TDA7421 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'TDA7421' PDF : 38 Pages View PDF
TDA7421
FM SOFT MUTE / FM AUDIO MUTE GAIN (subaddress 08H)
MSB
FSM3
FSM2
FSM1
FSM0
fmsoftmute fmsoftmute fmsoftmute fmsoftmute
MSB
LSB
0
0
0
0
X
X
X
X
1
1
1
1
all combinations allowed
LSB
FUNCTION
AUM2 AUM1 AUM0
buff1 gain buff1 gain buff1 gain FM SOFT MUTE
MSB
LSB THRESHOLD
Maximum sensitivity
•••
Minimum sensitivity
Audio max mute atten.
(dB) with bit FMHIGH
byte 0 = 1
0
0
1
-2.5
0
1
0
-5
1
0
0
-7.5
0
1
1
-10
1
1
0
-12.5
1
1
1
-15
Audio max mute atten.
(dB) with bit FMHIGH
byte 0 = 0
0
0
1
-17.5
0
1
0
-20
1
0
0
-22.5
0
1
1
-25
1
1
0
-27.5
1
1
1
-30
all else not allowed
FM HOLE DETECTOR / FM DETUNING DETECTOR (subaddress 09H)
MSB
BWM2
BW MSB
BWM1
BW
BWM0
BW LSB
HDM4
Hole det
MSB
0
X
1
HDM3 HDM2 HDM1
Hole det Hole det Hole det
0
0
0
X
X
X
1
1
1
all combinations allowed
LSB
HDM0
Hole det
LSB
0
X
1
FUNCTION
MUTING SENSITIVITY
Minimum (deep hole)
•••
Maximum (shallow hole)
RECEPTION
0
0
1
0
1
0
1
0
0
all else not allowed
SEEK
0
0
0
X
X
X
1
1
1
all combinations allowed
DETUNING MUTE RANGE
10 (KHz)
15 (KHz)
30 (KHz)
CLAMPING WINDOW
Minimal Window
Intermediate values
Maximal Window
32/38
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