TDA7402 datasheet(35/71 Pages) STMICROELECTRONICS

35 / 71 page

TDA7402

Stereo decoder part

35/71

5.3

Notes about the characteristics

5.3.1

Intermodulation suppression

measured with: 91% pilot signal; fm = 10kHz or 13kHz.

5.3.2

Traffic radio (V.F.) suppression

measured with: 91% stereo signal; 9% pilot signal; fm=1kHz; 5% subcarrier

(f=57kHz, fm=23Hz AM, m=60%)

5.3.3

SCA (subsidiary communications authorization)

measured with: 81% mono signal; 9% pilot signal; fm=1kHz; 10%SCA - subcarrier

( f

S = 67kHz, unmodulated ).

Intermodulation (Note 2.3.1)

α2

fmod=10kHz, fspur=1kHz

α3

fmod=13kHz, fspur=1kHz

Traffic Radio (Note 2.3.2)

α57

Signal f=57kHz

SCA - Subsidiary Communications Authorization (Note 2.3.3)

α67

Signal f = 67kHz

ACI - Adjacent Channel Interference (Note 2.3.4)

α114

Signal f=114kHz

α190

Signal f=190kHz

Table 7.

Electrical characteristics (continued)

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

α2

O sign al

() at1kHz

()

O spurious

() at1kHz

()

---------------------------------------------------------------- f

;

210kHz

⋅

() 19kHz

–

α3

O sign al

() at1kHz

()

O spurious

() at1kHz

()

---------------------------------------------------------------- f

;

313kHz

⋅

() 38kHz

–

α57 V.W.F

()

O sig nal

() at1kHz

()

O sp urious

() at1kHz 23kHz

()

-----------------------------------------------------------------------------------------

α67

O sign al

() at1kHz

()

O spurious

() at1kHz

()

---------------------------------------------------------------- f

;

238kHz

⋅

() 67kHz

–

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