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TDA7410ND データシート(PDF) 14 Page - STMicroelectronics

部品番号 TDA7410ND
部品情報  Signal processor for car radio applications
PDF  34 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA7410ND データシート(HTML) 14 Page - STMicroelectronics

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Description of the audioprocessor part
TDA7410ND
14/34
5.7
Speaker Attenuator
Due to practical aspects the steps in the speaker attenuators are not linear over the full
range. At attenuations more than 24dB the steps increase from 2dB to 8dB (please see data
byte specification).
5.8
Stereodecoder part
●
No External components necessary
●
PLL with adjustment fully integrated VCO
●
Automatic pilot dependent MONO/STEREO switching
●
Very high suppression of intermodulation and interference
●
Highcut and Stereoblend characteristics programmable in a wide range
●
Internal noiseblanker with threshold controls
●
I2C bus control of all necessary functions
Table 6.
Stereodecoder electrical characteristics
VDD = 8.5V, Deemphasis time const = 50µs, VMPX = 500mV, In Gain = 6dB, 75kHz
deviation, f = 1kHz, Tamb =25°C, unless otherwise spificied
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
VIN
MPX input level
Input gain = 3.5dB
0.5
VRMS
Rin
Input resistance
100
k
Ω
Gain
Minimum input gain
3.5
dB
Gmax
Maximum input gain
11
dB
GSTEP
Step resolution
2.5
dB
a
Max. channel separation
40
dB
Mono/stereo switch
VPTHST1
Pilot threshold voltage
For stereo, PTH=1
10
15
25
mV
VPTHST0
For stereo, PTH=0
15
25
35
mV
VPTHMO1
For mono, PTH=1
7
12
17
mV
VPTHMO0
For mono, PTH=0
10
19
25
mV
PLL
Δf/f
Capture Range
0.5
%
Deemphass and highcut
τHC50
Deemphasis time constant
Stereodecoder-Byte
D5=0 VLEVEL >> VHCH
50
μs
τHC75
Stereodecoder-Byte
D5=1 VLEVEL >> VHCH
75
μs
τHC50
Highcut time constant
Stereodecoder-Byte
D5=0 VLEVEL >> VHCH
150
μs
τHC75
Stereodecoder-Byte
D5=1 VLEVEL >> VHCH
225
μs



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