TDA7335 datasheet(10/20 Pages) STMICROELECTRONICS

10 / 20 page

PINS DESCRIPTION: Internal Configuration

ELECTRICAL COMPONENT DESCRIPTION (see figure 1)

COMPONENT

RECOMMENDED

VALUE

PURPOSE

TR1,TR2

C1,C2

C3,C4

R1,R2

R3,R5

R4,R6

Ω

µF

10nF

1.2K

Ω

6.8K

Ω

300K

Ω

Left/Right Channel IN/OUT equalizer filter

TR fixes the gain

150msec NORMAL

µsec METAL

C5,C6

0.33

µF ±10%

Preamplifier out to Dolby B input coupling capacitor

10k

Ω 0.22µF

Define the AMS input threshold level

Vin ⋅

101K

+ R8

⋅1.5 > 1V

where Vin =(Vright +Vleft)/2

470K

Ω

0.1

µF

Set the interprogram detection time:

INTP = 70 x 10

-3

C7[

µF] = [sec]

100K

Ω

µF

Set the interspace detection time:

INTS = 0.69 x C9x R9 sec

C15

0.1

µF

It fixes music search reset time;

Tres = 0.122 x C15[

µF] = [sec] if C15 expressed in µF

C10,C11

0.68

µF ±10%

Dolby output coupling capacitors

C12,C13

4.7

µF ±10%

Dolby time constants

C14

4.7

µF

Reference voltage external capacitor

R11

43K

Ω

It fixes the Iref current

C16

R16

0.1

µF

30K

Ω

If fixes the mute time (typ 10msec).

Figure 5: PINS: 2 - 3 - 28 - 29

Figure 6: PINS: 7 - 24

TDA7335

10/20

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