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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), 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