NEC UPC2539GS Datasheet

PRELIMINARY DATA SHEET

Bi-CMOS INTEGRATED CIRCUIT

µ

PC2539

RDS DATA DEMODULATOR IC

The µPC2539 is data demodulator IC for FM receiver applying to Radio Data System in European countries and

Radio Broadcasting Data System in USA.

This IC carries out to extract 57kHz RDS signal from FM multiplex signal, demodulate data-stream, recover

bit-rate-clock, and discriminate SK signal in ARI system.

FEATURES

• Adjustment-free

• Built-in 57kHz band-pass-filter consist of switched capactiors.

• High sensitivity.

• Employing digital PLL.

• Small outline plastic package

ORDERING INFORMATION

Part Number Package

µ

PC2539GS 24-pin plastic SOP (300 mil)

BLOCK DIAGRAM

24 23 22 21 20 19 18 17 16 15 14 13

COSTAS

BIPHASE

DECODER

DIFFERENTIAL

DECODER

123456789101112

57kHz BPF

CLOCK

RECOVERY

SK DET

OSC

The information in this document is subject to change without notice.

Document No. S11570EJ1V0DS00 (1st edition)
Date Published May 1996 P
Printed in Japan

©

1996

PIN CONFIGURATION (Top View)

V

µ

PC2539

DD

1

24

CC

V

TEST1

TEST2

CLK OUT

DATA OUT

RDS IND

SK IND

TEST3

TEST4

DGND

OSC IN

OSC OUT

10

11

12

2

3

4

5

6

7

8

9

23

22

21

20

19

18

17

16

15

14

13

TEST9

TEST8

TEST7

BPF IN

REF

BPF OUT

DSB IN

AGND

OP. CTL

TEST6

TEST5

2

µ

PC2539

PIN FUNCTIONS

Pin no. Pin name Function
1VDD Power Supply for Digital Circuit
2 TEST1 Pin for Test : Normally connect to GND.
3 TEST2 Pin for Test : Normally be open.
4 CLK OUT Bit-Rate-Clock Output Pin
5 DATA OUT RDS Data Output Pin
6 RDS IND RDS Idenrification Indicator : When RDS signal is detected, the output voltage becomes

to Low level.

7 SK IND SK Identification Indicator : When SK signal is detected, the output voltage becomes to

Low level.
8 TEST3 Pin for Test : Normally connect to GND.
9 TEST4 Pin for Test : Normally connect to GND.
10 DGND GND for Digital Circuit
11 OSC IN Oscillator Input Pin
12 OSC OUT Oscillator Output Pin
13 TEST5 Pin for Test : Normally be open.
14 TEST6 Pin for Test : Normally connect to GND.
15 OP.CTL Operation/Stop control Pin : High:Operation mode, Low:Stop mode
16 AGND GND for Analog Circuit
17 DSB IN DSB Demodulator Input Pin
18 BPF OUT Band-Pass-Filter Output Pin
19 REF Reference Voltage for BPF
20 BPF IN Band-Pass-Filter Input Pin
21 TEST7 Pin for Test : Normally connect to GND.
22 TEST8 Pin for Test : Normally connect to GND.
23 TEST9 Pin for Test : Normally connect to GND.
24 VCC Power Supply for Analog Circuit

3