TDA7405 datasheet(26/57 Pages) STMICROELECTRONICS

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TDA7405

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Note 4. ACI ( Adjacent Channel Interference )

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

modulated).

NOISE BLANKER PART

8.1 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

Table 8. ELECTRICAL CHARACTERISTICS

All parameters mesured in FM mode if not otherwise specified.

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

VTR

Trigger Threshold 5)

meas.with

VPEAK=0.9V

111

mVOP

110

mVOP

101

mVOP

100

mVOP

011

mVOP

010

mVOP

001

mVOP

000

mVOP

VTRNOISE

noise controlled

Trigger Threshold

meas.with

VPEAK=1.5V

260

mVOP

220

mVOP

180

mVOP

140

mVOP

α114

o s ign al

() at1kHz

()

o sp u r io u s

() at4kHz

()

---------------------------------------------------------------- ƒ

;

110kH z

3 38 kHz

⋅

()

–

α190

o s ign al

() at1kHz

()

o sp u r io u s

() at4kHz

()

---------------------------------------------------------------- ƒ

;

186kH z

5 38 kHz

⋅

()

–

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