Princeton Technology Corp.

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Adela Rodgers
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1 Tel: Fax: 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

2 Tel: Fax: 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 PT53A PT53A v.6 Page Revised October 999

3 Tel: Fax: 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

4 Tel: Fax: 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

5 Tel: Fax: PT53A APPLICATION CIRCUIT 3 Single Power Supply 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

6 Tel: Fax: PT53A APPLICATION CIRCUIT Single Power Supply (6 ~ V) uf - 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

7 Tel: Fax: PT53A ORDER INFORMATION Valid Part Number PT53A Package Type 6 Pins, DIP PT53A v.6 Page 7 Revised October 999

Princeton Technology Corp.

Princeton Technology Corp. DESCRIPTION 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