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tel:886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2256 v1.7 - 1 - august, 2006 electronic volume controller ic pt2256 description pt2256 is an electronic volume controller ic utiliz ing cmos technology specially designed for use on audio equipment. it has 2 built-in channels making it ideally suitable for mono and stereo sound applications. pt2256 provides the loudness function, a wide frequency response range and a very low total harmonic distortion, t hereby guaranteeing a highly effective and reliable performance. it is housed in 16-pin dip or sop pack age and is functionally compatible with tc9235p. pin assignments and application circuit are optimized for low cost advantages and easy pcb layout. features ? cmos technology ? low power consumption ? least external components ? 2 channels in the same chip ? 0db to -78db attenuation can be controlled by up and down pin ? 20db tap for loudness circuit ? built-in dc output circuit (8 levels) for volume level metering ? wide frequency response range ? low total harmonic distortion ? available in 16 pins dip or sop application ? audio equipment volume control
tel:886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2256 v1.7 - 2 - august, 2006 electronic volume controller ic pt2256 block diagram decoder up/down counter control d/a converter /u p agnd lt 1 in 1 out1 vss /d n osc /r st /inh dco agnd lt 2 in 2 out2 vd d
tel:886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2256 v1.7 - 3 - august, 2006 electronic volume controller ic pt2256 pin configuration vss out1 in1 lt1 agnd /up /dn osc vdd out2 in2 lt2 a gnd dco / inh / rst 1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 pt2256
tel:886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2256 v1.7 - 4 - august, 2006 electronic volume controller ic pt2256 pin description pin number i/o description pin no. vss - negative power supply 1 out1 o volume output pin 1 2 in1 i volume input pin 1 3 lt1 o tap output pin 1 for loudness function 4 agnd - analog ground pins 1 5, 12 up i volume up control input pin. the 1 step/1 push volume is controlled by pressing the up key. if the key has been pushed continuously increase. built-in pull-up resistor. 6 dn i volume down control input pin. the 1 step/1 push volume is controlled by pressing the down key. if the key is continuously pressed, the volume control will continuously decrease. built-in pull-up resistor. 7 osc i/o oscillation pin. the oscillation circuit of a resistor and capacitor connection. oscillator is activated when the key is pressed. 8 rst i reset pin. this pin sets the initial volume level. the volume level is set to -46db by ?l? input. built-in pull-up resistor low active 9 /inh i backup mode input pin 10 dco o dc output pin for volume level meter 11 lt2 o tap output pin 2 for loudness function 13 in2 i volume input pin 2 14 out2 o volume output pin 2 15 vdd - positive power supply 16
tel:886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2256 v1.7 - 5 - august, 2006 electronic volume controller ic pt2256 function description attenuation the pt2256 volume control circuit consists of ladder resistors and analog switches. the tap for loudness function is connected to the step 10 (-20db). when the (3.9k ? ) resistor is connected between lt and agnd pins, the attenuation is given in table below. the equivalent circuit is shown below: step attenuation (db) step attenuation (db) 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 -46 7 -14 23 -50 8 -16 24 -54 9 -18 25 -58 10 -20 26 -62 11 -22 27 -66 12 -24 28 -70 13 -26 29 -74 14 -28 30 -78 15 -30 31 out in lt agnd step 0 step 1 step 9 step 10 step 11 step 31 step 30 29k ? 22k ? step 2 note: step 22 has an initial value of -46db.
