TDA7461N datasheet(16/31 Pages) STMICROELECTRONICS

16 / 31 page

MULTIPATH DETECTOR

Internal 19kHz bandpass filter

Programmable bandpass 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 pilot

tone

KHz

GBPMP

Bandpass Gain

bits D2,D1 configuration byte = 00

bits D2,D1 configuration byte = 01

bits D2,D1 configuration byte = 10

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

ICHMP

Rectifier Charge Current

µA

IDISMP

Rectifier Discharge Current

1.5

INGAIN

3.5 ... 11dB

STEP 2.5dB

INFILTER

LP 80KHz

4.th ORDER

DEMODULATOR

- PLOT CANC

- ROLL-OFF COMP.

- LP 25KHz

PLL +

PILOT-DET.

F19

NOISE BLANKER

F38

STEREO

HOLDN

SB CONTROL

DEEMPHASIS

+ HIGHCUT

t=50 or 75

µs

REF 5V

VSBL

MPINFL

LEVEL INTERN

CONTROL

VHCCH

VHCCL

MULTIPATH

DETECTOR

MPOUT

LEVEL INPUT

LP 2.2KHZ

1.th ORDER

MPIN

LEVEL

FM_L

FM_R

MPX

100K

D97AU762

GAIN 0..10dB

Figure 17. Block diagram of the stereodecoder

TDA7461N

16/31

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