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| Princeton Technology Corp. Electronic Volume Controller IC Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2256 DESCRIPTION PT2256 is an electronic volume controller IC utilizing CMOS Technology specially designed for use on audio equipment. It has 2 built-in channels making it ideally suitable for mono and stereo sound applications. PT2256 provides the Loudness Function, a wide frequency response range and a very low total harmonic distortion, thereby guaranteeing a highly effective and reliable performance. It is housed in 16-pin DIP or SO package and is functionally compatible with TC9235P. Pin assignments and application circuit are optimized for low cost advantages and easy PCB Layout. FEATURES * * * * * * * * * * CMOS Technology Low Power Consumption Least External Components 2 Channels in the same chip 0 dB to -78 dB Attenuation can be controlled by UP and Down Pin. 20dB Tap for Loudness Circuit Built-in DC Output Circuit (8 levels) for Volume Level Metering Wide Frequency Response Range Low Total Harmonic Distortion Available in 16 pins DIP or SO Package APPLICATION * Audio Equipment Volume Control PT2256 v1.3 1 Updated Sept. 2000 Princeton Technology Corp. Electronic Volume Controller IC Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2256 PIN CONFIGURATION VSS OUT1 IN 1 LT 1 AGND UP DN OSC 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VDD OUT2 IN 2 LT 2 AGND DCO IN H RST PT2256 ORDER INFORMATION V lid Part N umber a PT2256 PT2256- S Package 16 Pins, DIP (300 mil) 16 Pins, SO (300 mil) PT2256 v1.3 2 Updated Sept. 2000 Princeton Technology Corp. Electronic Volume Controller IC Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2256 APPLICATION CIRCUIT Single Power Supply (No Loudness and No Backup Circuit) L-C h O utput L-C h Input 100 R -C h O utput R -C h Input Rx Cx Note: Modifying the values of Rx and Cx affects the Oscillator Frequency of the IC. If the Fosc value is big, then the volume control change is fast. Likewise, if the Fosc value is small, the volume control change is slow. It is suggested that Rx= 33K, Cx = 2.2uF. The table for the Rx, Cx and Fosc values are given below. Rx 33K 33K 33K Cx 1.0uF 2.2uF 10uF Fosc 34.1Hz 17.8Hz 3.4Hz Rx 33K 51K 100K Cx 1.0uF 1.0uF 1.0uF Fosc 34.1Hz 22.7Hz 11.8Hz PT2256 v1.3 3 Updated Sept. 2000 Princeton Technology Corp. Electronic Volume Controller IC Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2256 APPLICATION CIRCUIT (Including Loudness but No Backup Circuit) L-C h O utput L-C h Input 8.2nF 820 O hm s 820 O hm s 820 O hm s 820 O hm s 8.2nF 820 O hm s R -Ch O utput R -Ch Input 100 Rx Cx Note: Modifying the values of Rx and Cx affects the Oscillator Frequency of the IC. If the Fosc value is big, then the volume control change is fast. Likewise, if the Fosc value is small, the volume control change is slow. It is suggested that Rx= 33K, Cx = 2.2uF. The table for the Rx, Cx and Fosc values are given below. Rx 33K 33K 33K Cx 1.0uF 2.2uF 10uF Fosc 34.1Hz 17.8Hz 3.4Hz Rx 33K 51K 100K Cx 1.0uF 1.0uF 1.0uF Fosc 34.1Hz 22.7Hz 11.8Hz PT2256 v1.3 4 Updated Sept. 2000 |
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