TDA7421N Datasheet, PDF (11/38 Pages) STMicroelectronics – AM/FM TUNER FOR CAR RADIO AND HI-FI APPLICATIONS

TDA7421N
ELECTRICAL CHARACTERISTICS (Continued)
Symbol
Parameter
Test Condition
FSD_MAX Field Strength Detector
Maximum Threshold
V_FMLIMIN level at which
V_MUTE,DRIVE = V_MUTE, FSM3-0
set to 1111
Detuning Detector
Ref: FM Test Circuit; HDDIS and SMDIS set to 1, measure:
- Input at V_FMLIMIN, CW
- output at V_MUTE,DRIVE
DD_START Detuning Detector Starting Point frequency shift from 10.7MHz at
which V_MUTE,DRIVE = V_PLAY
DD_SLOPE,MIN Detuning Detector Minimum
Muting Slope
frequency shift from 10.7MHz +
DD_START at which
V_MUTE,DRIVE = V_MUTE,
BWM2-0 set to 100, SEEK set to 0
DD_SLOPE,MAX Detuning Detector Maximum
Muting Slope
frequency shift from 10.7MHz +
DD_START at which
V_MUTE,DRIVE = V_MUTE,
BWM2-0 set to 001, SEEK set to 0
DD_TRC Detuning Detector Time
Constant Ratio
ratio of "reception" mode
integration time constant inside
the Detuning Detector with
respect to "seek" mode
Adjacent Channel Detector
Ref: FM Test Circuit; BWDIS and SMDIS set to 1, measure:
- Input at V_FMLIMIN: desired 10.7MHz, 95dBµV CW; undesired 10.8MHz CW
- output at V_MUTE,DRIVE
ACD_MAX
Adjacent Channel Quality
Detector Maximum Sensitivity
Threshold
amplitude of undesired signal at
which V_MUTE,DRIVE = V_MUTE,
HDM4-0 set to 11111
ACD_MIN
Adjacent Channel Quality
Detector Minimum Sensitivity
Threshold
amplitude of undesired signal at
which V_MUTE,DRIVE = V_PLAY,
HDM4-0 set to 00000
Field Strength Station Detector
Ref: FM Test Circuit; SEEK set to 1, HDDIS and BWDIS set to 1, measure:
- Input at V_FMLIMIN: desired 10.7MHz, CW
- output at V_FMSD
FSSD_MIN
Field Strength Station Detector
Minimum Threshold
V_FMLIMIN level at which
V_FMSD = 2.5V;
FSS4-0 set to 00000
FSSD_MAX Field Strength Station Detector
Maximum Threshold
V_FMLIMIN level at which
V_FMSD = 2.5V;
FSS4-0 set to 11111
Min.
Typ.
67.5
±23
30
10
34/6
91
94.8
Max.
Unit
dBµV
KHz
KHz
KHz
s/s
dBu
dBu
dBµV
dBµV
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