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