S1A0905-S0B0 [SAMSUNG]

RDS DEMODULATOR IC; RDS解调器IC


型号：	S1A0905-S0B0
厂家：	SAMSUNG
描述：	RDS DEMODULATOR IC RDS解调器IC
文件：	总6页 (文件大小：58K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Preliminary

RDS DEMODULATOR IC

S1A0905

GENERAL DESCRIPTION

16- SOP- 225

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

16-SOP-225

OPERATING TEMP.

S1A0905-S0B0

-40 - +85

Preliminary

S1A0905

RDS DEMODULATOR IC

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

RSTB TIN TEST

RDS DEMODULATOR

XOSCI

8'th order

SCF

20pF

MUX

Oscillator &

Divider

4.332MHz

Switched capacitor filter

2'nd Antialiasing Filter

+5.0V

Smoothing filter & Comparator

XOSCO

BPSK

VDD

VSS

20pF

Carrier

Recovery

Clock

Recovery

PLL

CLKO

1.1875kHz

BPSK

Recovered clock

VREF

Biphase

Decoder

Differential

Decoder

DATAO

VDDA

VSSA

BGR

BIAS

COMP

QUAL(High or Low)

Preliminary

RDS DEMODULATOR IC

S1A0905

PIN CONFIGURATION

16 SOP

(TOP VIEW)

QUAL

DATAO

VREF

MUX

CLKO

RSTB

XOSCO

XOSCI

VDD

VDDA

VSSA

SGND

COMP

VSS

TIN

TEST

PIN DESCRIPTIONS

Name

QUAL

DATAO

VREF

MUX

I/O

Description

Output for data quality indication (High = good data Low = bad data)

RDS data output

System reference voltage output (2.5V)

Composite signal input

VDDA

VSSA

SGND

COMP

TEST

TIN

Analog power (+5.0V)

System ground

Bandpass filter output

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

Input signal for Test mode (Normally ground or open)

VSS

Digital power(+5.0V)

VDD

XOSCI

XOSCO

RSTB

CLKO

Xtal oscillator input

Xtal oscillator output

Input for system reset (High = active mode, Low = reset mode)

RDS clock output (1187.5Hz)

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

Preliminary

S1A0905

RDS DEMODULATOR IC

ELECTRICAL CHARACTERISTICS

Recommended Operating Conditions (Ta = 25°C)

Parameter

Symbol

VDDA

VDD

Min.

4.5

Typ.

5.0

Max.

5.5

Unit

Conditions

Analog power

Digital power

Power supply voltage1

Power supply voltage2

4.5

5.0

5.5

Electrical Characteristics (VDDA = 5.0V, Ta = 25°C, fosc = 4.332MHz)

Parameter

Operating current

Reference voltage

Ouput high level

Output low level

Symbol

Isum

VREF

Voh

Min.

Typ.

3.5

Max.

4.0

2.6

Unit

Conditions

i(VDDA)+i(VDD)

2.4

2.5

VDDA-1.0 VDDA-0.3

CLKO,DATAO,QUAL

Vol

0.2

1.0

Center frequency

Gain

56.5

-22

-80

-50

57.5

kHz

Fc=57kHz, MUXFILO

57.0kHz4kHz

38kHz

Attenuation1

Attenuation2

Attenuation3

S/N ratio

ATT1

ATT2

ATT3

-18

-65

-35

67kHz

57kHz Vin=3mVrms

Input level

Vin

500

mVrms

RDS detecter sensitivity

RDS input level

SRDS

VRDS

DRATE

0.5

1.0

300

mVrms

DATA rate

1187.5

4.3

Clock transient vs. DATA

Lockup time(RDS)

100

200

XTAL frequency

Fosc

Xosci

Xosco

Xosc

4.332

MHz

Clock input high level

Clock input low level

Output Amplitude

Load capacitance

4.0

1.0

4.5

Vpp

Preliminary

RDS DEMODULATOR IC

S1A0905

TEST APPLICATION

20pF

SW3

SW2

SW4

SW5

CLKO RSTB XOSCO XOSCI VDD VSS TIN

TEST

S1A0905X01

QUAL DATAO VREF MUX VDDA VSSA SGND COMP

10nF

SW1

0.01uF

10uF

14pF

O2 O3

Analog power

Digital power

Digital ground

0.1uF

10uF

Analog ground

:Input & Monitor Pin

:Switch

:Crystal oscillator

*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

Preliminary

S1A0905

RDS DEMODULATOR IC

NOTES

S1A0905-S0B0 [SAMSUNG]

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