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tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw PT2253A v2.8 - 1 - december, 2005 electronic volume controller ic PT2253A description PT2253A is an electronic volume controller ic util izing cmos technology specially designed for use on audio equipments. it has two (2) built-in channels making it ideally suitable for mono and stereo sound applications. PT2253A provides a wide frequency response range and a very low harmonic distortion to mention a few; thereby guaranteei ng a highly effective and reliable performance. features ? cmos technology ? low power consumption ? operating voltage range: vcc=6 ~ 12v (backup voltage is up to 4v) ? 0db to -68db attenuation controlled by 2db/step ? 2 channels in each chip ? capable to control attenuation by a built-in oscillator and up/down pin ? single power supply or dual power supplies of (+) and (-) can be used ? wide frequency response range ? very low harmonic distortion ? available in 16 pin, dip package applications ? audio equipment volume control ? traditional vr replacement
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw PT2253A v2.8 - 2 - december, 2005 electronic volume controller ic PT2253A block diagram 7 bits bidirectional shift register u/d ck u/d ck int int 5 bits bidirectional shift register auto initialize circuit constant current circuit u/d vcc vss / in h dco osc osc ck ck ck ck 7 bits latch circuit 7 bits latch circuit a-sw a-sw a-sw a-sw a-sw a-sw a-sw a-sw a-sw a-sw a-sw a-sw a-sw a-sw a-sw a-sw a-sw a-sw a-sw a-sw a-sw a-sw a-sw a-sw a-sw a-sw r-out1 r-in1 a-gnd 6 bits latch circuit 6 bits latch circuit ck ck ck ck r-in2 r-out2 vcc l-out1 l-in1 a-gnd l-in2 l-out2
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw PT2253A v2.8 - 3 - december, 2005 electronic volume controller ic PT2253A pin configuration vss l-out1 l-in1 vcc osc r-out1 r-in1 lout2 r-out2 /inh a-gnd a-gnd u/d l-in2 r-in2 1 16 2 15 3 14 413 89 710 6 11 5 12 pt22 53 a dco pin description pin name i/o description pin no. vss power negative power supply 1 l-out1 o 10db/step attenuator output a signal applied to ?in? is attenuated into 7 steps from 0db to -60db. 2 l-in1 i 10db/step attenuator input 3 a-gnd gnd analog ground pin 4 l-in2 i 2db/step attenuator input 5 l-out2 o 2db/step attenuator output a signal applied to ?in? is attenuated into 5 steps from 0db to -8db. 6 /inh i inhibit terminal. at ?l? level, all inputs and outputs are disabled. at ?h? level, operation is normal. 7 dco o dc current output pin 8 osc i/o rc connecting pin for the oscillator 9 u/d i attenuator up/down control pin 10 r-out2 o 2db/step attenuator output, same as l-out2. 11 r-in2 i 2db/step attenuator input, same as l-in2. 12 a-gnd gnd analog ground pin 13 r-in1 i 10db/step attenuator input, same as l-in1. 14 r-out1 o 10db/step attenuator output, same as l-out1. 15 vcc power positive power supply 16
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw PT2253A v2.8 - 4 - december, 2005 electronic volume controller ic PT2253A function description attenuation setting the attenuation can be increased or decreased depending on the state of t he u/d pin (either ?h? or ?l? level) by actuating the built-in osc illator. when power is applied, the a ttenuation is automatically set at -40db. power supply u/d osc -30db -32db -34db -36db -38db -40db when the down key is pressed, t he u/d pin goes to the ?l? level and the oscillator is actuated in the down state. thus, attenuation is increased. conversely, when the up key is pressed, the u/ d pin goes to the ?h? level and the oscillator is actuated in the up state. t hus, attenuation is decreased. oscillation frequency (fosc) is dependent on the cx and the rx and is determined by the following equation: hz (cx)(rx) 0.7 1 fosc = where: rs 3rx
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw PT2253A v2.8 - 5 - december, 2005 electronic volume controller ic PT2253A rs cx v cc osc vcc osc up down v ss 1f rx=33k cx=4.7 f rs=100k ? ? rx u/d +
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw PT2253A v2.8 - 6 - december, 2005 electronic volume controller ic PT2253A attenuation display output PT2253A has a dc current output pin (dco). the output level is divided into 13 steps. please refer to the table below: step dco attenuation 0 0 -64db ~ 1 i -60db ~ -62db 2 2i -54db ~ -58db 3 3i -50db ~ -52db 4 4i -44db ~ -48db 5 5i -40db ~ -42db 6 6i -34db ~ -38db 7 7i -30db ~ -32db 8 8i -24db ~ -28db 9 9i -20db ~ -22db 10 10i -14db ~ -18db 11 11i -10db ~ -12db 12 12i -4db ~ - 8db 13 13i 0db ~ -2db current value may fluctuate depending on the ic. w hen high precision is required, use a variable resistor as a load resistor. 13 12 11 10 9 8 7 6 5 4 3 2 1 s tep 0 a bout 100mv 30mv + a bout 1.3 v 8 1k vss vss