tel:886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2256 v1.7 - 6 - august, 2006 electronic volume controller ic pt2256 dc output for volume level the dc output for the volume level meter is inter nally connected to the d/a converter. pt2256 has 8 stages of output voltage with each stage corresponding to a particular volume level. please refer to the table below: step attenuation (db) output voltage (v) 0-3 0-6 7/8 vdd 4-7 8-14 6/8 vdd 8-11 16-22 5/8 vdd 12-15 24-30 4/8 vdd 16-19 32-38 3/8 vdd 20-23 40-50 2/8 vdd 24-27 54-66 1/8 vdd 28-31 70- 0 up/down volume control pt2256 features two volume control pins, namely: up and dn. up is the control pin used to increase volume level while the dn is the control pin used to decrease the volume level. thus, volume level may regulated using the up or down keys. these ke ys are operated on a 1 step/1 push volume level control when up or dn keys are set to ?l? level. if the keys are continuously pressed (input ?low?), then the volume level continuously steps up or down as the case maybe. please refer to the diagram below for the timing of the key input. tt a /up, /dn input volume level control notes: 1. t= preventive time for chattering (2.2 x 1/fosc ) 2. t= switching time to automatic mode (10 x 1/fosc) 3. a=up, down speed (2x1/fosc)
tel:886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2256 v1.7 - 7 - august, 2006 electronic volume controller ic pt2256 initialization when power on pt2256 has an auto-initialization func tion during the power on period. when power is turned on, the volume level is set to the initial value of -46 db by setting the rst pin to ?l? level. please refer to the diagram below. vdd /rst 0v vil vdd t t1ms back up when power off when the /inh pin is set at ?l? level, all i nput and output pins are disabled and the current consumption is reduced to the minimum. under this condition, the backup becomes possible. please refer to the diagram below: vdd vdd 0v 4.5v normal mode backup mode normal mode backup vdd min > 4.5v backup d ata is lost the backup circuit is given below: in4001 10k 1000 f/16v + - 10k 51k pt2256 vdd vss /i nh vdd vss note: if the vdd drops from 12v to 4.5v, then the backup is possible for a period of 6 days. however, if vdd-vss drops below 4.5v, the backup becomes impossible.
tel:886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2256 v1.7 - 8 - august, 2006 electronic volume controller ic pt2256 loudness frequency response the figure below shows the loudness frequency response diagram. - 66db - 78db - 54db 0db -6db -12db -42db
tel:886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2256 v1.7 - 9 - august, 2006 electronic volume controller ic pt2256 absolute maximum ratings (unless otherwise stated, ta=25 ) parameter symbol rating unit supply voltage vdd -0.3 to 13 v input voltage vin -0.3 to vdd+0.3 v power dissipation pd 300 mw operating temperatur e topr -40 to +85 storage temperature tstg -65 ~ +150
tel:886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2256 v1.7 - 10 - august, 2006 electronic volume controller ic pt2256 electrical characteristics (unless otherwise stated, ta=25 , vdd=9v) parameter symbol test condition min. typ. max. unit operating supply voltage vdd 4.5 9.0 12 v operating supply current idd no load, fosc=20hz - 0.3 1.0 ma stand-by current isb osc=0v, /inh=0v - 0.1 10 a backup voltage vod 2.0 - 12 v backup current iod /inh pin=0v - 0.1 1.0 a /up, /dn, /rst 0.7vdd - vdd high level input voltage vih /inh 0.8vdd - vdd v /up, /dn, /rst 0 - 0.3vdd low level input voltage vil /inh 0 - 0.7vdd v between in~agnd resistor 45 51 75 between in~lt resistor 26 29 45 voltage resistor rvr between lt~agnd resistor 19 22 32 k ? high level input current iih /inh input pin. vil=vdd -1 - 1 a low level input current iil /inh input pin, vin=0v -1 - 1 a pull-up resistor rup /up, /dn, /rst input pin 90 110 130 k ? analog switch on resistor ron when 0db, between in1~out1 and in2~out2 resistor - 250 400 ? attenuation error att test attenuation value - 0 2.0 db balance between left and right rvr volume resistor error between left and right - 0 3.0 % total harmonic distortion thd 0db - 0.01 - % maximum attenuation attmax db - 80 - db cross noise ct 0db - 80 - db output noise vn fin=1khz. vin=1vrms, rl=100k , rg=600 0db - -90 - db osc frequency fosc cx=2.2f, rx=33k - 18 - hz output resistance rout fin=1khz, vin=1vrms, volume control=0db 550 650 750 ? vdd=9v - - 3.5 maximum input amplitude vin fin=1khz, volume control=0db, thd<0.08% vdd=12v - - 4.0 vrms
