TDA7406T datasheet(24/49 Pages) STMICROELECTRONICS

24 / 49 page

TDA7406T

24/49

NOISE BLANKER PART

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 3. ELECTRICAL CHARACTERISTICS

All parameters measured in FM mode if not otherwise specified.

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

VTR

Trigger Threshold 1)

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

VRECT

Rectifier Voltage

VMPX=0mV

0.5

0.9

1.3

VMPX=50mV, f=150kHz

1.5

1.7

2.1

VMPX=200mV, f=150kHz

2.5

2.9

VRECTDEV Deviation dependent

Rectifier Voltage

meas.with

VMPX=500mV

(75kHz dev.)

0.5

0.9

1.7

2.5

0.9 (off)

1.2

2.0

2.8

1.3

1.5

2.3

3.1

VOP

VRECTFS

Fieldstrength

controlled Rectifier

Voltage

meas.with

VMPX=0mV,

VLEVEL<< VSBL

(fully mono)

0.5

0.9

1.7

2.1

0.9 (off)

1.4

1.9

2.4

1.3

1.5

2.3

3.1

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