Samsung S1A0905-S0B0 Manuel utilisateur

RDS DEMODULATOR IC S1A0905

Preliminary

GENERAL DESCRIPTION

THE OUTLINE OF RDS(RADIO DATA SYSTEM)

Since 1988 most European national broadcaststations transmit RDS-

code beside their audio signals. RDS means Radio Data System and

was originally intended to give people in their cars additional informa-

tion about the weather or traffic(jams). But RDS has grown out to one

big channel of information. Radiostations send their name, the time

(with DCF-77 accuracy), their type of music (format) and even more.

The digital data of RDS are multiplexed into an FM radio wave using a

sub-carrier of 57kHz. The transmission rate of RDS data is

1.1875kbit/sec.

The transmission rate of RDS data is 1.1875kbit/sec, and RDS data

are encoded by differential encoding method. Then the encoded RDS data are modulated by BPSK using a clock

of 1.1875kHz. The modulated RDS data is are modulated by carrier suppressed amplitude modulation using a sub-

carrier of 57kHz. And that signal are multiplexed into an FM radio wave.

•RDS data are obtained by demodulating the received RDS modulation signal in RDS demodulator. First, the RDS

modulation signal is extracted from an FM radio wave using a band pass filter. The BPSK signal is obtained from

extracted RDS modulation signal by a 57kHz carrier recovery circuit. Then the bit rate clock of RDS data is

extracted from the BPSK signal, and the BPSK signal is demodulated using the extracted clock signal. Then the

RDS data are decoded by a differential decoding method using the demodulated BPSK signal.

FEATURES

•Low Current

•Two Stage Anti-aliasing Filter

•8'th 57kHz Switched Capacitor Bandpass Filter

•DSB Demodulation (Carrier Recovery)

•Clock Recovery Circuit

•Biphase Decoder & Differential Decoder

•Quality Indication Output for Demodulated Data

ORDERING INFORMATION

DEVICE PACKAGE OPERATING TEMP.

S1A0905-S0B0 16-SOP-225 -40 −+85

16−SOP−225

S1A0905 RDS DEMODULATOR IC

Preliminary

DESCRIPTIONS

The S1A0905 is a RDS demodulator. It recovers the RDS data which is transmitted by FM radio broadcasting. The

device operates in accordance with the EBU(European Broadcasting Union) specifications.

The IC includes a two stage antialiasing filter, a 57kHz switched capacitor bandpass filter, a comparator, a 57kHz

carrier recovery circuit, a bit rate clock recovery circuit, BPSK decoder, differential decoding circuit, and RDS signal

quality output.

BLOCK DIAGRAM

Smoothing filter & Comparator BPSK

BPSK Recovered clock

RDS DEMODULATOR

MUX

VREF

VDDA

VSSA

COMP QUAL(High or Low)

DATAO

CLKO

XOSCO

XOSCI

4.332MHz 20pF

20pF

2'nd Antialiasing Filter Switched capacitor filter

VSS

+5.0VVDD

RSTB

TEST

TIN

BIAS

8'th order

SCF

BGR

Oscillator &

Divider

Carrier

Recovery Clock

Recovery

PLL

1.1875kHz

Biphase

Decoder Differential

Decoder

RDS DEMODULATOR IC S1A0905

Preliminary

PIN CONFIGURATION

PIN DESCRIPTIONS

I: Input pin, O: Output pin, P: Power pin

Pin Name I/O Description

1QUAL OOutput for data quality indication (High = good data Low = bad data)

2DATAO ORDS data output

3VREF OSystem reference voltage output (2.5V)

4MUX IComposite signal input

5VDDA PAnalog power (+5.0V)

6VSSA P

7SGND PSystem ground

8COMP OBandpass filter output

9TEST ITest enable selecton pin (High = Test mode, Low = Normal mode)

10 TIN IInput signal for Test mode (Normally ground or open)

11 VSS PDigital power(+5.0V)

12 VDD P

13 XOSCI IXtal oscillator input

14 XOSCO OXtal oscillator output

15 RSTB IInput for system reset (High = active mode, Low = reset mode)

16 CLKO ORDS clock output (1187.5Hz)

QUAL

DATAO

VREF

MUX

VDDA

VSSA

SGND

COMP

SEC

S1A0905X01

TEST

TIN

VSS

VDD

XOSCI

XOSCO

RSTB

CLKO

16 SOP

(TOP VIEW)

S1A0905 RDS DEMODULATOR IC

Preliminary

ELECTRICAL CHARACTERISTICS

Recommended Operating Conditions (Ta = 25

Electrical Characteristics (VDDA = 5.0V, Ta = 25

C, fosc = 4.332MHz)

Parameter Symbol Min. Typ. Max. Unit Conditions

Power supply voltage1 VDDA 4.5 5.0 5.5 VAnalog power

Power supply voltage2 VDD 4.5 5.0 5.5 VDigital power

Parameter Symbol Min. Typ. Max. Unit Conditions

Operating current Isum -3.5 4.0 mA i(VDDA)+i(VDD)

Reference voltage VREF 2.4 2.5 2.6 V

Ouput high level Voh VDDA-1.0 VDDA-0.3 -VCLKO,DATAO,QUAL

Output low level Vol -0.2 1.0 VCLKO,DATAO,QUAL

Center frequency Fc 56.5 57 57.5 kHz

Gain GA 23 26 29 dB Fc=57kHz, MUXFILO

Attenuation1 ATT1 -18 -22 -dB 57.0kHz4kHz

Attenuation2 ATT2 -65 -80 -dB 38kHz

Attenuation3 ATT3 -35 -50 -dB 67kHz

S/N ratio SN 30 40 -dB 57kHz Vin=3mVrms

Input level Vin 1-500 mVrms

RDS detecter sensitivity SRDS -0.5 1.0 mVrms

RDS input level VRDS - - 300 mVrms

DATA rate DRATE -1187.5 -Hz

Clock transient vs. DATA CT -4.3 -us

Lockup time(RDS) TL -100 200 ms

XTAL frequency Fosc -4.332 -MHz

Clock input high level Xosci 4.0 - - V

Clock input low level Xosco - - 1.0 V

Output Amplitude Xosc -4.5 -Vpp

Load capacitance CL -20 -pF

RDS DEMODULATOR IC S1A0905

Preliminary

TEST APPLICATION

Analog ground

Analog power Digital power

Digital ground

:Input & Monitor Pin

:Switch

:Crystal oscillator

S1A0905X01

4.332MHz

I2 SW2

QUAL DATAO VREF MUX VDDA VSSA SGND COMP

TESTTINVSSVDDXOSCIXOSCORSTBCLKO

20pF

SW3

A B

SW4

SW5

O2 O3

0.01uF

10uF

10nF SW1

14pF

0.1uF 10uF 0.1uF 10uF

*1: Digital power supply and Analog power supply are separated in the IC

*2: It must have VDD (Digital power supply) of a sufficiently low impedence

S1A0905 RDS DEMODULATOR IC

Preliminary

NOTES

Table des matières

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