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| Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw RDS Demodulator IC PT2579 DESCRIPTION PT2579 is a Radio Data System Demodulator IC utilizing CMOS Technology specially designed for radio data system applications. The RDS data signal (RDDA) and the RDS clock signal (RDCL) are provided as outputs for further processing by an ideal decoder / microcontroller. Anti-aliasing Filter (2nd order), 57kHz band pass filter (8th order), reconstruction filter (2nd order), clocked comparator with automatic offset compensation, biphase symbol decoder, differential decoder, and signal quality detector are all built into a single chip having the highest performance and reliability. Pin assignments and application circuit are optimized for easy PCB layout and cost saving advantages. FEATURES CMOS Technology Low Power Consumption Anti-Aliasing Filter (2nd Order) Reconstruction Filter (2nd Order) 57kHz Band-Pass Filet (8th Order) 57kHz Carrier Regeneration Differential Decoder Signal Quality Detector Subcarrier Output Selectable 4.332 / 8.664 MHz Crystal Oscillator with Variable Dividers Synchronous Demodulator for 57kHz Modulated RDS Signals Clocked Comparator with Automatic Offset Compensation Clock Generation with Lock on Biphase Data Rate Biphase Symbol Decoder with Integrate and Dump Functions Available in 16 pins, DIP or SOP Package APPLICATIONS Car Radio Home Stereo Tuner PT2579 v1.3 -1- April. 2004 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw RDS Demodulator IC PT2579 Pin Configuration PT2579 v1.3 -2- April. 2004 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw RDS Demodulator IC PT2579 APPLICATION CIRCUIT 1 QUAL RDDA VREF AVDD AVSS CIN SCOUT RDCL T57 OSC2 DVDD DVSS TEST MODE 16 15 14 13 12 11 10 9 MUX SIGNAL 2.2uF + 330pF +5V 0.1uF 560pF 2 3 4 5 6 7 8 2.2k 4.332/8.664MHz 82pF +5V 0.1uF 47pF MUXL PT2579 OSC1 Notes: 1. Two crystal frequencies may be used via the MODE pin. Please refer to the table below. 2. For the 4.332MHz Crystal, it is recommended to use TXC 6A04300098 or a component with the same specifications. MODE Pin State LOW HIGH Crystal Clock Frequency (MHz) 4.332 8.664 PT2579 v1.3 -3- April. 2004 Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw RDS Demodulator IC PT2579 ORDERING INFORMATION Order Part Number PT2579 PT2579-S PT2579-SN PT2579 (L) PT2579-S (L) PT2579-SN (L) Package 16 pins, DI Package, 300mil 16 pins, SO Package, 300mil 16 pins, SO Package, 150mil 16 pins, DI Package, 300mil 16 pins, SO Package, 300mil 16 pins, SO Package, 150mil Top Code PT2579 PT2579-S PT2579-SN PT2579 PT2579-S PT2579-SN Notes: 1. (L) = Lead Free 2. The Lead Free mark is put in front of the date code. PT2579 v1.3 -4- April. 2004 |
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