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tel: 886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2353 v1.2 - 1 - march, 2006 satellite + subwoofer 3-speaker system electronics crossover ic pt2353 description pt2353 is a 3-speaker system electr onic crossover ic utilizing cmos technology specially designed for the new generation of audio equipments. 3-channel electronic volume control, 2-channel 2nd order high pass filter, 2nd order low pass filter and one mono subwoofer audio output are incorporated into a single high performance chips. pt2353 combines t he electronic volume controller and crossover circuitry without mcu handling. pin assignments and application circuit are optimized for easy pcb layout and cost saving advantages. features ? cmos technology ? low power consumption ? 2 built-in individual volume control: 0db to -60db ? 2-channel 2nd order high pass filter + 1 mixed mono subwoofer low pass filter ? cross-over frequency adjustable by external passive components ? control interface of volume control: up/down key (mcu is not necessary) ? built-in 3d effect and loudness function ? supply voltage: 5v to 9v application ? audio equipments
tel: 886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2353 v1.2 - 2 - march, 2006 satellite + subwoofer 3-speaker system electronics crossover ic pt2353 block diagram lin lout rin vd d ref ref ref ref ref vss rout sou t subwoofer volume main volume main volume 3d e ffec t circuit lpf control unit + hpf hpf + + + vdd 3d po /mdw /mup /sup /sdw /3d /pk
tel: 886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2353 v1.2 - 3 - march, 2006 satellite + subwoofer 3-speaker system electronics crossover ic pt2353 pin configuration po 1 3 2 5 4 8 7 6 10 9 12 11 pt2353 28 26 27 24 25 21 22 23 19 20 17 18 14 13 15 16 /3d vss lout lin lt cl1 cl2 cl3 /sup /sdw /mup /mdw osc /pk sout c1p 3d_led vdd rout rin rt cr1 cr2 cr3 c2 ref c1n
tel: 886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2353 v1.2 - 4 - march, 2006 satellite + subwoofer 3-speaker system electronics crossover ic pt2353 pin configuration pin name i/o description pin no. /3d i 3d effect enable pin (low: active) 1 vss D ground pin 2 lout o left channel output pin 3 lin i left channel input pin 4 lt i left channel center tap (loudness) pin 5 cl1 i left channel high pass filter capacitor pin 1 6 cl2 i left channel high pass filter capacitor pin 2 7 cl3 i left channel high pass filter capacitor pin 3 8 /sup i subwoofer channel volume up control pin (low: active) 9 /sdw i subwoofer channel volume down control pin (low: active) 10 /mup i main volume up control pin (low: active) 11 /mdw i main volume down control pin (low: active) 12 osc i oscillation pin (connects to external rc components) 13 /pk i po control pin (low: active) 14 po o power amplifier control pin (controlled by pk pin 14) 15 sout o subwoofer channel output pin 16 c1p i low pass filter external capacitor pin 17 c1n i low pass filter external capacitor pin 18 ref i reference voltage = ? vdd 19 c2 i low pass filter external capacitor pin 2 20 cr3 i right channel high pass filter capacitor pin 3 21 cr2 i right channel high pass filter capacitor pin 2 22 cr1 i right channel high pass filter capacitor pin 1 23 rt i right channel volume center tap (loudness) pin 24 rin i right channel input pin 25 rout o right channel output pin 26 vdd D positive power supply 27 3d-led o 3d led indicator pin 28
tel: 886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2353 v1.2 - 5 - march, 2006 satellite + subwoofer 3-speaker system electronics crossover ic pt2353 function description volume control both main volume control and subwoofer volume c ontrol are supported by pt2353. please refer to the diagram below. signal source lpf hpf main volume output (only one channel is shown) subwoofer volume control subwoofer output main volume control the main volume control is used to adjust all audio volume levels. the subwoofer volume control can be adjusted to match the main volume control. the main volume control is determined by the mup and/ mdw pins. if the /mup is connected to the ground, the main volume level output may be increased. if the /mdw is connected to the ground, the main volume level output can be decreased. the subwoofer volume control is determined by the /sup and /sdw pins. if the /sup is connected to ground, the subwoofer volume leve l output can be increased. if the /s dw is connected to the ground, the subwoofer volume level output can be decreased. when each of the /mup, /mdw, /sup, /sdw pins ar e connected to the gnd fo r an indefinite period of time, please refer to the following diagram. t t /mpu , /mdw, /sup, /sdw input status vo lum e con tro l statu s notes: 1. t=default key time 2. t=hold time (10 x 1/fosc) 3. =volume up/down switch time (2 x 1/fosc) 4. fosc=internal oscillation frequency
