TDA7421 datasheet(35/38 Pages) STMICROELECTRONICS

35 / 38 page

IF1Vcc & IF2 Vcc

Gnd

+Vs

Supply Voltage (12V)

Ground path

PLLVcc

RFVcc

OSCVcc

+5V

10u + 100n

L4916

6 7 8

OUT 8.5V

F.C.

N.C.

220n

100u

MR1

47u

220n

100n

JP1

L78L05A

220n

Evaluation Board Schematic Circuit (part E)

Notes:

- The components shown on the evaluation board schematic without the part value, are required only

for measurements between intermediate input/outputs:

- Parts description:

CF1

Ceramic filter 10.7MHz, 180KHz BW

CF3-CF4

Ceramic filter 10.7MHz, 150KHz BW

CF2

Ceramic filter 450KHz, 6KHz BW

FM RF transformer

Unloaded Q= 103

3-1= 3 1/2T - 6-4= 1T 0.12

φ2UEW

CTUNING(3-1)= 24pF @ 100MHz

AM/FM IF1 transformer

Unloaded Q= 70

1-3= 13T - 1-5= 6 1/2T - 5-3= 6 1/2T - 4-6= 2T 0.08

φ2UEW

CINT(1-2) = CINT(2-3) = 82pF; CEXT(1-3) = 10pF

AM IF2 transformer

Unloaded Q= 40

1-3= 178T - 1-2= 89T - 2-3= 89T - 4-6= 33T 0.05

φ2UEW

CINT(1-3) = 180pF; CEXT(1-3) = 20pF

Oscillator coil

Unloaded Q= 80

6-4= 2 1/2T 0.12

φ2UEW

CTUNING(6-4)= 36.8pF @ 100MHz

Demodulator Coil

Unloaded Q= 35

6-4= 27T 0.1

φ2UEW

CINT(4-6)= 47pF; CEXT(4-6) = 13.5pF

TDA7421

35/38

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