THERMAL DATA

Symbol

Description

DIP20

SO20

Unit

Thermal Resistance Junction-Ambient

Max

100

200

°C/W

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Supply voltage

4.5

5

5.5

V

Supply current

7.5

11.0

mA

FILTER

Center frequency

56.5

57

57.5

kHz

BW

3dB Bandwidth

2.5

3

3.5

kHz

G

Gain

f = 57kHz

18

20

22

dB

A

Attenuation

∆f ± 4kHz

18

22

dB

f = 38kHz

50

60

dB

f = 67kHz

35

45

dB

Input impedance of MPX

80

120

150

K

Ω

Load impedance on FILOUT

1

M

Ω

S/N

Signal to noise ratio

30

40

dB

MPX input signal

f = 19kHz; T3

≤ 40dB(1)

f = 57kHz (RDS+ ARI)

1000

50

Reference

V

DEMODULATOR

Input pins (EXTRES, FSEL, TM)

all with internal pull down resistor

Input pin (OSEL)

with internal pull up resistor

Input Current

15

30

µA

Input Current

-25

-10

µA

Input voltage high

0.7

V

Input voltage low

0.2

V

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

Ouput voltage high

4

4.6

V

Output voltage low

0.4

1

V

OSCILLATOR

VCLL

Input level OSCIN pin

OSEL = open circuit

1

V

VCLH

Input level OSCIN pin

OSEL = open circuit

4

V

Amplitude OSCOUT

OSEL = open circuit

4.5

V

Amplitude OSCIN

(for external drive)

OSEL = GND,

f = 4.332MHz

100

mVpp

OSEL = GND,

f = 8.664MHz

120

mVpp

OSEL = GND,

f = 17.328MHz

150

mVpp

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

TDA7479

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