tel: 886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2353 v1.2 - 6 - march, 2006 satellite + subwoofer 3-speaker system electronics crossover ic pt2353 volume attenuation a pt2353 volume control circuit consists of ladder resistors and analog switches. the tap for loudness function (lt & rt) is connected to the step 6 (-20db). therefore, the loudness function effect will be clearly audible when the volume setti ng is less than -20db. please refer to the attenuation table given below. step attenuation step attenuation 0 0 16 -32 1 -2 17 -34 2 -4 18 -36 3 -6 19 -38 4 -8 20 -40 5 -10 21 -42 6 -12 22 -44 7 -14 23 -46 8 -16 24 -48 9 -18 25 -50 10 -20 26 -52 11 -22 27 -54 12 -24 28 -56 13 -26 29 -58 14 -28 30 -60 15 -30 31
tel: 886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2353 v1.2 - 7 - march, 2006 satellite + subwoofer 3-speaker system electronics crossover ic pt2353 the equivalent circuit is shown below. out in 29k lt 22k agnd step 0 step 1 step 2 step 9 step 10 step 11 step 31 step 30 volume initialization after power is turned on, the volume control value of the main channel is set to the initial setting of -30db step while the subwoofer channel will be set at 0db. the pt2353 loudness frequency response curve from step 0 to step 31 is given below. step 0 step 31
tel: 886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2353 v1.2 - 8 - march, 2006 satellite + subwoofer 3-speaker system electronics crossover ic pt2353 filter the main channel of pt2353 includes the high pass filter which is used to filter out the main speaker?s low frequency characteristics. the filtered signal is then combined with the subwoofer low pass filter characteristics. this high pass filter is of sa llen key type with a pass band gain equivalent to 0db. adjustment of the crossover frequency is made via t he two external capacitors. please refer to the figure below. ref lout/rou t c c cl2 cl3 cl1 signal in + subwoofer channel mixed from the main channel also uses the sallen key type low pass filter to filter out the high frequency characteristics. tw o external capacitors can be used to adjust the crossover frequency. please refer to the diagram below. sou t c1 c2 signal in ref
tel: 886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2353 v1.2 - 9 - march, 2006 satellite + subwoofer 3-speaker system electronics crossover ic pt2353 the subwoofer in this 3-speaker system has onl y one channel output; therefore, it is recommended that the lpf must be less than 300hz. if the frequen cy is greater than 300 hz, then the audio output is can be clearly discernible. that is, it is easy to know where the sound is coming from. the following diagram provides the suggested crossover fr equencies and respective external capacitors. notes: ??? crossover frequency: 280hz, c=0.015 f, c1=0.047 f, c2=0.018 f - - - crossover frequency: 200hz, c=0.022 f, c1=0.068 f, c2=0.027 f ? ? crossover frequency: 120hz, c=0.033 f, c1=0.1 f, c2=0.047 f c is the high pass filter external capacitor. c1 and c2 are the low pass filter external capacitors
tel: 886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2353 v1.2 - 10 - march, 2006 satellite + subwoofer 3-speaker system electronics crossover ic pt2353 3d effect function the 3d pin controls the 3d effect function of pt2353. it toggles between turning the 3d effect function on or off. when the 3d effect f unction is enabled, the 3d led is di splayed. when the po pin in low state the 3d function and 3d led is both inhibited. power control pk (pin 14) is the po control pin and is used to toggle between activating and deactivating the po pin (pin 15). the power amplifier stat us (on or off) may be controlled by connecting the external power amplifier device to the po pin. after the power supply is first applied to the vdd pi n of pt2353, the output stat e for the po and 3d pins is low. during this state, all t he control function keys are disabled, with the exception of the pk key. when the pk key is pressed once, the po is set to high and all t he control function keys are activated.
tel: 886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2353 v1.2 - 11 - march, 2006 satellite + subwoofer 3-speaker system electronics crossover ic pt2353 absolute maximum rating parameter symbol rating unit operating voltage vs 10.2 v ambient temperature topr -40 to +85 storage temperature tstg -65 to +150 electrical characteristics (unless otherwise specified, tamb=25 , vdd=9v, rl=100k , f=1khz) parameter symbol condition min. typ. max. unit power supply vdd 5 - 9.5 v operating current is 3d, pk off, vdd=9v 3d, pk off, vdd=4.5v - - 23 18 - - ma ma att=0db, f=1khz vin=1vrms, 20hz ~ 20khz all filters bypass, all outputs - 0.01 - total harmonic distortion thd att=-20db, f=1khz vin=1vrms, 20hz ~ 20khz all filters bypass, all outputs - 0.05 - % output noise no att=0db, vin=0v a-weighting, all filters bypass - 15 - v signal-to-noise ratio s/n 0db=1vrms, att=0db vin=0v, a-weighting all filters bypass - 90 - db maximum input voltage vimax f=1khz, att=0db vdd=9v - - 2.7 - vrms voltage gain gn f=1khz, att=0db all outputs -1 0 +1 db cross talk ct 0db=1vrms, f=1khz vin=1vrms, rl=100k rg=600 ? , a-weighting - -86 - db f=1khz, vin=1vrms lout, rout - -75 - db maximum volume attenuation attmax main volume =max, sout - -75 - db high level input voltage vih 6.7 - 9 v low level input voltage vil 0 - 3.2 v led sink current is 3d led pin - 6 - ma drive current io po - 5 - ma output impedance ro vout=100mv f=1khz 70 100 130 ? input impedance ri 40 50 60 k ?
