Tel: 886--965 Fax: 886--97598 PT53A DESCRIPTION PT53A is an electronic volume controller IC utilizing CMOS Technology specially designed for use on audio equipments. It has two () built-in channels making it ideally suitable for mono and stereo sound applications. PT53A 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 : = 6 ~ V (Backup Voltage is up to V) 0dB to -68dB attenuation controlled by db/step 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 6 pin, DIP Package APPLICATIONS Audio Equipment Volume Control Traditional VR Replacement PT53A v.6 Page Revised October 999
Tel: 886--965 Fax: 886--97598 PT53A BLO DIAGRAM 7 BITS BIDIRECTIONAL SHIFT REGISTER INT 5 BITS BIDIRECTIONAL SHIFT REGISTER AUTO INITIALIZE CIRCUIT L-OUT INT CONSTANT CURRENT CIRCUIT R-OUT L-IN 7 BITS LATCH CIRCUIT 7 BITS LATCH CIRCUIT R-IN L-IN L-OUT 6 BITS LATCH CIRCUIT 6 BITS LATCH CIRCUIT R-IN R-OUT PIN CONFIGURATION 6 L-OUT 5 R-OUT L-IN 3 R-IN 3 L-IN 5 R-IN L-OUT 6 R-OUT 7 0 8 9 PT53A PT53A v.6 Page Revised October 999
Tel: 886--965 Fax: 886--97598 PT53A APPLICATION CIRCUIT Dual Power Supply (L-Channel Only) -6V 3 _ 8 VDD 6V L-OUT R-OUT INPUT GROUND OUTPUT L-IN L-IN L-OUT R-IN R-IN R-OUT PT53A CX.7 00K RS N8 uf fosc = (0.7)(CX)( RX) RX RS 3RX UP N8 DOWN PT53A v.6 Page 3 Revised October 999
Tel: 886--965 Fax: 886--97598 PT53A APPLICATION CIRCUIT Dual Power Supply (L-Channel Only) -6V 3 8 VDD 6V 0.5uF 68pF 5K L-OUT R-OUT INPUT GROUND OUTPUT L-IN L-IN L-OUT R-IN R-IN R-OUT PT53A CX.7 00K RS N8 uf fosc = (0.7)(CX)( RX) RX RS 3RX N8 UP DOWN Note: Since the Buffer Amp between Att- and Att- is already 0dB Voltage Gain, higher input level may cause OP Amp s Clipping. To avoid unwanted distortion, the input signal level applied at IN- should not be over Vrms. PT53A v.6 Page Revised October 999
Tel: 886--965 Fax: 886--97598 PT53A APPLICATION CIRCUIT 3 Single Power Supply 3 8 5 8 7-6 - 0.uf L-OUT R-OUT 0uf L-IN R-IN 0uf (Left Channel) C C L-IN R-IN (Left Channel) 0uf L-OUT R-OUT 0uf C3 C.7uf 00uf PT53A 00K Up Key IN8 IN8 uf (6 ~ V) PT53A v.6 Page 5 Revised October 999
Tel: 886--965 Fax: 886--97598 PT53A APPLICATION CIRCUIT Single Power Supply (6 ~ V) 8 3 8 5 6 7 0.5uf - 0.uf - 0.5uf 5K 5K 68pF 68pF L-OUT R-OUT 0uf L-IN R-IN 0uf (Left Channel) C C (Left Channel) L-IN R-IN 0uf L-OUT R-OUT 0uf C3 C.7uf 00uf PT53A 00K Up Key IN8 IN8 uf Note: Since the Buffer Amp between Att- and Att- is already 0dB Voltage Gain, higher input level may cause OP Amp s Clipping. To avoid unwanted distortion, the input signal level applied at IN- should not be over Vrms. PT53A v.6 Page 6 Revised October 999
Tel: 886--965 Fax: 886--97598 PT53A ORDER INFORMATION Valid Part Number PT53A Package Type 6 Pins, DIP PT53A v.6 Page 7 Revised October 999