TDA7421N Datasheet, PDF (35/38 Pages) STMicroelectronics – AM/FM TUNER FOR CAR RADIO AND HI-FI APPLICATIONS

TDA7421N
7.10 FM HOLE DETECTOR / FM DETUNING DETECTOR (subaddress 08H)
MSB
LSB
FUNCTION
BWM2 BWM1 BWM0 HDM4 HDM3 HDM2 HDM1 HDM0
BW
Slope
30kHz
BW
Slope
15kHz
BW Hole det Hole det Hole det Hole det Hole det MUTING SENSITIVITY(hole
Slope MSB
LSB depth)
10kHz
0
0
0
0
0 Minimum (deep hole)
X
X
X
X
X
1
1
1
1
1 Maximum (shallow hole)
all combinations allowed
RECEPTION
DETUNING MUTE RANGE (KHz)
0
0
1
10
0
1
0
15
1
0
0
30
all else not allowed
SEEK
CLAMPING WINDOW
0
0
X
Not allowed
0
1
0
Faster Clamping Window
(±1KHz over Threshold)
X
X
X
1
1
1
Slower Clamping Window
(±4KHz over Threshold)
all combinations allowed
7.11 TUNER TESTING (subaddress 9H)
MSB
LSB
FUNCTION
PLL
T2
T1
T0 SDDIS BWDIS HDDIS SMDIS
TEST
Test
mode
PLL
Test
mode
MSB
Test
mode
Test
mode
LSB
SD Bandwid Hole
Soft
output
th detector Mute
Disable Disable Disable Disable
0
0
0
0
0
0
0
0 no test
TEST MODES
1
1
0 Soft Mute Test
1
0
1 Hole Detector Test
0
1
1 Bandwidth Test
1
1
1 Audio Mute and SD Disabled
all else not allowed
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