tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2579 v1.3 - 1 - april. 2004 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), reconstr uction 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 t he 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
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2579 v1.3 - 2 - april. 2004 rds demodulator ic pt2579 pin configuration
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2579 v1.3 - 3 - april. 2004 rds demodulator ic pt2579 application circuit qual rdcl rdda t57 vref osc2 muxl osc1 avdd dvdd avss dvss cin test scout mode 560pf +5v 0.1uf 2.2uf 330pf mux signal 2.2k ? 4.332/8.664mhz 47pf 82pf 0.1uf +5v + 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 pt2579 notes: 1. two crystal frequencies may be used via the mo de pin. please refer to the table below. 2. for the 4.332mhz crystal, it is recomm ended to use txc 6a04300098 or a component with the same specifications. mode pin state crystal clock frequency (mhz) low 4.332 high 8.664
tel: 886-2-66296288 fax: 886-2-29174598 url: http://www.princeton.com.tw pt2579 v1.3 - 4 - april. 2004 rds demodulator ic pt2579 ordering information order part number package top code pt2579 16 pins, di package, 300mil pt2579 pt2579-s 16 pins, so package, 300mil pt2579-s pt2579-sn 16 pins, so package, 150mil pt2579-sn pt2579 (l) 16 pins, di package, 300mil pt2579 pt2579-s (l) 16 pins, so package, 300mil pt2579-s pt2579-sn (l) 16 pins, so package, 150mil pt2579-sn notes: 1. (l) = lead free 2. the lead free mark is put in front of the date code.
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