop vref power management byp ass gnd agnd rvdd rgnd lvdd lgnd oe cont rol int e rface sda scl sd vref vref rb1 rt rb2 bass treble lt lb1 lb2 r4 l4 rout ri np ri nn linn linp lout avdd vdd bass treble
pt2337 pre1.1 2 july, 2009 application circuit 0.1uf 1uf 1nf 1nf 1nf 1nf fb fb fb fb 10 +5v 100uf 10uf rsp k lspk 0.1u 2.2uf fb 820p 68n 68n 8.2k 820p 68n 68n 8.2k 0.47uf host mcu 0.47uf 0.47uf 0.47uf 0.47uf 0.47uf 0.47uf 0.47uf 0.47uf 0.1uf 0.47uf 0.47uf 0.22uf 0.47uf 2.2uf 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 ro p rgnd nc rvdd ro n rout lon lvdd nc lgnd lop l1 l2 l3 r1 r2 r3 rb1 rb2 rt lb1 lb2 lt nc nc avdd agnd bypass nc nc nc sd oe nc sda scl nc nc l4 r4 vdd lout gnd 45 linn 46 linp 47 rinn 48 rinp nc pt2337 source 2 source 3 source 4 source 1 l1 l2 l3 l4 r1 r2 r3 r4
pt2337 pre1.1 3 july, 2009 order information valid part number package type top code PT2337-LQ (l) 48 pins, lqfp PT2337-LQ pin configuration
pt2337 pre1.1 4 july, 2009 pin description pin name i/o description pin no. rinn i negative input of ri ght channel class-d amp 1 avdd p power input for analog circuits 2 oe i output enable setting, connect a 0.22 f cap to gnd. 3 sd i shutdown. sets to low level will turn off w hole chip and pull up to high level is back to normal operation. 4 sda i i 2 c bus data input 5 scl i i 2 c bus clock input 6 rout o right channel line out 7 rb1 i capacitor 1 for right channel bass controller 8 rb2 o capacitor 2 for right channel bass controller 9 rt i capacitor for right channel treble controller 10 r4 i input 4 of right channel 11 r3 i input 3 of right channel 12 r2 i input 2 of right channel 13 r1 i input 1 of right channel 14 nc - no connect 15 nc - no connect 16 nc - no connect 17 nc - no connect 18 nc - no connect 19 nc - no connect 20 l1 i input 1 of left channel 21 l2 i input 2 of left channel 22 l3 i input 3 of left channel 23 l4 i input 4 of left channel 24 lt i capacitor for left channel treble controller 25 lb2 i capacitor 2 for left channel bass controller 26 lb1 o capacitor 1 for left channel bass controller 27 lout o left channel line out 28 nc - no connect 29 nc - no connect 30 gnd p ground 31 bypass p bypass cap for internal voltage refe rence, a 2.2f cap is recommended. 32 vdd p power input 33 nc - no connect 34 agnd p ground for analog circuits 35 linn i negative input of left channel class-d amp 36 linp i positive input of left channel class-d amp 37 nc - no connect 38 lon o negative output of left channel class-d amp 39 lgnd p power ground of left channel class-d amp 40 lvdd p power input of left channel class-d amp 41 lop o positive output of left channel class-d amp 42 rop o positive output of right channel class-d amp 43 rvdd p power input of right channel class-d amp 44 rgnd p power ground of right channel class-d amp 45 ron o negative output of ri ght channel class-d amp 46 nc - no connect 47 rinp i positive input of right channel class-d amp 48
pt2337 pre1.1 5 july, 2009 important notice princeton technology corporation (ptc ) reserves the right to make co rrections, modifications, enhancements, improvements, and other changes to its products and to discontinue any product without notice at any time. ptc cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a ptc product. no circuit patent licenses are implied. princeton technology corp. 2f, 233-1, baociao road, sindian, taipei 23145, taiwan tel: 886-2-66296288 fax: 886-2-29174598 http://www.princeton.com.tw
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