TDA7406 Datasheet, PDF (55/64 Pages) STMicroelectronics – Car radio signal processor

TDA7406
I2C bus interface
Table 23. Noiseblanker II (24)
MSB
D₇ D₆ D₅ D₄ D₃ D₂
0
0
1
1
00
01
10
11
00
01
10
11
0
1
LSB
D₁ D₀
FUNCTION
PEAK charge current
0 low
1 high
Fieldstrength adjust
0
2.3V
1
1.8V
0
1.3V
1
OFF
Blank Time FM / AM
38µs / 1.2ms
25.5µs / 800µs
32µs / 1.0s
22µs / 640µs
Noise Rectifier Discharge Resistor
R = infinite
R_DC = 56k
R_DC = 33k
R_DC = 18k
Strong Multipath influence on PEAK 18k
off
on (18k discharge if V_MPout< 2.5V)
Table 24.
MSB
D₇ D₆
11
AM / FM-Noiseblanker (25)
LSB
D₅ D₄ D₃ D₂ D₁ D₀
FUNCTION
Stereodecoder Mode
0 FM
1 AM
AM Rectifier Gain
000
6dB
001
8dB
010
10dB
011
12dB
100
14dB
101
16dB
110
18dB
111
20dB
Rectifier Cut-Off Frequency
00
14.0kHz
01
18.5kHz
10
28.0kHz
11
56.0kHz
must be “1”
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