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