TDA7421 查看數據表（PDF） - STMicroelectronics
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TDA7421 Datasheet PDF : 38 Pages
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TDA7421
ELECTRICAL CHARACTERISTICS (continued)
Adjacent Channel Station Detector
Ref: FM Test Circuit, measure:
- Input at VFMLIMIN: desired 10.7MHz, 95dBu CW; undesired 10.8MHz CW
- output at VFMSD
- FMRECSEEK set to 1
Symbol
ACSDMAX
Parameter
Adjacent Channel Detector
Maximum Sensitivity Threshold
ACDMIN
Adjacent Channel Detector
Minimum Sensitivity Threshold
Test Condition
Min. Typ. Max. Unit
amplitude of undesired signal at
92.5
dBu
which VFMSD = 2.5V, HDM4-0 set
to 11111
amplitude of undesired signal at
94.9
dBu
which VFMSD = 2.5V, HDM4-0 set
to 00000
AM Section Global Performances
Refer to Evaluation Circuit and enclosed curves (S+N/N, THD)
- RF Input: fc = 1MHz, f mod = 1KHz, m = 0.3;
- Audio Output: BPF 20Hz - 20KHz
Symbol
VIN MIN
VIN US
∆Vis
S+N/N
αIMAG
αTw
THD
Parameter
Maximum Sensitivity
Usable Sensitivity
AGC Range
Signal to Noise Ratio
Image Rejection
Tweet
Total Harmonic Distortion
VAF
VAMST
Audio Output Level
AM IF2 Output level
Test Condition
VINRF = 74dBu; ∆VAF = - 20dB
S+N/N = 20dB
VINRF = 74dBu; ∆VAF = -10dB
VINRF = 74dBu
f1 = 1.9MHz
f2 = 22.4MHz
VINRF = 74dBu; f1 = 900KHz;
f2 = 1350KHz
VINRF = 74dBu; m = 0.3
VINRF = 74dBu; m = 0.8
VINRF = 120dBu; m = 0.3
VINRF = 74dBu
VINRF = 74dBu
Min. Typ. Max. Unit
20
dBu
31
dBu
50
dB
46.0 53.0
dB
dB
1.2
dB
0.45 1.0 %
1.73
%
0.33
%
137 167 197 mVRMS
106
dBu
AM Mixer 1
Ref: AM Test Circuit, measure input at VMIX2AMIN, output at VMIXOUT
Symbol
RINMIX1
GMIX1
IP3MIX1
CP1MIX1
Parameter
Input Resistance
Conversion Gain
3rd Order Intermodulation
Distortion Intercept Point
1dB Compression Point
Test Condition
fIN = 1MHz
fd = 1MHz; fu1 = 1.1MHz;
fu2 = 1.2MHz;
fIN = 1MHz
Min. Typ. Max. Unit
1.2
KΩ
7.5 8.5 9.5 dB
115
dBu
98.7
dBu
10/38
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