參數(shù)資料
型號: TDA7412
廠商: STMICROELECTRONICS
元件分類: 音頻控制
英文描述: 1 CHANNEL(S), TONE CONTROL CIRCUIT, PQFP44
封裝: 10 X 10 MM, 1.40 MM HEIGHT, TQFP-44
文件頁數(shù): 27/56頁
文件大?。?/td> 716K
代理商: TDA7412
33/56
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
t
D00AU1168
VSBL
REF 5V
SETUP OF VST
INTERNAL
VOLTAGES
t
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
3
τDeemp
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