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Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Electronic Volume Controller IC 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 V2.7 -1- July, 2004 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Electronic Volume Controller IC PT2253A BLOCK DIAGRAM Vcc Vss /INH U/D U/D CK 7 BITS BIDIRECTIONAL SHIFT REGISTER INT 5 BITS BIDIRECTIONAL CK SHIFT REGISTER U/D AUTO INITIALIZE CIRCUIT INT CONSTANT CURRENT CIRCUIT DCO OSC OSC L-OUT1 Vcc R-OUT1 CK 7 BITS LATCH CIRCUIT CK 7 BITS LATCH CIRCUIT A-SW A-SW A-SW A-SW A-SW A-SW A-SW A-GND CK 6 BITS LATCH CIRCUIT CK 6 BITS LATCH CIRCUIT A-SW A-SW A-SW A-SW A-SW A-SW R-OUT2 R-IN2 R-IN1 L-IN1 A-SW A-SW A-SW A-SW A-SW A-SW A-SW CK CK A-GND L-IN2 A-SW A-SW A-SW A-SW A-SW A-SW L-OUT2 CK CK PT2253A V2.7 -2- July, 2004 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Electronic Volume Controller IC PT2253A PIN CONFIGURATION Vss L-OUT1 L-IN1 A-GND L-IN2 LOUT2 /INH DCO 1 2 3 4 5 6 7 8 PT2253A 16 15 14 13 12 11 10 9 Vcc R-OUT1 R-IN1 A-GND R-IN2 R-OUT2 U/D OSC PIN DESCRIPTION Pin Name Vss L-OUT1 L-IN1 A-GND L-IN2 L-OUT2 /INH DCO OSC U/D R-OUT2 R-IN2 A-GND R-IN1 R-OUT1 Vcc PT2253A V2.7 Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 I/O Description Power Negative Power Supply 10dB/Step Attenuator Output O A signal applied to `IN' is attenuated into 7 steps from 0dB to -60dB. I 10dB/Step Attenuator Input GND Analog Ground Pin I 2dB/Step Attenuator Input 2dB/Step Attenuator Output O A signal applied to "IN" is attenuated into 5 steps from 0dB to -8dB. Inhibit Terminal. I At "L" level, all inputs and outputs are disabled. At "H" level, operation is normal. O DC Current Output Pin I/O RC Connecting Pin for the Oscillator I Attenuator Up/Down Control Pin O 2dB/Step Attenuator Output, same as L-OUT2. I 2dB/Step Attenuator Input, same as L-IN2. GND Analog Ground Pin I 10dB/Step Attenuator Input, same as L-IN1. O 10dB/Step Attenuator Output, same as L-OUT1. Power Positive Power Supply -3July, 2004 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://w