tel:886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2256 v1.7 - 11 - august, 2006 electronic volume controller ic pt2256 application circuit single power supply (no loudness and no backup circuit) l-ch output r-ch output r-ch input l-ch input rx cx vss out1 in1 lt1 agnd /up /dn osc vdd out2 in2 lt2 agnd dco /inh /rst pt2256 100k 3.9k 3.9k 10 f 10 f up key down key 0.1 f 10 f 10 f 0.1 f 10k 10k 100 f vdd (4.5 to 12v) + + + + + + note: modifying the values of rx and cx affects the osc illator frequency of the ic. if the fosc value is big, then the volume control change is fa st. likewise, if the fosc value is small, the volume control change is slow. it is suggested that rx=33k, cx=2.2f. the table for the rx, cx and fosc values are given below: rx cx fosc rx cx fosc 33k 1.0 f 34.1hz 33k 1.0 f 34.1hz 33k 2.2 f 17.8hz 51k 1.0 f 22.7hz 33k 10 f 3.4hz 100k 1.0 f 11.8hz
tel:886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2256 v1.7 - 12 - august, 2006 electronic volume controller ic pt2256 including loudness but no backup circuit l-ch output r-ch outpu t r-ch input l-ch input rx cx 8.2nf 8.2nf 820 ? vss out1 in1 lt1 agnd /up /dn osc vdd out2 in2 lt2 agnd dco /inh /rst pt2256 100k 820 ? 820 ? 820 ? 0.1 f 10 f 10 f up key down key 0.1 f 10 f 10 f 0.1 f 0.1 f 10k 10k 100 f vdd (4.5 to 12v) + + + + + + note: modifying the values of rx and cx affects the osc illator frequency of the ic. if the fosc value is big, then the volume control change is fas t. likewise, if the fosc value is small, the volume control change is slow. it is suggested that rx=33k, cx=2.2f. the table for the rx, cx and fosc values are given below. rx cx fosc rx cx fosc 33k 1.0 f 34.1hz 33k 1.0 f 34.1hz 33k 2.2 f 17.8hz 51k 1.0 f 22.7hz 33k 10 f 3.4hz 100k 1.0 f 11.8hz
tel:886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2256 v1.7 - 13 - august, 2006 electronic volume controller ic pt2256 order information part number package top code pt2256 16 pins, dip, 300mil pt2256 pt2256-s 16 pins, sop, 300mil pt2256-s pt2256-sn 16 pins, sop, 150mil pt2256-sn pt2256 (l) 16 pins, dip, 300mil pt2256 pt2256-s (l) 16 pins, sop, 300mil pt2256-s pt2256-sn (l) 16 pins, sop, 150mil pt2256-sn notes: 1. (l), (c) or (s) = lead free. 2. the lead free mark is put in front of the date code.
tel:886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2256 v1.7 - 14 - august, 2006 electronic volume controller ic pt2256 package information 16pins, dip, 300mil
tel:886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2256 v1.7 - 15 - august, 2006 electronic volume controller ic pt2256 symbol min. nom. max. a - - 0.210 a1 0.015 - - a2 0.115 0.130 0.195 b 0.014 0.018 0.022 b1 0.014 0.018 0.020 b2 0.045 0.060 0.070 b3 0.030 0.039 0.045 c 0.008 0.010 0.014 c1 0.008 0.010 0.011 d 0.780 0.790 0.800 d1 0.005 - - e 0.300 0.310 0.325 e1 0.240 0.250 0.280 e 0.100 bsc ea 0.300 bsc eb - - 0.430 ec 0.000 - 0.060 l 0.115 0.130 0.150 notes: 1. all dimensions are in inches. 2. dimensioning and toleranci ng 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?, ?d1? and ?e1? dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed 0.010 inch. 5. ?e? and ?ea? measured with the leads c onstrained to be perpendicular to datum -c-. ?eb? and ?ec? are measured at the lead tips with the loads unconstrained. 6. ?n? is the number of terminal positions. (n=16) 7. pointed or rounded lead tips ar e preferred to ease insertion. 8. ?b2? and ?b3? maximum dimensions are not include dambar protrusions. dambar protrusions shall not exceed 0.010 inch (0.25 mm). 9. distance between leads including dambar protrusions to be 0.005 inch minimum. 10. datum plane -h- coincident with the bo ttom of lead, where lead exits body. 11. refer to jedec ms-001 variation ab. jedec is the trademark of jedec solid state technology association.
