TDA7405_04 Datasheet, PDF (51/57 Pages) STMicroelectronics – EQUALIZER CARRADIO SIGNAL PROCESSOR

TDA7405
Table 31. Noiseblanker II (24)
MSB
LSB
D₇
D₆
D₅
D₄
D₃
D₂
D₁
D₀
FUNCTION
PEAK charge current
0 low
1 high
0
0
0
1
1
0
1
1
Fieldstrength adjust
2.3V
1.8V
1.3V
OFF
0
0
0
1
1
0
1
1
Blank Time FM / AM
38µs / 1.2ms
25.5µs / 800µs
32µs / 1.0s
22µs / 640µs
0
0
0
1
1
0
1
1
Noise Rectifier Discharge Resistor
R = infinite
R_DC = 56k
R_DC = 33k
R_DC = 18k
Strong Multipath influence on PEAK 18k
0
off
1
on (18k discharge if V_MPout< 2.5V)
Table 32. AM / FM-Noiseblanker (25)
MSB
D₇
D₆
D₅
D₄
D₃
D₂
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
0
0
0
1
1
0
1
1
0
1
0
1
LSB
D₁ D₀
FUNCTION
Stereodecoder Mode
0 FM
1 AM
AM Rectifier Gain
0
6dB
1
8dB
0
10dB
1
12dB
0
14dB
1
16dB
0
18dB
1
20dB
Rectifier Cut-Off Frequency
14.0kHz
18.5kHz
28.0kHz
56.0kHz
Overdeviation Time Constant
on
off
AM Blank-Mode
High-Ohmic Mute
Sample&Hold
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