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TDA7421 数据表(PDF) 9 Page - STMicroelectronics

部件名 TDA7421
功能描述  AM/FM TUNER FOR CAR RADIO AND Hi-Fi APPLICATIONS
PDF  38 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

TDA7421 数据表(HTML) 9 Page - STMicroelectronics

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ELECTRICAL CHARACTERISTICS (continued)
Detuning Detector
Ref: FM Test Circuit, measure:
- Inputs at VFMLIMIN, CW
- output at VMUTE,DRIVE
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
DDSTART
Detuning Detector Starting Point
frequency shift from 10.7MHz at
which VMUTE,DRIVE = VPLAY
±23
KHz
DDSLOPE,MIN
Detuning Detector Minimum
Muting Slope
frequency shift from 10.7MHz +
DDSTART, at which VMUTE,DRIVE =
VMUTE, BWM2-0 set to 100,
FMRECSEEK set to 0
22.5
30
37.5
KHz
DDSLOPE,MAX
Detuning Detector Maximum
Muting Slope
frequency shift from 10.7MHz +
DDSTART, at which VMUTE,DRIVE =
VMUTE, BWM2-0 set to 001,
FMRECSEEK set to 0
7.5
10
12.5
KHz
DDTRC
Detuning Detector Time Constant
Ratio
ratio of "reception" mode
integration time constant inside the
Detuning Detector with respect to
"seek" mode
34/6
s/s
Adjacent Channel Detector
Ref: FM Test Circuit, measure:
- Inputs at VFMLIMIN: desired 10.7MHz, 95dBu CW; undesired 10.8MHz CW
- output at VMUTE,DRIVE
- BWM2-0 set to 001
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
ACDMAX
Adjacent Channel Quality Detector
Maximum Sensitivity Threshold
amplitude of undesired signal at
which VMUTE,DRIVE = VMUTE,
HDM4-0 set to 11111
91
dBu
ACDMIN
Adjacent Channel Quality Detector
Minimum Sensitivity Threshold
amplitude of undesired signal at
which VMUTE,DRIVE = VMUTE,
HDM4-0 set to 00000
94.8
dBu
Field Strength Station Detector
Ref: FM Test Circuit, measure:
- Inputs at VFMLIMIN: desired 10.7MHz, CW
- output at VFMSD
- FMRECSEEK set to 1
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
FSSDMIN
Field Strength Station Detector
Minimum Threshold
VFMLIMIN level at which
VFMSD = 2.5, FSM4-0 set to 00000
24
dBu
FSSDMAX
Field Strength Station Detector
Maximum Threshold
VFMLIMIN level at which
VFMSD = 2.5, FSM4-0 set to 11111
76
dBu
Detuning Station Detector
Ref: FM Test Circuit, measure:
- Input at VFMLIMIN, CW;
- output at VFMSD
- FMRECSEEK set to 1
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
DSD
Detuning Station Detector
Threshold
frequency shift from 10.7MHz at
which VFMSD = 2.5V
23
KHz
TDA7421
9/38



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