TDA7402 datasheet(36/71 Pages) STMICROELECTRONICS

36 / 71 page

Stereo decoder part

TDA7402

36/71

5.3.4

ACI (adjacent channel interference)

measured with: 90% mono signal; 9% pilot signal; fm=1kHz; 1% spurious signal

( f

S = 110kHz or 186kHz, unmodulated).

5.4

Noise blanker part

5.4.1

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

●

4 selectable pulse suppression times for each mode

●

programmable noise rectifier charge/discharge current

All parameters measured in FM mode if not otherwise specified.

α114

O sign al

() at1kHz

()

O sp urio us

() at4kHz

()

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

;

110kHz

3 38kHz

⋅

()

–

α190

O sign al

() at1kHz

()

O sp urio us

() at4kHz

()

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

;

186kHz

5 38kHz

⋅

()

–

Table 8.

Electrical characteristics

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

Trigger threshold (1)

meas.with

VPEAK=0.9V

111

110

101

100

011

010

001

000

TRNOISE

Noise controlled

Trigger threshold

meas.with

VPEAK=1.5V

260

220

180

140

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