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw PT2253A v2.8 - 7 - december, 2005 electronic volume controller ic PT2253A attenuator attenuator 1 attenuates 0 ~ -60db at 10db/step. attenuator 2 attenuates 0 ~ -8db at 2db/step. -60 -50 -40 -30 -20 -10 attenuator 1 0db in1 out1 ratt-1 in2 buffer amp 0 -2 -4 -6 -8 out2 attenuator 2 a-gnd ratt-1=50k ? (typ.) ratt-2=20k (typ.) ? ratt-2 if there is the possibility of excessive voltage in the attenuator, it is recommended that a protective diode be inserted. please refer to the diagram below. vcc v ss in vcc vss
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw PT2253A v2.8 - 8 - december, 2005 electronic volume controller ic PT2253A power supply dual power supply a-gnd vcc u/d osc dco /inh vss vcc dc up down osc +vcc 0v -vss u/d single power supply a-gnd vcc u/d osc dco /inh vss vcc dc +vcc 1/2 vdd (a-gnd) 0v (vss) +
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw PT2253A v2.8 - 9 - december, 2005 electronic volume controller ic PT2253A initialization when power on PT2253A has the built-in auto-initializing function fo r during the power on period. it has the power supply on reset for the initialization of the chip. if t he power supply rises too fast, the initialization may not be fully effected. for initialization to be fully e ffective, it is necessary to satisfy the following conditions: 1. the /inh terminal must be raised simultaneously with the supply voltage. 2. initial attenuation level is -40db please refer to the following diagram. vcc-vss = 4.0 v t 1 msec > t vcc-vss or /inh terminal voltage note: if vcc-vss drops below 4.0v, the auto-initializing func tion is actuated. back up when power off when /inh pin is set at ?l? level, all input and output pins are disabl ed and the current consumption is reduced to the minimum. under this condition, the backup by means of a capacitor becomes possible. an example of this application when a backup capacitor is used is shown below. PT2253A vdd vcc 10k 1000 16v 10k vcc vss /inh 51k -vss + - if vcc-vss drops below 4v, the backup becomes impossible.
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw PT2253A v2.8 - 10 - december, 2005 electronic volume controller ic PT2253A absolute maximum ratings parameter symbol ratings unit operating temperatur e topr -45 ~ +85 storage temperature tstg -65 ~ +150 dc electrical characteristics (unless otherwise specified, vcc=12v, vss=0v and ta=25 ) parameter symbol conditions min. typ. max. unit operating supply voltage vcc 6 - 12 v operating supply current icc - 1 3 ma stand-by-current isb vcc=12v /inh=0v osc=12v - - 10 a input voltage ?h? level vih 0.8 x vcc - vcc + 0.3 (/inh, u/d) ?l? level vil vss - 0.3 - 0.2 x vcc v attenuator 1 (10db/step) resistor ratt-1 attenuation level is set to 0db 25 50 70 k ? attenuator 2 (2db/step) resistor ratt-2 attenuation level is set to 0db 10 20 28 k ? max. input amplitude vin bias vcc/2=6v fin=1khz att=0db - - 4.0 vrms operating oscillation frequency fosc 5 - 10 khz dco output current idco 1 step 70 100 140 a
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw PT2253A v2.8 - 11 - december, 2005 electronic volume controller ic PT2253A electrical characteristics (unless otherwise specified, vcc=6v, vss=-6v, gnd=0v) in1 ~ out 1 parameter symbol condition max. unit signal to noise ratio s/n att=0db fin=1khz vin=1.0vrms 97 db frequency response fr att=-10db fin=1khz vin=1.0vp-p 657 khz noise floor nf vin=0v, att=0db 0.015 mv total harmonic distortion thd att=-10db fin=1khz vin=1.0vrms 0.010 % in2 ~ out2 parameter symbol condition max. unit signal to noise ratio s/n att = 0db fin=1khz vin=1.0vrms 95 db frequency response fr att=-2db fin=1khz vin=1.0vp-p 1820 khz noise floor nf vin=0v att=0db 0.022 mv total harmonic distortion thd att=-2db fin=1khz vin=1.0vrms 0.009 %
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw PT2253A v2.8 - 12 - december, 2005 electronic volume controller ic PT2253A application circuit 1 dual power supply (l-channel only) vss l-out1 l-in1 a-gnd l-in2 l-out2 /inh dco vcc r-out1 r-in1 a-gnd r-in2 r-out2 u/d osc PT2253A 10 f + 10 f + + cx 4.7 rs 100k rx 33k 1n4148 + 1f 1n4148 down sw up sw input ground output lm358 + _ 10 f vss -6v 10k 10 f vdd +6v 3 4 2 8 1 rs 3rx + + fosc = 1 (0.7) (cx)( rx)
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw PT2253A v2.8 - 13 - december, 2005 electronic volume controller ic PT2253A application circuit 2 dual power supply (l-channel only) vss l-out1 l-in1 a-gnd l-in2 l-out2 /inh dco vcc r-out1 r-in1 a-gnd r-in2 r-out2 u/d osc PT2253A 10 f + 10 f + cx 4.7 rs 100k rx 33k 1n4148 1f 1n4148 down sw up sw input ground output lm358 10 f vss -6v 10k 10 f vdd +6v 3 4 0.15 f 51k 68pf 110k 2 8 1 fosc = + + rs 3rx (0.7)(cx)( rx) 1 + + + _ note: since the buffer amp between att-1 and att-2 is al ready 10db voltage gain, higher input level may cause op amp?s output clipping. to avoid unwanted di stortion, the input signal level applied at in-1 should not be over 1vrms.
