TDA7412 datasheet(25/56 Pages) STMICROELECTRONICS

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TDA7412

2.3 NOTES TO THE CHARACTERISTICS

2.3.1 Intermodulation Suppression

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

2.3.2 Traffic Radio (V.F.) Suppression

measured with: 91% stereo signal; 9% pilot signal; fm=1kHz; 5% subcarrier (f=57kHz, fm=23Hz AM, m=60%)

2.3.3 SCA ( Subsidiary Communications Authorization )

measured with: 81% mono signal; 9% pilot signal; fm=1kHz; 10%SCA - subcarrier ( fS = 67kHz, unmodulated ).

2.3.4 ACI ( Adjacent Channel Interference )

measured with: 90% mono signal; 9% pilot signal; fm=1kHz; 1% spurious signal ( fS = 110kHz or 186kHz, un-

modulated).

2.4 NOISE BLANKER PART

2.4.1 Features:

AM and FM mode

internal 2nd order 140kHz high-pass filter for MPX path

internal rectifier and filters for AM-IF path

programmable trigger thresholds

trigger threshold dependent on high frequency noise with programmable gain

additional circuits for deviation- and fieldstrength-dependent trigger adjustment

α2

O s i gn al

() at1kHz

()

O sp u r i o u s

() at1kHz

()

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

;2 10kHz

⋅

() 19kHz

–

α3

O s i g nal

() at1kHz

()

O s p uri ous

() at1kHz

()

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

;

313kH z

⋅

() 38kHz

–

α57 V.W.F

()

O s i gn al

() at1kHz

()

O s p ur i o us

() at1kHz 23kHz

()

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

α67

O s i g nal

() at1kHz

()

O s p uri ous

() at1kHz

()

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

;

238kH z

⋅

() 67kHz

–

α114

O s i gna l

() at1kHz

()

O s puri o u s

() at4kHz

()

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

;

110 kHz

3 38kHz

⋅

()

–

α190

O s i gna l

() at1kHz

()

O s puri o u s

() at4kHz

()

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

;

186 kHz

5 38kHz

⋅

()

–

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