TDA7412 datasheet(33/56 Pages) STMICROELECTRONICS

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TDA7412

Figure 26. Internal stereoblend characteristics

The gain can be programmed through 4 bits in the "Stereodecoder-Adjustment"-byte. All necessary internal ref-

erence voltages like REF5V are derived from a bandgap circuit. Therefore they have a temperature coefficient

near zero.

Figure 27. Relation between internal and external LEVEL-voltages for setup of Stereoblend

3.9 Highcut Control

The highcut control set-up is similar to the stereoblend control set-up : the starting point VHCH can be set with

2 bits to be 42, 50, 58 or 66% of REF5V whereas the range can be set to be 17, 22, 28 or 33% of VHCH (see

fig. 30).

Figure 28. Highcut characteristics

INTERNAL

VOLTAGES

D00AU1168

VSBL

REF 5V

SETUP OF VST

INTERNAL

VOLTAGES

20%

REF 5V

SETUP OF VMO

LEVEL

LEVEL INTERN

FIELDSTRENGHT VOLTAGE

VST

VMO

LEVEL INTERN

70%

VSBL

VST

VMO

FIELDSTRENGHT VOLTAGE

LOWPASS

TIME CONSTANT

D00AU1169

τ'Deemp

τDeemp

FIELDSTRENGHT

DEEMPHASIS SHIFT ON

OFF

VHCH

VHCL

3.7

•

τ'Deemp

•

τDeemp

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