TDA7411 datasheet(19/43 Pages) STMICROELECTRONICS

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TDA7411

carrier (f = 57kHz, fm = 23Hz AM, m = 60%)

3. SCA ( Subsidiary Communications Authorization ) measured with: 81% mono signal; 9% pilot signal;

fm = 1kHz; 10%SCA - subcarrier ( fs = 67kHz, unmodulated ).

; Fs =(2 x 38kHz) - 67kHz

4. ACI ( Adjacent Channel Interference ):

; Fs = 110kHz - (3 x 38kHz)

; Fs = 186kHz - (5 x 38kHz)

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

unmodulated).

NOISE BLANKER PART

Features:

– internal 2nd order 140kHz high-pass filter

– programmable trigger threshold

– trigger threshold dependent on high frequency noise with programmable gain

– additional circuits for deviation- and fieldstrength-dependent trigger adjustment

– very low offset current during hold time due to opamps with MOS inputs

– 4 selectable pulse suppression times

– programmable noise rectifier charge/discharge current

ELECTRICAL CHARACTERISTICS (continued)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

VTR

Trigger Threshold 0) 1)

meas. with VPEAK = 0.9V

NBT = 111

(c)

mVOP

NBT = 110

(c)

mVOP

NBT = 101

(c)

mVOP

NBT = 100

(c)

mVOP

NBT = 011

(c)

mVOP

NBT = 010

(c)

mVOP

NBT = 001

(c)

mVOP

NBT = 000

(c)

mVOP

VTRNOISE Noise Controlled Trigger

Threshold 2)

meas. with VPEAK = 1.5V

NCT = 00

(c)

260

(c)

mVOP

NCT = 01

(c)

220

(c)

mVOP

NCT = 10

(c)

180

(c)

mVOP

NCT = 11

(c)

140

(c)

mVOP

VRECT

Rectifier Voltage

VMPX = 0mV

NRD 6) = 00

0.5

0.9

1.3

VMPX = 50mV; f = 150KHz

1.5

1.7

2.1

VMPX = 200mV; f = 150KHz

3.5

α57 V.W > F.

()

O sig nal

() at1kHz

()

Osp uriou s

() at1kHz 23kHz

()

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

α67

O si gna l

() at1kHz

()

O spu riou s

() at9kHz

()

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

α114

O s igna l

() at1kHz

()

Osp uriou s

() at4kHz

()

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

α114

O s igna l

() at1kHz

()

Osp uriou s

() at4kHz

()

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

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