princeton technology corp . tel: 886-2-29162151 fax: 886-2-29174598 url: http://www.princeton.com.tw electronic volume controller ic PT2253A PT2253A v 2.6 page 1 revised october 1999 description PT2253A is an electronic volume controller ic utilizing 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 guaranteeing a highly effective and reliable performance. features ! cmos technology ! low power consumption ! operating voltage range : vcc = 6 ~ 12 v (backup voltage is up to 4 v) ! 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
princeton technology corp . tel: 886-2-29162151 fax: 886-2-29174598 url: http://www.princeton.com.tw electronic volume controller ic PT2253A PT2253A v 2.6 page 2 revised october 1999 pin configuration 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 vss l-out1 l-in1 a-gnd l-in2 l-out2 in h dco vcc r-out1 r-in1 a-gnd r-in2 r-out2 u/d osc PT2253A order information valid part number package type PT2253A 16 pins, dip
princeton technology corp . tel: 886-2-29162151 fax: 886-2-29174598 url: http://www.princeton.com.tw electronic volume controller ic PT2253A PT2253A v 2.6 page 3 revised october 1999 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 10uf + 10uf + + 4.7 cx 100k rs 33k rx 1n4148 + 1uf 1n4148 down sw up sw input ground output lm358 + _ 10uf vss -6v 10k 10uf vdd +6v 3 4 2 8 1 fosc = 1 (0.7)(cx)( rx) rs 3rx + +
princeton technology corp . tel: 886-2-29162151 fax: 886-2-29174598 url: http://www.princeton.com.tw electronic volume controller ic PT2253A PT2253A v 2.6 page 4 revised october 1999 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 10uf + 10uf + 4.7 cx 100k rs 33k rx 1n4148 1uf 1n4148 down sw up sw input ground output lm358 10uf vss -6v 10k 10uf vdd +6v 3 4 0.15uf 51k 68pf 110k 2 8 1 fosc = 1 (0.7)(cx)( rx) rs 3rx + + note: since the buffer amp between att-1 and att-2 is already 10db voltage gain, higher input level may cause op amp?s output clipping. to avoid unwanted distortion, the input signal level applied at in-1 should not be over 1 vrms.
princeton technology corp . tel: 886-2-29162151 fax: 886-2-29174598 url: http://www.princeton.com.tw electronic volume controller ic PT2253A PT2253A v 2.6 page 5 revised october 1999 application circuit 3 single power supply vss l-out1 l-in1 a-gnd l-in2 l-out2 in h dco vcc r-out1 r-in1 a-gnd r-in2 r-out2 u/d osc 10uf 10uf 10uf 10uf + + + + - - + + 4 4 2 6 3 5 1 7 lm 358 lm 358 8 8 input (left channel) c1 c2 c3 c4 output (left channel) vcc + 100uf 10k 10k vcc PT2253A vcc (6 ~ 12v) 0.1uf input (right channel) o utput (righ t c h annel) 1 2 in4148 in4148 33k 2 2 2 2 1 2 1uf + vcc + 4.7uf 100k up key
princeton technology corp . tel: 886-2-29162151 fax: 886-2-29174598 url: http://www.princeton.com.tw electronic volume controller ic PT2253A PT2253A v 2.6 page 6 revised october 1999 application circuit 4 single power supply 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 10uf 10uf 10uf 10uf + + + + - - + + 4 4 2 6 3 5 1 7 68pf 68pf 110k 110k lm 358 lm358 0.15uf 0.15uf 51k 51k 8 8 input (left channel) c1 c2 c3 c4 output (left ch annel) vcc + 100uf 10k 10k vcc PT2253A vcc (6 ~ 12v) 0.1uf input (right channel) output (right c hannel) 1 2 in4148 in4148 33k 2 2 2 2 1 1uf + vcc + 4.7uf 100k up key note: since the buffer amp between att-1 and att-2 is already 10db voltage gain, higher input level may cause op amp?s output clipping. to avoid unwanted distortion, the input signal level applied at in-1 should not be over 1 vrms.
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