TDA7410ND Datasheet, PDF (14/34 Pages) STMicroelectronics – Signal processor for car radio applications

Description of the audioprocessor part
TDA7410ND
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.
Symbol
Stereodecoder electrical characteristics
V_DD = 8.5V, Deemphasis time const = 50µs, V_MPX = 500mV, In Gain = 6dB, 75kHz
deviation, f = 1kHz, T_amb =25°C, unless otherwise spificied
Parameter
Test Condition
Min. Typ. Max.
Unit
V_IN
Rin
Gain
MPX input level
Input resistance
Minimum input gain
Input gain = 3.5dB
0.5
V_RMS
100
kΩ
3.5
dB
Gmax
G_STEP
a
Maximum input gain
Step resolution
Max. channel separation
11
dB
2.5
dB
40
dB
Mono/stereo switch
V_PTHST1
V_PTHST0
V_PTHMO1
V_PTHMO0
PLL
Pilot threshold voltage
For stereo, PTH=1
For stereo, PTH=0
For mono, PTH=1
For mono, PTH=0
10
15
25
mV
15
25
35
mV
7
12
17
mV
10
19
25
mV
Δf/f
Capture Range
0.5
%
Deemphass and highcut
τHC50
Deemphasis time constant
Stereodecoder-Byte
D5=0 V_LEVEL >> V_HCH
50
μs
τHC75
Stereodecoder-Byte
D5=1 V_LEVEL >> V_HCH
75
μs
τHC50
Highcut time constant
Stereodecoder-Byte
D5=0 V_LEVEL >> V_HCH
150
μs
τHC75
Stereodecoder-Byte
D5=1 V_LEVEL >> V_HCH
225
μs
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