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw PT2253A v2.8 - 14 - december, 2005 electronic volume controller ic PT2253A application circuit 3 single power supply 10 f 10 f 10 f 10 f + + + + input (left channel) c1 c2 c3 c4 output (left channel) vcc + 100 f 10k 10k vcc vcc (6 ~ 12v ) 0.1 f input (right channel ) output (right channel ) 1 2 in4148 in4148 33k 2 2 2 2 1 2 1f + vcc + 4.7 f 100k up key - - + + 4 4 2 6 3 5 1 7 lm358 lm358 8 8 vss l-out1 l-in1 a-gnd l-in2 l-out2 /inh dco vcc r-out1 r-in1 a-gnd r-in2 r-out2 u/d osc PT2253A
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw PT2253A v2.8 - 15 - december, 2005 electronic volume controller ic PT2253A application circuit 4 single power supply - + 4 2 6 5 1 7 68pf 110k lm358 0.15 f 51k - + 4 3 68pf 110k lm358 0.15 f 51k 8 8 10 f 10 f 10 f 10 f + + + + input (left channel) c1 c2 c3 c4 output (left channel) vcc + 100 f 10k 10k vcc vcc (6 ~ 12v ) 0.1 f input (right channel) output (right channel ) 1 2 in4148 in4148 33k 2 2 2 2 1 2 1f + vcc + 4.7 f 100k up key vss l-out1 l-in1 a-gnd l-in2 l-out2 /inh dco vcc r-out1 r-in1 a-gnd r-in2 r-out2 u/d osc PT2253A note: since the buffer amp between att-1 and att-2 is al ready 10db voltage gain, higher input level may cause op amp?s output clipping. to avoid unwanted di stortion, the input signal level applied at in-1 should not be over 1vrms.
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw PT2253A v2.8 - 16 - december, 2005 electronic volume controller ic PT2253A order information valid part number package type top code PT2253A 16 pins, dip, 300mil PT2253A PT2253A-s 16 pins, sop, 300mil PT2253A-s PT2253A (l) 16 pins, dip, 300mil PT2253A PT2253A-s (l) 16 pins, sop, 300mil PT2253A-s 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 PT2253A v2.8 - 17 - december, 2005 electronic volume controller ic PT2253A package information 16 pins, dip, 300mil
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw PT2253A v2.8 - 18 - december, 2005 electronic volume controller ic PT2253A 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. controlling dimension: inches. 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, 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 cons trained to be perpendicular to datum -c-. 6. eb and ea are measured at the l ead tips with the leads unconstrained. 7. n is the maximum number of terminal positions (n=16). 8. pointed or rounded lead tips ar e preferred to ease insertion. 9. b2 and b3 maximum dimensions do not include dambar protrusions. dambar protrusions shall not exceed 0.010 (0.25mm). 10. variation ab is a full lead package. 11. distance between leads including dambar protrusions to be 0.005 in minimum. 12. datum plane -h- coincident with t he bottom of lead where lead exits body. 13. refer to jedec ms-001 variation ab. jedec is the registered trademark of jede c solid state technology association.
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw PT2253A v2.8 - 19 - december, 2005 electronic volume controller ic PT2253A 16 pins, sop, 300mil 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 PT2253A v2.8 - 20 - december, 2005 electronic volume controller ic PT2253A notes: 1. controlling dimension: millimeter 2. dimensioning and toleranc ing per ansi y14.5m-1982. 3. dimension d does not include mold flash, protrusi ons or gate burrs. mold fl ash, protrusions and gate burrs shall not exceed 0.15mm (0.006 in) per side. 4. dimension e does not include inte rlead flash or protrusions. interlead flash and protrusions shall not exceed 0.25 mm (0.010 in.) per side. 5. the chamfer on the body is optional. if it is not pr esent, a visual index feature must be located within the crosshatched area. 6. l is the length of the terminal for soldering to a substrate. 7. n is the number of terminal positions (n=16). 8. the lead width b, as measured 0.36 mm (0.014in) or greater above the seating plane, shall not exceed a maximum value of 0.61mm (0.024in.) 9. refer to jedec ms-013 variation aa. jedec is the registered trademark of jede c solid state technology association.

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