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TDA7421N Datasheet(PDF) 12 Page - STMicroelectronics

Part # TDA7421N
Description  AM/FM TUNER FOR CAR RADIO AND HI-FI APPLICATIONS
PDF  38 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA7421N Datasheet(HTML) 12 Page - STMicroelectronics

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TDA7421N
12/38
Detuning Station Detector
Ref: FM Test Circuit; SEEK set to 1, HDDIS and SMDIS set to 1, measure:
- Input at VFMLIMIN, CW;
- output at VFMSD
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
DSD
Detuning Station Detector
Threshold
frequency shift from 10.7MHz at
which VFMSD = 2.5V
±28
KHz
Adjacent Channel Station Detector
Ref: FM Test Circuit; SEEK set to 1, HDDIS and SMDIS set to 1, measure:
- Input at VFMLIMIN: desired 10.7MHz, 95dBµV CW; undesired 10.8MHz CW
- output at VFMSD
ACSDMAX
Adjacent Channel Detector
Maximum Sensitivity Threshold
amplitude of undesired signal at
which VFMSD = 2.5V, HDM4-0
set to 11111
92.5
dB
µV
ACSDMIN
Adjacent Channel Detector
Minimum Sensitivity Threshold
amplitude of undesired signal at
which VFMSD = 2.5V, HDM4-0
set to 00000
94.9
dB
µV
AM Mixer 1
Ref: AM Test Circuit, measure input at VMIX1AMIN, output at VMIXOUT
RIN,MIX1
Input Resistance
1.2
K
Ω
GMIX1
Conversion Gain
fIN = 1MHz
7.6
dB
IP3MIX1
3rd Order Intermodulation
Distortion Intercept Point
fd = 1MHz; fu1 = 1.1MHz;
fu2 = 1.2MHz
131
dB
µV
CP1MIX1
1dB Compression Point
fIN = 1MHz
110
dB
µV
CAdj1
Value of the minimum adjusting
capacitance step
T1A3-0 set to 1000
0.38
pF
AM Wide & Narrow AGC
Ref: AM Test Circuit; measure input at VMIX1AMIN and VMIX2AMIN, output at VAMAGC1AMP and VAMAGC1PIN
VWAGCMIN
Open Loop WIDE AGC
Minimum Starting Point
fWAGCIN = 999kHz, AAGW1-0
set to 11; VMIX1AMIN at which
VAMAGC1AMP = 2.5V
95
dB
µV
VWAGCMAX
Open Loop WIDE AGC
Maximum Starting Point
fWAGCIN = 999kHz, AAGW1-0
set to 00; VMIX1AMIN at which
VAMAGC1AMP = 2.5V
101
dB
µV
VNAGCMIN
Open Loop NARROW AGC
Minimum Starting Point
fNAGCIN = 10.7MHz, AAGN1-0
set to 11; VMIX2AMIN at which
VAMAGC1AMP = 2.5V
81
dB
µV
VNAGCMAX
Open Loop NARROW AGC
Maximum Starting Point
fNAGCIN = 10.7MHz, AAGN3-0
set to 00; VMIX2AMIN at which
VAMAGC1AMP = 2.5V
87
dB
µV
ROUTAMAGC1 Output Resistance
23.3
K
Ω
IAMAGC1PIN Maximum Antenna Attenuation
Diode Current
fWAGCIN = 999kHz; VMIX1AMIN =
120dB
µV; AAGW1-0 set to 00
1.4
mA
ELECTRICAL CHARACTERISTICS (Continued)



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