PT2254A PTC | Alldatasheet

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Princeton Technology Corp. Tel : 886-2-29162151 Fax : 886-2-29174598 URL: http://www.princeton.com.tw Electronic Volume Controller IC PT2254A PT2254A v 2.4 Page 1 Revised A ugust 1998

DESCRIPTION

PT2254A is an electronic volume controller IC utilizing CMOS Technology specially designed for use on audio equipment. It has two built-in channels making it highly suitable for mono and stereo sound applications. Through the specially designated signals that are applied externally to the data, clock and strobe input pins, PT2254A can control attenuation and channel balance.

FEATURES

! CMOS Technology ! Low Power Consumption ! High Operating Voltage Range : Vcc = 4 ~ 12 V ! 0dB to -68dB attenuation controlled by 2dB/step ! 2 Channels in each chip ! Single Power Supply or Dual Power Supplies of (+) and (-) can be used ! Attenuation can be controlled by signals attached to the Strobe, Data and Clock Pins. ! Available in 16 Pins, DIP & SO Package

APPLICATIONS

! Audio Equipment Volume Control ! Multi-Media PC Audio Control

Princeton Technology Corp. Tel : 886-2-29162151 Fax : 886-2-29174598 URL: http://www.princeton.com.tw Electronic Volume Controller IC PT2254A PT2254A v 2.4 Page 2 Revised A ugust 1998 PIN CONFIGURATION

Princeton Technology Corp. Tel : 886-2-29162151 Fax : 886-2-29174598 URL: http://www.princeton.com.tw Electronic Volume Controller IC PT2254A PT2254A v 2.4 Page 3 Revised A ugust 1998 APPLICATION CIRCUIT 1 Dual Power Supply (Only One Channel for Reference) Vss L-OUT1 L-IN1 A-GND L-IN2 L-OUT2 ST GND Vcc R-OUT1 R-IN1 A-GND R-IN2 R-OUT2 DATA CK PT2254A ST OUTPUT 10 F 10 F 10 F A-GND INPUT CK DATA 10 F LM358 VDD +6V Vss -6V

Princeton Technology Corp. Tel : 886-2-29162151 Fax : 886-2-29174598 URL: http://www.princeton.com.tw Electronic Volume Controller IC PT2254A PT2254A v 2.4 Page 4 Revised A ugust 1998 APPLICATION CIRCUIT 2 Dual Power Supply (Only One Channel for Reference) Vss L-OUT1 L-IN1 A-GND L-IN2 L-OUT2 ST GND Vcc R-OUT1 R-IN1 A-GND R-IN2 R-OUT2 DATA CK PT2254A ST OUTPUT 10 F 10 F 10 F 0.15uF A-GND INPUT CK DATA 10 F 51 K LM358 VDD +6V Vss -6V 110 K 68 pF Note: The OP and R,C components form a bandpass filter. Its fL(Low Frequency at –3dB point) is about 20 Hz, fH (High Frequency at –3dB point) is about 22 KHz and the flat gain (A0) is 3.15. Therefore, there is a limitation on the input voltage source: (i) The amplitude should not be more than 1 Vrms, (ii) The bandwidth of input should be within the range of 20 to 22 K; otherwise too much distortion will be generated.

Princeton Technology Corp. Tel : 886-2-29162151 Fax : 886-2-29174598 URL: http://www.princeton.com.tw Electronic Volume Controller IC PT2254A PT2254A v 2.4 Page 5 Revised A ugust 1998 APPLICATION CIRCUIT 3 Single Power Supply Vss L-OUT1 L-IN1 A-GND L-IN2 L-OUT2 ST GND Vcc R-OUT1 R-IN1 A-GND R-IN2 R-OUT2 DATA CK PT2254A ST OUTPUT

10 F10K

Vcc (4 ~ 12 V) INPUT CK DATA LM358

Princeton Technology Corp. Tel : 886-2-29162151 Fax : 886-2-29174598 URL: http://www.princeton.com.tw Electronic Volume Controller IC PT2254A PT2254A v 2.4 Page 6 Revised A ugust 1998 APPLICATION CIRCUIT 4 Single Power Supply Vss L-OUT1 L-IN1 A-GND L-IN2 L-OUT2 ST GND Vcc R-OUT1 R-IN1 A-GND R-IN2 R-OUT2 DATA CK PT2254A ST OUTPUT Vcc (4 ~ 12 V) 0.15uF INPUT CK DATA 51 K LM358 110 K 68 pF Note: The OP and R,C components form a bandpass filter. Its fL(Low Frequency at –3dB point) is about 20 Hz, fH (High Frequency at –3dB point) is about 22 KHz and the flat gain (A0) is 3.15. Therefore, there is a limitation on the input voltage source: (i) The amplitude should not be more than 1 Vrms, (ii) The bandwidth of input should be within the range of 20 to 22 K; otherwise too much distortion will be generated.

Princeton Technology Corp. Tel : 886-2-29162151 Fax : 886-2-29174598 URL: http://www.princeton.com.tw Electronic Volume Controller IC PT2254A PT2254A v 2.4 Page 7 Revised A ugust 1998 ORDER INFORMATION Valid Part Number Package Type PT2254A 16 Pins, DIP PT2254AS 16 Pins, SOP