tel: 886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2353 v1.2 - 12 - march, 2006 satellite + subwoofer 3-speaker system electronics crossover ic pt2353 application circuit /3d vss lout lin lt cl1 cl2 cl3 /sup /sdw /mup /mdw osc /pk 3d_led vdd rout rin rt cr1 cr2 cr3 c2 ref c1n c1p sout po 100k 33k 10uf 10uf 100uf c2 c1 u33 3d /sup 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 2k2 220 c c c c /sdw /mup /mdw power key 100k 3d led 100uf 2k2 220 100k 8n2 10uf 1k bav99 10uf 100k 8n2 u33 1k 2u2 bav99 10uf 100k * l out vdd 9v vdd 9v vdd 9v r out vdd 9v r in ref ref ref s out l in ** ** ** ** notes: please refer to the pt2353 crossover frequency response curve for the values of c, c1, and c2. please refer to power control (po) section of this document. ** for input port high voltage pulse protection. pt2353
tel: 886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2353 v1.2 - 13 - march, 2006 satellite + subwoofer 3-speaker system electronics crossover ic pt2353 order information valid part number package type top code pt2353 28 pins, dip, 600mil pt2353 pt2353-s 28 pins, sop, 300mil pt2353-s
tel: 886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2353 v1.2 - 14 - march, 2006 satellite + subwoofer 3-speaker system electronics crossover ic pt2353 package information 28 pins, dip, 600mil
tel: 886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2353 v1.2 - 15 - march, 2006 satellite + subwoofer 3-speaker system electronics crossover ic pt2353 symbol min. max. a - 6.35 a1 0.39 - a2 3.18 4.95 b 0.356 0.558 b1 0.77 1.77 c 0.204 0.381 d 35.1 39.7 d1 0.13 - e 15.24 15.87 e1 13.32 14.73 e 2.54 bsc. ea 15.24 bsc. eb - 17.78 l 2.93 5.08 notes: 1. controlling dim ension: millimeter 2. dimensioning and toleranc ing per ansi y14.5m-1982. 3. dimensions ?a?, ?a1?< and ?l? are measured with the package seated in jedec seating plane gauge gs-3. 4. ?d? and ?e1? are dimensions for plastic packages , do not include mold flash or protrusions. mold flash or protrusions shall not exceed 0.10 inch (0.25mm). 5. ?e? and ?a? are measured with the leads constrained to be perpendicular to plane t. 6. ?eb? and ?oc? are measured at the lead tips with the leads unconstrained. ?oc? must be zero or greater. 7. n is the maximum number of terminal positions. (n=28) 8. corner leads (i, n, n/2+1) may be configured as shown in figure 2. 9. pointed or rounded lead tips ar e preferred to ease insertion. 10. for automatic insertion, any raised irregularit y on the top surface (step, mess, etc.) shall be symmetrical about the lateral and longitudinal package centerlines. 11. please refer to jedec ms-011 variation ab. jedec is the trademark of jedec so lid state technology association.
tel: 886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2353 v1.2 - 16 - march, 2006 satellite + subwoofer 3-speaker system electronics crossover ic pt2353 28 pins, sop, 300mil symbol min. nom. max. a 2.35 2.65 a1 0.10 0.30 b 0.33 0.51 c 0.23 0.32 d 17.70 18.10 e 7.40 7.60 e 1.27 bsc. h 10.00 10.65 h 0.25 0.75 l 0.40 1.27 0 8
tel: 886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2353 v1.2 - 17 - march, 2006 satellite + subwoofer 3-speaker system electronics crossover ic pt2353 notes: 1. dimensioning and toleranc ing per ansi y14.5-1982. 2. dimension ?d? does not include mold flash , prot rusions or gate burrs. mold flash, protrusion or gate burrs shall not exceed 0.15mm (0.006 in) per side. 3. dimension ?e? does not include interlead flash or protrusions. interlead flash or protrusions shall not exceed 0.25 mm (0.010 in) per side. 4. the chamfer on the body is optional . it is not present, a visual index feature must be located within the crosshatched area. 5. ?l? is the length of the termi nal for soldering to a substrate. 6. ?n? is the number of terminal positions. (n=28) 7. the lead width ?b? as measured 0.36 mm (0.014 in ) or greater above the s eating plane, shall not exceed a maximum value of 0.61 mm (0.24 in). 8. controlling dim ension: millimeter 9. refer to jedec ms-013 variation ae jedec is the trademark of jedec so lid state technology association.

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