7403 datasheet(13/26 Pages) STMICROELECTRONICS

13 / 26 page

65mV

30mV

8 STEPS

NOISE CONTROLLED

TRIG. THRESHOLD

MIN. TRIG. THRESHOLD

260mV(00)

220mV(01)

180mV(10)

140mV(11)

0.9V

VTH

1.5V

VPEAK(V)

D97AU648

Figure 13. Trigger Threshold vs. VPEAK

VPEAK

(VOP)

D97AU649

DEVIATION(KHz)

0.9

1.2

2.0

2.8

DETECTOR OFF (11)

32.5

Figure 14. Deviation Controlled Trigger

Adjustment

2.3V(00)

0.9V

VPEAK

E’

D98AU863

1.8V(01)

1.3V(10)

MONO

STEREO

noisy signal

good signal

ATC_SB OFF (11)

NOISE

»3V

Figure 15. Fieldstrength Controlled Trigger

Adjustment

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

LEVEL INTERN

CONTROL

VHCCH

VHCCL

LEVEL INPUT

LP 2.2KHZ

1.th ORDER

LEVEL

FM_L

FM_R

MPX

100K

D98AU952

GAIN 0..10dB

Figure 16. Block diagram of the stereo decoder

TDA7403

13/26

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