tel:886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2256 v1.7 - 16 - august, 2006 electronic volume controller ic pt2256 16pins, sopm, 300mil -b- e h .25 (.010) m b m .25 (.010) m c a m b s a1 a seating plane -c- .10 (.004) -a- d -e- b l h x 45 c n 123 index area symbol min. max a 2.35 2.65 a1 0.10 0.30 b 0.33 0.51 c 0.23 0.32 d 10.10 10.50 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 o 8 o
tel:886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2256 v1.7 - 17 - august, 2006 electronic volume controller ic pt2256 notes: 1. dimensioning and toleranci ng per ansi y14.5m-1982. 2. dimension ?d? does not include mold flash, protru sions or gate burrs. mold flash, protrusion or gate burrs shall not exceed 0.15 mm (0.006 in) per side. 3. dimension ?e? does not include inte rlead 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 terminal for soldering to a substrate. 6. n is the number of the terminal positions (n=16) 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 dimension : millimeter. 9. refer to jedec ms-013, variation aa. jedec is the trademark of jedec solid state technology association.
tel:886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2256 v1.7 - 18 - august, 2006 electronic volume controller ic pt2256 16 pins, sop, 150mil
tel:886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2256 v1.7 - 19 - august, 2006 electronic volume controller ic pt2256
tel:886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2256 v1.7 - 20 - august, 2006 electronic volume controller ic pt2256 symbol min. typ. max. a 1.35 - 1.75 a1 0.10 - 0.25 a2 1.25 - 1.65 b 0.31 - 0.51 b1 0.28 - 0.48 c 0.17 - 0.25 c1 0.17 - 0.23 d 9.90 bsc. e 6.00 bsc. e1 3.90 bsc. e 1.27 bsc. l 0.40 - 1.27 l1 1.04 ref. l2 0.25 bsc. r 0.07 - - r1 0.07 - h 0.25 - 0.50 0 - 8 1 5 - 15 2 0 - - notes: 1. dimensioning and toleranc ing per ansi y 14.5m-1994 2. controlling dimension: millimeters. 3. dimension d does not include mold flash protrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 0.15 mm (0.006 in ) per end. dimension e1 does not include interlead flash or protrusion. interlead flash or protrusion shall not exceed 0.25mm per side. d and e1 dimensions are determined at datum h. 4. the package top may be smaller than t he package bottom. dimensions d and e1 are determined at the outermost extremes of the plastic body exclusive of mold flash, tie bar burrs, gate burrs and interlead flash, but including any mismatch between the top and bottom of the plastic body. 5. datums a & b to be determined at datum h. 6. n is the number of terminal positions. (n=16) 7. the dimensions apply to the flat section of the lead between 0.10 to 0.25mm from the lead tip. 8. dimension ?b? does not include dambar protru sion. allowable dambar protrusion shall be 0.10mm total in excess of the ?b? dimension at maximum material conditi on. the dambar cannot be located on the lower radius of the foot. 9. this chamfer feature is optional. if it is not present, then a pin 1 identif ier must be located within the index area indicated. 10. refer to jedec ms-012, variation ac. jedec is the registered trademark of je dec solid state technology association.
tel:886-2-66296288 fax:886-2-29174598 url:http://www.princeton.com.tw pt2256 v1.7 - 21 - august, 2006 electronic volume controller ic pt2256 revision history date revision # reference # remarks september, 2000 01 pt2256 v1.3 modification #: 000803 approval #: 000902 request #: july, 19, 2004 02 pt2256v1.4 request no.: 040708 approval #: 040705 modification #: 040705 august, 13, 2004 03 pt2256 v1.5 request no.: 040811 approval #: 040806 modification #: 040805 march, 24, 2006 04 pt2256 v1.6 approval #: 060316 modification #: 060315 august, 15, 2006 05 pt2256 v1.7 approval #: 060811 modification #: 060806

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