Princeton Technology Corp. Electronic Volume Controller IC Tel: 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2253A 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 PT2253A v 2.6 Page 1 Revised October 1999 Princeton Technology Corp. Tel: 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Electronic Volume Controller IC PT2253A PIN CONFIGURATION V ss 1 16 V cc L -O U T 1 2 15 R -O U T 1 L -IN 1 3 14 R -IN 1 A -G N D 4 13 A -G N D L -IN 2 5 12 R -IN 2 L -O U T 2 6 11 R -O U T 2 IN H 7 10 U /D DCO 8 9 OSC P T 2 2 53 A ORDER INFORMATION Valid Part Number PT2253A PT2253A v 2.6 Package Type 16 Pins, DIP Page 2 Revised October 1999 Tel: 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Princeton Technology Corp. Electronic Volume Controller IC PT2253A APPLICATION CIRCUIT 1 Dual Power Supply (L-Channel Only) Vss -6V + 4 1 LM358 _ 8 2 3 10uF VDD + +6V 10uF + V ss 10uF + INPUT GROUND L -IN 1 A -G N D 10uF L -IN 2 + OUTPUT Vcc L -O U T 1 R -O U T 1 R -IN 1 A -G N D R -IN 2 L -O U T 2 R -O U T 2 IN H U /D DCO OSC + CX 4.7 P T 2 253A 10K + 1N4148 100K RS fosc = RS 1 (0.7)(CX)( RX) Page 3 33K RX 1N4148 3RX UP SW PT2253A v 2.6 1uF DOWN SW Revised October 1999 Princeton Technology Corp. Tel: 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Electronic Volume Controller IC PT2253A APPLICATION CIRCUIT 2 Dual Power Supply (L-Channel Only) Vss -6V 4 3 10uF LM358 + 1 8 2 68pF VDD +6V 10uF 0.15uF + 51K V ss L -O U T 1 R -O U T 1 10uF + INPUT GROUND L -IN 1 A -G N D L -IN 2 + 10uF OUTPUT 110K V cc R -IN 1 A -G N D R -IN 2 L -O U T 2 R -O U T 2 IN H U /D D CO O SC CX 4.7 PT2253A 10K 1N4148 100K RS fosc = RS 1 (0.7)(CX)( RX) 1uF 33K RX 1N4148 3RX UP SW DOWN SW 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. PT2253A v 2.6 Page 4 Revised October 1999 Page 5 V cc O u tp u t (L e ft C h a n n e l) In p u t (L e ft C h a n n e l) 10K 10 K V cc 2 8 1 + - L M 358 4 + 100uf C3 C1 10u f + 10u f + Vcc R -IN 2 OSC DCO P T 22 53 A U /D IN H R -O U T 2 L -IN 2 L -O U T 2 A -G N D R -IN 1 R -O U T 1 A-GN D L -IN 1 L -O U T 1 V ss V cc 10uf U p K ey 10uf C4 4 .7 u f 100K + C2 0.1 u f + PT2253A v 2.6 + 3 2 2 IN414 8 1 2 33K 2 1 2 2 IN 4 1 4 8 6 5 + 1uf 8 7 + - LM 358 4 V c c (6 ~ 1 2 V ) O u tp u t (R ig h t C h an n e l) In p u t (R ig h t C h a n n el) Princeton Technology Corp. Tel: 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Electronic Volume Controller IC PT2253A APPLICATION CIRCUIT 3 Single Power Supply Revised October 1999 Tel: 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Princeton Technology Corp. Electronic Volume Controller IC PT2253A APPLICATION CIRCUIT 4 1 uf + 6 8p F 2 2 2 2 2 1 U p K ey 1 00 K + 4.7uf C4 V cc OSC D CO 10 K V cc O utp ut (L e ft C h ann el) Inp ut (L eft C han nel) 5 1K 10 K V cc 68 pF 2 0.1 5u f 3 8 1 + - L M 3 58 4 110K + 100 uf C3 + PT 2 253A U /D IN H R -IN 2 R -O U T 2 L -O U T 2 L -IN 2 10u f R -IN 1 A -G N D A -G N D L -IN 1 10u f C1 + V ss L -O U T 1 R -O U T 1 V cc 1 0u f + 0 .1u f + C2 1 0uf 33K IN 41 48 1 0.1 5uf 51 K IN 4 148 6 5 8 7 + - L M 358 4 110 K V c c (6 ~ 12V ) O u tpu t (R ig ht C han ne l) In put (R ight C ha nnel) Single Power Supply 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. PT2253A v 2.6 Page 6 Revised October 1999