SAA6579

INTEGRATED CIRCUITS DATA SHEET SAA6579 Radio Data System (RDS) demodulator Product specification Supersedes data of January 1994 File under Integrated Circuits, IC01 1997 Feb 24 Philips Semiconductors Product specification Radio Data System (RDS) demodulator FEATURES Anti-aliasing filter (2nd order) Integrated 57 kHz band-pass filter (8th order) Reconstruction filter (2nd order) Clocked comparator with automatic offset compensation 57 kHz carrier regeneration Synchronous demodulator for 57 kHz modulated RDS signals Selectable 4.332/8.664 MHz crystal oscillator with variable dividers Clock regeneration with lock on biphase data rate Biphase symbol decoder with integrate and dump functions Differential decoder Signal quality detector Subcarrier output. QUICK REFERENCE DATA SYMBOL VDDA VDDD Itot Vi(rms) VOH VOL Tamb PARAMETER analog supply voltage (pin 5) digital supply voltage (pin 12) total supply current RDS input amplitude (RMS value; pin 4) HIGH level output voltage for signals RDDA, RDCL, QUAL and T57 LOW level output voltage for signals RDDA, RDCL, QUAL and T57 operating ambient temperature MIN. 3.6 3.6 − 1 4.4 − −40 TYP. 5.0 5.0 6 − − − − GENERAL DESCRIPTION SAA6579 The integrated CMOS circuit SAA6579 is an RDS demodulator. It recovers the additional inaudible RDS information which is transmitted by FM radio broadcasting. The data signal RDDA and the clock signal RDCL are provided as outputs for further processing by a suitable decoder (micro...