TDA7400 datasheet(11/28 Pages) STMICROELECTRONICS

11 / 28 page

2.4V(00)

0.9V

VPEAK

E’

D97AU650

1.9V(01)

1.4V(10)

MONO

STEREO

noisy signal

good signal

ATC_SB OFF (11)

NOISE

»3V

Figure 3. Fieldstrength Controlled Trigger Adjustment

Multipath Detector

Internal 19kHz band pass filter

Programmable band pass and rectifier gain

two pin solution fully independent usable for

external programming

selectable internal influence on Stereoblend

ELECTRICAL CHARACTERISTICS (continued)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

fCMP

Center Frequency of Multipath-

Bandpass

stereodecoder locked on Pilottono

KHz

GBPMP

Bandpass Gain

bits D2,D1 configuration byte = 00

bits D2,D1 configuration byte = 10

bits D2,D1 configuration byte = 01

bits D2,D1 configuration byte = 11

GRECTMP

Rectifier Gain

bits D7,D6 configuration byte = 00

7.6

bits D7,D6 configuration byte = 01

4.6

bits D7,D6 configuration byte = 10

bits D7,D6 configuration byte = 11

off

ICHMP

Rectifier Charge Current

bit D5 configuration byte = 0

0.5

µA

bit D5 configuration byte = 1

1.0

µA

IDISMP

Rectifier Discharge Current

0.5

1.5

Quality Detector

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Multipath Influence Factor

bit D7 High-Cut byte +

bit D7 Fieldstrength byte +

0.7

0.85

1.00

1.15

TDA7400

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