TDA7331 [STMICROELECTRONICS]

SINGLE CHIP RDS DEMODULATOR+ FILTER; 单芯片RDS解调器+过滤器


型号：	TDA7331
厂家：	ST
描述：	SINGLE CHIP RDS DEMODULATOR+ FILTER 单芯片RDS解调器+过滤器过滤器消费电路商用集成电路光电二极管 LTE
文件：	总7页 (文件大小：58K)
中文：	中文翻译
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TDA7331

SINGLE CHIP RDS DEMODULATOR + FILTER

VERY HIGH RDS DEMODULATION QUALITY

WITH IMPROVED DIGITAL SIGNAL PROC-

ESSING

HIGH PERFORMANCE, 57KHz BANDPASS

FILTER (8th ORDER)

PURELY DIGITAL RDS DEMODULATION

WITHOUT EXTERNAL COMPONENTS

ARI INDICATION AND RDS SIGNAL QUAL-

ITY OUTPUTS

4.332MHz CRYSTAL OSCILLATOR

(8.664 and 17.328MHz SELECTABLE OP-

TIONS)

DIP20

SO20

ORDERING NUMBERS:

LOW NOISE CMOS TECHNOLOGY

LOW RADIATION

TDA7331

TDA7331D

DESCRIPTION

caded antialiasing + switched capacitors band-

pass filter for precise RDS band selection and a

demodulatingsection that performs the extraction

od RDS data stream (RDDA) and clock (RDCL),

to be furher processed by a suitable RDS de-

coder.

The TDA7331, an improved version of

TDA7330B, recovers the additional inaudible

RDS information which is transmittedby FM radio

broadcasting stations and operates in accord-

ance with the EBU (European Broadcasting Un-

ion) specifications.

Outputs for RDS signal quality and ARI indication

are also present.

The device is made up of two sections: a cas-

BLOCK DIAGRAM and TEST CIRCUIT

C1 27pF 4.332MHz C2 47pF

T57

OSCIN

OSCOUT

MPX

2nd ORDER

ANTIALIASING

FILTER

270pF

OSEL

FSEL

OSCILLATOR

DIVIDER

RDCL

1187.5Hz

PLL

8th ORDER

SC-BANDPASS

FILTER

57KHz PLL

FILOUT

ARI

QUAL

FAST ARI

INDICATOR

QUAL DET.

V_S

100nF

POLARITY

BIPHASE DEC.

VREF

MUX

DIFF. DECODER

RDDA

10µF

INTEGRAL

BIPHASE DEC.

TEST LOGIC

6,7,8,17

N.C.

EXTRES

D97AU686B

GND

February 1998

1/7

TDA7331

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

Value

-40 to 85

-55 to 150

Unit

V_S

T_op

T_stg

Supply Voltage

Operating Temperature Range

Storage Temperature

PIN FUNCTION

N^opin

Name

Functional description

MPX

VREF

OSEL

RDS input signal

Reference voltage

Oscillator selector pin: - open, or closed to Vs = quartz oscillator

- closed to GND = external driven

FILOUT

GND

Filter output

Ground

Not connected

OSCOUT

OSCIN

T57

Oscillator output

Oscillator input

Testing output pin: 57kHz clock output

RDS clock output 1187.5Hz

RDS data output

Output for signal quality indication (High = good)

Output for ARI indication: - high when RDS+ARI are present

- high when only ARI is present

RDCL

RDDA

QUAL

ARI

- low when only RDS is present

- undefined when nos signal is present

FSEL

Supply voltage

Not connected

Frequency selector pin: - 100K to V_S= 17.328MHz

- open = 4.332MHz

- closed to V_S= 8.664MHz

Test mode pin: - open = normal operation

- closed to V_S= testmode

EXTRES

Reset pin: - open = run mode

- closed to V_S= reset condition

PIN CONNECTION

MPX

VREF

OSEL

FILOUT

GND

EXTRES

FSEL

N.C.

V_S

N.C.

ARI

N.C.

QUAL

RDDA

RDCL

T57

N.C.

OSCOUT

OSCIN

D97AU687

2/7

TDA7331

THERMAL DATA

Symbol

Description

Thermal Resistance Junction-Ambient

DIP20

SO20

Unit

R_{th j-amb}

Max

100

200

C/W

ELECTRICAL CHARACTERISTICS (T_amb= 25°C, V_S= 5V, unless otherwise specified).

Symbol

Parameter

Supply voltage

Test Condition

Min.

