tda7421n STMicroelectronics, tda7421n Datasheet - Page 11

• Manufacturer Part Number: tda7421n
• Description: Am/fm Tuner For Car Radio And Hi-fi Applications
• Manufacturer: STMicroelectronics

ELECTRICAL CHARACTERISTICS (Continued)
Detuning Detector
Ref: FM Test Circuit; HDDIS and SMDIS set to 1, measure:
- Input at V
- output at V
Adjacent Channel Detector
Ref: FM Test Circuit; BWDIS and SMDIS set to 1, measure:
- Input at V
- output at V
Field Strength Station Detector
Ref: FM Test Circuit; SEEK set to 1, HDDIS and BWDIS set to 1, measure:
- Input at V
- output at V
DD
DD
FSSD
FSSD
DD
ACD
FSD
Symbol
ACD
DD
SLOPE,MAX
SLOPE,MIN
START
TRC
MAX
MAX
MIN
MAX
MIN
FMLIMIN
FMLIMIN
FMLIMIN
MUTE,DRIVE
MUTE,DRIVE
FMSD
Field Strength Detector
Maximum Threshold
Detuning Detector Starting Point frequency shift from 10.7MHz at
Detuning Detector Minimum
Muting Slope
Detuning Detector Maximum
Muting Slope
Detuning Detector Time
Constant Ratio
Adjacent Channel Quality
Detector Maximum Sensitivity
Threshold
Adjacent Channel Quality
Detector Minimum Sensitivity
Threshold
Field Strength Station Detector
Minimum Threshold
Field Strength Station Detector
Maximum Threshold
, CW
: desired 10.7MHz, 95dB V CW; undesired 10.8MHz CW
: desired 10.7MHz, CW
Parameter
V
V
set to 1111
which V
frequency shift from 10.7MHz +
DD
V
BWM2-0 set to 100, SEEK set to 0
frequency shift from 10.7MHz +
DD
V
BWM2-0 set to 001, SEEK set to 0
ratio of "reception" mode
integration time constant inside
the Detuning Detector with
respect to "seek" mode
amplitude of undesired signal at
which V
HDM4-0 set to 11111
amplitude of undesired signal at
which V
HDM4-0 set to 00000
V
V
FSS4-0 set to 00000
V
V
FSS4-0 set to 11111
FMLIMIN
MUTE,DRIVE
MUTE,DRIVE
MUTE,DRIVE
FMLIMIN
FMSD
FMLIMIN
FMSD
START
START
= 2.5V;
= 2.5V;
MUTE,DRIVE
MUTE,DRIVE
MUTE,DRIVE
Test Condition
level at which
at which
at which
level at which
level at which
= V
= V
= V
MUTE
MUTE
MUTE
= V
= V
= V
, FSM3-0
,
,
PLAY
MUTE
PLAY
,
,
Min.
Typ.
67.5
34/6
94.8
±23
30
10
91
Max.
TDA7421N
dB V
dB V
dB V
Unit
KHz
KHz
KHz
dBu
dBu
s/s
11/38