TDA7402 datasheet(28/59 Pages) STMICROELECTRONICS

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TDA7402

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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

4 selectable pulse suppression times for each mode

programmable noise rectifier charge/discharge current

2.4.2 ELECTRICAL CHARACTERISTICS

All parameters measured in FM mode if not otherwise specified.

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

VTR

Trigger Threshold 1)

meas.with

VPEAK=0.9V

111

mVOP

110

101

100

mVOP

011

mVOP

010

mVOP

001

mVOP

000

mVOP

VTRNOISE

noise controlled

Trigger Threshold

meas.with

VPEAK=1.5V

260

mVOP

220

180

mVOP

140

mVOP

VRECT

Rectifier Voltage

VMPX=0mV

0.9

VMPX=50mV, f=150kHz

1.7

VMPX=200mV, f=150kHz

3.5

α114

O s ignal

() at1kHz

()

O s pur iou s

() at4kHz

()

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

;

110k Hz

3 38kH z

⋅

()

–

α190

O s ignal

() at1kHz

()

O s pur iou s

() at4kHz

()

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

;

186k Hz

5 38kH z

⋅

()

–

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