Typ.

Max.

5.5

Unit

V_S

I_S

4.5

Supply current

7.5

11.0

FILTER

f_C

Center frequency

3dB Bandwidth

Gain

56.5

2.5

57.5

3.5

kHz

f = 57kHz

4kHz

120

Attenuation

∆ ±

f = 38kHz

f = 67kHz

R_I

R_L

Input impedance of MPX

Load impedance on FILOUT

Signal to noise ratio

150

Ω

S/N

V_IN

V_IN= 3mV_RMS

1000 mV_RMS

MPX input signal

f = 19kHz; T3 ≤ 40dB(1)

f = 57kHz (RDS+ ARI)

mV_RMS

V_REF

Reference

V_S/2

DEMODULATOR

Input pins (EXTRES, FSEL, TM)

Input pin (OSEL)

all with internal pull down resistor

with internal pull up resistor

I_PD

I_PU

V_IH

V_IL

Input Current

V_IN= 5V (pull-down input)

V_IN= 0V (pull-up input)

Input Current

-25

-10

Input voltage high

Input voltage low

0.7 V_S0.8 V_S

0.2 V_S0.3 V_S

Output pins (RDCL, RDDA, ARI, QUAL, T57)

V_OH

V_OL

Ouput voltage high

Output voltage low

I_L= 0.5mA

4.6

0.4

OSCILLATOR

VCLL

Input level OSCIN pin

OSEL = open circuit

VCLH

Input level OSCIN pin

Amplitude OSCOUT

4.5

V_PP

Amplitude OSCIN

(for external drive)

OSEL = GND,

f = 4.332MHz

100

mVpp

OSEL = GND,

f = 8.664MHz

120

150

mVpp

OSEL = GND,

f = 17.328MHz

(1) The 3rd harmonic (57kHz) must be less than -40dB with respect to the input signal plus gain.

3/7

TDA7331

Figure 1. RDS timing diagram

CLOCK

LINE

DATA

LINE

OUTPUT TIMING

The RDS (1187.5Hz) output clock on RDCL line

is synchronizedto the incoming data.

According to the internal PLL lock condition data

change can result on the falling or on the rising

clock edge. (see Fig. 1)

A special mode is introduced to reduce EMI. With

pin OSEL connected to GND the internal oscilla-

tor is switched off and an external sinusoidal fre-

quency could be applied on OSCIN. The peak to

peak voltage of this signal can be reduced down

to 60mV.

Whichever clock edge is used by the decoder

(rising or falling edge) the data will remain valid

for 416.7 µsec after the clock transition.

In this mode the frequency selection via FSEL is

still active.

Suggested values of C1 and C2 are shown in the

following table:

OSCILLATOR CONTROLS (FSEL, OSEL)

Crystal

Three different crystal frequencies can be used.

The adaption of the internal clock divider to the

external crystal is achieved via the input pin

FSEL. See the followings table for reference:

4.332MHz

8.664MHz

17.328MHz

27pF

47pF

Crystal

FSEL (pin configuration)

4.332MHz

8.664MHz

17.328MHz

connected to GND or open

connected to Vs

external resistor of 100K to Vs

4/7

TDA7331

DIP20 PACKAGE MECHANICAL DATA

inch

DIM.

MIN.

0.254

1.39

TYP.

MAX.

MIN.

0.010

0.055

TYP.

MAX.

1.65

0.065

0.45

0.25

0.018

0.010

25.4

1.000

8.5

2.54

22.86

0.335

0.100

0.900

7.1

0.280

0.155

3.93

3.3

0.130

1.34

0.053

5/7

TDA7331

SO20 PACKAGE MECHANICAL DATA

inch

DIM.

MIN.

TYP.

MAX.

2.65

0.3

MIN.

TYP.

MAX.

0.104

0.012

0.096

0.019

0.013

0.1

0.004

2.45

0.49

0.32

0.35

0.23

0.014

0.009

0.5

0.020

45 (typ.)

12.6

13.0

0.496

0.394

0.512

0.419

10.65

1.27

0.050

0.450

11.43

7.4

0.5

7.6

0.291

0.020

0.299

0.050

0.030

1.27

0.75

8 (max.)

6/7

TDA7331

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the

consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No

license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specification men-

tioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.

SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without ex-

press written approval of SGS-THOMSON Microelectronics.

SGS-THOMSON Microelectronics GROUP OF COMPANIES

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7/7

TDA7331 [STMICROELECTRONICS]

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